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19-2841; Rev 1; 6/08
KIT ATION EVALU BLE AVAILA
3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown
General Description
The MAX9710/MAX9711 are stereo/mono 3W bridge-tied load (BTL) audio power amplifiers. These devices are PC99/01 compliant, operate from a single 4.5V to 5.5V supply, and feature an industry-leading 100dB PSRR, which allows these devices to operate from noisy supplies without additional, costly power-supply conditioning. An ultra-low 0.005% THD+N ensures clean, low-distortion amplification of the audio signal while click-and-pop suppression eliminates audible transients on power and shutdown cycles. Power-saving features include low 2mV V OS (minimizing DC current drain through the speakers), low 7mA supply current, and a 0.5A shutdown mode. A MUTE function allows the outputs to be quickly enabled or disabled. These devices include thermal overload protection, are specified over the extended -40C to +85C temperature range, and are supplied in thermally efficient packages. The MAX9710 is available in a 20-pin thin QFN package (5mm 5mm 0.8mm). The MAX9711 is available in a 12-pin thin QFN package (4mm 4mm 0.8mm). 3W into 3 (1% THD+N) 4W into 3 (10% THD+N) Industry-Leading, Ultra-High 100dB PSRR PC99/01 Compliant Click-and-Pop Suppression Low 0.005% THD+N Low Quiescent Current: 7mA Low-Power Shutdown Mode: 0.5A MUTE Function Tiny 20-Pin Thin QFN (5mm 5mm 0.8mm)
Features
MAX9710/MAX9711
Ordering Information
PART TEMP RANGE PIN-PACKAGE AMP Stereo Mono MAX9710ETP MAX9711ETC -40C to +85C 20-Thin QFN-EP* -40C to +85C 12-Thin QFN-EP*
Applications
Notebook PCs Flat-Panel TVs Flat-Panel PC Displays Two-Way Radios General-Purpose Audio Powered Speakers
*EP = Exposed pad.
Pin Configurations
TOP VIEW
OUTL+ OUTLPGND PVDD N.C.
Simplified Block Diagram
SINGLE SUPPLY 4.5V TO 5.5V
20 INL BIAS N.C. MUTE INR 1 2 3 4 5 6 PGND
19
18
17
16 15 14 PGND SHDN N.C. VDD
RIGHT IN LEFT IN
MAX9710
13 12 11
MAX9710
PGND
7 OUTR+
8 PVDD
9 OUTR-
10 N.C.
TQFN
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown MAX9710/MAX9711
ABSOLUTE MAXIMUM RATINGS
VDD to GND, PGND ...............................................................+6V PVDD to VDD .......................................................................0.3V PGND to GND.....................................................................0.3V All Other Pins to GND.................................-0.3V to (VDD + 0.3V) Continuous Input Current (into any pin except power supply and output pins).........................20mA Continuous Power Dissipation (TA = +70C) 12-Pin Thin QFN (derate 16.9mW/C above +70C) ....1349mW 20-Pin Thin QFN (derate 20.8mW/C above +70C) ....1667mW Operating Temperature Range............................-40C to +85C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+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 = PVDD = 5.0V, VGND = VPGND = VMUTE = 0V, V SHDN = 5V, RIN = RF = 15k, RL = . TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range Quiescent Supply Current (IVDD + IPVDD) Shutdown Supply Current Turn-On Time Thermal Shutdown Threshold Thermal Shutdown Hysteresis OUTPUT AMPLIFIERS Output Offset Voltage Power-Supply Rejection Ratio VOS PSRR VOUT_+ - VOUT_-, AV = 2 VRIPPLE = 200mVP-P (Note 2) fIN = 1kHz, THD+N < 1% fIN = 1kHz, BW = 22Hz to 22kHz VDD = 4.5V to 5.5V f = 1kHz f = 20kHz RL = 8 RL = 4 RL = 3 POUT = 1.2W, RL = 8 POUT = 2W, 4 1.1 82 2 100 87 74 1.4 2.6 3 0.005 0.01 95 1.6 No sustained oscillations fIN = 10kHz VBIAS RBIAS VIH VIL IIN 2 0.8 1 2.35 1 77 2.5 50 2.65 % dB V/s nF dB V k V V A W dB 14 mV SYMBOL VDD/PVDD IDD I SHDN tON MAX9710 MAX9711 SHDN = GND CBIAS = 1F (10% of final value) CBIAS = 0.1F (10% of final value) CONDITIONS Inferred from PSRR test MIN 4.5 12 7 0.5 300 30 160 15 TYP MAX 5.5 30 17 30 UNITS V mA A ms C C
Output Power Total Harmonic Distortion Plus Noise Signal-to-Noise Ratio Slew Rate Maximum Capacitive Load Drive Crosstalk BIAS VOLTAGE (BIAS) BIAS Voltage Output Resistance DIGITAL INPUTS (MUTE, SHDN) Input Voltage High Input Voltage Low Input Leakage Current
POUT
THD+N SNR SR CL
RL = 8, VOUT = 2.8VRMS, BW = 22Hz to 22kHz
Note 1: All devices are 100% production tested at +25C. All temperature limits are guaranteed by design. Note 2: PSSR is specified with the amplifier inputs connected to GND through RIN and CIN. 2 _______________________________________________________________________________________
3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown
Typical Operating Characteristics
(VDD = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
MAX9710/MAX9711
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAx9710/11 toc01
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAx9710/11 toc02
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
RL = 4 AV = -2V/V
MAx9710/11 toc03 MAX9710/11 toc09 MAx9710/11 toc06
1
RL = 3 AV = -2V/V
1
RL = 3 AV = -4V/V
1
0.1 THD+N (%) THD+N (%) POUT = 500mW
0.1 POUT = 500mW THD+N (%)
0.1 POUT = 250mW 0.01 POUT = 2.5W POUT = 2W 0.001 10 100 1k FREQUENCY (Hz) 10k 100k 10 100 1k FREQUENCY (Hz) 10k 100k
0.01 POUT = 2.5W 0.001 10 100 1k FREQUENCY (Hz) 10k 100k
0.01
0.001
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAx9710/11 toc04
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAx9710/11 toc05
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
1 RL = 8 AV = -4V/V
1
RL = 4 AV = -4V/V
1
RL = 8 AV = -2V/V
0.1 THD+N (%) POUT = 250mW THD+N (%)
0.1 THD+N (%)
0.1 POUT = 250mW 0.01
POUT = 250mW 0.01
0.01 POUT = 2W 0.001 10 100 1k FREQUENCY (Hz) 10k 100k
POUT = 1.2W 0.001 10 100 1k FREQUENCY (Hz) 10k 100k
POUT = 1.2W 0.001 10 100 1k FREQUENCY (Hz) 10k 100k
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX9710/11 toc07
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX9710/11 toc08
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
100 AV = -2V/V RL = 4
100
AV = -2V/V RL = 3
100
AV = -4V/V RL = 3
10
10
10
THD+N (%)
1 f = 10kHz
THD+N (%)
THD+N (%)
1 f = 10kHz 0.1 f = 1kHz
1 f = 10kHz
0.1
f = 20Hz
0.1
f = 1kHz
0.01 f = 1kHz 0.001 0 1 2 OUTPUT POWER (W) 3 4
0.01 f = 20Hz 0.001 0 1 2 OUTPUT POWER (W) 3 4
0.01 f = 20Hz 0.001 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 OUTPUT POWER (W)
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3
3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown MAX9710/MAX9711
Typical Operating Characteristics (continued)
(VDD = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX9710/11 toc10
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
MAX9710/11 toc11
TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER
AV = -4V/V RL = 8
MAX9710/11 toc12
100
AV = -4V/V RL = 4
100
AV = -2V/V RL = 8
100
10
10
10
THD+N (%)
THD+N (%)
THD+N (%)
1 f = 10kHz 0.1 f = 1kHz
1
1 f = 10kHz f = 1kHz
0.1 f = 1kHz
f = 10kHz
0.1
0.01 f = 20Hz 0.001 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 OUTPUT POWER (W)
0.01 f = 20Hz 0.001 0 0.5 1.0 OUTPUT POWER (W) 1.5 2.0
0.01 f = 20Hz 0.001 0 0.5 1.0 OUTPUT POWER (W) 1.5 2.0
OUTPUT POWER vs. TEMPERATURE
MAX9710/11 toc13
OUTPUT POWER vs. TEMPERATURE
MAX9710/11 toc14
OUTPUT POWER vs. TEMPERATURE
THD+N = 10%
MAX9710/11 toc15
4 THD+N = 10% 3 THD+N = 1% 2
4
2.0
OUTPUT POWER (W)
OUTPUT POWER (W)
OUTPUT POWER (W)
3
THD+N = 10% THD+N = 1%
1.5 THD+N = 1% 1.0
2
1 f = 1kHz RL = 3 0 -40 -15 10 35 60 85 TEMPERATURE (C)
1 f = 1kHz RL = 4 0 -40 -15 10 35 60 85 TEMPERATURE (C)
0.5 f = 1kHz RL = 8 0 -40 -15 10 35 60 85 TEMPERATURE (C)
OUTPUT POWER vs. LOAD RESISTANCE (FORCED-AIR COOLING)
VDD = 5V f = 1kHz
MAX9710/11 toc16
POWER DISSIPATION vs. OUTPUT POWER
MAX9710/11 toc17
POWER DISSIPATION vs. OUTPUT POWER
0.7 POWER DISSIPATION (W) 0.6 0.5 0.4 0.3 0.2 0.1 0 0 0.25 0.50 0.75 1.00 OUTPUT POWER (W) RL = 8 f = 1kHz 1.25 1.50
MAX9710/11 toc18
5
1.6 1.4 POWER DISSIPATION (W) 1.2 1.0 0.8 0.6 0.4 0.2 RL = 4 f = 1kHz 0 0.5 1.0 1.5 2.0
0.8
4 OUTPUT POWER (W)
3
THD+N = 10% THD+N = 1%
2
1
0 1 10 100 1000 LOAD RESISTANCE ()
0 OUTPUT POWER (W)
2.5
4
_______________________________________________________________________________________
3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown
Typical Operating Characteristics (continued)
(VDD = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
MAX9710/MAX9711
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX9710/11 toc19
CROSSTALK vs. FREQUENCY
VIN = 200mVP-P RL = 8
MAX9710/11 toc20
0 VRIPPLE = 200mVP-P -20
0 -20 CROSSTALK (dB) -40 -60 RIGHT TO LEFT -80 -100
PSRR (dB)
-40
-60
-80
LEFT TO RIGHT -100 10 100 1k FREQUENCY (Hz) 10k 100k -120 0.01 0.1 1 FREQUENCY (Hz) 10 100
ENTERING SHUTDOWN
MAX9710/11 toc21
EXITING SHUTDOWN
MAX9710/11 toc22
SHDN
2V/div
SHDN
2V/div
OUT_+ AND OUT_OUT_+ OUT_100ms/div RL = 8 INPUT AC-COUPLED TO GND
1V/div
OUT_+ AND OUT_OUT_+ OUT_100ms/div RL = 8 INPUT AC-COUPLED TO GND
1V/div
200mV/div
200mV/div
ENTERING POWER-DOWN
MAX9710/11 toc23
EXITING POWER-DOWN
MAX9710/11 toc24
VDD
2V/div
VDD
2V/div
OUT_+ AND OUT_OUT_+ OUT_100ms/div RL = 8 INPUT AC-COUPLED TO GND
1V/div
OUT_+ AND OUT_OUT_+ OUT_100ms/div RL = 8 INPUT AC-COUPLED TO GND
1V/div
200mV/div
200mV/div
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5
3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown MAX9710/MAX9711
Typical Operating Characteristics (continued)
(VDD = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
MAX9710 SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9710/11 toc25
MAX9711 SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9710/11 toc26
SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9710/11 toc27
18 16 SUPPLY CURRENT (mA) 14 12 10 8 6 4 TA = -40C TA = +85C TA = +25C
12 10 SUPPLY CURRENT (mA) 8 6 4 2 TA = +25C TA = +85C
1.0
0.8 SUPPLY CURRENT (A) TA = +85C 0.6
TA = +25C
0.4 TA = -40C 0.2
TA = -40C
2 0 4.50 4.75 5.00 5.25 5.50 SUPPLY VOLTAGE (V) 0 4.50 4.75 5.00 5.25 5.50 SUPPLY VOLTAGE (V) 0 4.50 4.75 5.00 5.25 5.50 SUPPLY VOLTAGE (V)
Pin Description
PIN MAX9710 1 2 3, 10, 13, 16 4 5 6, 11, 15, 20 7 8, 18 9 12 14 17 19 -- -- -- -- -- MAX9711 -- 7 -- 9 -- 1, 3 -- 5, 11 -- 8 10 -- -- 2 6 12 4 -- NAME INL BIAS N.C. MUTE INR PGND OUTR+ PVDD OUTRVDD SHDN OUTLOUTL+ IN GND OUTOUT+ EP Left-Channel Input DC Bias Bypass. See BIAS Capacitor section for capacitor selection. No Connection. Not internally connected. Active-High Mute Input Right-Channel Input Power Ground Right-Channel Bridged Amplifier Positive Output Output Amplifier Power Supply Right-Channel Bridged Amplifier Negative Output Power Supply Active-Low Shutdown. Connect SHDN to VDD for normal operation. Left-Channel Bridged Amplifier Negative Output Left-Channel Bridged Amplifier Positive Output Amplifier Input Ground Bridged Amplifier Negative Output Bridged Amplifier Positive Output Exposed Pad. Connect to ground plane. FUNCTION
6
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3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown
Detailed Description
The MAX9710/MAX9711 are 3W BTL speaker amplifiers. The MAX9710 is a stereo speaker amplifier, while the MAX9711 is a mono speaker amplifier. Both devices feature a low-power shutdown mode, MUTE mode, and comprehensive click-and-pop suppression. These devices consist of high output-current op amps configured as BTL amplifiers (see Functional Diagrams). The device gain is set by RF and RIN.
+1 VOUT(P-P)
MAX9710/MAX9711
2 x VOUT(P-P)
-1
VOUT(P-P)
BIAS
These devices operate from a single 5V supply and feature an internally generated, power-supply-independent, common-mode bias voltage of 2.5V referenced to ground. BIAS provides both click-and-pop suppression and sets the DC bias level for the audio outputs. BIAS is internally connected to the noninverting input of each speaker amplifier (see Functional Diagrams). Choose the value of the bypass capacitor as described in the BIAS Capacitor section. No external load should be applied to BIAS. Any load lowers the BIAS voltage, affecting the overall performance of the device.
Figure 1. Bridge-Tied Load Configuration
Applications Information
BTL Amplifier
The MAX9710/MAX9711 are designed to drive a load differentially, a configuration referred to as BTL. The BTL configuration (Figure 1) offers advantages over the single-ended configuration, where one side of the load is connected to ground. Driving the load differentially doubles the output voltage compared to a singleended amplifier under similar conditions. Thus, the differential gain of the device is twice the closed-loop gain of the input amplifier. The effective gain is given by: A VD = 2 x RF RIN
Shutdown
The MAX9710/MAX9711 feature a 0.5A low-power shutdown mode that reduces quiescent current consumption. Pulling SHDN low disables the device's bias circuitry, the amplifier outputs are actively pulled low, and BIAS is driven to GND. Connect SHDN to VDD for normal operation.
MUTE
Both devices feature a clickless/popless MUTE mode. When the device is muted, the input disconnects from the amplifier. MUTE only affects the power amplifiers and does not shut down the device. Drive MUTE high to mute the device. Drive MUTE low for normal operation.
Substituting 2 x VOUT(P-P) for VOUT(P-P) into the following equations yields four times the output power due to doubling of the output voltage: VRMS = VOUT(P-P) 22
Click-and-Pop Suppression
The MAX9710/MAX9711 feature Maxim's comprehensive click-and-pop suppression. During startup, the common-mode bias voltage of the amplifiers slowly ramps to the DC bias point using an S-shaped waveform. When entering shutdown, the amplifier outputs are actively driven low simultaneously. This scheme minimizes the energy present in the audio band. For optimum click-and-pop suppression, choose: RIN x CIN < RBIAS x CBIAS where RBIAS = 50k.
2 V POUT = RMS RL
Since the differential outputs are biased at midsupply, there is no net DC voltage across the load. This eliminates the need for DC-blocking capacitors required for single-ended amplifiers. These capacitors can be large, expensive, consume board space, and degrade low-frequency performance.
_______________________________________________________________________________________
7
3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown MAX9710/MAX9711
Power Dissipation and Heat Sinking
Under normal operating conditions, the MAX9710/ MAX9711 dissipate a significant amount of power. The maximum power dissipation for each package is given in the Absolute Maximum Ratings section under Continuous Power Dissipation or can be calculated by the following equation: PDISSPKG(MAX ) = TJ(MAX ) - TA JA
Input Filter The input capacitor (CIN), in conjunction with RIN, forms a highpass filter that removes the DC bias from an incoming signal. The AC-coupling capacitor allows the amplifier to bias the signal to an optimum DC level. Assuming zero-source impedance, the -3dB point of the highpass filter is given by:
f -3dB = 1 2RINCIN
where TJ(MAX) is +150C, TA is the ambient temperature, and JA is the reciprocal of the derating factor in C/W as specified in the Absolute Maximum Ratings section. For example, JA of the 20-pin thin QFN package is 48.1C/W. The increase in power delivered by the BTL configuration directly results in an increase in internal power dissipation over the single-ended configuration. The maximum power dissipation for a given VDD and load is given by the following equation: PDISS(MAX) = 2VDD2 2RL
For optimum click-and-pop suppression, choose: RIN x CIN < RBIAS x CBIAS where RBIAS = 50k. Setting f -3dB too high affects the low-frequency response of the amplifier. Use capacitors with dielectrics that have low-voltage coefficients, such as tantalum or aluminum electrolytic. Capacitors with highvoltage coefficients, such as ceramics, may result in an increase of distortion at low frequencies.
If the power dissipation for a given application exceeds the maximum allowed for a given package, either reduce VDD, increase load impedance, decrease the ambient temperature, or add heat sinking to the device (see Layout and Grounding section). Large output, supply, and ground PC board traces improve the maximum power dissipation in the package. Thermal-overload protection limits total power dissipation in the MAX9710/MAX9711. When the junction temperature exceeds +160C, the thermal protection circuitry disables the amplifier output stage. The amplifiers are enabled once the junction temperature cools by 15C. A pulsing output under continuous thermal-overload conditions results as the device heats and cools.
BIAS Capacitor BIAS is the output of the internally generated 2.5VDC bias voltage. The BIAS bypass capacitor, C BIAS , improves PSRR and THD+N by reducing power supply and other noise sources at the common-mode bias node, and also generates the clickless/popless startup DC bias waveform for the speaker amplifiers. Bypass BIAS with a 1F capacitor to GND. Smaller values of CBIAS produce faster tON/tOFF times but may result in increased click/pop levels. Supply Bypassing Proper power-supply bypassing ensures low-noise, low-distortion performance. Place a 0.1F ceramic capacitor from V DD to PGND. Add additional bulk capacitance as required by the application. Locate the bypass capacitor as close to the device as possible.
Piezoelectric Speaker Driver
Low-profile piezoelectric speakers can provide quality sound for portable electronics. However, piezoelectric speakers typically require large voltage swings (>8V P-P ) across the speaker element to produce audible sound pressure levels. The MAX9711 can be configured to drive a piezoelectric speaker with up to 10VP-P while operating from a single 5V supply. Figure 2 shows the THD+N of the MAX9711 driving a piezoelectric speaker. Note that as frequency increases, the THD+N increases. This is due to the capacitive nature of the piezoelectric speaker; as frequency increases, the speaker impedance decreases, resulting in a larger current draw from the amplifier.
Component Selection
Gain-Setting Resistors External feedback components set the gain of both devices. Resistors RF and RIN (Functional Diagrams) set the gain of the amplifier as follows:
AVD = 2 x RF RIN
8
_______________________________________________________________________________________
3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown MAX9710/MAX9711
TOTAL HARMONIC DISTORTI0N PLUS NOISE vs. FREQUENCY
10 VOUT = 8VP-P 1
100H AUDIO INPUT 1F 15k 2 IN OUT+ 4 15k
10
THD+N (%)
*
0.1
0.01
OUT12
0.001 0.01 0.1 1 FREQUENCY (Hz) 10 100
MAX9711
*PIEZOELECTRIC
SPEAKER.
Figure 2. MAX9711 Piezoelectric Speaker Driver THD+N vs. Frequency
Figure 3. Isolation Network for Driving a Piezoelectric Speaker
The capacitive nature of the piezoelectric speaker may cause the MAX9711 to become unstable. A simple inductor/resistor network in series with the speaker isolates the speaker capacitance from the driver and ensures that the device output sees a resistive load of about 10 at high frequency, thereby maintaining stability (Figure 3).
5V
PVDD
VDD
Layout and Grounding
Good PC board layout is essential for optimizing performance. Use large traces for the power-supply inputs and amplifier outputs to minimize losses due to parasitic trace resistance and route heat away from the device. Good grounding improves audio performance, minimizes crosstalk between channels, and prevents any digital switching noise from coupling into the audio signal. The MAX9710/MAX9711 thin QFN package features an exposed thermal pad on the underside. This pad lowers the thermal resistance of the package by providing a direct-heat conduction path from the die to the printed circuit board. Connect the exposed pad to the ground plane using multiple vias, if required. For optimum performance, connect to the ground planes as shown in Figure 4.
MAX9710
FOR OPTIMUM PERFORMANCE, AUDIO GND SHOULD HAVE A STAR CONNECTION TO THE HIGH CURRENT, AMPLIFIER PGND AT A SINGLE POINT, PIN 6. PGND
AUDIO SIGNAL GND
Figure 4. MAX9710 Audio Ground Connection
_______________________________________________________________________________________
9
3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown MAX9710/MAX9711
Functional Diagrams
RF 15k CIN 0.1F LEFT AUDIO INPUT
RIN 15k
1 INL OUTL+ 10k 10k 12 VDD 19
4.5V TO 5.5V SUPPLY
0.1F 2,18
PVDD OUTL- 17
2 BIAS CBIAS 1F
BIAS
6, 11, 15, 20 PGND OUTR14 SHDN 4 MUTE 10k 10k OUTR+ 5 INR 7 9
CIN 0.1F RIGHT AUDIO INPUT
RIN 15k
MAX9710
RF 15k
PIN NUMBERS SHOWN ARE FOR THE 20 TQFN-EP PACKAGE.
10
______________________________________________________________________________________
3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown
Functional Diagrams (continued)
RF 15k CIN 0.1F LEFT AUDIO INPUT RIN 15k
MAX9710/MAX9711
2 IN OUT+ 4
4.5V TO 5.5V SUPPLY 8 VDD 0.1F 5,11 PVDD
10k 10k
OUT- 12 10 SHDN 9 MUTE 7 BIAS CBIAS 1F BIAS GND 6 PGND 1, 3
MAX9711
Pin Configurations (continued)
TOP VIEW
OUT12 PVDD 11 SHDN 10
PGND IN PGND
1 2 3
9 8 7
MUTE VDD BIAS
MAX9711
4 OUT+
5 PVDD
6 GND
QFN
______________________________________________________________________________________
11
3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown MAX9710/MAX9711
System Diagram
VDD (5V) 0.1F 15k 0.1F 15k INR VDD PVDD 0.1F AUX_IN 1F OUT 1F SHDN MUTE BIAS OUTR+ OUTR-
MAX9710
MAX4060
BIAS 2.2k 0.1F IN+ IN0.1F CODEC
0.1F 15k INL 15k
OUTLOUTL+
VCC 100k
Q Q
IN-
VDD/2
MAX961
IN+ 100k 0.1F
SHDNL SHDNR 1F INL VCC (3.3V) 1F INR VCC 1F C1P CIN OUTR PVSS SVSS 1F
MAX4411 OUTL
1F
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 20 TQFN-EP 12 TQFN-EP PACKAGE CODE T2055-4 T1244-4 DOCUMENT NO. 21-0140 21-0139
Chip Information
MAX9710 TRANSISTOR COUNT: 1172 MAX9711 TRANSISTOR COUNT: 780 PROCESS: BiCMOS
12
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3W Mono/Stereo BTL Audio Power Amplifiers with Shutdown
Revision History
REVISION NUMBER 0 1 REVISION DATE 4/03 6/08 Initial release Removed TSSOP package DESCRIPTION PAGES CHANGED -- 1, 2, 6, 9, 10
MAX9710/MAX9711
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13
(c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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