View MAX5406_341385.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-3817; Rev 0; 5/06
Audio Processor with Pushbutton Interface
General Description
The MAX5406 stereo audio processor provides a complete audio solution with volume, balance, bass, and treble controls. It features dual 32-tap logarithmic potentiometers for volume control, dual potentiometers for balance control, and linear digital potentiometers for tone control. A simple debounced pushbutton interface controls all functions. The MAX5406 advances the wiper setting once per button push. Maxim's proprietary SmartWiperTM control eliminates the need for a microcontroller (C) to increase the wiper transition rate. Holding the control input low for more than 1s advances the wiper at a rate of 4Hz for 4s and 16Hz thereafter. An integrated click/pop suppression feature eliminates the audible noise generated by the wiper's movements. The MAX5406 provides a subwoofer output that internally combines the left and right channels. An external filter capacitor allows for a customized cut-off frequency for the subwoofer output. A bass-boost mode enhances the low-frequency response of the left and right channels. An integrated bias amplifier generates the required (VDD + VSS) / 2 bias voltage, eliminating the need for external op amps for unipolar operation. The MAX5406 also features ambience control to enhance the separation of the left- and right-channel outputs for headphones and desktop speakers systems, and a pseudostereo feature that approximates stereo sound from a monophonic signal. The MAX5406 is available in a 7mm x 7mm, 48-pin TQFN package and in a 48-pin TSSOP package and is specified over the extended (-40C to +85C) temperature range.
Features
Audio Processor Including All Op Amps and Pots for Volume, Balance, Mute, Bass, Treble, Ambience, Pseudostereo, and Subwoofer 32-Tap Volume Control (2dB Steps) Small, 7mm x 7mm, 48-Pin TQFN and 48-Pin TSSOP Packages Single +2.7V to +5.5V or Dual 2.7V Supply Operation Clickless Switching and Control Mute Function to < -90dB (typ) Channel Isolation > -70dB (typ) Two Sets of Single-Ended or Differential Stereo Inputs Can Be Used for Summing/Mixing Debounced Pushbutton Interface Works with Momentary Contact Switches or Microprocessors (Ps) Low 0.2A (typ) Shutdown Supply Current Shutdown Stores All Control Settings 0.02% (typ) THD into 10k Load, 25VRMS (typ) Output Noise Internally Generated 1/2 Full-Scale Bias Voltage for Single-Ended Applications Power-On Volume Setting to -20dB Internal Passive RF Filters for Analog Inputs Prevent High Frequencies from Reaching the Speakers
MAX5406
Applications
Automotive Rear-Seat Entertainment (RSE) Desktop Speakers Portable Audio PDAs or MP3 Player Docking Stations Karaoke Machines Flat-Screen TVs
PART MAX5406EUM
Ordering Information
TEMP RANGE -40C to +85C PINPACKAGE 48 TSSOP PKG CODE U48-1 T4877-6
MAX5406ETM* -40C to +85C 48 TQFN *Future product--contact factory for availability.
Pin Configurations appear at end of data sheet.
SmartWiper is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Audio Processor with Pushbutton Interface MAX5406
ABSOLUTE MAXIMUM RATINGS
L1_H, L1_L, L2_H, L2_L to VSS .......................-0.3V to the lower of (VDD + 0.3V) or +6V R1_H, R1_L, R2_H, R2_L to VSS .......................-0.3V to the lower of (VDD + 0.3V) or +6V AMB, BALL, BALR, VOLUP, VOLDN, MUTE, SHDN, BASSDN, BASSUP, TREBDN, TREBUP to DGND .............-0.3V to the lower of (VLOGIC + 0.3V) or +6V CTL_, CTR_, CBL_, CBR_, CLS_, CRS_, CSUB, CBIAS, CMSNS, AMBLI, AMBRI, BIAS to VSS .......................-0.3V to the lower of (VDD + 0.3V) or +6V LOUT, ROUT, SUBOUT, LMR, LPR to VSS................-0.3V to the lower of (VDD + 0.3V) or +6V VDD to VSS ................................................................-0.3V to +6V VDD to VLOGIC........................................................................6V VLOGIC to DGND ......................................................-0.3V to +6V DGND to VSS ............................................................-0.3V to +6V LOUT, ROUT, SUBOUT Short Circuited to VSS .........Continuous Continuous Power Dissipation (TA = +70C) 48-Pin TQFN (derate 27.8mW/C above +70C) ........2222mW 48-Pin TSSOP (derate 16mW/C above +70C) .........1282mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-60C to +150C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = VLOGIC = +5.0V, VSS = 0, VBIAS = VCMSNS = VDD / 2, DGND = 0, ambience disabled, VAMBLI = VAMBRI = VBIAS, VR1_L = VL1_L = VR2_L = VL2_L = external VBIAS, CCSUB = 0.15F, CCLS = CCRS = 1F, CCBL = CCBR = 3.3nF, CCTL = CCTR = 4.7nF, CBIAS = 0.1F, CCBIAS = 50F (see the Typical Application Circuit), TA = TMIN to TMAX unless otherwise specified. Typical values are at TA = +25C). (Note1)
PARAMETER Signal-Inputs Input Resistance Signal-Inputs Input Capacitance RF Rejection SYMBOL RIN CIN CONDITIONS With respect to VBIAS With respect to VBIAS 2MHz to 2.4GHz two-tone test, 2/2.01MHz input to 10kHz out VDD = +5V, VSS = 0, VCM = VBIAS, gain error -0.5dB VDD = +2.7V, VSS = -2.7V, VCM = VBIAS, gain error -0.5dB VDD = +5V, VSS = 0, VBIAS = VDD / 2, VDIFF = 100mV VDD = +2.7V, VSS = -2.7V, VBIAS = 0, VDIFF = 100mV Internally generated (VCMSNS = VSS) L_ _H = R_ _H = VBIAS, L_ _L = R_ _L = open, VCMSNS = VDD (Note 2) (Note 2) (Note 2) (Note 2) (Note 2) (Note 2) (Note 2) -63 -0.5 10 -4 -4.5 RINH RINL MIN 8 16 TYP 10 20 5 20 +4 V +4.5 MAX UNITS k pF dBc
Differential Input Voltage Range
VIN
Common-Mode Input Voltage Range
VCM
VSS + 0.5V
VDD - 0.5V
V
Bias Voltage Bias-Voltage Input Current AUDIO PROCESSING FUNCTIONS Maximum Balance Difference Minimum Balance Difference Balance Resolution Maximum Volume Attenuation Minimum Volume Attenuation Volume Resolution Volume-Control Steps
VBIAS
(VDD + VSS) / 2 1
V mA
12 0 2 -62 0 2 32
14
dB dB dB
-59 +0.5
dB dB dB steps
2
_______________________________________________________________________________________
Audio Processor with Pushbutton Interface
ELECTRICAL CHARACTERISTICS (continued)
(VDD = VLOGIC = +5.0V, VSS = 0, VBIAS = VCMSNS = VDD / 2, DGND = 0, ambience disabled, VAMBLI = VAMBRI = VBIAS, VR1_L = VL1_L = VR2_L = VL2_L = external VBIAS, CCSUB = 0.15F, CCLS = CCRS = 1F, CCBL = CCBR = 3.3nF, CCTL = CCTR = 4.7nF, CBIAS = 0.1F, CCBIAS = 50F (see the Typical Application Circuit), TA = TMIN to TMAX unless otherwise specified. Typical values are at TA = +25C). (Note1)
PARAMETER Gain Matching of Input 1 to Input 2 of Each Channel Gain Matching of Left to Right Channel Bass-Boost Range Bass-Cut Range Treble-Boost Range Treble-Cut Range Bass-Boost/-Cut Steps Treble-Boost/-Cut Steps Bass End-to-End Resistance Treble End-to-End Resistance Bass Series Resistance Treble Series Resistance Mute Attenuation Total Harmonic Distortion Plus Noise Interchannel Crosstalk ROUT/LOUT OUTPUTS Maximum Load Capacitance Output-Voltage Swing Output Offset Voltage Short-Circuit Output Current Output Resistance CLOAD VOUTP-P VOOS ISC R_OUT RL = 10k, VDD = +2.7V, VSS = -2.7V VDD = +2.7V, VSS = -2.7V, volume = 0dB, RL = 10k, inputs = VBIAS Shorted to VSS ILOAD = 100A to 500A -2.3 -30 0 15 10 100 +2.3 +30 pF V mV mA RBPOT RTPOT RB RT SYMBOL CONDITIONS Volume = 0dB (Note 2) Volume = 0dB (Note 2) fBASS = 1kHz, treble = 0dB, CCB_ = open, CCT_ = open (Note 3) fBASS = 1kHz, treble = 0dB, CCB_ = open, CCT_ = open (Note 3) fTREBLE = 1kHz, bass = 0dB, CCB_ = open, CCT_ = short (Note 3) fTREBLE = 1kHz, bass = 0dB, CCB_ = open, CCT_ = short (Note 3) Max boost to max cut Max boost to max cut MIN -0.1 -0.1 10 10 10 10 14 14 15 15 21 21 116 17 40 3.5 -90 TYP MAX +0.1 +0.1 UNITS dB dB dB dB dB dB steps steps k k k k dB
MAX5406
AC PERFORMANCE (VIN = 1VP-P, RL = 10k, VDD = +2.7V, VSS = -2.7V, volume = 0dB, treble = bass = 0dB) THD+N (Notes 4, 5) L to R or R to L 0.02 -70 0.05 % dB
_______________________________________________________________________________________
3
Audio Processor with Pushbutton Interface
ELECTRICAL CHARACTERISTICS (continued)
MAX5406
(VDD = VLOGIC = +5.0V, VSS = 0, VBIAS = VCMSNS = VDD / 2, DGND = 0, ambience disabled, VAMBLI = VAMBRI = VBIAS, VR1_L = VL1_L = VR2_L = VL2_L = external VBIAS, CCSUB = 0.15F, CCLS = CCRS = 1F, CCBL = CCBR = 3.3nF, CCTL = CCTR = 4.7nF, CBIAS = 0.1F, CCBIAS = 50F (see the Typical Application Circuit), TA = TMIN to TMAX unless otherwise specified. Typical values are at TA = +25C). (Note1)
PARAMETER SYMBOL CONDITIONS fBW = 20Hz to 20kHz, VIN = VBIAS, mute on, noise measured at LOUT and ROUT (Notes 2, 4, 5) Output Noise en fBW = 20Hz to 20kHz, VIN = VBIAS, mute off, volume = 0dB, noise measured at LOUT and ROUT (Notes 2, 4, 5) Power-Supply Rejection Ratio SUBWOOFER OUTPUT Gain Highpass Filter Cutoff Frequency Internal Highpass Cutoff Resistance Lowpass Filter Cutoff Frequency Internal Lowpass Cutoff Resistance Maximum Load Capacitance Output-Voltage Swing Output Offset Voltage Short-Circuit Output Current Output Resistance RSUB CSUBLOAD VSUBOUTP-P RL = 10k, VDD = +2.7V, VSS = -2.7V VSUBOOS ISUBSC RSUBOUT VDD = +2.7V, VSS = -2.7V, volume = 0dB, RL = 10k Shorted to VSS ILOAD = 100A to 500A fBW = 20Hz to 20kHz, VIN = VBIAS, mute on, noise measured at SUBOUT (Notes 2, 4, 5) fBW = 20Hz to 20kHz, VIN = VBIAS, volume = 0dB, mute off, noise measured at SUBOUT (Notes 2, 4, 5) 100mVP-P at 217Hz on VDD 100mVP-P at 1kHz on VDD 9 -2.3 -15 0 12 10 11 VRMS 25 -70 -65 50 Figures 2a, 11a, 11b Figure 2b, 11a, 11b Figure 3 Figure 3 Figure 3 Figure 3 30 40 1 4 4 16 35 R_S (VL1_H - VL1_L ) to (VSUBOUT - VBIAS), volume = 0dB (Note 2) Volume = 0dB Figure 12 Volume = 0dB Figure 12 -6 15 13.8 100 10.6 100 +2.3 +15 dB Hz k Hz k pF V mV mA PSRR 100mVP-P at 217Hz on VDD 100mVP-P at 1kHz on VDD 25 -70 -65 35 MIN TYP 3.5 MAX 9.5 VRMS UNITS
dB
Output Noise
en
Power-Supply Rejection Ratio
PSRR
dB
PUSHBUTTON CONTACT INPUTS (MUTE, AMB, VOLUP, VOLDN, BALL, BALR, BASSUP, BASSDN, TREBUP, TREBDN) Internal Pullup Resistor Single-Pulse Input Low Time Repetitive Input Pulse Separation Time First Autoincrement Point First Autoincrement Rate Second Autoincrement Point Second Autoincrement Rate RPU tLPW tHPW tA1 fA1 tA2 fA2 k ms ms s Hz s Hz
4
_______________________________________________________________________________________
Audio Processor with Pushbutton Interface
ELECTRICAL CHARACTERISTICS (continued)
(VDD = VLOGIC = +5.0V, VSS = 0, VBIAS = VCMSNS = VDD / 2, DGND = 0, ambience disabled, VAMBLI = VAMBRI = VBIAS, VR1_L = VL1_L = VR2_L = VL2_L = external VBIAS, CCSUB = 0.15F, CCLS = CCRS = 1F, CCBL = CCBR = 3.3nF, CCTL = CCTR = 4.7nF, CBIAS = 0.1F, CCBIAS = 50F (see the Typical Application Circuit), TA = TMIN to TMAX unless otherwise specified. Typical values are at TA = +25C). (Note1)
PARAMETER Input-Voltage High Input-Voltage Low SHDN Input-Voltage High SHDN Input-Voltage Low Input Leakage Current Input Capacitance Input-Voltage High Input-Voltage Low SHDN Input-Voltage High SHDN Input-Voltage Low Input Leakage Current Input Capacitance TIMING CHARACTERISTICS Wiper Settling Time tWS Click/pop suppression inactive, Figures 2a, 11a, 11b 45 ms 5 VIH VIL VIHSHDN VILSHDN 2 0.6 5 2 0.6 5 SYMBOL VIH VIL VIHSHDN VILSHDN 3.4 0.8 5 CONDITIONS MIN 2.4 0.8 TYP MAX UNITS V V V V A pF V V V V A pF DIGITAL INPUTS (VLOGIC > 3.6V) (MUTE, AMB, VOLUP, VOLDN, BALL, BALR, BASSUP, BASSDN, TREBUP, TREBDN)
MAX5406
DIGITAL INPUTS (VLOGIC 3.6V) (MUTE, AMB, VOLUP, VOLDN, BALL, BALR, BASSUP, BASSDN, TREBUP, TREBDN)
POWER SUPPLIES (VCMSNS = VSS, internal bias enabled) Supply-Voltage Difference Positive Analog Supply Voltage Negative Analog Supply Voltage Dual-Supply Positive Supply Voltage Active Positive Supply Current VDD - VSS VDD VSS VDD VSS = -2.7V No signal, all logic inputs pulled high to VLOGIC or unconnected, SHDN = VLOGIC, RL = 10k (Note 6) No signal, all logic inputs connected to DGND or VLOGIC, VDD = +5V, VSS = 0 ISS No signal, all logic inputs connected to DGND or VLOGIC, VDD = +2.7V, VSS = -2.7V No signal, VDD = 5V, VSS = 0, all logic inputs connected to DGND or VLOGIC, SHDN = DGND No signal, VDD = +2.7V, VSS = -2.7V, all logic at DGND or VLOGIC, SHDN = DGND IDD ISS -13 +2.7 -2.7 0 +5.5 +5.5 0 +2.7 V V V V
IDD
10
13
mA
-10 mA
Active Negative Supply Current (Note 6)
-13
-10
0.2 A 0.2 50
Shutdown Supply Current (Note 6)
ISHDN
_______________________________________________________________________________________
5
Audio Processor with Pushbutton Interface MAX5406
ELECTRICAL CHARACTERISTICS (continued)
(VDD = VLOGIC = +5.0V, VSS = 0, VBIAS = VCMSNS = VDD / 2, DGND = 0, ambience disabled, VAMBLI = VAMBRI = VBIAS, VR1_L = VL1_L = VR2_L = VL2_L = external VBIAS, CCSUB = 0.15F, CCLS = CCRS = 1F, CCBL = CCBR = 3.3nF, CCTL = CCTR = 4.7nF, CBIAS = 0.1F, CCBIAS = 50F (see the Typical Application Circuit), TA = TMIN to TMAX unless otherwise specified. Typical values are at TA = +25C). (Note1)
PARAMETER Power-Up Time Wake-Up Time Logic Supply Voltage Logic Active Supply Current SYMBOL tPU tWU VLOGIC ILOGIC CONDITIONS Power first applied, _OUT = -20dB From shutdown (Note 7) DGND = 0, VLOGIC VDD No signal, one button pressed, remaining logic inputs connected to VLOGIC or unconnected No signal, all logic inputs connected to VLOGIC or unconnected, SHDN = DGND (Note 6) 0.2 +2.7 MIN TYP 1 1 VDD 150 MAX UNITS s s V A
Logic Shutdown Supply Current
2
A
Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Note 7:
All devices 100% production tested at TA = +85C. Limits over the operating temperature range are guaranteed by design. Treble = bass = 0dB. CCB_ = open, CCT_ = short, left input signal = right input signal = +2V. See Tables 3 and 4 and Figure 7. VDD = +2.7V, VSS = -2.7V. Guaranteed by design. Measured with A-weighted filter. Supply current measured while attenuator position is fixed. Set _OUT = 0dB and shutdown device SHDN = 0. tWU is the time required for _OUT to reach 0dB after SHDN goes high.
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
ATTENUATION vs. TAP POSITION
MAX5406 toc01a
ATTENUATION vs. TAP POSITION
MAX5406 toc01b
BAXANDALL CURVE
VDD = VLOGIC = 5V, VSS = 0 TREBLE = BASS
MAX5406 toc02a
0 -10 ATTENUATION (dB) -20 -30 -40 -50 -60 -70 0 4 8 12 16 20 TAP POSITION 24 28 VDD = VLOGIC = 5V, VSS = 0 VOLUP = 0dB
0 VDD = VLOGIC = 2.7V, VSS = -2.7V -10 ATTENUATION (dB) -20 -30 -40 -50 -60 -70
15 10 5 GAIN (dB) 0 -5 -10 -15
CCB_ = 10nF CCT_ = 2.2nF 10 100 1000 10,000 FREQUENCY (Hz) 100,000
32
0
4
8
12 16 20 TAP POSITION
24
28
32
6
_______________________________________________________________________________________
Audio Processor with Pushbutton Interface MAX5406
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
BAXANDALL CURVE
MAX5406 toc02b
BAXANDALL CURVE
CCB_ = 10nF CCT_ = 2.2nF VDD = VLOGIC = 5V, VSS = 0 BASS = 0dB
MAX5406 toc02c
BAXANDALL CURVE
MAX5406 toc02d
20 15 10 GAIN (dB) VDD = VLOGIC = 2.7V, VSS = -2.7V VIN = 0.5VP-P BASS = TREBLE
15 10 5 GAIN (dB) 0 -5 -10
15 10 5 GAIN (dB) 0 -5 -10 -15 -20 CCB_ = 10nF CCT_ = 2.2nF VDD = VLOGIC =2.7V, VSS = -2.7V VIN = 0.5VP-P BASS = 0dB 10 100 1000 10,000 FREQUENCY (Hz)
5 0 -5 -10 -15 -20 10 100 1000 10,000 FREQUENCY (Hz) 100,000 CCB_ = 10nF CCT_ = 2.2nF
-15 -20 10 100 1000 10,000 FREQUENCY (Hz) 100,000
100,000
BAXANDALL CURVE
MAX5406 toc02e
BAXANDALL CURVE
MAX5406 toc02f
SINGLE-SUPPLY SUBOUT FREQUENCY RESPONSE
0 DUAL INPUTS -10 GAIN (dB) -20 -30 -40 -50 -60 -70
MAX5406 toc03a
15 10 5 GAIN (dB) 0 -5 -10 -15 10 100 1000 10,000 FREQUENCY (Hz) CCB_ = 10nF CCT_ = 2.2nF VDD = VLOGIC = 5V, VSS = 0 TREBLE = 0dB
20 15 10 GAIN (dB) 5 0 -5 -10 -15 -20
CCB_ = 10nF CCT_ = 2.2nF VDD = VLOGIC = 2.7V, VSS = -2.7V VIN = 0.5VP-P TREBLE = 0dB
10
100,000
10
100
1000 10,000 FREQUENCY (Hz)
100,000
10
100
1000 10,000 FREQUENCY (Hz)
100,000
DUAL-SUPPLIES SUBOUT FREQUENCY RESPONSE
MAX5406 toc03b
LOUT FREQUENCY RESPONSE
MAX5406 toc03c
DUAL-SUPPLIES LOUT FREQUENCY RESPONSE
5 0 -5 GAIN (dB) -10 -15 -20 -25 -30 -35 VDD = VLOGIC = 2.7V, VSS = -2.7V VOLUP = 0dB
MAX5406 toc03d
10 DUAL INPUTS 0 -10 GAIN (dB) -20 -30 -40 -50 -60 10 100 1000 10,000 FREQUENCY (Hz) VDD = VLOGIC = 2.7V, VSS = -2.7V VOLUP = 0dB
10 5 0 -5 GAIN (dB) -10 -15 -20 -25 -30 -35 VDD = VLOGIC = 5V, VSS = 0 VOLUP = 0dB
10
100,000
10
100
1k 10k 100k FREQUENCY (Hz)
1M
10M
10
100
1k 10k 100k FREQUENCY (Hz)
1M
10M
_______________________________________________________________________________________
7
Audio Processor with Pushbutton Interface MAX5406
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
DUAL-SUPPLIES ROUT FREQUENCY RESPONSE
MAX5406 toco3e MAX5406 toc03f
ROUT FREQUENCY RESPONSE
5 0 -5 GAIN (dB) -10 -15 -20 -25 -30 -35 10 100 1k 10k 100k FREQUENCY (Hz) 1M 10M VDD = VLOGIC = 5V, VSS = 0 VOLUP = 0dB GAIN (dB) 10 5 0 -5 -10 -15 -20 -25 -30 -35 10
PSRR vs. FREQUENCY
0 -10 -20 PSRR (dB) -30 -40 -50 -60 -70 -80 0.1 VDD = VLOGIC = 5V, VSS = 0 100mVP-P ON VDD
MAX5406 toc4a
VDD = VLOGIC = 2.7V, VSS = -2.7V VOLUP = 0dB
100
1k 10k 100k FREQUENCY (Hz)
1M
10M
1
10 FREQUENCY (kHz)
100
1,000
PSRR vs. FREQUENCY
10 0 -10 -20 PSRR (dB) VDD = VLOGIC = 2.7V, VSS = -2.7V 100mVP-P ON POSITIVE SUPPLY
MAX5406 toc4b
PSRR vs. FREQUENCY
10 0 -10 -20 PSRR (dB) -30 -40 -50 -60 -70 -80 VDD = VLOGIC = 2.7V, VSS = -2.7V 100mVP-P ON NEGATIVE SUPPLY
MAX5406 toc4c
OUTPUT SWING vs. SUPPLY VOLTAGE
4.5 4.0 OUTPUT SWING (V) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 SINGLE-SUPPLY OPERATION VDD = VLOGIC, THD = 0.02% AT 1kHz
MAX5406 toc5a
5.0
-30 -40 -50 -60 -70 -80 -90 0.1 1 10 FREQUENCY (kHz) 100 1,000
0.1
1
10 FREQUENCY (kHz)
100
1,000
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
VDD (V)
OUTPUT SWING vs. SUPPLY VOLTAGE
MAX5406 toc5b
TOTAL SUPPLY CURRENT vs. TEMPERATURE (IDD + ILOGIC)
VDD = VLOGIC = 5V, VSS = 0 11.5 SUPPLY CURRENT (mA) 11.0 10.5 10.0 9.5 9.0 8.5 8.0 5 -40 -15 10 35 TEMPERATURE (C) 60 85 -40 INACTIVE MODE, NO BUTTON PUSHED ACTIVE MODE, ONE BUTTON PUSHED
MAX5406 toc06a
TOTAL SUPPLY CURRENT vs. TEMPERATURE (IDD + ILOGIC)
VDD = VLOGIC = 2.7V, VSS = -2.7V TOTAL SUPPLY CURRENT: IDD + ILOGIC 13 SUPPLY CURRENT (mA) ACTIVE MODE (ONE BUTTON PUSHED)
MAX5406 toc06b
5.0 4.5 4.0 OUTPUT SWING (V) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 3.0 3.5 4.0 4.5 5.0 DUAL-SUPPLY OPERATION VLOGIC = VDD, THD = 0.02% AT 1kHz
12.0
15
11 INACTIVE MODE (NO BUTTON PUSHED) 9
7
5.5
-15
(VDD - VSS) (V)
10 35 TEMPERATURE (C)
60
85
8
_______________________________________________________________________________________
Audio Processor with Pushbutton Interface MAX5406
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
WIPER SWITCHING TRANSIENT (SUPPRESSION CIRCUIT ACTIVE)
MAX5406 toc07b
WIPER SWITCHING TRANSIENT
MAX5406 toc07a
ILOGIC vs. VLOGIC
180 160 VOLUP 140 ILOGIC (A) 120 100 80 60 OUTPUT 40 20 0 VDD = 5.5V, VSS = 0 ACTIVE MODE (ONE BUTTON PUSHED) 2.7 3.1 3.5 3.9 4.3 VLOGIC (V) 4.7 5.1 5.5 TA = +25C TA = +85C TA = -40C
MAX5406 toc08a
DC LEVEL AT THE INPUT OUTPUT
5VP-P SINE WAVE BETWEEN L1_H AND L1_L
200
10s/div
4ms/div
ILOGIC vs. VLOGIC
MAX5406 toc08b
THD PLUS NOISE vs. FREQUENCY
MAX5406 toc09a
THD PLUS NOISE vs. FREQUENCY
VDD = VLOGIC = 2.7V, VSS = -2.7 VIN = 4.6VP-P
MAX5406 toc09b
1 VDD = VLOGIC = 5V, VSS = GND VIN = 4.6VP-P
240 220 200 180 160 140 120 100 80 60 40 20 0 2.7
0.1
VDD = 5.5V, VSS = 0 INACTIVE MODE (NO BUTTON PUSHED)
THD+N (%)
TA = -40C
0.1
ILOGIC (nA)
THD+N (%)
RL = 10k
TA = +25C
RL = 10k
0.01 NO LOAD TA = +85C 0.001 3.1 3.5 3.9 4.3 VLOGIC (V) 4.7 5.1 5.5 0.01 0.1 1 FREQUENCY (kHz) 10 100 0.01 0.01 0.1 1 FREQUENCY (Hz) 10 100 NO LOAD
CROSSTALK vs. FREQUENCY
0 -10 -20 CROSSTALK (dB) VDD = VLOGIC = 5V, VSS = 0, VIN = 1VP-P, RL = 10k
CROSSTALK vs. FREQUENCY
0 -10 -20 CROSSTALK (dB) -30 -40 -50 -60 -70 -80
MAX5406 toc10b
TOTAL SUPPLY CURRENT vs. SUPPLY VOLTAGE (IDD + ILOGIC)
11.5 SUPPLY CURRENT (mA) 11.0 10.5 10.0 9.5 9.0 8.5 8.0 2.7 3.1 3.5 3.9 4.3 4.7 SUPPLY VOLTAGE (V) 5.1 5.5 TA = -40C TA = +85C VDD = VLOGIC = 5V, VSS = 0 ACTIVE MODE, ONE BUTTON PUSHED TA = +25C
MAX5406 toc11a
MAX5406 toc10a
12.0
VDD = 2.7V, VSS = -2.7V, VLOGIC = 2.5V, VIN = 1VP-P, RL = 10k
-30 -40 -50 -60 -70 -80 -90 10 100 1k 10k 100k 1M FREQUENCY (Hz)
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
_______________________________________________________________________________________
9
Audio Processor with Pushbutton Interface MAX5406
Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
TOTAL SUPPLY CURRENT vs. SUPPLY VOLTAGE (IDD + ILOGIC)
MAX5406 toc11b
LOUT NOISE vs. FREQUENCY
1.9 1.7 1.5 NOISE (VRMS/Hz) 1.3 1.1 0.9 0.7 0.5 0.3 0.1 -0.1 MUTE ON MUTE OFF VDD = VLOGIC = 2.7V, VSS = -2.7V
MAX5406 toc12a
12.0 11.5 SUPPLY CURRENT (mA) 11.0 10.5 10.0 9.5 9.0 8.5 8.0 2.7 3.1 3.5 3.9 4.3 4.7 SUPPLY VOLTAGE (V) 5.1 TA = +85C TA = -40C TA = +25C VDD = VLOGIC = 5V, VSS = 0 INACTIVE MODE, NO BUTTON PUSHED
5.5
0.01
0.1
1 FREQUENCY (kHz)
10
100
ROUT NOISE vs. FREQUENCY
MAX5406 toc12b
SUBOUT NOISE vs. FREQUENCY
1.8 1.6 NOISE (VRMS/Hz) 1.4 1.2 1 0.8 0.6 0.4 0.2 0 VDD = VLOGIC = 2.7V, VSS = -2.7V
MAX5406 toc12c
1.9 1.7 1.5 NOISE (VRMS/Hz) 1.3 1.1 0.9 0.7 0.5 0.3 0.1 -0.1
2
VDD = VLOGIC = 2.7V, VSS = -2.7V
MUTE ON
MUTE OFF
0.01
0.1
1 FREQUENCY (kHz)
10
100
0.01
0.1
1 FREQUENCY (kHz)
10
100
INPUT RF REJECTION
10kHz OUTPUT AMPLITUDE (f2-f1) = 10kHz(dBm) -10 -30 -50 -70 -90 -110 1 10 100 1000 10000 f1 FREQUENCY (MHz) VOLUME = 0dB VDD = 2.7V, VSS = -2.7V INPUT = 200mVP-P AT L1_H
MAX5406 toc13
10
______________________________________________________________________________________
Audio Processor with Pushbutton Interface
Pin Description
PIN TSSOP 1 2 3 4 5 6 7 TQFN 43 44 45 46 47 48 1 NAME CBIAS VSS L1_H L1_L L2_L L2_H LMR FUNCTION Bypass Capacitor Connection Point to Internally Generated Bias. Bypass CBIAS with a 50F capacitor to system analog ground. Negative Power-Supply Input. Bypass with a 0.1F capacitor to system analog ground. Left-Channel 1 High Terminal Input. Connect the source between L1_H and L1_L for differential signals. Connect the source to L1_H and tie L1_L to BIAS for single-ended signals. Left-Channel 1 Low Terminal Input. Connect the source between L1_H and L1_L for differential signals. Connect L1_L to BIAS for single-ended signals. Left-Channel 2 Low Terminal Input. Connect the source between L2_H and L2_L for differential signals. Connect L2_L to BIAS for single-ended signals. Left-Channel 2 High Terminal Input. Connect the source between L2_H and L2_L for differential signals. Connect the source to L2_H and tie L2_L to BIAS for single-ended signals. Left Minus Right Output Signal. LMR output provides a signal that is the difference of left and right input signals. See the Ambience Control section for more details. Ambience Left-Channel Input. AMBLI provides the proper ambient effect at LOUT based on the transfer function implemented between LMR and AMBLI. See the Ambience Control section for more details. Left-Channel Treble Tone Control Capacitor Terminal 1. Connect a capacitor between CTL1 and CTL2 to set the treble cutoff frequency. See the Tone Control section for more details. Left-Channel Treble Tone Control Capacitor Terminal 2. Connect a capacitor between CTL2 and CTL1 to set the treble cutoff frequency. See the Tone Control section for more details. Left-Channel Bass Tone Control Capacitor Terminal 1. Connect a capacitor between CBL1 and CBL2 to set the bass cutoff frequency. See the Tone Control section for more details. Left-Channel Bass Tone Control Capacitor Terminal 2. Connect a capacitor between CBL2 and CBL1 to set the bass cutoff frequency. See the Tone Control section for more details. Left-Channel Output Subwoofer Left-Channel Highpass Filter Capacitor Negative Terminal. Connect a capacitor between CLSN and CLSP to set the highpass cutoff frequency at SUBOUT. See the Subwoofer Ouput section for more details. Subwoofer Left-Channel Highpass Filter Capacitor Positive Terminal. Connect a capacitor between CLSP and CLSN to set the highpass filter cutoff frequency at SUBOUT. See the Subwoofer Ouput section for more details. Subwoofer Output. Connect a capacitor from SUBOUT to CSUB to set the lowpass filter cutoff frequency at SUBOUT. See the Subwoofer Ouput section for more details. Subwoofer Lowpass Filter Capacitor Terminal. Connect a filter capacitor between CSUB and SUBOUT to set the lowpass filter cutoff frequency. See the Subwoofer Ouput section for more details. Internally Connected. Connect to DGND.
MAX5406
8
2
AMBLI
9 10 11 12 13 14
3 4 5 6 7 8
CTL1 CTL2 CBL1 CBL2 LOUT CLSN
15
9
CLSP
16 17 18, 32
10 11 12, 26
SUBOUT CSUB I.C.
______________________________________________________________________________________
11
Audio Processor with Pushbutton Interface MAX5406
Pin Description (continued)
PIN TSSOP 19 TQFN 13 NAME FUNCTION Active-Low Mute Control Input. Toggles state between muted and not muted. When in the mute state, all wipers are moved to the low end of the volume potentiometers. The last state is restored when MUTE is toggled again. The power-on state is not muted. MUTE is internally pulled up with 50k to VLOGIC. Active-Low Downward Volume Control Input. Press VOLDN to decrease the volume. This simultaneously moves left and right volume wipers towards higher attenuation. VOLDN is internally pulled up with 50k to VLOGIC. Active-Low Upward Volume Control Input. Press VOLUP to increase the volume. This simultaneously moves the left and right volume wipers towards the the lower attenuation. VOLUP is internally pulled up with 50k to VLOGIC. Active-Low Left Balance Control Input. Press BALL to move the balance towards the left channel. BALL is internally pulled up with 50k to VLOGIC. Active-Low Right Balance Control Input. Press BALR to move the balance towards the right channel. BALR is internally pulled up with 50k to VLOGIC. Digital Ground Digital Power-Supply Input. Bypass with 0.1F to DGND.
MUTE
20
14
VOLDN
21
15
VOLUP
22 23 24 25
16 17 18 19
BALL BALR DGND VLOGIC
26
20
27
21
Active-Low Shutdown Control Input. In shutdown mode, the MAX5406 stores every wiper's last position. Each wiper moves to the highest attenuation level of its corresponding potentiometer. SHDN Terminating shutdown mode restores every wiper to its previous setting. In shutdown, the MAX5406 does not acknowledge any pushbutton command. Active-Low Downward Bass Control Input. Press BASSDN to decrease bass boost. Bass boost emphasizes the signal's low-frequency components. BASSDN is internally pulled up with 50k to BASSDN VLOGIC. To implement a bass-boost button, connect BASSDN to BASSUP. Presses then toggle the state between flat and full bass boost on each button press. Active-Low Upward Bass Control Input. Press BASSUP to increase bass boost. Bass boost emphasizes the signal's low frequency components. BASSUP is internally pulled up with 50k to VLOGIC. To implement a bass-boost button, connect BASSUP to BASSDN. Presses then toggle the state between flat and full bass boost on each button press.
28
22
BASSUP
29
23
Active-Low Downward Treble Control Input. Press TREBDN to decrease the treble boost. Treble TREBDN boost emphasizes the signal's high-frequency components. TREBDN is internally pulled up with 50k to VLOGIC. TREBUP AMB Active-Low Upward Treble Control Input. Press TREBUP to increase the treble boost. Treble boost emphasizes the signal's high-frequency components. TREBUP is internally pulled up with 50k to VLOGIC. Active-Low Ambience Switch Control Input. Drive AMB low to toggle on/off the ambience function. AMB is internally pulled up with 50k to VLOGIC. Subwoofer Right-Channel Highpass Filter Capacitor Negative Terminal. Connect a capacitor between CRSN and CRSP to set the highpass cutoff frequency at SUBOUT. See the Subwoofer Ouput section for more details. Subwoofer Right-Channel Highpass Filter Capacitor Positive Terminal. Connect a capacitor between CRSP and CRSN to set the highpass cutoff frequency at SUBOUT. See the Subwoofer Ouput section for more details. Right-Channel Output
30 31
24 25
33
27
CRSN
34 35
28 29
CRSP ROUT
12
______________________________________________________________________________________
Audio Processor with Pushbutton Interface
Pin Description (continued)
PIN TSSOP 36 37 38 39 40 41 42 43 44 45 46 47 TQFN 30 31 32 33 34 35 36 37 38 39 40 41 NAME CBR2 CBR1 CTR2 CTR1 AMBRI LPR VDD R2_H R2_L R1_L R1_H CMSNS FUNCTION Right-Channel Bass Tone Control Capacitor Terminal 2. Connect a nonpolorized capacitor between CBR2 and CBR1 to set the bass cutoff frequency. See the Tone Control section for more details. Right-Channel Bass Tone Control Capacitor Terminal 1. Connect a capacitor between CBR1 and CBR2 to set the bass cutoff frequency. See the Tone Control section for more detail. Right-Channel Treble Tone Control Capacitor Terminal 2. Connect a capacitor between CTR2 and CTR1 to set the treble cutoff frequency. See the Tone Control section for more details. Right-Channel Treble Tone Control Capacitor Terminal 1. Connect a capacitor between CTR1 and CTR2 to set the treble cutoff frequency. See the Tone Control section for more details. Ambience Right-Channel Input. AMBRI provides the proper ambient effect at ROUT based on the gain between LPR and AMBRI. See the Ambience Control section for more details. Left Plus Right Output Signal. LPR output provides a signal that is a combination of the left and right input signals. See the Ambience Control section for more details. Positive Analog Supply Voltage. Bypass with a 0.1F capacitor to system analog ground. Right-Channel High Terminal 2. Connect the source between R2_H and R2_L for differential signal. Connect the source to R2_H and tie R2_L to BIAS for single-ended signals. Right-Channel Low Terminal 2. Connect the source between R2_H and R2_L for differential signal. Connect R2_L to BIAS for single-ended signals. Right-Channel Low Terminal 1. Connect the source between R1_H and R1_L for differential signal. Connect R1_L to BIAS for single-ended signals. Right-Channel High Terminal 1. Connect the source between R1_H and R1_L for differential signal. Connect the source to R1_H and tie R1_L to BIAS for single-ended signals. Common-Mode Voltage Sense. Connect to VDD to disable the internal bias generator and drive BIAS with external source to set output DC level. Internally Generated Bias Voltage. Connect CMSNS to VSS to enable the internally generated VBIAS. VBIAS = (VDD + VSS) / 2. Connect a 0.1F capacitor between BIAS and system analog ground as close to the device as possible. Do not use BIAS to drive external circuitry.
