View AN12941A_1150147.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

ICs for Audio Common Use
AN12941A
Audio power IC for notebook PC
Overview
The AN12941A is an amplifier IC for stereo speakers which can output 1 W by 8 or 2 W by 4 . The AGC circuit is built-in to prevent the resonance or the vibration by the speaker's energy and the clipping distortion what is called "broken up sound." of the speakers. Also, to reduce power consumption, AN12941A has a built-in function which automatically detects the input signal and can automatically enter power save mode when there is no signal.
14.000.10 (6.90) (5.45) 56 29 (2.25) (3.70) 6.100.10 8.100.20 Seating plane (1.00)
0.150.05
Area of no resin flash
Unit: mm
0.10
Features
Speaker amplifier is 1 W x 2-channel: 8 , VCC = 5 V or 2 W x 2-channel: 4 , VCC = 5 V Built-in AGC circuit Prevention of the resonance or the vibration by the speaker's energy and the clipping distortion of the speaker by AGC at excessive input signal (with AGC on/off switch). Built-in automatic power saving function It detects input signals and switches on/off (with the on/off switch for the automatic power saving). Operating supply voltage: VCC 3.0 V to 5.5 V/ VCC_SP 3.0 V to 5.5 V
(0.25)
0.50
0.200.05 0.10 M Seating plane
0.100.10
(1.00) 1.20 max.
1
28
0 to 8 0.500.10
HSOP056-P-0300A (Lead-free package)
Applications
Notebook PC, LCD monitor with speaker
Block Diagram
Signal automatic detection SW Audio signal detection sensitivity SW SP power save SW
Main signal mute SW
Standby SW
AGC on level SW
AGC SW
Input1
Input2
Input3
Input4
L
R
AGC
AGC
Automatic detection Automatic power save
Mix circuit
4 to 8 Speaker amplifier

Publication date: April 2004
SDC00056AEB
1
AN12941A
Application Circuit Example
AGC on lebel change Supply voltage 5 V 10 F VCC _SP -2 dBV +4 dBV L-channel SP out 4 to 16 -2 dBV 29 30 31 -16 dBV 32 33 34 SP save on/off 35 36 37 GND 38 39 40 -16 dBV 41 42 GND +9 dB 43 0 dB Det. -16 dBV 0 dB +14 dB SP GND Power Save -16 dBV VCC _SP +14 dB VCC _SP +14 dB 28 27 26 25 24 +14 dB SP GND Mute 23 22 21 0.047 F 47 k 10 F VCC _SP -2 dBV +4 dBV R-channel SP out 4 to 16 -2 dBV Automatic detection output Supply voltage 3.3 V
Save CTL Mute Signal Det.
Control 10 k
10 k 0.47 F 0.47 F
20 GND 19 VREF (SP) 18 17 16 15 GND 14 13 12 11
4.7 F
AGC on/off
1 F 100 k 0.47 F HP out L-channel
Audio automatic detection on/off control 0.47 F
+9 dB AGC +3 dB AGC +3 dB +3 dB
-16 dBV -16 dBV 44 +3 dB HP amplifier L-channel 45 0.47 F 46 47 48 49 2.4 V 50 51 52
-16 dBV -16 dBV
HP out R-channel HP amplifier R-channel
-22 dBV -28 dBV
0 dB
Audio control volume V
-22 dBV -28 dBV
REF
0 dB
0 dB 10 9
0.47 F Audio control volume VREF
8 20 k 10 k
0 dB
-22 dBV -28 dBV 20 k VREF 8 7 -16 dBV -22 dBV 0.47 F STB -16 dBV -22 dBV 0.47 F 1 F
0.47 F -16 dBV L-channel in -22 dBV 0.47 F 4.7 F from modem -16 dBV 0.47 F -22 dBV -16 dBV -22 dBV 0.47 F
Signal on/off
Signal on/off R-channel in
-6 dB VREF 53 -22 dBV -28 dBV 54 -6 dB 55 -22 dBV -28 dBV 56 -6 dB Beep -22 dBV -28 dBV
6 -22 dBV -28 dBV -6 dB 5 Standby 4 -6 dB REG 3 2 VCC 1
from PCcard
-22 dBV -28 dBV
SP gain high/low SW
from beep
10 F
2
SDC00056AEB
AN12941A
Pin Description
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 VCC SP gain high/low SW REG ripple filter pin Input for PCcard Standby on/off control R-channel input Main signal mute on/off control VREF R-channel for volume Audio mix amplifier R-channel output Volume control signal R-channel input R-channel output for HP amplifier Negative feedback pin for alarm mix amplifier R-channel Alarm mix amplifier R-channel output AGC R-channel output GND SP amplifier R-channel input Signal automatic detection on/off control AGC on/off control VREF_SP GND Demodulation pin for signal automatic detection Signal automatic detection output GND_SP R-channel SP amplifier R-channel positive phase output (+) SP amplifier R-channel positive phase output (+) SP amplifier R-channel negative phase output (-) SP amplifier R-channel negative phase output (-) VCC_SP R-channel Description Pin No. 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 Description VCC_SP L-channel SP amplifier L-channel negative phase output (-) SP amplifier L-channel negative phase output (-) SP amplifier L-channel positive phase output (+) SP amplifier L-channel positive phase output (+) GND_SP L-channel SP power save control AGC on level control GND Signal auto detection amplifier R-channel input Signal auto detection mix amplifier R-channel output AGC demodulation pin SP amplifier L-channel input GND AGC L-channel output Alarm mix amplifier L-channel output Negative feedback pin for alarm mix amplifier L-channel L-channel output for HP amplifier Volume control signal L-channel input Audio mix amplifier L-channel output Voltage output for AGC level change Signal auto detection amplifier L-channel input Signal auto detection mix amplifier L-channel output L-channel input VREF Input for modem GND Input for beep
Note) SP: Speaker HP: Headphone REG: Regulator
SDC00056AEB
3
AN12941A
Absolute Maximum Ratings
Parameter Supply voltage Supply current Power dissipation
*2 *3 *1
Symbol VCC VCC_SP ICC PD Topr Tstg Popr Gopr Sopr
Rating 5.75 5.75 517 -20 to +75 -55 to +150 1.013 x 105 0.61 x 105 9 810 4 900
Unit V mW C C Pa m/s2 m/s2
Operating ambient temperature Storage temperature
*3
Operating ambient atmospheric pressure Operating constant gravity Operating shock
Note) *1: The values under the condition the above absolute maximum ratings and the power dissipation. *2: Ta = 75C, the value under the condition which this device is mounted on a four-layer printed wiring board and in addition its radiation part is soldered. (Reference to Technical Data, * Power dissipation of package HSOP056-P-0300A) *3: Except for the storage temperature and operating ambient temperature, all ratings are for Ta = 25C.
Recommended Operating Range
Parameter Supply voltage Symbol VCC VCC_SP* Rating 3.0 to 5.5 3.0 to 5.5 Unit V
Note) *: The values under the condition the above absolute maximum ratings and the power dissipation.
Electrical Characteristics at VCC = 5 V, VCC_SP = 5 V
Note) Ta = 25C 2C unless otherwise specified.
Parameter Circuit current Circuit current 1A at non-signal (VCC) Circuit current 2A at non-signal (VCC_SP) Circuit current 1B at non-signal (VCC) Circuit current 2B at non-signal (VCC_SP) Circuit current 1C at non-signal (VCC) Circuit current 2C at non-signal (VCC_SP)
Symbol IVCCA IVCCSA IVCCB
Conditions VCC = 3.3 V, at non-signal, Automatic distinction: on VCC = 3.3 V, at non-signal, Automatic distinction: on VCC = 3.3 V, at non-signal, Power save: off at non-automatic distinction VCC = 3.3 V, at non-signal, Power save: off at non-automatic distinction VCC = 3.3 V, at non-signal, Power save: on at non-automatic distinction VCC = 3.3 V, at non-signal, Power save: on at non-automatic distinction
Min 4.4 4.8
Typ 8.7 400 9.5
Max 13.0 600 14.2
Unit mA A mA
IVCCSB
8.1
16.2
mA
IVCCC
4.1
8.1
12.1
mA
IVCCSC
400
600
A
4
SDC00056AEB
AN12941A
Electrical Characteristics at VCC = 5 V, VCC_SP = 5 V (continued)
Note) Ta = 25C 2C unless otherwise specified.
Parameter Circuit current (continued) Circuit current 1D at non-signal (VCC) Circuit current 2D at non-signal (VCC_SP) L-channel audio output level R-channel audio output level L-channel audio output distortion R-channel audio output distortion L-channel audio output noise R-channel audio output noise L-channel maximum output power R-channel maximum output power L-channel maximum output power R-channel maximum output power Cross talk R-channel L-channel Cross talk L-channel R-channel AGC output level
Symbol IVCCD IVCCSD
Conditions VCC = 3.3 V, at standby mode VCC = 3.3 V, at standby mode
Min
Typ 10 10
Max 50 50
Unit A A
Speaker amplifier (Pin 52, pin 6 pin 24 to pin 27, pin 33 to pin 30) VOSPL VOSPR THSPL THSPR VNSPL VNSPR VIN = -22 dBV, 1 kHz, RL = 8 VIN = -22 dBV, 1 kHz, RL = 8 VIN = -22 dBV, 1 kHz, RL = 8 , to THD fifth VIN = -22 dBV, 1 kHz, RL = 8 , to THD fifth At non-signal, RL = 8 , A curve filter At non-signal, RL = 8 , A curve filter 2.0 2.0 0.7 0.7 64 64 5.5 4.0 4.0 0.04 0.04 -65 -74 1.0 1.0 2.0 2.0 68 68 7.0 6.0 6.0 0.5 0.5 -62 -68 8.5 dBV dBV % % dBV dBV W W W W dB dB dBV
VM8SPL VIN = 1 kHz, at THD = 10%, RL = 8 to THD fifth, at AGC = off VM8SPR VIN = 1 kHz, at THD = 10%, RL = 8 to THD fifth, at AGC = off VM4SPL VIN = 1 kHz, at THD = 10%, RL = 4 to THD fifth, at AGC = off VM4SPR VIN = 1 kHz, at THD = 10%, RL = 4 to THD fifth, at AGC = off VCTSPL VIN = -22 dBV, 1 kHz, RL = 8 A curve filter VCTSPR VIN = -22 dBV, 1 kHz, RL = 8 A curve filter VAGSPL VIN = -6 dBV, 1 kHz, RL = 8 VAGSPR A curve filter VBESPL VIN = -10 dBV, 1 kHz, pin 56 input VBESPR VMDSPL VIN = -10 dBV, 1 kHz, pin 54 input VMDSPR VPCSPL VIN = -10 dBV, 1 kHz, pin 4 input VPCSPR VIN = 1 kHz, VIN at THD = 1% VHPMAL VIN = 1 kHz, VIN at THD = 1% VHPMAR
Mix amplifier characteristic 1 (Pin 4, pin 54, pin 56 pin 46, pin 11) L-channel, R-channel output level at beep signal mix L-channel, R-channel output level at modem signal mix L-channel, R-channel output level at PCcard signal mix Each entry pin max input level Maximum amplifier output for the HP amplifier -17 -17 -17 0.6 0.3 -16 -16 -16 -15 -15 -15 dBV dBV dBV V[rms] V[rms]
SDC00056AEB
5
AN12941A
Electrical Characteristics at VCC = 5 V, VCC_SP = 5 V (continued)
Note) Ta = 25C 2C unless otherwise specified.
Parameter
Symbol
Conditions
Min
Typ -81
Max -75
Unit dBV
Mix amplifier characteristic 2 (continued) (Pin 56, pin 54, pin 52, pin 4, pin 6 pin 44, pin 13) L-channel, R-channel mix amplifier VOFSPL VIN = -16 dBV, 1 kHz cross talk in case of signal off VOFSPR pins 4, 6, 52, 54, 56: input Pre-amplifier output at L-channel input Pre-amplifier output at R-channel input Pre-amplifier output at beep signal input Pre-amplifier output at modem signal input Pre-amplifier output at PCcard signal input Distinction output high level Distinction output low level Voltage holding mode Entry signal on/off Voltage range holding on Entry signal on/off Voltage range holding off AGC on/off Voltage range holding on AGC on/off Voltage range holding off Signal automatic detection function Voltage range holding on Signal automatic detection function Voltage range holding off Sandby on/off Voltage range holding off Sandby on/off Voltage range holding on SP amplifier power save on/off Voltage range holding off SP amplifier power save on/off Voltage range holding on V7H V7L V18H V18L V17H V17L V5H V5L V35H V35L 2.0 0.0 2.0 0.0 2.0 0.0 2.0 0.0 2.0 0.0 5.0 0.8 5.0 0.8 5.0 0.8 5.0 0.8 5.0 0.8 V V V V V V V V V V VSDTL VSDTR VIN = -46 dBV, 1 kHz VIN = -46 dBV, 1 kHz
Signal detection system characteristic (Pin 52, pin 6, pin 54, pin 56, pin 4 pin 51, pin 39) -22 -22 -22 -22 -22 -65 2.3 -20 -20 -20 -20 -20 -60 3.3 0.1 -18 -18 -18 -18 -18 -55 1.0 dBV dBV dBV dBV dBV dBV V V
VSDTBE VIN = -46 dBV, 1 kHz VSDTMD VIN = -46 dBV, 1 kHz VSDTPC VIN = -46 dBV, 1 kHz
Detection level 1 at high sensitivity VSDTTH VIN = 1 kHz VSDTHI VIN = 1 kHz VSDTLO VIN = 1 kHz
6
SDC00056AEB
AN12941A
Electrical Characteristics at VCC = 5 V, VCC_SP = 5 V (continued)
Note) Ta = 25C 2C unless otherwise specified.
Parameter SP gain high/low SW +6 dB/0 dB Voltage range holding +6 dB SP gain high/low SW +6 dB/0 dB Voltage range holding 0 dB
Symbol V2H
Conditions
Min 2.0
Typ
Max 5.0
Unit V
Voltage holding mode (continued)
V2L
0.0
0.8
V
Control terminal , The mode table
Pin No. 7 18 17 5 35 Pin Name Entry signal on/off AGC on/off Signal automatic detection function Standby on/off SP power save on/off Voltage of Pin Low Signal off AGC off Automatic distinction off STB on Save on (SP off) 0 dB High Signal on AGC on Automatic distinction on STB off Save off (SP on) +6 dB Remarks The power saving operation by pin 35 has priority over any automatic detection The gain difference is about 6 dB
2
SP gain high/low SW
Pin No. 36
Pin Name At the time of AGC: on, It changes on level.
Voltage of Pin 0.5 V to 1.5 V On level: -3 dB to +3 dB
Note) *: The holding range of control voltage is shown in page 6 to page 7 of Electrical Characteristics.
Terminal Equivalent Circuits
Pin No. 28, 29 Equivalent Circuits Description VCC_SP: It is the specifically designed power pin of the speaker amplifier. Pin 28 is for R-channel Pin 29 is for L-channel Because the big electric current flows,it is desirable to separate from the VCC line to the other power pin on the board pattern.
SDC00056AEB
Corrugation and Voltage DC 5 V
7
AN12941A
Terminal Equivalent Circuits (continued)
Pin No. 24, 25, 26, 27 30, 31, 32, 33 Equivalent Circuits VCC_SP (5.0 V) 18 k Pin 31 32 25 26 Description Speaker Output: It is output pins of the speaker amplifier. It becomes BTL output. The L-channel positive phase output pin: Pin 32, pin 33 The L-channel negative phase output pin: Pin 30, pin 31 The R-channel positive phase output pin: Pin 24, pin 25 The R-channel negative phase output pin: Pin 26, pin 27 To reduce voltage loss by the wire resistance in maximum output, it makes output 2 pins. Also, when the speaker amplifier saves power, too, DC voltage is maintained. The output impedance: Equal to or less than 10 GND: It is GND pin for the speaker amplifier. Pin 23 is for R-channel Pin 34 is for L-channel Because the big electric current flows, it is desirable to separate from the GND line to the other GND pin on the board pattern. Also, it isn't connected with the substrate potential in the IC. 22 Corrugation and Voltage DC 2.2 V AC 4 dBV Pin 32, pin 33 Pin 24, pin 25 positive
3.6 k
Pin 30 33 24 27
Pin 30, pin 31 Pin 26, pin 27 negative
23, 34
DC 0 V
22 45 k
Audio signal automatic detection Signal nothing distinction output: DC 0 V It outputs the distinction result of Signals there the audio signal automatic detection being DC 3.3 V circuit. The output form is the open collector output from of the NPN transistor. Therefore, the pull rises and uses for the power by the external resistance (equal to or more than 10 k). Signal's there being: Output high Signal nothing: Output low Open collector output The electric current ability: Equal to or more than 100 A
SDC00056AEB
8
AN12941A
Terminal Equivalent Circuits (continued)
Pin No. 21 Equivalent Circuits VREG (3.0 V) 90 Description Corrugation and Voltage
21
90 k
Audio automatic detecting detection Signal nothing DC 0 V pin: It connects a condenser for the peak Signals there detection. It is the circuit which being DC 2 V detects a peak after rectifying the audio signal of the audio signal automatic detection circuit in both waves. By changing a capacity value, the time which the power saving depends on in case of the switchover which is without signal with signal's there being can be changed. Signal less time: Constant current source Signal's there being: Emitter follower The output impedance: About 200 GND: It is the GND pin of the signal system. It is connected with the substrate potential of the IC. Pin 15, pin 42 connect with the lead frame of the IC. DC 0 V
15, 20, 37, 42, 55 19
VCC_SP (5.0 V)
133 k 19 137 k 17 9 k 49-pin (2.4 V)
VREF_SP: It is the standard voltage pin to fix the DC bias of the speaker output. It connects a condenser to remove a ripple. The output impedance: About 60 k
DC 2.2 V
27 k 63 k 9 k
45 k
17
Signal automatic detection function on/off control pin: We change an audio signal automatic detection function in on/off. In case of automatic detection off, it controls power saving by speaker with the manual with the power saving on/off pin. High: Function on Low: Function off The entry impedance: The high impedance
DC
SDC00056AEB
9
AN12941A
Terminal Equivalent Circuits (continued)
Pin No. 16, 41 Pin 16 41 50 k Equivalent Circuits Description Corrugation and Voltage
VREF (1.5 V)
DC 1.5 V Speaker amplifier entry: It is the voice input pins of the AC -16 dBV speaker amplifier. To make offset voltage in power saving on/off changing by the Speaker amplifier amplifier little, it combines capacity. (It makes pop noise small). Pin 16: R-channel SP amplifier entry Pin 41: L-channel SP amplifier entry The entry impedance: About 50 k AGC amplifier output: DC 1.5 V It is the output pin of the AGC circuit AC -16 dBV to hold an output clip in excessive output of the speaker output. Pin 14: The AGC R-channel output Pin 43: The AGC L-channel output The output impedance: Equal to or less than about 10
14, 43
VREG (3.0 V)
Pin 14 43 90
13, 44
12.7 k
18 k
VREG (3.0 V) Alarm mix amplifier output pins: It is output pins of the mix amplifier to mix an alarm signal and an audio signal. Pin 13: R-channel output Pin 13 Pin 44: L-channel output 44 The output impedance: Equal to or less than about 10 Alarm mix amplifier negative feedback pins: It is the negative feedback of the mix amplifier to mix an alarm signal and an audio signal. It is possible to adjust in the direction which lowers the gain of the mix amplifier in putting resistance among above mentioned mix amplifier output pins. Pin 12: R-channel negative feedback pin Pin 45: L-channel negative feedback pin The entry impedance: The high impedance
DC 1.5 V AC -25 dBV
12, 45
VREG (3.0 V) Pin 12 45
DC 1.5 V
9 k
10
SDC00056AEB
AN12941A
Terminal Equivalent Circuits (continued)
Pin No. 9, 48 Equivalent Circuits VREG (3.0 V) Description Corrugation and Voltage
4.6 k Pin 9 48 4.6 k
Audio signal mix amplifier output pin: DC 1.5 V It is the output of the mix amplifier AC -28 dBV to mix a signal from the modem, the beep, the PCcard to an audio signal. Pin 9: The R-channel output Pin 48: The L-channel output The output impedance: Equal to or less than about 10
10, 47
VREG (3.0 V)
Pin 10 47
Entry for EVR: It is the amplifier entry to adjust an output level to the HP amplifier. It becomes the entry of the EVR adjustment signal. The entry impedance: The high impedance
DC AC -28 dBV
7
49-pin (2.4 V)
81 k 90 k 126 k 7
Audio signal on/off changing control pin: It is the control pin which changes whether to communicate an audio signal to the amplifier to mix an alarm signal and an audio signal. At the time of off, only an alarm audio is output from the mix amplifier. High: Signal on Low: Signal off The entry impedance: The high impedance Audio signal input: It enters a main audio signal. Pin 6: R-channel entry Pin 52: L-channel entry The entry impedance: About 45 k
DC
6, 52
Pin 6 VREG (3.0 V) 52
DC 1.5V AC -22 dBV
25.2 k
25.2 k
VREF (1.5 V)
SDC00056AEB
11
AN12941A
Terminal Equivalent Circuits (continued)
Pin No. 4 4 25.2 k Equivalent Circuits VREG (3.0 V) Description PCcard signal entry: It is the entry pin to enter a signal from the PCcard. With the audio signal mix amplifier of the following paragraph, the same signal is entered both by L-channel and R-channel. Also, it has the function which is the same as the beep entry of pin 56, the modem entry by pin 54 completely. The entry impedance: About 45 k Ripple removal condenser pin for the regulator: To remove a power ripple with the regulator circuit to create the inner power (VREG), it puts a condenser. The entry impedance: About 100 k Corrugation and Voltage DC 1.5V AC -16 dBV
25.2 k
VREF (1.5 V) 3 VREG (3.0 V) VCC (3.3 V) DC 1.5 V
243 k 3 9 k
207 k
2
49-pin (2.4 V)
81 k 90 k 126 k 2
SP gain high/low CTL: It is the terminal which controls gain 0 dB/+6 dB of SP output. High: +6 dB Low: 0 dB The entry impedance: The high impedance
DC
1
VCC : It is the power (VCC) pin to supply the regulator circuit to create the inner power VREG with the voltage. It is separating from VCC_SP of pin 28, pin 29 fully inside. It is desirable to separate as far as it finishes coming out about the P board pattern, too.
DC 3.3 V
12
SDC00056AEB
AN12941A
Terminal Equivalent Circuits (continued)
Pin No. 5 90 k Equivalent Circuits 5 Description Corrugation and Voltage
270 k
Standby on/off changing SW: Open voltage DC 0 V It changes whether or not it makes this IC an operation condition or whether or not it makes it a standby. High: The operation condition Low: Standby In that the power changes a connected condition to the standby, the circuit electric current can be almost made 0. The entry impedance: About 80 k Beep input: It is the entry pin to enter beep signal. The same signal is entered both by L-channel and R-channel with the audio signal mix amplifier of the following paragraph. Also, it has the function which is the same as the PCcard signal entry by pin 4, the modem signal entry by pin 54 completely. The entry impedance: About 45 k VREF: With the pin to fix the bias voltage (the operation point) of the system which the inner power (VREG) works, it becomes 1/2VREG (V). To remove noise, it connects a condenser with the interval of between pin 53 and GND. The entry impedance: About 80 k Modem input: It is the entry pin to enter a signal from the modem. With the audio signal mix amplifier of the following paragraph, the same signal is entered both by L-channel and R-channel. Also, it has the function which is the same as the PCcard signal entry by pin 4, the beep signal entry by pin 56 completely. The entry impedance: About 45 k DC 1.5 V AC -22 dBV
56 56 25.2 k
25.2 k VREF (1.5 V) 53 VREG (3.0 V) 180 k 53 180 k
DC 1.5 V
54 54
VREG (3.0 V)
DC 1.5 V AC -22 dBV
25.2 k
25.2 k VREF (1.5 V)
SDC00056AEB
13
AN12941A
Terminal Equivalent Circuits (continued)
Pin No. 39, 51 Equivalent Circuits VREG (3.0 V) Description The signal detection system pre-amplifier negative return terminal: It is the output terminal for signal detection system pre-amplifier. Pin 39 The output impedance: 51 Equal to or less than about 10 Corrugation and Voltage DC 1.5 V AC -22 dBV
VREF (1.5 V) 9 k 0.9 k
38, 50
Pin 38, Pin 50
The signal detection system pre-amplifier input terminal: It is the input terminal for signal detection system pre-amplifier. The entry impedance: About 10 k
DC 1.5 V AC -22 dBV
10 k
VREF (1.5 V) 40 VREG (3.0 V) AGC detection pin: It is the detection circuit to detect the signal level of the AGC circuit of the SP output for the clip prevention. It connects a condenser for the detection. The entry impedance: Unsettled DC 0 V to 1 V
1.8 k 40 144 k 18 9 k
49-pin (2.4 V)
17 k 63 k 9 k
90 k
18
AGC on/off control pin: It is the pin which controls the operating operation of the AGC circuit of the SP output for the clip prevention in on/off. At the time of off, the AGC circuit doesn't work. High: AGC on Low: AGC off The entry impedance: The high impedance
DC
14
SDC00056AEB
AN12941A
Terminal Equivalent Circuits (continued)
Pin No. 49 Equivalent Circuits VREG (3.0 V) Description DC output for the AGC on level adjustment: It is an DC voltage output terminal for the AGC on level adjustment. The output impedance: Equal to or less than about 10 Corrugation and Voltage DC 2.4 V
8.1 k
49
11.3 k 36 36 It changes AGC on level: It is the pin which changes the on level of AGC. The entry impedance: The high impedance DC 1.5 V
35
49-pin (2.4 V)
81 k 45 k 128 k 35
SP amplifier power saving on/off control pin: It is the pin which controls power saving by the SP amplifier. At the time of on in addition to the control in case of automatic distinction function off, too, power saving on by pin 50 has priority over. The entry impedance: The high impedance Standard bias source for EVR: It is possible to use as GND (the DC bias source) AC when connecting external EVR. It is possible to attenuate in the AC signal without cutting a signal system in "C". The output impedance: Equal to or less than about 10
DC 1.3 V
8
VREG (3.0 V)
DC 1.5 V
VREF DC 1.5 V
8
SDC00056AEB
15
AN12941A
Terminal Equivalent Circuits (continued)
Pin No. 11, 46 Equivalent Circuits VREG (3.0 V) Description Output pins for the HP amplifier: It is output pins for the external HP amplifier. The signal which was adjusted in the volume in EVR can be output by the low impedance. The output impedance: Equal to or less than about 10 Corrugation and Voltage DC 1.5 V AC -28 dBV
Pin 11 46
16
SDC00056AEB
AN12941A
Application Notes
Circuit Descriptions 1. Input inverting amplifier and signal mix circuit block Input inverting amplifier block 1) The input impedance of each input pin is about 50 k. 2) Each input impedance is 10% of variation exists by diffusion variation. 3) The gain of the input part is able to lowered by adding resistance to input pin in series. When addition resistance is set to Ra (k) 25.2 Ga = 50 + Ra Signal mix circuit block 1) It is added (mix) in the inverting amplifier method. Mix ratio is 1 to 1 for each input. 2) Connect volume to this mix amplifier output, allowing you to vary the next stage input level. 3) Pin 8 is the VREF output pin for volume reference.
Audio signal L-channel input
25.2 k
0 dB
52
25.2 k 25.2 k Mix Mix
48
External volume
Vol.out audio signal
0dB
47 8V REF
46
L-channel
PCcard input
4
25.2 k 25.2 k
Mix
Beep input
56
25.2 k 25.2 k
It adds to the main audio signals in inverting amplifier form. Mix ratio is 1 to 1. * Signal from PCcard * Beep signal * Signal from modem
It becomes the volume for sound control by external resistance change. Gain is 0 dB at maximumvolume.
Modem signal input
54
25.2 k Mix Mix 0 dB
9
External volume
Vol.out audio signal
0dB
Audio signal R-channel input
25.2 k
6
25.2 k
Mix
10 8 VREF
11
R-channel
SDC00056AEB
17
AN12941A
Application Notes (continued)
2. Signal detection system mix circuit block Signal detection system mix circuit block 1) Each input signal in accordance with mix ratio of 1 to 1. Signals are detected by separate systems to prevent cancellation in the case of negative phase input for main signal R-channel and L-channel. Main audio signal L-channel Main audio signal R-channel Beep signal Signal from PCcard Signal from modem 2) Signal detection sensitivity can be adjusted with 10 k external resistance connected between pin 50 and pin 51 or pin 38 and pin 39. 3) The signals input via pin 38 and pin 50 first undergo double-wave rectification, and then peak detection is performed using the external condensor connected to pin 21.
0.47 F 10 k Audio signal 52 L-channel input Modem signal 54 input 51 10 k 50
Beep input 56 0.47 F 10 k Audio signal R-channel input 6 39 38 10 k
Signal detection
21 0.047 F
PCcard input
2
Note) Adjust the detection sensitivity using 10 k external resistance. If noise is high for the set, use more than 10 k (between about 10 k and 200 k).
18
SDC00056AEB
AN12941A
Application Notes (continued)
2. Signal detection system mix circuit block (continued) Detection sensitivity threshold values vs. external resistance
Detection threshold value vs. resistance constant (L-channel) between pin 50 and pin 51
Detection threshold value (L-channel)
Detection threshold value (L-channel input level) (dBV)
-40
-50
-60
-70
1
Resistance constant (between pin 50 and pin 51) (k)
10
100
1 000
Power save of speaker power amplifier 1) When input signal level is lower than a certain value due to signal automatic detection circuit, power save of speaker power amp will be operated. 2) This automatic detecting function is able to stopped by pin 17. 3) When the automatic detection is off, it control manual control by pin 35. 4) Also when the automatic detection is on, manual power save on is prioritized. When it control only the automatic detecting function, set pin 35 to power save off. Signal detecting distinction output 1) The result of automatic signal detection is output from pin 22. VCC 51 50 17 Automatic signal detection function on/off VCC Signal detection 47 k 22 Automatic signal detection monitor pin VCC 35 Power save on/off
39
38 0.047 F
21
Power save of speaker power amplifier
SDC00056AEB
19
AN12941A
Application Notes (continued)
3. Main signal on/off change and alarm signal mix circuit block Main signal on/off circuit 1) The speaker amplifier section is set to Mute when main signal is off. 2) High: Signal on , Low: Signal off Main signal level adjustment 1) The gain of this inverting amplifier can be reduced by adding external resistance in parallel between pin 12 and pin 13 or pin 44 and pin 45. When addition resistance is set to Rd (k) 18 x (9 + Rd) Gd = 12.7 x (18 + 9 + Rd)
Headphone 9 10 12.7 k 11 18 k 12 VCC 7 Mute 12.7 k 48 47 46 18 k 45 Rd 44 +3 dB 43 +9 dB Rd 3 dB AGC 14 13 +3 dB +9 dB 3 dB AGC
8 VREF
9 k
8 VREF Headphone
9 k
20
SDC00056AEB
AN12941A
Application Notes (continued)
4. Signal detection system mix circuit block AGC detection 1) The signal inputted from pin 41 and pin 16 is rectified on both waves and then mixed with L + R. 2) The above signal is peak-detected by the external part of pin 40. External is giving double-detection constant. 3) When the voltage of pin 40 is equal or more than 0.7 V, AGC is on.
2.4 V 49 for setting AGC level
+3 dB 44 AGC +9 dB AGC 18 on/off AGC detection
43
41
36
40
+3 dB
13
AGC +9 dB
14
16
The output wave at the time of AGC operation It is the following output wave form chart at the AGC operation time. Graph showing output wave when identical sound signals are input to two AN12941A ICs, one with AGC set to off and the other with AGC set to on. Using identical input signals, VCC, VCC_SP = 5 V RL = 8
AGC off
AGC on
SDC00056AEB
21
AN12941A
Application Notes (continued)
5. Speaker amplifier circuit block DC shift circuit 1) Shift circuit operating point of signal (bias voltage at a no signal) from VREF to VREF_SP. DC voltage (speaker output) of output becomes VREF_SP. Speaker amplifier 1) Speaker amplifier is BTL amplifier system of 2-channel. Power save -10 dBV 43 41 50 k VREF 0 dB 0 dB DC shift 0 dB 30 31 33 32 4 to 8 Out-L (SP)
Power save -10 dBV 14 16 50 k VREF 0 dB 0 dB DC shift 0 dB 26 27 24 25 4 to 8 Out-R (SP)
Muted in sync with power save of speaker amplifier.
An operating point is shifted from VREF to VREF_SP.
6. Control order at power supply on/off chcange Power supply on When switching power on, it is recommended to use a speaker amplifier during a transient period from power on till a stable condition of a circuit to ensure that a circuit start up smoothly by protecting from any shock noise of a speaker circuit. 1) Control order 1. Power supply (VCC_SP, VCC): Change off to on 2. Standby control: Change on to off 3. Speaker amplifier power save control: Change on to off
22
SDC00056AEB
AN12941A
Application Notes (continued)
6. Control order at power supply on/off change (continued) Power supply on (continued) 2) Control timing
VCC_SP (Pin 28, pin 29)
Time difference would not cause any abnormality at VCC_SP and VCC atart up Standby reset after VCC_SP and VCC reach normal voltage Time difference: Equal to or more than 1.0 sec *1
VCC (Pin 1)
Standby control (Pin 5)
Speaker pawer save control (Pin 35) Power supply on Standby control reset (Control voltage: Change low to high) Speaker pawer save control reset (Control voltage: Change low to high)
Note) *1: Time covering from standby control cancellation until a circuit stabilization to normal state. It depends on the capacitance connected to reference voltage (VREF, VREF_SP) pin. It is recommendation value of 4.7 F.
Power supply off When switching power off, it is recommended to take the order of first applying power save control to a speaker amplifier so that a circuit transient change may not effect on a speaker output. 1) Control order 1. Speaker amplifier power save control: Change off to on 2. Standby control: Change off to on 3. Power supply (VCC_SP, VCC): Change on to off
SDC00056AEB
23
AN12941A
Application Notes (continued)
6. Control order at power supply on/off chcange (continued) Power supply off (continued) 2) Control timing
VCC_SP (Pin 28, pin 29) Time difference would not cause any abnormality at VCC_SP and VCC atart down Time difference: Equal to or more than 100 msec Time difference: Equal to or more than 100 msec Standby control on (Control voltage: Change high to low)
VCC (Pin 1)
Standby control (Pin 5)
Speaker pawer save control (Pin 35) Speaker pawer save control on (Control voltage: Change high to low)
Power supply off
After power supply start up (Usual operating condition) Shock noise is likely to occur if you switch a standby control without applying a speaker power save. Therefore, do not forget to apply speaker save before switching to standby control. 7. Power dissipation of package HSOP056-P-0300A PD Ta
5.000
4.280 4.000
Power dissipation PD (W)
Mounted on four layers of stndard board (50 x 50 x 0.8 mm3) Rth(j-a) = 29.2C/W 3.000
2.000
Mounted on stndard board (50 x 50 x 0.8 mm3) Rth(j-a) = 79.5C/W 1.572
1.000
0.862 Independent IC without a heat sink Rth( j-a) = 144.9C/W
0.000 0 25 50 75 100 125 150
Ambient temperature Ta (C)
Note) The above characteristic is a reference value in case of design and is not a guarantee value.
24
SDC00056AEB
AN12941A
Application Notes (continued)
Main characteristics 1) I/O characteristics, frequency characteristics (1) SP I/O level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = On, SP gain setting = High, VCC = 3.3 V, VCC_SP = 5.0 V, Input frequency = 1 kHz, R-out = 8 , HPF: 400 Hz, LPF: 30 kHz
SDC00056AEB
25
AN12941A
Application Notes (continued)
Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (1) SP I/O level, distortion characteristics (R-channel, L-channel) (continued) AGC = Off, Automatic detection = On, SP gain setting = Low, VCC = 5.0 V, VCC_SP = 5.0 V, Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz
26
SDC00056AEB
AN12941A
Application Notes (continued)
Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (2) SP I/O level, distortion characteristics (Beep) AGC = Off, Automatic detection = Off, SP gain setting = High, VCC = 3.3 V, VCC_SP = 5.0 V, Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz
SDC00056AEB
27
AN12941A
Application Notes (continued)
Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (3) SP frequency level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = On, SP gain setting = High, VCC = 3.3 V, VCC_SP = 5.0 V, Input level = -22 dBV
28
SDC00056AEB
AN12941A
Application Notes (continued)
Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (3) SP frequency level, distortion characteristics (R-channel, L-channel) (continued) AGC = Off, Automatic detection = On, SP gain setting = Low, VCC = 5.0 V, VCC_SP = 5.0 V, Input level = -16 dBV
SDC00056AEB
29
AN12941A
Application Notes (continued)
Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (4) SP frequency level, distortion characteristics (Beep) AGC = Off, Automatic detection = Off, SP gain setting = High, VCC = 3.3 V, VCC_SP = 5.0 V, Input level = -22 dBV
30
SDC00056AEB
AN12941A
Application Notes (continued)
Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (5) SP - AGC I/O level, distortion characteristics (R-channel, L-channel) AGC = On, Automatic detection = On, VCC = 3.3 V, VCC_SP = 5.0 V, Input frequency = 1 kHz, R-out = 8 , HPF: 400 Hz, LPF: 30 kHz
SDC00056AEB
31
AN12941A
Application Notes (continued)
Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (6) SP - AGC frequency level, distortion characteristics (R-channel, L-channel) AGC = On, Automatic detection = On, VCC = 3.3 V, VCC_SP = 5.0 V, Input frequency = 1 kHz, R-out = 8 , HPF: 400 Hz, LPF: 30 kHz
32
SDC00056AEB
AN12941A
Application Notes (continued)
Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (7) Mix amplifier I/O level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP power save, VCC = 3.3 V, VCC_SP = 5.0 V, Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz
SDC00056AEB
33
AN12941A
Application Notes (continued)
Main characteristics (continued) 1) I/O characteristics, frequency characteristics (continued) (8) Mix amplifier frequency level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP power save, VCC = 5.0 V, VCC_SP = 5.0 V, Input level = -10 dBV
34
SDC00056AEB
AN12941A
Application Notes (continued)
Main characteristics (continued) 2) VCC, temperature variation characteristics (1) SP output level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP gain setting = High, VCC_SP = 5.0 V, Vin = -22 dBV Input frequency = 1 kHz, RL = 8 , HPF: 400 Hz, LPF: 30 kHz
SDC00056AEB
35
AN12941A
Application Notes (continued)
Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (1) SP output level, distortion characteristics (R-channel, L-channel) (continued) AGC = Off, Automatic detection = Off, SP gain setting = High, VCC_SP = 5.0 V, Vin = -22 dBV Input frequency = 1 kHz, RL = 4 , HPF: 400 Hz, LPF: 30 kHz
36
SDC00056AEB
AN12941A
Application Notes (continued)
Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (2) SP maximum output level characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP gain setting = High, VCC_SP = 5.0 V Input frequency = 1 kHz, RL = 8 , HPF: 400 Hz, LPF: 30 kHz
SDC00056AEB
37
AN12941A
Application Notes (continued)
Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (3) SP - AGC output level characteristics (R-channel, L-channel) AGC = On, Automatic detection = Off, SP gain setting = High, VCC_SP = 5.0 V, P36 = 1.05 V Vin = -6 dBV, Input frequency = 1 kHz, RL = 8 , HPF: 400 Hz, LPF: 30 kHz
38
SDC00056AEB
AN12941A
Application Notes (continued)
Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (4) Mix amplifier output level, distortion characteristics (R-channel, L-channel) AGC = Off, Automatic detection = Off, SP power save, VCC_SP = 5.0 V Vin = -10 dBV, Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz
SDC00056AEB
39
AN12941A
Application Notes (continued)
Main characteristics (continued) 2) VCC, temperature variation characteristics (continued) (5) Signal detection threshold value (R-channel, L-channel) AGC = Off, Automatic detection = On, VCC_SP = 5.0 V Input frequency = 1 kHz, HPF: 400 Hz, LPF: 30 kHz
40
SDC00056AEB
Request for your special attention and precautions in using the technical information and semiconductors described in this material
(1) An export permit needs to be obtained from the competent authorities of the Japanese Government if any of the products or technical information described in this material and controlled under the "Foreign Exchange and Foreign Trade Law" is to be exported or taken out of Japan. (2) The technical information described in this material is limited to showing representative characteristics and applied circuits examples of the products. It neither warrants non-infringement of intellectual property right or any other rights owned by our company or a third party, nor grants any license. (3) We are not liable for the infringement of rights owned by a third party arising out of the use of the technical information as described in this material. (4) The products described in this material are intended to be used for standard applications or general electronic equipment (such as office equipment, communications equipment, measuring instruments and household appliances). Consult our sales staff in advance for information on the following applications: * Special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the products may directly jeopardize life or harm the human body. * Any applications other than the standard applications intended. (5) The products and product specifications described in this material are subject to change without notice for modification and/or improvement. At the final stage of your design, purchasing, or use of the products, therefore, ask for the most up-to-date Product Standards in advance to make sure that the latest specifications satisfy your requirements. (6) When designing your equipment, comply with the guaranteed values, in particular those of maximum rating, the range of operating power supply voltage, and heat radiation characteristics. Otherwise, we will not be liable for any defect which may arise later in your equipment. Even when the products are used within the guaranteed values, take into the consideration of incidence of break down and failure mode, possible to occur to semiconductor products. Measures on the systems such as redundant design, arresting the spread of fire or preventing glitch are recommended in order to prevent physical injury, fire, social damages, for example, by using the products. (7) When using products for which damp-proof packing is required, observe the conditions (including shelf life and amount of time let standing of unsealed items) agreed upon when specification sheets are individually exchanged. (8) This material may be not reprinted or reproduced whether wholly or partially, without the prior written permission of Matsushita Electric Industrial Co., Ltd.
2003 SEP

▲Up To Search▲

Price & Availability of AN12941A

	To Download AN12941A Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .