MAX9718AETB+-MAX9718AETB+T-MAX9718DETB+T-MAX9718EEBL+TG45-MAX9718HEBL+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX9718EEBL+TG45 ,Low-Cost, Mono/Stereo, 1.4W Differential Audio Power AmplifiersMAX9718/MAX971919-3050; Rev 7; 4/10Low-Cost, Mono/Stereo,1.4W Differential Audio Power Amplifiers
MAX9718HEBL+T ,Low-Cost, Mono/Stereo, 1.4W Differential Audio Power AmplifiersELECTRICAL CHARACTERISTICS—5V Supply (continued)(V = 5V, GND = 0, SHDN/SHDN = V (MAX9718/MAX9719), ..
MAX971CSA ,Ultra-Low-Power, Open-Drain, Single/Dual-Supply ComparatorsFeaturesThe MAX971–MAX974 and MAX981–MAX984 single/' µMAX Package—Smallest 8-Pin SOdual/quad low-vo ..
MAX971CSA ,Ultra-Low-Power, Open-Drain, Single/Dual-Supply Comparatorsapplications, thesedevices operate from a single +2.5V to +11V supply (or' Internal 1.182V ±1% Band ..
MAX971CSA+ ,Ultra-Low-Power, Open-Drain, Single/Dual-Supply ComparatorsApplicationsresistors.Battery-Powered Window ComparatorsThe MAX971–MAX974 and MAX981–MAX984’s open- ..
MAX971CSA+T ,Ultra-Low-Power, Open-Drain, Single/Dual-Supply ComparatorsMAX971–MAX974/MAX981–MAX98419-0450; Rev 3; 2/03Ultra-Low-Power, Open-Drain,Single/Dual-Supply Compa ..
MB89475 ,F2MC-8L/Low Power/Low Voltage Microcontrollersapplications forconsumer product.2* : F MC stands for FUJITSU Flexible Microcontroller.n
MB89535A ,F2MC-8L/Low Power/Low Voltage MicrocontrollersFEATURES• Wide range of package options• Two types of QFP packages (1 mm pitch, 0.65 mm pitch) • LQ ..
MB89535A ,F2MC-8L/Low Power/Low Voltage MicrocontrollersFUJITSU SEMICONDUCTORDS07-12547-4EDATA SHEET8-bit Original Microcontroller CMOS2F MC-8L MB89530A Se ..
MB89537A , 8-bit Original Microcontroller CMOS, F-2MC-8L MB89530A Series
MB89537A , 8-bit Original Microcontroller CMOS, F-2MC-8L MB89530A Series
MB89537AC , 8-bit Original Microcontroller CMOS, F-2MC-8L MB89530A Series

MAX9718AETB+-MAX9718AETB+T-MAX9718DETB+T-MAX9718EEBL+TG45-MAX9718HEBL+T
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 mini-
mizes external component count, while providing high-
quality, power audio amplification. The MAX9718 is a
single-channel amplifier while the MAX9719 is a dual-
channel amplifier for stereo systems. Both devices
deliver 1.4W continuous average power per channel to
a 4Ωload 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 fea-
ture Maxim’s comprehensive click-and-pop suppres-
sion 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 UCSP™, 10-pin TDFN, and
10-pin μMAX®packages. The MAX9719 is available in
16-pin TQFN, 16-pin TSSOP, and 16-bump UCSP pack-
ages. Both devices operate over the -40°C to +85°C
extended temperature range.
Applications
Mobile Phones
PDAs
Portable Devices
Features2.7V to 5.5V Single-Supply OperationVery High -93dB PSRR at 217Hz1.4W into 4Ωat 1% THD+N (per Channel)Differential InputInternal Fixed Gain to Reduce Component CountAdjustable Gain Option (MAX9718A/H/MAX9719A)100nA Low-Power Shutdown ModeNo Audible Clicks or Pops at Power-Up/DownImproved Performance Pin-Compatible Upgrade
to LM4895 (MAX9718D/G)1.8V Logic Compatible
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
Ordering Information
MAX9719
SINGLE SUPPLY
2.7V TO 5.5V
SHDN
INL+
INL-
INR+
INR-
MAX9718
SINGLE SUPPLY
2.7V TO 5.5V
SHDM
SHDN
IN+OUT+
OUT-
OUTR-
OUTR+
OUTL-
OUTL+
IN-
Simplified Block Diagrams
19-3050; Rev 7; 4/10
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
EVALUATION KITAVAILABLE
UCSP is a trademark of Maxim Integrated Products, Inc.
μMAX is a registered trademark of Maxim Integrated Products, Inc.
PARTTEMP RANGEPIN-
PACKAGEO PA R K A X9 7 1 8 AE BL+ TG 45-40°C to +85°C 3 x 3 UCSP+ADX
MAX9718AETB+T-40°C to +85°C10 TDFN-EP*+AAV
+Denotes lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
G45 indicates protective die coating.
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—5V Supply
(VCC= 5V, GND = 0, SHDN/SHDN= VCC(MAX9718/MAX9719), SHDM = GND (MAX9718), RIN= RF= 10kΩ(MAX971_A/H), = +25°C. CBIAS= 0.1μF, no load. Typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
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.
Supply Voltage (VCCto GND)..................................-0.3V to +6V
Any Other Pin to GND ...............................-0.3V to (VCC+ 0.3V)
IN_, BIAS, SHDM, SHDN, SHDNContinuous Current........20mA
OUT_ Short-Circuit Duration to GND or VCC.............Continuous
Continuous Power Dissipation (TA= +70°C)
9-Bump UCSP (derate 5.2mW/°C above +70°C).......1067mW
10-Pin TDFN (derate 24.4mW/°C above +70°C)........1951mW
10-Pin μMAX (derate 10.3mW/°C above +70°C)..........825mW
16-Bump UCSP (derate 8.2mW/°C above +70°C).....1633mW
16-Pin TQFN (derate 16.9mW/°C above +70°C)........1349mW
16-Pin TSSOP (derate 21.3mW/°C above +70°C)......1702mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Supply VoltageVCC2.75.5V
Supply CurrentICCVIN- = VIN+ = VBIAS, TA = -40°C to +85°C,
per amplifier (Note 2)5.07.5mA
Shutdown Supply CurrentISHDNSHDN = SHDM = SHDN = GND, per amplifier0.11μA
VIH0.7 x VCCSHDN, SHDN, SHDM
ThresholdVILMAX9718A/B/C/D0.3 x VCCV
VIH1.4SHDN, SHDN, SHDM
ThresholdVILMAX9718E/F/G/H0.4V
AV = 0dB, MAX971_A/H,
MAX971_B/E±1±10
AV = 3dB, MAX971_C/F±1±15Output Offset VoltageVOSVIN- = VIN+ = VBIAS
AV = 6dB, MAX971_D/G±1±20
AV = 0dB, MAX971_B/E0.5V CC - 0.5
AV = 3dB, MAX971_C/F0.5V CC - 0.6Inferred from
CMRR testAV = 6dB, MAX971_D/G0.5V CC - 0.8Common-Mode Input VoltageVIC
External gain, MAX971_A/H0.5VCC - 1.2
Input ImpedanceRINMAX971_B/E, MAX971_C/F, MAX971_D/G101520kΩ
-50-60Common-Mode Rejection RatioCMRRfN = 1kHz-60dB
f = 217Hz-93
Power-Supply Rejection RatioPSRRIN- = V IN+ = V BIAS,RIPPLE = 200m V P-P,
RL = 8Ω , C BIAS = 1μFf = 1kHz-90
RL = 8Ω0.81.1Output PowerPOUTTHD+N = 1%,
fIN = 1kHz (Note 4)RL = 4Ω1.4W
Total Harmonic Distortion Plus
NoiseTHD+NRL = 8Ω, fIN = 1kHz, POUT = 0.75W,
VCC = 5V, AV = 6dB (Note 5)0.002%
MAX9718/MAX9719
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= 10kΩ(MAX971_A/H), = +25°C. CBIAS= 0.1μF, no load. Typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
ELECTRICAL CHARACTERISTICS—3V Supply
(VCC= 3V, GND = 0, SHDN/SHDN= VCC(MAX9718/MAX9719), SHDM = GND (MAX9718), RIN= RF= 10kΩ(MAX971_A/H), = +25°C. CBIAS= 0.1μF, no load. Typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Gain AccuracyMAX971_B/E, MAX971_C/F, MAX971_D/G±1%
Channel-to-Channel Gain
MatchingMAX9719B/E, MAX9719C/F, MAX9719D/G±1%
Signal-to-Noise RatioSNRPOUT = 1W, RL = 8Ω-104dB
Thermal-Shutdown Threshold+160°C
Thermal-Shutdown Hysteresis15°C
Maximum Capacitive DriveCLOADBridge-tied capacitance500pF
Power-Up/Enable from
Shutdown TimetPU10ms
Shutdown TimetSHDN3.5μs
Turn-Off TransientVPOP(Note 6)50mV
CrosstalkMAX9719, fIN = 1kHz-85dB
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Supply CurrentICCVIN- = VIN+ = VBIAS, TA = -40°C to +85°C,
per amplifier (Note 2)3.86.0mA
Shutdown Supply CurrentISHDNSHDN = SHDM = SHDN = GND, per amplifier0.11μA
VIH0.7 x V CCSHDN, SHDN, SHDM
ThresholdVIL0.3 x V CCV
Common-Mode Bias VoltageVBIAS(Note 3)VCC/2
- 5%VCC/2VCC/2
+ 5%V
AV = 0dB, MAX971_A/H
MAX971_B/E±1±10
AV = 3dB, MAX971_C/F±1±15Output Offset VoltageVOSVIN- = VIN+ = VBIAS
AV = 6dB, MAX971_D/G±1±20
AV = 0dB, MAX971_B/E0.5V CC - 0.7
AV = 3dB, MAX971_C/F0.5V CC - 0.8Inferred from
CMRR test
AV = 6dB, MAX971_D/G0.5V CC - 1.0Common-Mode Input VoltageVIC
External gain, MAX971_A/H0.5V CC - 1.2
Input ImpedanceRINMAX971_B/E, MAX971_C/F, MAX971_D/G101520kΩ
-50-60Common-Mode Rejection RatioCMRRfN = 1kHz-70dB
f = 217Hz-93
Power-Supply Rejection RatioPSRRIN- = V IN+ = V BIAS,RIPPLE = 200m V P-P,
RL = 8Ω ,BIAS = 1μFf = 1kHz-90
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9718 toc01
FREQUENCY (Hz)
THD+N (%)
1001k10k
0.0001100k
OUTPUT POWER = 1W
OUTPUT POWER = 50mW
VCC = 5V
RL = 4Ω
AV = 2
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9718 toc02
THD+N (%)
1001k10k
0.0001100k
VCC = 5V
RL = 4Ω
AV = 4
OUTPUT POWER = 1W
OUTPUT POWER = 200mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9718 toc03
THD+N (%)
1001k10k
0.0001100k
VCC = 5V
RL = 8Ω
AV = 2
OUTPUT POWER = 250mW
OUTPUT POWER = 750mW
Typical Operating Characteristics
(VCC= 5V, CBIAS= 0.1μF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
Note 1:All specifications are 100% tested at TA= +25°C. Specifications over temperature (TA= TMINto 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. VCCrise and fall times greater than or equal to 1ms.
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
ELECTRICAL CHARACTERISTICS—3V Supply (continued)
(VCC= 3V, GND = 0, SHDN/SHDN= VCC(MAX9718/MAX9719), SHDM = GND (MAX9718), RIN= RF= 10kΩ(MAX971_A/H), = +25°C. CBIAS= 0.1μF, no load. Typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Output PowerPOUTRL = 8Ω, THD+N = 1%, fIN = 1kHz (Note 4)475mW
Total Harmonic Distortion Plus
NoiseTHD+NRL = 8Ω, fIN = 1kHz, POUT = 0.25W,
AV = 6dB0.003%
Thermal-Shutdown Threshold+160°C
Thermal-Shutdown Hysteresis15°C
Maximum Capacitive DriveCLOADBridge-tied capacitance500pF
Power-Up/Enable from
Shutdown TimetPU10ms
Shutdown TimetSHDN3μs
Turn-Off TransientVPOP(Note 6)40mV
CrosstalkMAX9719, fIN = 1kHz-85dB
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9718 toc04
FREQUENCY (Hz)
THD+N (%)
1001k10k
0.0001100k
VCC = 5V
RL = 8Ω
AV = 4
OUTPUT POWER = 200mW
OUTPUT POWER = 800mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9718 toc05
FREQUENCY (Hz)
THD+N (%)
1001k10k
0.0001100k
VCC = 3V
RL = 4Ω
AV = 2
OUTPUT POWER = 250mW
OUTPUT POWER = 50mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9718 toc06
FREQUENCY (Hz)
THD+N (%)
1001k10k
0.0001100k
VCC = 3V
RL = 4Ω
AV = 4
OUTPUT POWER = 70mW
OUTPUT POWER = 175mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9718 toc07
FREQUENCY (Hz)
THD+N (%)
1001k10k
0.0001100k
VCC = 3V
RL = 8Ω
AV = 2
OUTPUT POWER = 250mW
OUTPUT POWER = 100mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
MAX9718 toc08
FREQUENCY (Hz)
THD+N (%)
1001k10k
0.0001100k
VCC = 3V
RL = 8Ω
AV = 4
OUTPUT POWER = 200mW
OUTPUT POWER = 50mW
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9718 toc09
OUTPUT POWER (W)
THD+N (%)
fIN = 1kHz
fIN = 100Hz
fIN = 10kHz
VCC = 5V
RL = 4Ω
AV = 2
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9718 toc10
OUTPUT POWER (W)
THD+N (%)
fIN = 1kHz
fIN = 100Hz
fIN = 10kHz
VCC = 5V
RL = 4Ω
AV = 4
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9718 toc11
OUTPUT POWER (W)
THD+N (%)
fIN = 1kHz
fIN = 100HzfIN = 10kHz
VCC = 5V
RL = 8Ω
AV = 2
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9718 toc12
OUTPUT POWER (W)
THD+N (%)
fIN = 100Hz
fIN = 1kHz
fIN = 10kHz
VCC = 5V
RL = 8Ω
AV = 4
Typical Operating Characteristics (continued)
(VCC= 5V, CBIAS= 0.1μF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9718 toc13
OUTPUT POWER (mW)
THD+N (%)
fIN = 10kHz
fIN = 1kHzfIN = 100Hz
VCC = 3V
RL = 4Ω
AV = 2
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9718 toc14
OUTPUT POWER (mW)
THD+N (%)
fIN = 1kHz
fIN = 100Hz
fIN = 10kHz
VCC = 3V
RL = 4Ω
AV = 4
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9718 toc15
OUTPUT POWER (mW)
THD+N (%)
fIN = 1kHz
fIN = 100Hz
fIN = 10kHz
VCC = 3V
RL = 8Ω
AV = 2
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER
MAX9718 toc16
OUTPUT POWER (mW)
THD+N (%)
fIN = 1kHz
fIN = 100Hz
fIN = 10kHz
VCC = 3V
RL = 8Ω
AV = 4
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. COMMON-MODE VOLTAGE
MAX9718 toc17
COMMON-MODE VOLTAGE (V)
THD+N (%)452
VCC = 5V
PO = 200mW
AV = 2
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. COMMON-MODE VOLTAGE
MAX9718 toc18
COMMON-MODE VOLTAGE (V)
THD+N (%)
VCC = 3V
PO = 200mW
AV = 2
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9718 toc19
SUPPLY VOLTAGE (V)
OUTPUT POWER
RL = 4Ω
f = 1kHz
AV = 2
THD+N = 10%
THD+N = 1%
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9718 toc20
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
RL = 8Ω
f = 1kHz
AV = 2
THD+N = 10%
THD+N = 1%
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9718 toc21
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
VCC = 5V
f = 1kHz
AV = 2
THD+N = 10%
THD+N = 1%
Typical Operating Characteristics (continued)
(VCC= 5V, CBIAS= 0.1μF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX9718/MAX9719
GAIN AND PHASE
vs. FREQUENCY
MAX9718 toc27
FREQUENCY (Hz)
GAIN/PHASE (
°/dB)
10k1k100
-150100k
AV = 60dB
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9718 toc22
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
THD+N = 10%
THD+N = 1%
VCC = 3V
f = 1kHz
AV = 2
POWER DISSIPATION
vs. OUTPUT POWER
MAX9718 toc23
OUTPUT POWER (W)
POWER DISSIPATION (W)
VCC = 5V
RL = 4Ω
f = 1kHz
AV = 2
POWER DISSIPATION
vs. OUTPUT POWER
MAX9718 toc24
OUTPUT POWER (W)
POWER DISSIPATION (W)
VCC = 5V
RL = 8Ω
f = 1kHz
AV = 2
POWER DISSIPATION
vs. OUTPUT POWER
MAX9718 toc25
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
VCC = 3V
RL = 4Ω
f = 1kHz
AV = 2
POWER DISSIPATION
vs. OUTPUT POWER
MAX9718 toc26
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
VCC = 3V
RL = 8Ω
f = 1kHz
AV = 2
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9718 toc28
PSRR (dB)
10k1k100
-100100k
VRIPPLE = 200mVP-P
RL = 8Ω
CBIAS = 1μF
VCC = 5V
VCC = 3V
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX9718 toc29
FREQUENCY (Hz)
CMRR (dB)
10k1k100
-100100k
VRIPPLE = 200mVP-P
RL = 8Ω
CBIAS = 1μF
VCC = 5V
VCC = 3V
Typical Operating Characteristics (continued)
(VCC= 5V, CBIAS= 0.1μF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
Typical Operating Characteristics (continued)
(VCC= 5V, CBIAS= 0.1μF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
CROSSTALK
vs. FREQUENCY
MAX9718 toc31
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-120100k
CHANNEL 2
CHANNEL 1
VCC = 3V
VRIPPLE = 200mVP-P
RL = 8Ω
CBIAS = 1μF
ENTERING SHUTDOWN
MAX9718 toc32
100μs/div
CBIAS = 0.1μF
VCC = 3V
RL = 8ΩSHDN
2V/div
OUT+
1V/div
OUT-
1V/div
OUT+ - OUT-
200mV/div
EXITING SHUTDOWN
MAX9718 toc33
4ms/div
CBIAS = 0.1μF
VCC = 3V
RL = 8Ω
SHDN
2V/div
OUT+
1V/div
OUT-
1V/div
OUT+ - OUT-
200mV/div
ENTERING POWER-DOWN
MAX9718 toc34
100μs/div
CBIAS = 0.1μF
VCC = 3V
RL = 8ΩSHDN
1V/div
OUT+
1V/div
OUT-
1V/div
OUT+ - OUT-
200mV/div
EXITING POWER-DOWN
MAX9718 toc35
SHDN
2V/div
OUT+
1V/div
OUT-
1V/div
4ms/div
CBIAS = 0.1μF
VCC = 3V
RL = 8Ω
OUT+ - OUT-
200mV/div
CROSSTALK
vs. FREQUENCY
MAX9718 toc30
FREQUENCY (Hz)
CROSSTALK (dB)
10k1k100
-120100k
CHANNEL 2
CHANNEL 1
VCC = 5V
VRIPPLE = 200mVP-P
RL = 8Ω
CBIAS = 1µF
MAX9718/MAX9719
TURN-ON TIME
vs. DC BIAS BYPASS CAPACITOR
MAX9718 toc38
CBIAS (μF)
TURN-ON TIME (ms)
VCC = 5V
VCC = 3V
TO -3dB OF FINAL VALUE
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX9718 toc37
TEMPERATURE (°C)
SHUTDOWN CURRENT (3510-15
VCC = 5V
VCC = 3V
Typical Operating Characteristics (continued)
(VCC= 5V, CBIAS= 0.1μF, THD+N measurement bandwidth = 22Hz to 22kHz, TA= +25°C, unless otherwise noted.)
Pin Description
PIN
MAX9718MAX9719
TDFN-EP/
µMAXUCSPTQFN-EPUCSPTSSOP-EP
NAMEFUNCTIONC2———SHDNShutdown Input. The polarity of SHDN is dependent on the
state of SHDM.9B311SHDNShutdown Input. Active-low shutdown input.C1———IN-Inverting InputB2———SHDM
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).A1———IN+Noninverting InputA25B27BIASDC Bias BypassA3———OUT-Bridge Amplifier Negative OutputB31, 6, 11A2, C2,3, 8, 13GNDGround—13—15N.C.No Connection. Not internally connected.B18, 14A4, D316, 10VCCPower SupplyC3———OUT+Bridge Amplifier Positive Output—2C14INR+Right-Channel Noninverting Input—3B15INL-Left-Channel Inverting Input—4A16INL+Left-Channel Noninverting Input—7A39OUTL+Left-Channel Bridge Amplifier Positive Output
SUPPLY CURRENT
vs. TEMPERATURE
MAX9718 toc36
TEMPERATURE (°C)
SUPPLY CURRENT (mA)3510-15
VCC = 5V
VCC = 3V
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
Pin Description (continued)
PIN
TDFN-EP/
µMAXUCSPTQFN-EPUCSPTSSOP-EPNAMEFUNCTION—10B412OUTL-Left-Channel Bridge Amplifier Negative Output—12D414OUTR+Right-Channel Bridge Amplifier Positive Output—15D21OUTR-Right-Channel Bridge Amplifier Negative Output—16D12INR-Right-Channel Inverting Input———EPExposed Pad. Connect EP to GND.
Detailed Description
The MAX9718/MAX9719 are 1.4W BTL speaker ampli-
fiers. The MAX9718 is a mono speaker amplifier, while
the MAX9719 is a stereo speaker amplifier. Both
devices feature a low-power shutdown mode and indus-
try-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.
BIAS
These devices operate from a single 2.7V to 5.5V sup-
ply and feature an internally generated, common-mode
bias voltage of VCC/2 referenced to ground. BIAS pro-
vides 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 con-
sumption. Entering shutdown disables the device’s bias
circuitry, the amplifier outputs go high impedance, and
BIAS is driven to GND. The MAX9718 SHDM input con-
trols the polarity of SHDN. Drive SHDM high for an
active-high SHDN input. Drive SHDM low for an active-
low 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-lead-
ing 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 100kΩbetween both
outputs. This scheme minimizes the energy present in
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.
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:
Since the differential outputs are biased at midsupply,
there is no net DC voltage across the load. This elimi-
nates 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.VOUTRMSV
RMS
OUTPP=−()
SHDMSHDNOPERATIONAL MODE0Shutdown1Normal operation0Normal operation1Shutdown
Table 1. Shutdown Mode Selection
(MAX9718 Only)
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:
where TJ(MAX)is +150°C, TAis the ambient tempera-
ture, and θJAis the reciprocal of the derating factor in
°C/W as specified in the Absolute Maximum Ratings
section. For example, θJAof the TQFN package is
+59.2°C/W.
The increase in power delivered by the BTL configura-
tion directly results in an increase in internal power dis-
sipation over the single-ended configuration. The
maximum internal power dissipation for a given VCC
and load is given by the following equation:
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 ambi-
ent temperature, reduce gain, or reduce input signal.
Thermal-overload protection limits total power dissipa-
tion in the MAX9718/MAX9719. When the junction tem-
perature exceeds +160°C, the thermal protection
circuitry disables the amplifier output stage. The ampli-
fiers are enabled once the junction temperature cools
by 15°C. A pulsing output under continuous thermal
overload results as the device heats and cools.
For optimum power dissipation and heat sinking, con-
nect the exposed pad found on the µMAX, TDFN,
TQFN, and TSSOP packages to a large ground plane.
Fixed Differential Gain
The MAX9718B/E, MAX9718C/F, MAX9718D/G,
MAX9719B, MAX9719C, and MAX9719D feature inter-
nally fixed gains (see the Selector Guide). This simpli-
fies design, decreases required footprint size, and
eliminates external gain-setting resistors. Resistors R1
and R2shown in the Functional Diagramsare used to
achieve each fixed gain.
Adjustable Differential Gain
Gain-Setting Resistors
External feedback resistors set the gain of the
MAX9718A/H and MAX9719A. Resistors RFand RIN
(Figure 2) set the gain of the amplifier as follows:
where AVis the desired voltage gain. Hence, an RINof
10kΩand an RFof 20kΩyields a gain of 2V/V, or 6dB.can be either fixed or variable, allowing the use of a
digitally controlled potentiometer to alter the gain under
software control.RVFVDMAXCC=22πTT
DMAX
JMAXA=
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power AmplifiersVOUT(P-P)
2 x VOUT(P-P)
VOUT(P-P)-1
Figure 1. Bridge-Tied Load Configuration
MAX9718A/H
MAX9719A
BIAS
GENERATOR
INVERTING
DIFFERENTIAL
INPUT
NONINVERTING
DIFFERENTIAL
INPUT(OPTIONAL)
(OPTIONAL)
IN+
IN-
OUT+
OUT-
RIN
RIN
Figure 2. Setting the MAX9718A/H/MAX9719A Gain
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 Characteristicstable.
If input capacitors are used, 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 sig-
nal to an optimum DC level. Assuming zero-source
impedance, the -3dB point of the highpass filter is
given by:
Setting f-3dBtoo 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 high-
voltage 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, CBIAS,
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 0.1µF capacitor to GND. Larger values of
CBIAS(up to 1µF) improve PSRR, but slow down
tON/tOFFtimes. A 1µF CBIAScapacitor 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 1µF ceramic
capacitor from VCCto 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 perfor-
mance. 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
µMAX 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 tech-
niques, bump-pad layout, and recommended reflow tem-
perature profile, as well as the latest information on
reliability testing results, refer to the Application Note
1891: Wafer-Level Packaging (WLP) and Its Applications.RCdBIN=31
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
PARTMONOSTEREOGAIN
(dB)
SELECTABLE
SHUTDOWN
POLARITY
MAX9718A/H√—Adjustable√
MAX9718B/E√—0√
MAX9718C/F√—3√
MAX9718D/G√—6√
MAX9719A—√Adjustable—
MAX9719B—√0—
MAX9719C—√3—
MAX9719D—√6—
Selector Guide
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
PARTTEMP RANGEPIN-
PACKAGEO PA R K
MAX9718AEUB+-40°C to +85°C10 µM AX - E P *+AAAAAX 9718BE BL+ TG45-40°C to +85°C 3 x 3 U C S P +ADX
MAX9718BETB+T-40°C to +85°C10 TD FN - E P *+AAW
MAX9718BEUB+-40°C to +85°C10 µM AX - E P *+AAABAX 9718C E BL+ TG45-40°C to +85°C 3 x 3 U C S P +ADZ
MAX9718CETB+T-40°C to +85°C10 TD FN - E P *+AAX
MAX9718CEUB+-40°C to +85°C10 µM AX - E P *+AAACAX 9718D E BL+ TG45-40°C to +85°C 3 x 3 U C S P +AEA
MAX9718DETB+T-40°C to +85°C10 TD FN - E P *+AAY
MAX9718DEUB+-40°C to +85°C10 µM AX - E P *+AAADAX 9718E E BL+ TG45-40°C to +85°C 3 x 3 U C S P +AFB
MAX9718EETB+T-40°C to +85°C10 TD FN - E P *+ASY
MAX9718EEUB+-40°C to +85°C10 µM AX - E P *+AAAJAX 9718FE BL+ TG45-40°C to +85°C 3 x 3 U C S P +AFC
MAX9718FETB+T-40°C to +85°C10 TD FN - E P *+ASZ
MAX9718FEUB+-40°C to +85°C10 µM AX - E P *+AAAKAX 9718G E BL+ TG45-40°C to +85°C 3 x 3 U C S P +AFD
MAX9718GETB+T-40°C to +85°C10 TD FN - E P *+ATA
PARTTEMP RANGEPIN-
PACKAGEO PA R K
MAX9718GEUB+-40°C to +85°C10 µM AX - E P *+AAALAX 9718H E BL+ TG45-40°C to +85°C 3 x 3 U C S P +AFE
MAX9718HETB+T-40°C to +85°C10 TD FN - E P *+ATB
MAX9718HEUB+-40°C to +85°C10 µM AX - E P *+AAAM
MAX9719AEBE+T-40°C to +85°C 4 x 4 U C S P —
MAX9719AETE+-40°C to +85°C16 TQ FN - E P *—
MAX9719AEUE+-40°C to +85°C16 TS S O P - E P *—AX 9719BE BE + TG45-40°C to +85°C 4 x 4 U C S P —
MAX9719BETE+-40°C to +85°C16 TQ FN - E P *—
MAX9719BEUE+-40°C to +85°C16 TS S O P - E P *—AX 9719C E BE + TG45-40°C to +85°C 4 x 4 U C S P —
MAX9719CETE+-40°C to +85°C16 TQ FN - E P *—
MAX9719CEUE+-40°C to +85°C16 TS S O P - E P *—AX 9719D E BE + TG45-40°C to +85°C 4 x 4 U C S P —
MAX9719DETE+-40°C to +85°C16 TQ FN - E P *—
MAX9719DEUE+-40°C to +85°C16 TS S O P - E P *—
Ordering Information (continued)
Chip Information
MAX9718 TRANSISTOR COUNT: 2359
MAX9719 TRANSISTOR COUNT: 4447
PROCESS: BiCMOS
UCSPMarking Information
AAA
XXX
■: A1 Bump indicator
AAA: Product code
XXX: Lot code
+Denotes lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
G45 indicates protective die coating.
MAX9718/MAX9719
Low-Cost, Mono/Stereo,
1.4W Differential Audio Power Amplifiers
INL+
INL-
INR+
INR-
IN1+
IN1-
IN2+
IN2-
GND
SHDN
OUTL+
OUTL-
OUTR+
OUTR-
BIAS
1μF10μF
MAX9719
VCC
INL
AUTOMATIC HEADPHONE DETECTION AND SPEAKER DISABLE CIRCUIT
C1PCIN
IN+
2.7V TO 5.5V
2.7V TO 5.5V
VCC
OUTR
2.7V TO 5.5V
SVSS
1μFMAX9722B
MAX961
OUTL
SHDN
PVSS
SVDD
PVDD
INR
1μF
1μF0.1μF1μF
0.1μF
1μF
0.1μF0.1μF
220kΩ
IN-
System Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX9718AETB+	MAXIM	N/a	45500	avai	Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers
MAX9718AETB+T \|MAX9718AETBT	MAXIM	N/a	559	avai	Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers
MAX9718DETB+T	MAX	N/a	10000	avai	Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers
MAX9718EEBL+TG45	MAXIM	N/a	50000	avai	Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers
MAX9718HEBL+T	MAXIM	N/a	50000	avai	Low-Cost, Mono/Stereo, 1.4W Differential Audio Power Amplifiers