MAX5406
48
42
BIAS
______________________________________________________________________________________
13
Audio Processor with Pushbutton Interface MAX5406
LMR AMBLI
VDD
CBL1
CBL2
CTL1
CTL2
L1_H RF FILTER L1_L L2_H RF FILTER L2_L CBIAS CMSNS BIAS BIAS GENERATOR
LEFT AMBIENCE SWITCH
LEFT LOG POT CONTROLLED BY AMB BASS/TREBLE OUTPUT STAGE SEE FIGURE 7 LOUT
CLSP
CLSN
RLS R1_H RF FILTER R1_L R2_H R2_L RF FILTER RIGHT AMBIENCE SWITCH CONTROLLED BY AMB RRS SUBOUT
RSUB CSUB CRSN
CRSP BASS/TREBLE OUTPUT STAGE SEE FIGURE 7
MAX5406
RIGHT LOG POT
ROUT
DIGITAL INTERFACE
LPR DGND VSS
SHDN AMB
BALR VOLUP BASSUP TREBUP
CBR1
CBR2
CTR1
CTR2
AMBRI VLOGIC MUTE BALL VOLDN BASSDN TREBDN
Figure 1. Block Diagram
Detailed Description
The MAX5406 implements dual logarithmic potentiometers to control volume, dual potentiometers to control balance, and dual linear digital potentiometers to set the tone (Figure 1). A debounced pushbutton interface is provided to control the audio-processor settings. The MAX5406 provides differential buffered inputs with RF
14
filters to maximize noise reduction and a mixer to produce an equal amount of left and right input channels. In addition to a differential output, the MAX5406 provides a monophonic output at SUBOUT for systems with a subwoofer.
______________________________________________________________________________________
Audio Processor with Pushbutton Interface MAX5406
Table 1. Wiper Action vs. Pushbutton Contact Duration
CONTACT DURATION t < tLPW tLPW t 1s 1s t < 4s t 4s WIPER ACTION No motion (debouncing) (Figures 2a and 2b) Wiper changes position once (Figures 2a and 2b) Wiper changes position at a rate of 4Hz (Figure 3) Wiper changes position at a rate of 16Hz (Figure 3)
Table 2. Attenuator Position For Volume Potentiometers
POSITION 0 1 2 ..... 10 ( Power-on state) ..... 30 31 32 (Mute) ATTENUATION (dB) 0 2 4 ..... 20 ..... 60 62 > 90
Up/Down Interface
The MAX5406 features independent control inputs for volume, balance, ambience, and tone control. All control inputs are internally debounced for use with momentary contact SPST switches. All switch inputs are pulled up to VLOGIC through 50k resistors. The wiper setting advances once per button press held for up to 1s (see Figures 2a and 2b). Maxim's SmartWiper control circuitry allows the wiper to advance at a rate of 4Hz when an input is held low from 1s up to 4s, and at a rate of 16Hz if the contact is maintained for greater than 4s without the need of a P (see Figure 3 and Table 1). The MAX5406 ignores multiple buttons being pressed. A P can also be used to control the MAX5406. Volume Control The MAX5406 implements dual logarithmic potentiometers for volume control that change the sound level by 2dB per button push (see Table 2). In volume-control mode, the MAX5406's wipers move up and down together (see Figure 4). The balance is unaffected (see the Balance Control section). Left and right balance settings are maintained when adjusting the volume. Balance Control In balance-control mode, the MAX5406 uses dual potentiometers to control balance for the left and right channels. Pressing BALR increases the right channel wiper by 1dB and decreases the left channel by 1dB. This causes the right channel to sound louder than the left channel by 2dB. The overall volume remains constant when adjusting the balance (Figure 5).
Volume and Balance Interaction Volume and balance operation is simple. However, there are some interactions that occur at the extreme wiper positions. These interactions are described in this section of the data sheet. When the volume setting is at the maximum level, the first command to move the balance toward the left channel forces the right channel to decrease by 1dB. Subsequent pressing of BALL causes the right channel to decrease by 2dB. At this position, shown in the right column of Figure 6a, the left-channel volume is maximum, but the actual separation between L and R is 3dB. At this position, pressing VOLDN restores the actual balance setting only after VOLDN is pressed at least half as many times as BALL was (previously) pressed (shown in the middle and right column of Figure 6b) to increase the right-channel balance. The volume and balance interaction is similar when volume setting is at the minimum level.
Tone Control
The MAX5406 implements a linear potentiometer to control the bass and treble over a range of 10dB using the recommended component values. Note that the actual response achieved is determined by the values of both external and internal components and the design equations are somewhat interactive. Use the values shown in the Electrical Characteristics as a good starting point for choosing component values. These components yield shelf turnovers at 100Hz (bass) and 10kHz (treble) with a total 10dB of boost at 100Hz and 10kHz. The shoulder or flat portion of the response is centered on 1kHz. The circuit in Figure 7 shows the internal structure of the tone-control system should modification to the
15
______________________________________________________________________________________
Audio Processor with Pushbutton Interface MAX5406
tWS VOLUP tLPW
WIPER MOTION
Figure 2a. Single-Pulse Input
tLPW VOLUP
tHPW
VIH VIL
WIPER MOTION
Figure 2b. Repetitive Input-Pulse Separation Time
tA2 tA1 VOLUP
VIH VIL
WIPER MOTION
1 fA1
1 fA1
1 fA2
1 fA2
1 fA2
1 fA2
Figure 3. Accelerated Wiper Motion 16 ______________________________________________________________________________________
Audio Processor with Pushbutton Interface MAX5406
BALANCE SEPARATION MAINTAINED L R PRESS VOLUP TWICE L R PRESS VOLDN ONCE L R
Figure 4. Basic Volume-Control Operation
VOLUME LEVEL IS SET L R 1dB PER STEP PRESS BALR ONCE
L
R 1dB PER STEP PRESS BALR ONCE
L
R
1dB PER STEP
Figure 5. Basic Balance-Control Operation
VOLUME LEVEL IS AT MAXIMUM L R 1dB PER STEP PRESS BALL ONCE
L
R 2dB PER STEP PRESS BALL AGAIN
L
R
a) 1dB PER STEP
TO 6b
L
R 2dB PER STEP PRESS VOLDN ONCE
L
R 2dB PER STEP PRESS VOLDN ONCE
BALANCE COMPENSATION ENDS L R
b) 2dB PER STEP FROM 6a
Figure 6. Volume and Balance Interaction
response curve be desired. A combination of internal resistors and external capacitors determine the response of the circuit. Use the following equations to calculate the external capacitor values for the desired 3dB frequencies: fBASS(3dB) = 1 2 x RBPOT x CB _
where R BPOT , nominally 116k, is the bass potentiometer (see Figure 7). f TREBLE(3dB) = 1 2 x R T x C T _
where RT is nominally 3.5k (see Figure 7).
______________________________________________________________________________________
17
Audio Processor with Pushbutton Interface MAX5406
C_SP
CB_ CB_1 40k 116k CB_2 40k
+1
+1
-1
BUFFER INPUT
BASS POT
LMR +2
CT_1 CT_ TREBLE POT CT_2 TO BIAS _OUT
AMBLI
AMBRI
Figure 8. Matrix Surround Configuration
3.5k
17k
3.5k
+1
+1
-1
Figure 7. Bass/Treble Output Stage
LMR
Alternatively, the following formulas can be used to calculate and design for the bass and treble turnover frequencies: fBASS( TURNOVER) = 1 2 x RB x CB _
AMBIENCE NETWORK
AMBLI
AMBRI
Figure 9. Ambience Filter
+1
+1
-1
where RB is nominally 40k (see Figure 7). f TREBLE( TURNOVER) = 1 2 x (R T + RB ) x C T _
LPR PSEUDOSTEREO NETWORK AMBLI AMBRI
Figure 10. Pseudostereo Filter
Tables 3 and 4 show the effects of the external bass and treble capacitance on the maximum output attentuation.
Table 3. Effect of Base Tone Control Capacitor (CB_) on Bass Boost/Bass Cut at 100Hz
CB_ (nF) 0.00 0.47 1.80 2.20 2.70 3.30 4.70 6.80 8.20 CUT (dB) -11.79 -11.25 -11.05 -10.95 -10.85 -10.60 -10.57 -10.10 -9.66 BOOST (dB) 11.81 11.26 11.08 10.96 10.86 10.62 10.55 10.15 9.66
Table 4. Effect of Treble Tone Control Capacitor (CT_) on Treble Boost/Treble Cut at 10kHz
CT_ (nF) 0.47 1.80 2.20 2.70 3.30 4.70 6.80 8.20 Open CUT (dB) -7.80 -12.55 -12.89 -13.15 -13.33 -13.55 -13.59 -13.61 -13.79 BOOST (dB) 7.66 12.58 12.95 13.18 13.34 13.58 13.61 13.63 13.75
18
______________________________________________________________________________________
Audio Processor with Pushbutton Interface MAX5406
SWITCH SWITCH CONTACT CONTACT IS BOUNCING IS STABLE SWITCH CONTACT IS BOUNCING
PUSHBUTTON PRESSED 1
READY TO ACCEPT ANOTHER BUTTON PRESS
INPUT ACCEPTED 0 tHPW tLPW tWS
WAIT FOR DEBOUNCE BY FIRST ZERO WAITING FOR CROSSING OR STABLE LOW, TIMEOUT, tWS tLPW
DEBOUNCE BY WAITING FOR STABLE HIGH, tHPW
L1_H
L1_L
WIPER MOVES HERE (tLPW + tWS)
Figure 11a. Wiper Transition Timing Diagram (No Zero Crossing Detected)
Ambience Control
Use the ambience function for boom boxes, headphones, desktop speakers, or other audio products where the speakers are physically close together. A stereo signal is designed to be played over speakers that have a wide physical separation. The ears and brain combine the sound from these two sources to create a perception of sounds distributed in space. In the case of headphones, this wide physical separation does not exist, resulting in the sound apparently coming from somewhere inside the head. A similar situation exists when the speakers are not widely separated, for example when they are located on a desk or inside a
single enclosure. One way to compensate for this is to increase the apparent separation of the L and R signals arithmetically. The L and R signals can be modeled as a channel-specific component added to a monocomponent. To emphasize the channel-specific component, one needs to remove the opposite channel-specific component from the monocomponent. This function is accomplished with circuitry inside the MAX5406 and external network. Control the ambience effect with the AMB button that toggles between wide (full effect) and normal (no ambience effect). Use the following equations for matrix surround (fixed ambience):
______________________________________________________________________________________
19
Audio Processor with Pushbutton Interface MAX5406
SWITCH SWITCH CONTACT CONTACT IS BOUNCING IS STABLE SWITCH CONTACT IS BOUNCING
PUSHBUTTON PRESSED 1
READY TO ACCEPT ANOTHER BUTTON PRESS
INPUT ACCEPTED 0 tHPW tLPW tWS
WAIT FOR DEBOUNCE BY FIRST ZERO WAITING FOR CROSSING, tWS STABLE LOW, tIPW
DEBOUNCE BY WAITING FOR STABLE HIGH, tHPW
WIPER MOVES HERE
WIPER MOTION
Figure 11b. Wiper Transition Timing Diagram (Zero Crossing Detected)
(LIN - RIN ) 4 (LIN - RIN ) ROUT = RIN - FR(S) x 4 LOUT = LIN + FL(S) x L -R where IN IN is the signal at LMR. 4 When FL(S) and FR(S) = 2 (LMR, AMBLI, and AMBRI are connected with the multiplier network of Figure 8), the equations become:
3 1 LIN - RIN 2 2 3 1 ROUT = RIN - LIN 2 2 LOUT = Use a passive filter network as shown in Figure 9 to filter and delay the LMR signal in more advanced applications.
20
______________________________________________________________________________________
Audio Processor with Pushbutton Interface
Pseudostereo
Pseudostereo creates a sound approximating stereo from a monophonic signal. Use the equations for pseudostereo response calculations: (LIN + RIN ) 4 (LIN + RIN ) ROUT = RIN - FR(S) x 4 LOUT = LIN + FL(S) x L +R where IN IN are the signals at LPR. 4 Connect a pseudostereo network (FL(S) and FR(S)) as shown in Figure 10 to filter and delay the LPR signal and create the pseudo signal.
LEFT CHANNEL INPUT CLSP CCLS CLSN RLS VBIAS SUBOUT
MAX5406
RRS
RSUB
CCSUB
CSUB
CRSN RIGHT CHANNEL INPUT CCRS CRSP
Click/Pop Suppression
The click/pop suppression feature reduces the audible noise (clicks and pops) that results from wiper transitions. The MAX5406 minimizes this noise by allowing the wiper position changes only when the potential across the pot is zero. Thus, the wiper changes position only when the voltage at L_ is the same as the voltage at the corresponding H_. Each wiper has its own suppression and timeout circuitry (see Figure 11a). The MAX5406 changes wiper position after 32ms or when high = low, whichever occurs first (see Figure 11b).
Figure 12. Subwoofer Output Stage
MUTE is internally pulled high with a 50k resistor to VLOGIC.
Multiple Button Pushes
The MAX5406 ignores simultaneous presses of two or more buttons. Pushing more than one button at the same time does not change the state of the wipers. Additionally, further key presses are ignored for 50ms after all keys have been released. The MAX5406 does not respond to any logic input until the blocking period ends.
Power-On Reset
The MAX5406 initiates power-on reset when V LOGIC falls below 2.2V and returns to normal operation when VLOGIC = +2.7V. A power-on reset places the volume in the mute (-90dB) state and volume wipers gradually move to -20dB over a period of 0.7s in 2dB steps if no zero-crossing event is detected. All other controls remain in the 0dB position.
Bias Generator
The MAX5406 generates a midrail, (VDD + VSS) / 2 bias voltage, for use with the input amplifiers. For normal single-supply operation and single-ended signals, connect R1_L, L1_L, R2_L, and L2_L to VBIAS and VSS to ground. Enable the VBIAS generator by connecting CMSNS to VSS or leave CMSNS unconnected. Disable the VBIAS generator by forcing CMSNS to VDD. For proper operation, do not use VBIAS to power other circuitry.
Shutdown (SHDN)
The MAX5406 stores the current wiper setting of each potentiometer in shutdown mode. The wipers move to the mute position to minimize the signal out of LOUT and ROUT. Returning from shutdown mode restores all wipers to their previous settings. Button presses in shutdown are ignored.
Mute Function (MUTE)
The MAX5406 features a mute function that sets the volume typically 90dB attenuation relative to full scale. Successive pulses on MUTE toggle its setting. Activating the mute function forces all wipers to the low side of the potentiometer chain. Deactivating the mute function returns the wipers to their previous settings.
______________________________________________________________________________________
21
Audio Processor with Pushbutton Interface MAX5406
Subwoofer Output
The subwoofer output of the MAX5406 combines and filters the left and right inputs for output to a subwoofer. Choose the capacitor values to set the bandpass filter to frequencies between 15Hz and 100Hz. Figure 12 shows the subwoofer output stage configuration. The subwoofer output is a monophonic signal produced by adding the left and the right input signals. The amplifier of the subwoofer output stage produces a bandpass response. Use the following formulas to determine the cutoff frequencies for the bandpass filter: fHIGHPASS = fLOWPASS = 1 2 x x R _ S x CC _ S 1 2 x x RCSUB x CCSUB
Applications Information
Bass Boost
Some simple products may not need a variable bass tone control. It may be desirable for such products to have a bass-boost pushbutton. Tie BASSUP and BASSDN together to provide a bass-boost feature. When tied together, the bass boost is toggled between 0dB and maximum by pressing BASSUP or BASSDN.
Unequal Source Levels
Audio sources input to the MAX5406 may not have the same full-scale voltage swings. Use a resistor in series with the higher voltage swing input source to reduce the gain for that input. For example, to reduce the gain by half, add a 10k resistor in series with L1_H and R1_H, and a 20k in series with L1_L and R1_L.
where R_S is RLS or RRS and has the nominal value of 13.8k, RCSUB has the nominal value of 10.6k, and CC_S is CCLS or CCRS. The external capacitors are as shown in Figure 12.
Chip Information
PROCESS: BiCMOS
22
______________________________________________________________________________________
Audio Processor with Pushbutton Interface
Pin Configurations
TOP VIEW
CBIAS VSS L1_H L1_L L2_L L2_H LMR AMBLI CTL1 CTL2 CBL1 CBL2 LOUT CLSN CLSP SUBOUT CSUB I.C. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 48 47 46 BIAS CMSNS R1_H
MAX5406
AMBRI CTR1
44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
R2_L R2_H VDD LPR AMBRI CTR1 CTR2 CBR1 CBR2 ROUT CRSP CRSN I.C. AMB TREBUP TREBDN BASSUP BASSDN SHDN VLOGIC
36 35 34 33 32 31 30 29 28 27 26 25
VDD LPR
MAX5406
45
R1_L
CTR2
TOP VIEW
CRSP CRSN I.C. AMB
CBR1 CBR2 ROUT
R2_H R2_L R1_L R1_H CMSNS BIAS CBIAS VSS L1_H L1_L L2_L L2_H
37 38 39 40 41 42 43 44 45 46 47 48 1 2 3 4 5 6 7 8 9 10 11 12
24 23 22 21 20 19
TREBUP TREBDN BASSUP BASSDN SHDN VLOGIC DGND BALR BALL VOLUP VOLDN MUTE
MAX5406
18 17 16 15 14
13
LOUT CLSN CLSP SUBOUT CSUB
LMR AMBLI CTL1 CTL2 CBL1 CBL2
MUTE 19 VOLDN 20 VOLUP 21 BALL 22 BALR 23 DGND 24
TQFN
TSSOP
______________________________________________________________________________________
I.C.
23
Audio Processor with Pushbutton Interface MAX5406
Typical Application Circuit
CBIAS
VDD
X2
(
AMBLI CBIAS
VDD + VSS 2 BIAS
)
VSS CMSNS VDD
X2
CELL PHONE, MP3, OR ACCESSORY CONNECTORS
STEREO IN1
LMR L1_H R1_H MUTE AMB
LPR AMBRI LOUT
MAX9761
BTL LEFT SPEAKER RIGHT SPEAKER VDD
ROUT VOLDN
BTL
VLOGIC DGND CCTR SHDN CTR1 CTR2 CTL1 CCTL CCSUB STEREO IN2 (AUX) CTL2 CSUB SUBOUT L2_H R2_H
VOLUP
MAX5406
BALL BALR TREBDN TREBUP BASSDN BASSUP LEFT SENSE RIGHT
STEREO HEADPHONE JACK
DGND
VSS CBR1 CBR2 CBL1 CBL2 CRSP CRSN CLSP CLSN DGND VLOGIC * +2.7V TO VDD
CCBR
CCBL
CCRS
CCLS
*OPTIONAL TYPICAL APPLICATION CIRCUIT SHOWS MAX5406 INTERNAL BIAS VOLTAGE OPERATION AND AUXILLIARY INPUT MIXING.
24
______________________________________________________________________________________
Audio Processor with Pushbutton Interface
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
MAX5406
E E/2
DETAIL A
(NE-1) X e
k e D/2
D
(ND-1) X e
C L
D2
D2/2
b L E2/2 DETAIL B e L k
C L
E2
C L
C L
L1
L e e
L
A1
A2
A
PACKAGE OUTLINE 32, 44, 48, 56L THIN QFN, 7x7x0.8mm
21-0144
E
1
2
PACKAGE OUTLINE 32, 44, 48, 56L THIN QFN, 7x7x0.8mm
21-0144
E
2
2
______________________________________________________________________________________
32, 44, 48L QFN.EPS
25
Audio Processor with Pushbutton Interface MAX5406
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
N
MARKING
AAA A
E H
123
TOP VIEW
BOTTOM VIEW
SEE DETAIL A
b A1 A2 e D
SEATING PLANE
A
C L
c
END VIEW
SIDE VIEW
( )
PARTING LINE
b b1
WITH PLATING
0.25 L
DETAIL A
c1
BASE METAL
c
NOTES: 1. DIMENSIONS D & E ARE REFERENCE DATUMS AND DO NOT INCLUDE MOLD FLASH. 2. MOLD FLASH OR PROTRUSIONS NOT TO EXCEED 0.15MM ON D SIDE, AND 0.25MM ON E SIDE. 3. CONTROLLING DIMENSION: MILLIMETERS. 4. THIS PART IS COMPLIANT WITH JEDEC SPECIFICATION MO-153, VARIATIONS, ED (48L), EE (56L). 5. "N" REFERS TO NUMBER OF LEADS. 6. THE LEAD TIPS MUST LIE WITHIN A SPECIFIED ZONE. THIS TOLERANCE ZONE IS DEFINED BY TWO PARALLEL PLANES. ONE PLANE IS THE SEATING PLANE, DATUM (-C-), THE OTHER PLANE IS AT THE SPECIFIED DISTANCE FROM (-C-) IN THE DIRECTION INDICATED. 7. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY. 8. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.
SECTION C-C
PACKAGE OUTLINE, 48 & 56L TSSOP, 6.1mm BODY
21-0155
C
1 1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
26 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
Boblet
48L TSSOP.EPS

▲Up To Search▲

Price & Availability of MAX5406

	To Download MAX5406 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .