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19-3050; Rev 0; 10/03
Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers
General Description
The MAX9718/MAX9719 differential input audio power amplifiers are ideal for portable audio devices with internal speakers. The differential input structure improves noise rejection and provides common-mode rejection. A bridge-tied load (BTL) architecture minimizes external component count, while providing highquality, power audio amplification. The MAX9718 is a single-channel amplifier while the MAX9719 is a dualchannel amplifier for stereo systems. Both devices deliver 1.4W continuous average power per channel to a 4 load with less than 1% THD+N while operating from a single +5V supply. The devices are available as adjustable gain amplifiers or with internally fixed gains of 0dB, 3dB, and 6dB to reduce component count. A shutdown input disables the bias generator and amplifiers and reduces quiescent current consumption to less than 100nA. The MAX9718 shutdown input can be set as active high or active low. These devices feature Maxim's comprehensive click-and-pop suppression circuitry that reduces audible clicks and pops during startup and shutdown. The MAX9718 is pin compatible with the LM4895, and is available in 9-bump UCSPTM, 10-pin TDFN, and 10-pin MAX packages. The MAX9719 is available in 16-pin TQFN, 16-pin TSSOP, and 16-bump UCSP packages. Both devices operate over the -40C to +85C extended temperature range. o Very High -93dB PSRR at 217Hz o 1.4W into 4 at 1% THD+N (per Channel) o Differential Input o Internal Fixed Gain to Reduce Component Count o Adjustable Gain Option (MAX9718A/MAX9719A) o 100nA Low-Power Shutdown Mode o No Audible Clicks or Pops at Power-Up/Down o Improved Performance Pin-Compatible Upgrade to LM4895 (MAX9718D)
Features
o 2.7V to 5.5V Single-Supply Operation
MAX9718/MAX9719
Ordering Information
PART TEMP RANGE PINPACKAGE GAIN (dB) Adj Adj Adj
MAX9718AEBL-T* -40C to +85C 3 x 3 UCSP MAX9718AETB* MAX9718AEUB -40C to +85C 10 TDFN-EP** -40C to +85C 10 MAX-EP**
*Future product--contact factory for availability. **EP = Exposed paddle. Ordering Information continued at end of data sheet. Pin Configurations appear at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc.
Applications
Mobile Phones PDAs Portable Devices
Simplified Block Diagram
SINGLE SUPPLY 2.7V TO 5.5V SINGLE SUPPLY 2.7V TO 5.5V INL+ IN+ OUT+ INLINR+ OUTLOUTR+
OUTL+
INSHDN
OUT-
INRSHDM
MAX9718
SHDN
OUTR-
MAX9719
________________________________________________________________ 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.
Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to GND) ..................................-0.3V to +6V Any Other Pin to GND ...............................-0.3V to (VCC + 0.3V) IN_, BIAS, SHDM, SHDN, SHDN Continuous Current ........20mA OUT_ Short-Circuit Duration to GND or VCC .............Continuous Continuous Power Dissipation (TA = +70C) 9-Bump UCSP (derate 5.2mW/C above +70C)..........412mW 10-Pin TDFN (derate 24.4mW/C above +70C) ........1951mW 10-Pin MAX (derate 10.3mW/C above +70C) ..........825mW 16-Bump UCSP (derate 8.2mW/C above +70C) .......659mW 16-Pin TQFN (derate 16.9mW/C above +70C) ........1349mW 16-Pin TSSOP (derate 21.3mW/C above +70C) ......1702mW Operating Temperature Range ...........................-40C to +85C Junction Temperature .....................................................+150C Storage Temperature Range .............................-65C to +150C Bump Temperature (soldering) Reflow............................+235C 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--5V Supply
(VCC = 5V, GND = 0, SHDN/SHDN = VCC (MAX9718/MAX9719), SHDM = GND (MAX9718), RIN = RF = 10k (MAX971_A), TA = +25C. CBIAS = 0.1F, no load. Typical values are at TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Supply Voltage Supply Current Shutdown Supply Current SHDN, SHDN, SHDM Threshold Common-Mode Bias Voltage SYMBOL VCC ICC ISHDN VIH VIL VBIAS (Note 3) AV = 0dB, MAX971_A, MAX971_B Output Offset Voltage VOS VIN- = VIN+ = VBIAS AV = 3dB, MAX971_C AV = 6dB, MAX971_D Inferred from CMRR test AV = 0dB, MAX971_B AV = 3dB, MAX971_C AV = 6dB, MAX971_D External gain, MAX971_A Input Impedance Common-Mode Rejection Ratio RIN CMRR MAX971_B, MAX971_C, MAX971_D fn = 1kHz VIN- = VIN+ = VBIAS, VRIPPLE = 200mVP-P, RL = 8, CBIAS = 1F THD+N = 1%, fIN = 1kHz (Note 4) f = 217Hz f = 1kHz RL = 8 RL = 4 0.8 0.5 0.5 0.5 0.5 10 -50 15 -60 -60 -93 dB -90 1.1 1.4 0.002 W % VCC/2 - 5% VCC/2 1 1 1 VIN- = VIN+ = VBIAS, TA = -40C to +85C, per amplifier (Note 2) SHDN = SHDM = SHDN = GND, per amplifier 0.7 x VCC 0.3 x VCC VCC/2 + 5% 10 15 20 VCC - 0.5 VCC - 0.6 VCC - 0.8 VCC - 1.2 20 k dB V mV CONDITIONS MIN 2.7 5.0 0.1 TYP MAX 5.5 7.5 1 UNITS V mA A V V
Common-Mode Input Voltage
VIC
Power-Supply Rejection Ratio
PSRR
Output Power Total Harmonic Distortion Plus Noise
POUT THD+N
RL = 8, fIN = 1kHz, POUT = 0.75W, VCC = 5V, AV = 6dB (Note 5)
2
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers
ELECTRICAL CHARACTERISTICS--5V Supply (continued)
(VCC = 5V, GND = 0, SHDN/SHDN = VCC (MAX9718/MAX9719), SHDM = GND (MAX9718), RIN = RF = 10k (MAX971_A), TA = +25C. CBIAS = 0.1F, no load. Typical values are at TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Gain Accuracy Channel-to-Channel Gain Matching Signal-to-Noise Ratio Thermal-Shutdown Threshold Thermal-Shutdown Hysteresis Maximum Capacitive Drive Power-Up/Enable from Shutdown Time Shutdown Time Turn-Off Transient Crosstalk CLOAD tPU tSHDN VPOP (Note 6) MAX9719, fIN = 1kHz Bridge-tied capacitance SNR SYMBOL CONDITIONS MAX971_B/MAX971_C/MAX971_D MAX9719B/MAX9719C/MAX9719D POUT = 1W, RL = 8 -104 +160 15 500 10 3.5 50 -85 MIN TYP MAX 1 1 UNITS % % dB C C pF ms s mV dB
MAX9718/MAX9719
ELECTRICAL CHARACTERISTICS--3V Supply
(VCC = 3V, GND = 0, SHDN/SHDN = VCC (MAX9718/MAX9719), SHDM = GND (MAX9718), RIN = RF = 10k (MAX971_A), TA = +25C. CBIAS = 0.1F, no load. Typical values are at TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Supply Current Shutdown Supply Current SHDN, SHDN, SHDM Threshold Common-Mode Bias Voltage SYMBOL ICC ISHDN VIH VIL VBIAS (Note 3) AV = 0dB, MAX971_A/ MAX971_B Output Offset Voltage VOS VIN- = VIN+ = VBIAS AV = 3dB, MAX971_C AV = 6dB, MAX971_D Inferred from CMRR test AV = 0dB, MAX971_B AV = 3dB, MAX971_C AV = 6dB, MAX971_D External gain, MAX971_A Input Impedance Common-Mode Rejection Ratio RIN CMRR MAX971_B/MAX971_C/MAX971_D fN = 1kHz VIN- = VIN+ = VBIAS, VRIPPLE = 200mVP-P, RL = 8, CBIAS = 1F f = 217Hz f = 1kHz 0.5 0.5 0.5 0.5 10 -50 15 -60 -70 -93 dB -90 VCC/2 - 5% VCC/2 1 1 1 CONDITIONS VIN- = VIN+ = VBIAS, TA = -40C to +85C, per amplifier (Note 2) SHDN = SHDM = SHDN = GND, per amplifier 0.7 x VCC 0.3 x VCC VCC/2 + 5% 10 15 20 VCC - 0.7 VCC - 0.8 VCC - 1.0 VCC - 1.2 20 k dB V mV MIN TYP 3.8 0.1 MAX 6.0 1 UNITS mA A V V
Common-Mode Input Voltage
VIC
Power-Supply Rejection Ratio
PSRR
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
ELECTRICAL CHARACTERISTICS--3V Supply (continued)
(VCC = 3V, GND = 0, SHDN/SHDN = VCC (MAX9718/MAX9719), SHDM = GND (MAX9718), RIN = RF = 10k (MAX971_A), TA = +25C. CBIAS = 0.1F, no load. Typical values are at TA = +25C, unless otherwise noted.) (Note 1)
PARAMETER Output Power Total Harmonic Distortion Plus Noise Thermal-Shutdown Threshold Thermal-Shutdown Hysteresis Maximum Capacitive Drive Power-Up/Enable from Shutdown Time Shutdown Time Turn-Off Transient Crosstalk CLOAD tPU tSHDN VPOP (Note 6) MAX9719, fN = 1kHz Bridge-tied capacitance SYMBOL POUT THD+N CONDITIONS RL = 8, THD+N = 1%, fIN = 1kHz (Note 4) RL = 8, fIN = 1kHz, POUT = 0.25W, AV = 6dB MIN TYP 475 0.003 +160 15 500 10 3 40 -85 MAX UNITS mW % C C pF ms s mV dB
Note 1: All specifications are 100% tested at TA = +25C. Specifications over temperature (TA = TMIN to TMAX) are guaranteed by design, not production tested. Note 2: Quiescent power-supply current is specified and tested with no load. Quiescent power-supply current depends on the offset voltage when a practical load is connected to the amplifier. Guaranteed by design. Note 3: Common-mode bias voltage is the voltage on BIAS and is nominally VCC/2. Note 4: Output power is specified by a combination of a functional output current test and characterization analysis. Note 5: Measurement bandwidth for THD+N is 22Hz to 22kHz. Note 6: Peak voltage measured at power-on, power-off, into or out of SHDN. Bandwidth defined by A-weighted filters, inputs at AC GND. VCC rise and fall times greater than or equal to 1ms.
Typical Operating Characteristics
(VCC = 5V, CBIAS = 0.1F, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION + NOISE vs. FREQUENCY
MAX9718 toc01
TOTAL HARMONIC DISTORTION + NOISE vs. FREQUENCY
MAX9718 toc02
TOTAL HARMONIC DISTORTION + NOISE vs. FREQUENCY
VCC = 5V RL = 8 AV = 2
MAX9718 toc03
10 VCC = 5V RL = 4 AV = 2
10 VCC = 5V RL = 4 AV = 4 OUTPUT POWER = 1W
10
1
1
1
THD+N (%)
THD+N (%)
0.1
OUTPUT POWER = 1W
0.1
THD+N (%)
0.1 OUTPUT POWER = 750mW 0.01
0.01 OUTPUT POWER = 50mW 0.001
0.01 OUTPUT POWER = 200mW 0.001
0.001
OUTPUT POWER = 250mW
0.0001 10 100 1k FREQUENCY (Hz) 10k 100k
0.0001 10 100 1k FREQUENCY (Hz) 10k 100k
0.0001 10 100 1k FREQUENCY (Hz) 10k 100k
4
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers
Typical Operating Characteristics (continued)
(VCC = 5V, CBIAS = 0.1F, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
MAX9718/MAX9719
TOTAL HARMONIC DISTORTION + NOISE vs. FREQUENCY
MAX9718 toc04
TOTAL HARMONIC DISTORTION + NOISE vs. FREQUENCY
MAX9718 toc05
TOTAL HARMONIC DISTORTION + NOISE vs. FREQUENCY
VCC = 3V RL = 4 AV = 4 OUTPUT POWER = 175mW
MAX9718 toc06
10 VCC = 5V RL = 8 AV = 4
10 VCC = 3V RL = 4 AV = 2
10
1
1
1
THD+N (%)
THD+N (%)
THD+N (%)
0.1
OUTPUT POWER = 800mW
0.1
OUTPUT POWER = 50mW
0.1
0.01 OUTPUT POWER = 200mW
0.01 OUTPUT POWER = 250mW
0.01 OUTPUT POWER = 70mW
0.001
0.001
0.001
0.0001 10 100 1k FREQUENCY (Hz) 10k 100k
0.0001 10 100 1k FREQUENCY (Hz) 10k 100k
0.0001 10 100 1k FREQUENCY (Hz) 10k 100k
TOTAL HARMONIC DISTORTION + NOISE vs. FREQUENCY
MAX9718 toc07
TOTAL HARMONIC DISTORTION + NOISE vs. FREQUENCY
MAX9718 toc08
TOTAL HARMONIC DISTORTION + NOISE vs. OUTPUT POWER
VCC = 5V RL = 4 AV = 2
MAX9718 toc09
10 VCC = 3V RL = 8 AV = 2
10 VCC = 3V RL = 8 AV = 4
100
1
1
10
THD+N (%)
THD+N (%)
0.1 OUTPUT POWER = 100mW 0.01
0.1
THD+N (%)
OUTPUT POWER = 50mW
1 fIN = 10kHz 0.1 fIN = 100Hz
0.01 OUTPUT POWER = 200mW
0.001 OUTPUT POWER = 250mW 0.0001 10 100 1k FREQUENCY (Hz) 10k 100k
0.001
0.01
fIN = 1kHz
0.0001 10 100 1k FREQUENCY (Hz) 10k 100k
0.001 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION + NOISE vs. OUTPUT POWER
MAX9718 toc10
TOTAL HARMONIC DISTORTION + NOISE vs. OUTPUT POWER
MAX9718 toc11
TOTAL HARMONIC DISTORTION + NOISE vs. OUTPUT POWER
VCC = 5V RL = 8 AV = 4
MAX9718 toc12
100 VCC = 5V RL = 4 AV = 4
100 VCC = 5V RL = 8 AV = 2
100
10
10
10
THD+N (%)
THD+N (%)
THD+N (%)
1 fIN = 100Hz 0.1 fIN = 10kHz
1
fIN = 1kHz
1
fIN = 100Hz fIN = 1kHz fIN = 10kHz
0.1 fIN = 100Hz fIN = 10kHz
0.1
0.01
fIN = 1kHz
0.01
0.01
0.001 0 0.5 1.0 OUTPUT POWER (W) 1.5 2.0
0.001 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 OUTPUT POWER (W)
0.001 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 OUTPUT POWER (W)
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
Typical Operating Characteristics (continued)
(VCC = 5V, CBIAS = 0.1F, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION + NOISE vs. OUTPUT POWER
MAX9718 toc13
TOTAL HARMONIC DISTORTION + NOISE vs. OUTPUT POWER
MAX9718 toc14
TOTAL HARMONIC DISTORTION + NOISE vs. OUTPUT POWER
VCC = 3V RL = 8 AV = 2
MAX9718 toc15
100 VCC = 3V RL = 4 AV = 2 fIN = 10kHz
100 VCC = 3V RL = 4 AV = 4
100
10
10
10
THD+N (%)
THD+N (%)
1
1 fIN = 10kHz fIN = 1kHz 0.01 fIN = 100Hz
THD+N (%)
1
0.1 fIN = 1kHz 0.01 fIN = 100Hz
0.1
0.1 fIN = 1kHz 0.01 fIN = 100Hz 0.001 fIN = 10kHz
0.001 0 100 200 300 400 500 600 OUTPUT POWER (mW)
0.001 0 100 200 300 400 500 600 OUTPUT POWER (mW)
0
100
200
300
400
500
600
OUTPUT POWER (mW)
TOTAL HARMONIC DISTORTION + NOISE vs. OUTPUT POWER
MAX9718 toc16
TOTAL HARMONIC DISTORTION + NOISE vs. COMMON-MODE VOLTAGE
VCC = 5V PO = 200mW AV = 2
MAX9718 toc17
TOTAL HARMONIC DISTORTION + NOISE vs. COMMON-MODE VOLTAGE
VCC = 3V PO = 200mW AV = 2
MAX9718 toc18
100 VCC = 3V RL = 8 AV = 4
0.01
0.01
10
THD+N (%)
1
fIN = 1kHz fIN = 10kHz
THD+N (%)
THD+N (%)
0.001
0.001
0.1
0.01 fIN = 100Hz 0.001 0 100 200 300 400 500 OUTPUT POWER (mW) 0.0001 0 1 2 3 4 5 COMMON-MODE VOLTAGE (VRMS) 0.0001 0 0.5 1.0 1.5 2.0 2.5 3.0 COMMON-MODE VOLTAGE (VRMS)
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9718 toc19
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9718 toc20
OUTPUT POWER vs. LOAD RESISTANCE
1.8 1.6 OUTPUT POWER (W) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 THD+N = 1% THD+N = 10% VCC = 5V f = 1kHz AV = 2
MAX9718 toc21
2.5
2.0 OUTPUT POWER
RL = 4 f = 1kHz AV = 2
1.8 1.6 1.4 OUTPUT POWER (W) 1.2 1.0 0.8 0.6 0.4 0.2 THD+N = 1% RL = 8 f = 1kHz AV = 2 THD+N = 10%
2.0
1.5
THD+N = 10%
1.0 THD+N = 1% 0.5
0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
1
10 LOAD RESISTANCE ()
100
6
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers
Typical Operating Characteristics (continued)
(VCC = 5V, CBIAS = 0.1F, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
MAX9718/MAX9719
OUTPUT POWER vs. LOAD RESISTANCE
MAX9718 toc22
POWER DISSIPATION vs. OUTPUT POWER
1.6 POWER DISSIPATION (W) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 VCC = 5V RL = 4 f = 1kHz AV = 2
MAX9718 toc23
POWER DISSIPATION vs. OUTPUT POWER
VCC = 5V RL = 8 f = 1kHz AV = 2
MAX9718 toc24
600 500 OUTPUT POWER (mW) 400 300 THD+N = 1% 200 100 0 1 10 LOAD RESISTANCE () VCC = 3V f = 1kHz AV = 2 THD+N = 10%
1.8
1.0
POWER DISSIPATION (W)
0.8
0.6
0.4
0.2
0 100 0 0.3 0.6 0.9 1.2 1.5 1.8 OUTPUT POWER (W)
0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 OUTPUT POWER (W)
POWER DISSIPATION vs. OUTPUT POWER
MAX9718 toc25
POWER DISSIPATION vs. OUTPUT POWER
MAX9718 toc26
OUTPUT NOISE vs. FREQUENCY
120 90 OUTPUT NOISE (dB) 60 30 0 -30 -60 -90 AV = 2
MAX9718 toc27
700 600 POWER DISSIPATION (mW) 500 400 300 200 100 0 0
POWER DISSIPATION (mW)
VCC = 3V RL = 4 f = 1kHz AV = 2
350 300 250 200 150 100 50 0
VCC = 3V RL = 8 f = 1kHz AV = 2
150
-120 -150 0 100 200 300 400 500 10 100 1k FREQUENCY (Hz) 10k 100k OUTPUT POWER (mW)
100
200
300
400
500
600
700
OUTPUT POWER (mW)
GAIN AND PHASE vs. FREQUENCY
MAX9718 toc28
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX9718 toc29
COMMON-MODE REJECTION RATIO vs. FREQUENCY
-10 -20 -30 CMRR (dB) -40 -50 -60 -70 -80 VCC = 3V VCC = 5V VRIPPLE = 200mVP-P RL = 8 CBIAS = 1F
MAX9718 toc30
150 120 90 GAIN/PHASE (/dB) 60
AV = 60dB
0 -10 -20 -30 PSRR (dB) -40 -50 -60 -70 -80 -90 -100
VRIPPLE = 200mVP-P RL = 8 CBIAS = 1F
0
30 0 -30 -60 -90 -120 -150 10 100 1k FREQUENCY (Hz) 10k 100k
VCC = 5V
VCC = 3V 10 100 1k FREQUENCY (Hz) 10k 100k
-90 -100 10 100 1k FREQUENCY (Hz) 10k 100k
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
Typical Operating Characteristics (continued)
(VCC = 5V, CBIAS = 0.1F, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
CROSSTALK vs. FREQUENCY
MAX9718 toc31
CROSSTALK vs. FREQUENCY
-10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 10 100 VCC = 3V VRIPPLE = 200mVP-P RL = 8 CBIAS = 1F
MAX9718 toc32
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 10 100 VCC = 5V VRIPPLE = 200mVP-P RL = 8, CBIAS = 1F
0
CROSSTALK (dB)
CHANNEL 2
CROSSTALK (dB)
CHANNEL 2
CHANNEL 1
CHANNEL 1
1k FREQUENCY (Hz)
10k
100k
1k FREQUENCY (Hz)
10k
100k
ENTERING SHUTDOWN
MAX9718 toc33
EXITING SHUTDOWN
MAX9718 toc34
CBIAS = 0.1F VCC = 3V RL = 8
SHDN 2V/div OUT+ 1V/div OUT1V/div OUT+ - OUT200mV/div
CBIAS = 0.1F VCC = 3V RL = 8
SHDN 2V/div OUT+ 1V/div OUT1V/div
OUT+ - OUT200mV/div 4ms/div
100s/div
ENTERING POWER-DOWN
MAX9718 toc35
EXITING POWER-DOWN
MAX9718 toc36
CBIAS = 0.1F VCC = 3V RL = 8
SHDN 1V/div OUT+ 1V/div OUT1V/div OUT+ - OUT200mV/div CBIAS = 0.1F VCC = 3V RL = 8 4ms/div
SHDN 2V/div OUT+ 1V/div OUT1V/div OUT+ - OUT200mV/div
100s/div
8
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers
Typical Operating Characteristics (continued)
(VCC = 5V, CBIAS = 0.1F, THD+N measurement bandwidth = 22Hz to 22kHz, TA = +25C, unless otherwise noted.)
MAX9718/MAX9719
SUPPLY CURRENT vs. TEMPERATURE
MAX9718 toc37
SHUTDOWN CURRENT vs. TEMPERATURE
MAX9718 toc38
TURN-ON TIME vs. DC BIAS BYPASS CAPACITOR
TO -3dB OF FINAL VALUE 70 VCC = 5V TURN-ON TIME (ms) 60 50 40 30 20 VCC = 3V
MAX9718 toc39
6 5 SUPPLY CURRENT (mA) 4 3 2 1 0 -40 -15 10 35 60 VCC = 3V VCC = 5V
0.03 0.02 SHUTDOWN CURRENT (A) VCC = 5V 0.01 0 -0.01 -0.02 -0.03 VCC = 3V
80
10 0 -40 -15 10 35 60 85 0 0.20 0.40 0.60 0.80 1.00 TEMPERATURE (C) CBIAS (F)
85
TEMPERATURE (C)
Pin Description
PIN MAX9718 TDFN/ MAX 1 -- 2 3 4 5 6 7 8 9 10 -- -- -- -- -- UCSP C2 -- C1 B2 A1 A2 A3 B3 -- B1 C3 -- -- -- -- -- TQFN -- 9 -- -- -- 5 -- 1, 6, 11 13 8, 14 -- 2 3 4 7 10 MAX9719 UCSP -- B3 -- -- -- B2 -- A2, C2, C4 -- A4, D3 -- C1 B1 A1 A3 B4 TSSOP -- 11 -- -- -- 7 -- 3, 8,13 15 16, 10 -- 4 5 6 9 12 SHDN SHDN INSHDM IN+ BIAS OUTGND N.C. VCC OUT+ INR+ INLINL+ OUTL+ OUTLShutdown Input. The polarity of SHDN is dependent on the state of SHDM. Shutdown Input. Active-low shutdown input. Inverting Input Shutdown-Mode Polarity Input. SHDM controls the polarity of SHDN. Connect SHDM high for an active-high SHDN input. Connect SHDM low for an active-low SHDN input (see Table 1). Noninverting Input DC Bias Bypass Bridge Amplifier Negative Output Ground No Connection. Not internally connected. Power Supply Bridge Amplifier Positive Output Right-Channel Noninverting Input Left-Channel Inverting Input Left-Channel Noninverting Input Left-Channel Bridge Amplifier Positive Output Left-Channel Bridge Amplifier Negative Output NAME FUNCTION
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
Pin Description (continued)
PIN MAX9718 TDFN/ MAX -- -- -- EP UCSP -- -- -- -- TQFN 12 15 16 EP MAX9719 UCSP D4 D2 D1 -- TSSOP 14 1 2 EP OUTR+ OUTRINREP Right-Channel Bridge Amplifier Positive Output Right-Channel Bridge Amplifier Negative Output Right-Channel Noninverting Input Exposed Pad. Connect EP to GND. NAME FUNCTION
Detailed Description
The MAX9718/MAX9719 are 1.4W BTL speaker amplifiers. The MAX9718 is a mono speaker amplifier, while the MAX9719 is a stereo speaker amplifier. Both devices feature a low-power shutdown mode, and industry-leading click-and-pop suppression. The MAX9718 features a two-input shutdown scheme to configure shutdown for active high or active low. These devices consist of high output-current audio amps configured as BTL amplifiers (see the Functional Diagrams). Both adjustable and fixed gain (0dB, 3dB, 6dB) versions are available.
Table 1. Shutdown Mode Selection (MAX9718 Only)
SHDM 0 0 1 1 SHDN 0 1 0 1 OPERATIONAL MODE Shutdown Normal operation Normal operation Shutdown
Applications Information
BTL Amplifier
The MAX9718/MAX9719 are designed to drive a load differentially, a configuration referred to as bridge-tied load or 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 single-ended 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: R A VD = 2 x F RIN 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
BIAS
These devices operate from a single 2.7V to 5.5V supply and feature an internally generated, common-mode bias voltage of VCC / 2 referenced to ground. BIAS provides both click-and-pop suppression and sets the DC bias level for the audio outputs. Choose the value of the bypass capacitor as described in the BIAS Capacitor section. Do not connect external loads to BIAS as this can affect the overall performance.
Shutdown Mode
The MAX9718/MAX9719 feature a 100nA low-power shutdown mode that reduces quiescent current consumption. Entering shutdown disables the device's bias circuitry, the amplifier outputs go high impedance, and BIAS is driven to GND. The MAX9718 SHDM input controls the polarity of SHDN. Drive SHDM high for an active-high SHDN input. Drive SHDM low for an activelow SHDN input (see Table 1). The MAX9719 features an active-low shutdown input, SHDN.
Click-and-Pop Suppression
The MAX9718/MAX9719 feature Maxim's industry-leading click-and-pop suppression circuitry. During startup, the amplifier common-mode bias voltage ramps to the DC bias point. When entering shutdown, the amplifier outputs are high impedance to 100k between both outputs. This scheme minimizes the energy present in the audio band.
10
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
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
RF
+1
VOUT(P-P)
RF
2 x VOUT(P-P)
INVERTING DIFFERENTIAL INPUT RIN (OPTIONAL) IN-
MAX9718A MAX9719A
-1
VOUT(P-P)
OUT+ BIAS GENERATOR OUT-
Figure 1. Bridge-Tied Load Configuration
single-ended amplifiers. These capacitors can be large, expensive, consume board space, and degrade low-frequency performance.
RIN NONINVERTING DIFFERENTIAL INPUT (OPTIONAL)
IN+
Power Dissipation and Heat Sinking
Under normal operating conditions, the MAX9718/ MAX9719 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: TJ(MAX) - TA PDISSPKG(MAX) = JA 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 TQFN package is +59.2C/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 internal power dissipation for a given VCC and load is given by the following equation: PDISSPKG(MAX) = 2VCC2 2RL
Figure 2. Setting the MAX9718A/MAX9719A Gain
circuitry disables the amplifier output stage. The amplifiers are enabled once the junction temperature cools by 15C. A pulsing output under continuous thermal overload results as the device heats and cools. For optimum power dissipation and heat sinking, connect the exposed pad found on the MAX, TDFN, TQFN, and TSSOP packages to a large ground plane.
Fixed Differential Gain
The MAX9718B, MAX9718C, MAX9718D, MAX9719B, MAX9719C, and MAX9719D feature internally fixed gains (see the Selector Guide). This simplifies design, decreases required footprint size, and eliminates external gain-setting resistors. Resistors R1 and R2 shown in the Typical Operating Circuit are used to achieve each fixed gain.
Adjustable Differential Gain
Gain-Setting Resistors External feedback resistors set the gain of the MAX9718A and MAX9719A. Resistors R F and R IN (Figure 2) set the gain of the amplifier as follows: R AV = F RIN where AV is the desired voltage gain. Hence, an RIN of 10k and an RF of 20k yields a gain of 2V/V, or 6dB. RF can be either fixed or variable, allowing the use of a digitally controlled potentiometer to alter the gain under software control.
If the internal power dissipation for a given application exceeds the maximum allowed for a given package, reduce power dissipation by increasing the ground plane heat-sinking capability and the size of the traces to the device (see the Layout and Grounding section). Other methods for reducing power dissipation are to reduce VCC, increase load impedance, decrease ambient temperature, reduce gain, or reduce input signal. Thermal-overload protection limits total power dissipation in the MAX9718/MAX9719. When the junction temperature exceeds +160C, the thermal protection
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
Input Filter The fully differential amplifier inputs can be biased at voltages other than midsupply. The common-mode feedback circuit adjusts for input bias, ensuring the outputs are still biased at midsupply. Input capacitors are not required as long as the common-mode input voltage is within the specified range listed in the Electrical Characteristics table. If input capacitors are used, input capacitor CIN, in conjunction with R IN , forms a highpass filter that removes the DC bias from an incoming signal. The ACcoupling 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: 1 f -3dB = 2RINCIN 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, can increase distortion at low frequencies. BIAS Capacitor BIAS is the output of the internally generated VCC / 2 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 0.1F capacitor to GND. Larger values of C BIAS (up to 1F) improve PSRR, but slow down tON/tOFF times. A 1F CBIAS capacitor slows turn-on and turn-off times by 10 and improves PSRR by 20dB (at 1kHz). Do not connect external loads to BIAS. Supply Bypassing Proper power-supply bypassing ensures low-noise, low-distortion performance. Connect a 1F ceramic capacitor from V CC to GND. Add additional bulk capacitance as required by the application. Locate the bypass capacitor as close to the device as possible.
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 MAX9718/MAX9719 TDFN, TQFN, TSSOP, and MAX packages feature exposed thermal pads on their undersides. This pad lowers the thermal resistance of the package by providing a direct-heat conduction path from the die to the PC board. Connect the exposed pad to the ground plane using multiple vias, if required.
UCSP Applications Information
For the latest application details on UCSP construction, dimensions, tape carrier information, PC board techniques, bump-pad layout, and recommended reflow temperature profile, as well as the latest information on reliability testing results, refer to the Application Note: UCSP--A Wafer-Level Chip-Scale Package available on Maxim's website at www.maxim-ic.com/ucsp.
Selector Guide
PART MONO -- -- -- -- STEREO GAIN (dB) Adjustable 0 3 6 Adjustable 0 3 6 SELECTABLE SHUTDOWN POLARITY -- -- -- --
MAX9718A MAX9718B MAX9718C MAX9718D MAX9719A MAX9719B MAX9719C MAX9719D
-- -- -- --
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
Ordering Information (continued)
PART TEMP RANGE PINPACKAGE GAIN (dB) 0 0 0 3 3 3 6 6 6 Adj Adj Adj 0 0 0 3 3 3 6 6 6
UCSP Marking Information:
AAA XXX
MAX9718BEBL-T* -40C to +85C 3 x 3 UCSP MAX9718BETB MAX9718BEUB MAX9718CETB MAX9718CEUB MAX9718DETB MAX9718DEUB MAX9719AETE MAX9719AEAE* MAX9719BETE MAX9719BEAE* MAX9719CETE MAX9719CEAE* MAX9719DETE MAX9719DEAE* -40C to +85C 10 TDFN-EP** -40C to +85C 10 MAX-EP** -40C to +85C 10 TDFN-EP** -40C to +85C 10 MAX-EP** -40C to +85C 10 TDFN-EP** -40C to +85C 10 MAX-EP** -40C to +85C 16 TQFN-EP** -40C to +85C 16 TSSOP-EP** -40C to +85C 16 TQFN-EP** -40C to +85C 16 TSSOP-EP** -40C to +85C 16 TQFN-EP** -40C to +85C 16 TSSOP-EP** -40C to +85C 16 TQFN-EP** -40C to +85C 16 TSSOP-EP**
I: A1 Bump indicator AAA: Product code XXX: Lot code
MAX9718CEBL-T* -40C to +85C 3 x 3 UCSP
MAX9718DEBL-T* -40C to +85C 3 x 3 UCSP
Chip Information
MAX9718 TRANSISTOR COUNT: 2359 MAX9719 TRANSISTOR COUNT: 4447 PROCESS: BiCMOS
MAX9719AEBE-T* -40C to +85C 4 x 4 UCSP
MAX9719BEBE-T* -40C to +85C 4 x 4 UCSP
MAX9719CEBE-T* -40C to +85C 4 x 4 UCSP
MAX9719DEBE-T* -40C to +85C 4 x 4 UCSP
*Future product--contact factory for availability. **EP = Exposed paddle.
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
System Diagram
2.7V TO 5.5V
10F
1F VCC
MAX9719
IN1+ IN1IN2+ IN2INL+ INLINR+ OUTR+ INROUTRGND SHDN BIAS 0.1F 2.7V TO 5.5V OUTL+ OUTL-
Q
MAX961
Q IN-
VCC IN+ 0.1F 0.1F
220k
SHDN
1F INL 1F INR 2.7V TO 5.5V PVDD SVDD 1F 0.1F
MAX9722B
OUTL OUTR PVSS SVSS C1P CIN 1F
1F AUTOMATIC HEADPHONE DETECTION AND SPEAKER DISABLE CIRCUIT
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
Functional Diagrams
2.7V TO 5.5V SUPPLY VCC 1.0F INVERTING DIFFERENTIAL INPUT NONINVERTING DIFFERENTIAL INPUT CIN (OPTIONAL) CIN (OPTIONAL) BIAS CBIAS 0.1F SHDN SHDM GND RF RF 2.7V TO 5.5V SUPPLY VCC 1.0F INVERTING DIFFERENTIAL INPUT NONINVERTING DIFFERENTIAL INPUT CIN (OPTIONAL) CIN (OPTIONAL) BIAS CBIAS 0.1F MAX9718A AV = 2 fC = 1Hz CIN = 10F RIN = 10k RF = 20k SHDN SHDM GND SHUTDOWN CONTROL BIAS GENERATOR RIN IN+ OUTRIN SHUTDOWN CONTROL BIAS GENERATOR IN+ R1 R2 OUTR1 OUT+ R2 IN-
MAX9718B MAX9718C MAX9718D
INOUT+
MAX9718A
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
Functional Diagrams (continued)
2.7V TO 5.5V SUPPLY VCC 1.0F INVERTING DIFFERENTIAL INPUT NONINVERTING DIFFERENTIAL INPUT CIN (OPTIONAL) CIN (OPTIONAL) BIAS CBIAS 0.1F BIAS GENERATOR SHUTDOWN CONTROL R1 OUTR+ (OPTIONAL) CIN (OPTIONAL) INR+ GND RF RF 2.7V TO 5.5V SUPPLY VCC 1.0F INVERTING DIFFERENTIAL INPUT NONINVERTING DIFFERENTIAL INPUT CIN (OPTIONAL) CIN (OPTIONAL) BIAS CBIAS 0.1F INVERTING DIFFERENTIAL INPUT NONINVERTING DIFFERENTIAL INPUT CIN (OPTIONAL) CIN (OPTIONAL) RIN INR+ GND RF RF OUTRRIN SHDN BIAS GENERATOR SHUTDOWN CONTROL RIN INL+ OUTLRIN R1 R2 OUTRINL+ R1 R2 OUTL-
MAX9719B MAX9719C MAX9719D
R1
R2
INL-
OUTL+
SHDN
R2
INVERTING DIFFERENTIAL INPUT NONINVERTING DIFFERENTIAL INPUT
CIN
INR-
MAX9719A
INLOUTL+
INROUTR+
MAX9719A AV = 2 fC = 1Hz CIN = 10F RIN = 10k RF = 20k
16
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
Pin Configurations
TOP VIEW TOP VIEW (BUMPS ON BOTTOM)
1 SHDN 1 INSHDM IN+ BIAS 2 3 4 5 MAX9718 10 OUT+ 9 8 7 6 VCC N.C. GND OUTC INSHDN OUT+ B VCC SHDM GND A IN+ 2 BIAS
MAX9718 3 OUT-
MAX
3 x 3 UCSP
TOP VIEW
TOP VIEW (BUMPS ON BOTTOM)
1 SHDN 1 INSHDM IN+ BIAS 2 3 4 5 MAX9718 10 OUT+ 9 VCC 8 N.C. 7 GND 6 OUTC INR+ GND B INLBIAS SHDN A INL+ 2 GND 3 OUTL+
MAX9719 4 VCC
OUTL-
GND
3mm x 3mm x 0.8mm TDFN
D
INR-
OUTR-
VCC
OUTR+
4 x 4 UCSP TOP VIEW
INR-
OUTR-
TOP VIEW
N.C. 13 VCC 14
16
15
OUTR- 1 12 OUTR+ 11 GND INR- 2 GND 3
16 VCC 15 N.C. 14 OUTR+ MAX9719 13 GND 12 OUTL11 SHDN 10 VCC 9 OUTL+
GND INR+ INLINL+
1 2
INR+ 4 INL- 5 INL+ 6
MAX9719
3 4 5 BIAS 6 GND 7 OUTL+ 8 VCC 10 OUTL9 SHDN
BIAS 7 GND 8
TSSOP-EP
4mm x 4mm x 0.8mm TQFN
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
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.)
18
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers
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.)
6, 8, &10L, DFN THIN.EPS
MAX9718/MAX9719
L D A A2
PIN 1 ID
D2
1
N
1
b
PIN 1 INDEX AREA
C0.35 [(N/2)-1] x e REF. e
E
DETAIL A
E2
A1
k
C L
C L
L e A e
L
SEMICONDUCTOR
PROPRIETARY INFORMATION TITLE:
DALLAS
PACKAGE OUTLINE, 6, 8 & 10L, TDFN, EXPOSED PAD, 3x3x0.80 mm
NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY
APPROVAL DOCUMENT CONTROL NO. REV.
1 2
21-0137
D
COMMON DIMENSIONS SYMBOL A D E A1 L k A2 MIN. 0.70 2.90 2.90 0.00 0.20 MAX. 0.80 3.10 3.10 0.05 0.40
0.25 MIN. 0.20 REF.
PACKAGE VARIATIONS PKG. CODE T633-1 T833-1 T1033-1 N 6 8 10 D2 1.50-0.10 1.50-0.10 1.50-0.10 E2 2.30-0.10 2.30-0.10 2.30-0.10 e 0.95 BSC 0.65 BSC 0.50 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEC MO229 / WEED-3 b 0.40-0.05 0.30-0.05 0.25-0.05 [(N/2)-1] x e 1.90 REF 1.95 REF 2.00 REF
SEMICONDUCTOR
PROPRIETARY INFORMATION TITLE:
DALLAS
PACKAGE OUTLINE, 6, 8 & 10L, TDFN, EXPOSED PAD, 3x3x0.80 mm
APPROVAL DOCUMENT CONTROL NO. REV.
2 2
21-0137
D
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
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.)
10L UMAX, EXPPADS.EPS
20
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers
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.)
16L,UCSP.EPS
MAX9718/MAX9719
PACKAGE OUTLINE, 4x4 UCSP 21-0101 G
1 1
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Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers MAX9718/MAX9719
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.)
PACKAGE OUTLINE 12,16,20,24L QFN THIN, 4x4x0.8 mm
21-0139
A
PACKAGE OUTLINE 12,16,20,24L QFN THIN, 4x4x0.8 mm
21-0139
A
22
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24L QFN THIN.EPS
Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers
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.)
TSSOP 4.4mm BODY.EPS
MAX9718/MAX9719
PACKAGE OUTLINE, TSSOP, 4.40 MM BODY EXPOSED PAD
21-0108
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 23 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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