MAX9791AETI+ Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX9791AETI+
Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers
General Description
The MAX9791 combines a stereo 2W Class D power
amplifier, a stereo 180mW DirectDrive®headphone
amplifier, and a 120mA low-dropout (LDO) linear regu-
lator in a single device. The MAX9792 combines a
mono 3W Class D power amplifier, a stereo 180mW
DirectDrive headphone amplifier, and a 120mA LDO
linear regulator in a single device.
The MAX9791/MAX9792 feature Maxim’s DirectDrive
headphone amplifier architecture that produces a
ground-referenced output from a single supply, eliminat-
ing the need for large DC-blocking capacitors, saving
cost, board space, and component height. High 107dB
DC PSRR and low 0.006% THD+N ensure clean, low-
distortion amplification of the audio signal.
The ground sense feature senses and corrects for the
voltage difference between the output jack ground and
device signal ground. This feature minimizes head-
phone amplifier crosstalk by sensing the impedance in
the ground return trace and correcting for it at the out-
put jack. This feature also minimizes ground-loop noise
when the output socket is used as a line out connection
to other grounded equipment (for example, a PC con-
nected to a home hi-fi system).
The MAX9791/MAX9792 feature low RF susceptibility,
allowing the amplifiers to successfully operate in close
proximity to wireless applications. The MAX9791/
MAX9792 Class D amplifiers feature Maxim’s spread-
spectrum modulation and active emissions limiting cir-
cuitry. Industry-leading click-and-pop suppression
eliminates audible transients during power-up and shut-
down cycles.
The MAX9791/MAX9792 wake-on-beep feature wakes
up the speaker and headphone amplifiers when a qual-
ified beep signal is detected at the BEEP input.
For maximum flexibility, separate speaker and head-
phone amplifier control inputs provide independent
shutdown of the speaker and headphone amplifiers.
Additionally the LDO can be enabled independently of
the audio amplifiers.
The MAX9791/MAX9792 feature thermal-overload and
output short-circuit protection. The devices are avail-
able in 28-pin TQFN packages and are specified over
the -40°C to +85°C extended temperature range.
Applications
Notebook Computers
Tablet PCs
Portable Multimedia Players
FeaturesWindows Vista®Premium CompliantLow EMI Filterless Class D Speaker Amplifiers
Pass EN55022B Emissions Limit with 30cm of
Speaker Cable 180mW DirectDrive Headphone Amplifier Excellent RF ImmunityIntegrated 120mA LDOEliminates Headphone Ground Loop NoiseWake-on-Beep FunctionClick-and-Pop SuppressionShort-Circuit and Thermal-Overload ProtectionThermally Efficient, Space-Saving Package
28-Pin TQFN-EP (4mm x 4mm x 0.75mm)
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
19-4217; Rev 1; 6/10
Ordering Information
PARTSTEREO/
MONO
LDO
OUTPUTPIN-PACKAGE
MAX9791AETI+ Stereo 4.75V 28 TQFN-EP*
MAX9791BETI+ Stereo 3.3V 28 TQFN-EP*
MAX9791CETI+ Stereo 1.8V 28 TQFN-EP*
MAX9792AETI+Mono 4.75V 28 TQFN-EP*
MAX9792CETI+Mono 1.8V 28 TQFN-EP*
Note:All devices are specified over the -40°C to +85°C
extended temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
MAX9791
SPKR_EN
HP_EN
LDO_EN
BEEP
SPEAKER AND LDO
SUPPLY
2.7V TO 5.5V
HEADPHONE SUPPLY
2.7V TO 5.5V
AVDD
LDO1.8V, 3.3V, OR 4.75V
CLASS D
AMP
CLASS D
AMP
Simplified Block Diagrams
Simplified Block Diagrams continued at end of data sheet.
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2µF (CLDO= 4µF for 1.8V LDO option),=C2 = 1µF. RL= ∞, unless otherwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF,
CIN2=CCOM= 1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
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
(AVDD, PVDD, HPVDD to GND)........................-0.3V to +6.0V
(AVDD to PVDD).............................................................±0.3V
GND to PGND, CPGND......................................................±0.3V
CPVSS, C1N to GND............................................-6.0V to + 0.3V
HPL, HPR to CPVSS...........................................-0.3V to lower of
(HPVDD - CPVSS + 0.3V) and +9V
HPL, HPR to HPVDD..................................+0.3V to the higher of
(CPVSS - HPVDD - 0.3V) and -9V
COM, SENSE........................................................-0.3V to + 0.3V
Any Other Pin..........................................-0.3V to (AVDD + 0.3V)
Duration of Short Circuit between OUT_+, OUT_- and GND,
PGND, AVDD, or PVDD..........................................Continuous
Duration of Short Circuit between LDO_OUT and AVDD,
GND (Note 1).........................................................Continuous
Duration of Short Circuit between HPR, HPL and
GND.......................................................................Continuous
Continuous Current (PVDD, OUT_+, OUT_-, PGND)............1.7A
Continuous Current (C1N, C1P, CPVSS, AVDD, HPVDD,
LDO_OUT, HPR, HPL)..................................................850mA
Continuous Input Current (All Other Pins)........................±20mA
Continuous Power Dissipation (TA= +70°C)
28-Pin Thin QFN Single-Layer Board (derate 20.8mW/°C
above +70°C)..........................................................1667mW
Junction-to-Ambient Thermal Resistance (θJA)
(Note 2).....................................................................40°C/W
Junction-to-Case Thermal Resistance (θJC)
(Note 2)....................................................................2.7°C/W
28-Pin Thin QFN Multilayer Board (derate 28.6mW/°C
above +70°C)..........................................................2286mW
Junction-to-Ambient Thermal Resistance (θJA)
(Note 2).....................................................................35°C/W
Junction-to-Case Thermal Resistance (θJC)
(Note 2)....................................................................2.7°C/W
ESD Protection, Human Body Model...................................±2kV
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
GENERAL
Supply Voltage VAVDD,
VPVDD Guaranteed by PSRR test (Note 4) 2.7 5.5 V
Headphone Supply Voltage VHPVDD Guaranteed by PSRR test 2.7 5.5 V
Undervoltage Lockout UVLO 2.65 V
SPKR_EN HP_EN LDO_EN
1 0 1 250 400 µA
1 1 0 4.4 6
0 0 0 10.5 15
MAX9791
0 1 0 14.4 21
mA
1 0 1 250 400 µA
1 1 0 4.4 6
0 0 0 10.5 18
Quiescent Current
IAVDD +
IPVD +
IHPVDD
MAX9792
0 1 0 14.4 24
mA
Shutdown Current ISHDN SPKR_EN = 1.8V 3.3 7..3 µA
Bias Voltage VBIAS HP_INR, HP_INL, SPKR_INR, SPKR_INL 0 V
Note 1:If short is present at power-up.
Note 2:Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to /thermal-tutorial.
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Shutdown to Full Operation tON 0.4 ms
Overtemperature Threshold +150 °C
SPEAKER AMPLIFIER
RL = 4
(MAX9791) 1.7
RL = 8
(MAX9791) 1.2
THD+N = 1%,
f = 1kHz,
TA = +25°C
(Note 5) RL = 3
(MAX9792) 3
RL = 4
(MAX9791) 2.2
RL = 8
(MAX9791) 1.5
Output Power POUT
THD+N = 10%,
f = 1kHz,
TA = +25°C
(Note 5) RL = 3
(MAX9792) 3.7
RL = 8, POUT = 500mW, f = 1kHz (Note 5) 0.04 Total Harmonic Distortion Plus
Noise THD+N RL = 4, POUT = 500mW, f = 1kHz (Note 5) 0.03 %
VAVDD = VPVDD = 2.7V to 5.5V, TA = +25°C 60 80
f = 217Hz, 200mVP-P 73
f = 1kHz, 200mVP-P 75 Power-Supply Rejection Ratio PSRR
f = 10kHz, 200mVP-P 62
dB
Feedback Impedance RFSKR Guaranteed by design 20 k
Gain AV RIN1 = 20k 12 dB
Output Offset Voltage VOS Measured between OUT_+ and OUT_-,
TA = +25°C ±3 ±10 mV
Into shutdown -52.4
Click-and-Pop Level KCP
RL = 8,
peak voltage,
A-weighted,
32 samples per second
(Notes 5, 6, and 7)
Out of
shutdown -54
dBV
A-weighted 98
Signal-to-Noise Ratio SNR
RL = 8
POUT = 1.2W fIN = 1kHz,
(Note 5) 20Hz to 20kHz 94
dB
Noise VN A-weighted 38 µVRMS
L to R, R to L, RL = 8, VIN = -20dBFS =
100mVRMS, fIN = 1kHz (Note 5) 78
L to R, R to L, RL = 8, VIN = -20dBFS =
100mVRMS, fIN = 15kHz (Note 5) 70 Crosstalk
HP to SPKR, RLSPKR = 8, PHP = 20mW, 77
dB
ELECTRICAL CHARACTERISTICS (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2µF (CLDO= 4µF for 1.8V LDO option),=C2 = 1µF. RL= ∞, unless otherwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF,
CIN2=CCOM= 1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Class D Switching Frequency fSPK 948 1158 kHz
Spread-Spectrum Bandwidth ±15 kHz
Efficiency POUT = 1.5W, fIN = 1kHz, RL = 8 (Note 5) 83 %
HEADPHONE AMPLIFIER
RL = 16 100
Output Power POUT
THD+N = 1%,
f = 1kHz,
TA = +25°CRL = 32 180
mW
RL = 32, fIN= 6kHz, 20kHz AES17,
VIN= -3dBFS = 212mVRMS -78
RL = 10k, fIN = 6kHz, 20kHz AES17,
VIN= -3dBFS = 500mVRMS -87
dBFS
RL = 32, POUT = 100mW, f = 1kHz 0.006
Total Harmonic Distortion Plus
Noise THD+N
RL = 16, POUT = 75mW, f = 1kHz 0.014 %
VHPVDD = 2.7V to 5.5V, TA = +25°C 70107
f = 1kHz, VRIPPLE = 200mVP-P 91 Power-Supply Rejection Ratio PSRR
f = 10kHz, VRIPPLE = 200mVP-P 80
dB
Feedback Impedance RFHP 38.2 40.2 42.2 k
Gain AV RIN2= 40.2k 0 dB
Output Offset Voltage VOS TA = +25°C ±0.3 ±3 mV
Into shutdown -81
Click-and-Pop Level KCP
RL = 32,
peak voltage,
A-weighted, 32 samples
per second (Notes 6, 7)
Out of
shutdown -72.5
dBV
A-weighted 102 Signal-to-Noise Ratio SNR RL = 32, POUT = 40mW,
fIN = 1kHz 20Hz to 20kHz 94 dB
Noise VN A-weighted 8 µVRMS
Maximum Capacitive Load CL No sustained oscillations 100 pF
RL = 32, VIN =
-20dBFS = 30mVRMS 82 L to R, R to L, fIN
= 1kHz, COM
and SENSE
connected
RL = 10k, VIN =
-20dBFS = 0.7mVRMS 89
RL = 32, VIN =
-20dBFS = 30mVRMS 64 L to R, R to L, fIN
= 15kHz, COM
and SENSE
connected
RL = 10k, VIN =
-20dBFS = 70.7mVRMS 70
Crosstalk
SPKR to HP, RLSPKR = 8, PSPKR = 1W,
RLHP = 32, fIN = 1Hz 80
dB
ELECTRICAL CHARACTERISTICS (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2µF (CLDO= 4µF for 1.8V LDO option),=C2 = 1µF. RL= ∞, unless otherwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF,
CIN2=CCOM= 1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
COM Input Range VCOM Inferred from CMRR test -300 +300 mV
Common-Mode Rejection Ratio CMRR -300mV < VCOM < +300mV 60 dB
Slew Rate SR 0.38 V/µs
Charge-Pump Frequency fOSC 530 kHz
BEEP INPUT (LDO_EN = 1)
Beep Signal Minimum fBEEP Four-cycle count 215 Hz
Amplifier Turn-On Time tONBEEP 0.4 ms
Amplifier Hold Time tHOLDBEEP 221 246 271 ms
LOW-DROPOUT LINEAR REGULATOR
LDO Ground Current ILDO 0.25 0.4 mA
Output Current IOUT Inferred from load regulation 120 mA
Current Limit ILIM 300 mA
Crosstalk
Speaker to LDO, VLDO_OUT = 4.75V,
f =1kHz, ILDO_OUT = 10mA, speaker POUT
= 1.2W, RL = 8 (Note 6)
-80 dB
VLDO_OUT = 4.75V ±1.5 Output-Voltage Accuracy VLDO_OUT = 3.3V ±1.5 %
IOUT = 50mA 46 Dropout Voltage VDOVLDO_OUT = 4.75V,
TA = +25°C (Note 8) IOUT = 120mA 106
mV
Startup Time 30 µs
VAVDD = 5V to 5.5V, VLDO_OUT = 4.75V,
ILDO_OUT = 1mA, CLDO = 2µF -4.8 1.5 +4.8
VAVDD = 4.5V to 5.5V, VLDO_OUT = 3.3V,
ILDO_OUT = 1mA, CLDO = 2µF -4 0.2 +4 Line Regulation
VAVDD = 3V to 5.5V, VLDO_OUT = 1.8V,
ILDO_OUT = 1mA, CLDO = 4µF -6.4 2.5 +6.4
mV/V
Load Regulation VLDO_OUT = 4.75V, 1mA < ILDO_OUT <
120mA 0.22 mV/mA
f = 1kHz 56
Ripple Rejection
VRIPPLE = 200mVP-P,
VLDO_OUT = 4.75V
ILDO_OUT = 10mA f = 10kHz 40
dB
Output-Voltage Noise 20Hz to 20kHz, CLDO_OUT = 2 x 1µF,
ILDO_OUT = 120mA 130 µVRMS
DIGITAL INPUTS (SPKR_EN, HP_EN, LDO_EN, BEEP)
Input-Voltage High VINH 1.4 V
Input-Voltage Low VINL 0.4 V
Input Bias Current -1 +1 µA
ELECTRICAL CHARACTERISTICS (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2µF (CLDO= 4µF for 1.8V LDO option),=C2 = 1µF. RL= ∞, unless otherwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF,
CIN2=CCOM= 1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
Typical Operating Characteristics
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF, CIN2= CCOM= 1µF, measurement BW
= 20kHz AES17, TA= +25°C, unless otherwise noted. Speaker mode: SPKR_EN= 0, HP_EN = 0. Headphone mode: SPKR_EN= 1,
HP_EN = 1.)
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
Note 3:All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Note 4:AVDD and PVDD must be tied together. If LDO is enabled, set AVDD and PVDD as specified in the Line Regulation row of
the Electrical Characteristicstable.
Note 5:Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For RL= 3Ω, L = 22µH.
For RL= 4Ω, L = 33µH. For RL= 8Ω, L = 68µH.
Note 6:Specified at TA= +25°C with an 8Ω+ 68µH load connected across BTL output for speaker amplifier. Specified at TA= +25°C
with a 32Ωresistive load connected between HPR, HPL and GND for headphone amplifier. Speaker and headphone mode
transitions are controlled by SPKR_ENand HP_EN inputs, respectively.
Note 7:Amplifier Inputs AC-coupled to GND.
Note 8:Guaranteed by ATE characterization; limits are not production tested.
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (MAX9792 SPEAKER MODE)
MAX9791 toc01
FREQUENCY (kHz)
THD+N (dBFS)
RL = 3Ω
VIN = -3dBFS
FS = 707mVRMS
FS = 1VRMS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (MAX9791 SPEAKER MODE)
MAX9791 toc02
FREQUENCY (kHz)
THD+N (dBFS)
RL = 4Ω
VIN = -3dBFS
FS = 707mVRMS
FS = 1VRMS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (MAX9791 SPEAKER MODE)
MAX9791 toc03
FREQUENCY (kHz)
THD+N (dBFS)
RL = 8Ω
VIN = -3dBFS
FS = 707mVRMS
FS = 1VRMS
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (MAX9792 SPEAKER MODE)
MAX9791 toc04
THD+N (%)
RL = 3Ω
f = 6kHz
f = 1kHz
f = 100Hz
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (MAX9791 SPEAKER MODE)
MAX9791 toc05
THD+N (%)
RL = 4Ω
f = 6kHz
f = 1kHz
f = 100Hz
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (MAX9791 SPEAKER MODE)
MAX9791 toc06
THD+N (%)
RL = 8Ω
f = 6kHz
f = 1kHz
f = 100Hz
ELECTRICAL CHARACTERISTICS (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2µF (CLDO= 4µF for 1.8V LDO option),=C2 = 1µF. RL= ∞, unless otherwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF,
CIN2=CCOM= 1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
SPEAKER
Typical Operating Characteristics (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF, CIN2= CCOM= 1µF, measurement BW
= 20kHz AES17, TA= +25°C, unless otherwise noted. Speaker mode: SPKR_EN= 0, HP_EN = 0. Headphone mode: SPKR_EN= 1,
HP_EN = 1.)
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9792 SPEAKER MODE)
MAX9791 toc07
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
f = 1kHz
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9792 SPEAKER MODE)
MAX9791 toc07a
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
VPVDD = VAVDD = 3.7V
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9791 SPEAKER MODE)
MAX9791 toc08
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
f = 1kHz
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. LOAD RESISTANCE
(MAX9791 SPEAKER MODE)
MAX9791 toc08a
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
VPVDD = VAVDD = 3.7V
THD+N = 10%
THD+N = 1%
EFFICIENCY vs. OUTPUT POWER
(MAX9792 SPEAKER MODE)
MAX9791 toc09
OUTPUT POWER (W)
EFFICIENCY (%)
RL = 8Ω
RL = 3Ω
fIN = 1kHz
EFFICIENCY vs. OUTPUT POWER
(MAX9792 SPEAKER MODE)
MAX9791 toc09a
EFFICIENCY (%)
VPVDD = VAVDD = 3.7V
fIN = 1kHz
RL = 8Ω
RL = 3Ω
EFFICIENCY vs. OUTPUT POWER
(MAX9791 SPEAKER MODE)
MAX9791 toc10
EFFICIENCY (%)
RL = 8Ω
RL = 4Ω
fIN = 1kHz
EFFICIENCY vs. OUTPUT POWER
(MAX9791 SPEAKER MODE)
MAX9791 toc10a
EFFICIENCY (%)
VPVDD = VAVDD = 3.7V
fIN = 1kHz
RL = 8Ω
RL = 4Ω
SPEAKER
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
OUTPUT POWER vs. SUPPLY VOLTAGE
(MAX9791 SPEAKER MODE)
MAX9791 toc10b
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
f = 1kHz
RLOAD = 4Ω
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. SUPPLY VOLTAGE
(MAX9791 SPEAKER MODE)
MAX9791 toc10c
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
f = 1kHz
RLOAD = 8Ω
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. SUPPLY VOLTAGE
(MAX9792 SPEAKER MODE)
MAX9791 toc10d
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
f = 1kHz
RLOAD = 8Ω
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. SUPPLY VOLTAGE
(MAX9792 SPEAKER MODE)
MAX9791 toc10e
SUPPLY VOLTAGE
OUTPUT POWER (W)
f = 1kHz
RLOAD = 3Ω
THD+N = 10%
THD+N = 1%
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (SPEAKER MODE)
MAX9791 toc11
FREQUENCY (kHz)
PSRR (dB)
LEFT
RIGHT
VRIPPLE = 200mVP-P
RL = 8Ω
CROSSTALK vs. FREQUENCY
(SPEAKER MODE)
MAX9791 toc12
FREQUENCY (kHz)
CROSSTALK (dB)
RIGHT TO LEFT
LEFT TO RIGHT
FS = 1VRMS
VIN = -20dBFS
RL = 8Ω
Typical Operating Characteristics (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF, CIN2= CCOM= 1µF, measurement BW
= 20kHz AES17, TA= +25°C, unless otherwise noted. Speaker mode: SPKR_EN= 0, HP_EN = 0. Headphone mode: SPKR_EN= 1,
HP_EN = 1.)SPEAKER
Typical Operating Characteristics (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF, CIN2= CCOM= 1µF, measurement BW
= 20kHz AES17, TA= +25°C, unless otherwise noted. Speaker mode: SPKR_EN= 0, HP_EN = 0. Headphone mode: SPKR_EN= 1,
HP_EN = 1.)
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
SPEAKER STARTUP WAVEFORM
MAX9791 toc13
SPKR_EN
2V/div
SPEAKER OUT
200µs/div
SPEAKER SHUTDOWN WAVEFORM
MAX9791 toc14
SPKR_EN
2V/div
SPEAKER OUT
200µs/div
WIDEBAND OUTPUT SPECTRUM
(SPEAKER MODE)
MAX9791 toc15
FREQUENCY (MHz)
OUTPUT AMPLITUDE (dBV)1
RBW = 1kHz
INPUT AC GROUNDED
OUTPUT FREQUENCY SPECTRUM
(SPEAKER MODE)
MAX9791 toc16
FREQUENCY (kHz)
OUTPUT MAGNITUDE (dBV)
VOUT = -60dBV
f = 1kHz
RL = 8Ω
UNWEIGHTED
SPEAKER
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc17
FREQUENCY (kHz)
THD+N (dBFS)
FS = 300mVRMS
FS = 1VRMS
RL = 16Ω
VIN = -3dBFS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc18
FREQUENCY (kHz)
THD+N (dBFS)
FS = 300mVRMS
FS = 1VRMS
VHPVDD = 3V
RL = 16Ω
VIN = -3dBFS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc19
FREQUENCY (kHz)
THD+N (dBFS)
FS = 300mVRMS
FS = 1VRMS
RL = 32Ω
VIN = -3dBFS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc20
FREQUENCY (kHz)
THD+N (dBFS)
FS = 300mVRMS
FS = 1VRMS
VHPVDD = 3V
RL = 32Ω
VIN = -3dBFS
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9791 toc21
OUTPUT POWER (mW)
THD+N (%)
f = 6kHz
f = 1kHz
f = 100Hz
RL = 16Ω
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9791 toc22
OUTPUT POWER (mW)
THD+N (%)0.1
f = 6kHz
f = 1kHz
f = 100Hz
RL = 32Ω
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9791 toc23
THD+N (%)
f = 6kHzf = 1kHz
f = 100Hz70603020
VHPVDD = 3V
RL = 16Ω
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9791 toc24A
THD+N (%)
f = 6kHz
f = 1kHz
f = 100Hz3020
VHPVDD = 3V
RL = 32Ω
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
MAX9791 toc25
OUTPUT POWER (mW)
f = 1kHz
THD+N = 10%
THD+N = 1%
Typical Operating Characteristics (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF, CIN2= CCOM= 1µF, measurement BW
= 20kHz AES17, TA= +25°C, unless otherwise noted. Speaker mode: SPKR_EN= 0, HP_EN = 0. Headphone mode: SPKR_EN= 1,
HP_EN = 1.)HEADPHONE
MAX9791/MAX9792
HEADPHONE OUTPUT POWER
vs. HPVDD
MAX9791 toc29
HPVDD (V)
HEADPHONE OUTPUT POWER (mW)
THD+N = 1%
f = 1kHz
RL = 32Ω
RL = 16Ω
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
MAX9791 toc26
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
VHPVDD = 3V
f = 1kHz
THD+N = 10%
THD+N = 1%
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9791 toc27
PER CHANNEL OUTPUT POWER (mW)
POWER DISSIPATION PER CHANNEL (mW)100150
RL = 32Ω
RL = 16Ω
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9791 toc28
PER CHANNEL OUTPUT POWER (mW)
POWER DISSIPATION PER CHANNEL (mW)
RL = 32Ω
VHPVDD = 3VRL = 16Ω
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc30
FREQUENCY (kHz)
PSRR (dB)
VRIPPLE = 200mVP-P
RL = 32Ω
LEFT
RIGHT
CROSSTALK vs. FREQUENCY
(HEADPHONE MODE)
MAX9791 toc31
FREQUENCY (kHz)
CROSSTALK (dB)
RIGHT TO LEFT
COM AND SENSE
DISABLED
RIGHT TO LEFT
COM AND SENSE
DISABLED
LEFT TO RIGHT
COM AND SENSE
RL = 32Ω
FS = 300mVRMS
VIN = -20dBFS
RIGHT TO LEFT
COM AND SENSE
Typical Operating Characteristics (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF, CIN2= CCOM= 1µF, measurement BW
= 20kHz AES17, TA= +25°C, unless otherwise noted. Speaker mode: SPKR_EN= 0, HP_EN = 0. Headphone mode: SPKR_EN= 1,
HP_EN = 1.)HEADPHONE
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
OUTPUT FREQUENCY SPECTRUM
(HEADPHONE MODE)
MAX9791 toc32
FREQUENCY (kHz)
OUTPUT FREQUENCY SPECTRUM (dB)
RIGHT AND LEFT
FS = 707mVRMS
VIN = -60dBFS
RL = 32Ω
MAX9791 toc33
HP_EN
2V/div
HP_
500mV/div
200μs/div
STARTUP WAVEFORM
MAX9791 toc34
HP_EN
2V/div
HP_
500mV/div
200μs/div
SHUTDOWN WAVEFORM
HEADPHONE RF IMMUNITY
vs. FREQUENCY
MAX9791 toc35
FREQUENCY (MHz)
AMPLITUDE (dBV)
LEFT
RIGHT
RL = 32Ω
HEADPHONE
Typical Operating Characteristics (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF, CIN2= CCOM= 1µF, measurement BW
= 20kHz AES17, TA= +25°C, unless otherwise noted. Speaker mode: SPKR_EN= 0, HP_EN = 0. Headphone mode: SPKR_EN= 1,
HP_EN = 1.)
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc36
FREQUENCY (kHz)
THD+N (dBFS)
RL = 10kΩ
VIN = -3dBFS
FS = 707mVRMSFS = 1VRMS
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9791 toc37
FREQUENCY (kHz)
THD+N (dBFS)
VHPVDD = 3V
RL = 10kΩ
VIN = -3dBFS
FS = 707mVRMSFS = 1VRMS
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9791 toc38
OUTPUT POWER (mW)
THD+N (%)
RL = 10kΩ
f = 6kHz
f = 1kHz
f = 100Hz
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9791 toc39
OUTPUT POWER (mW)
THD+N (%)
VHPVDD = 3V
RL = 10kΩ
f = 6kHz
f = 1kHz
f = 100Hz
CROSSTALK vs. FREQUENCY
(HEADPHONE MODE)
MAX9791 toc40
FREQUENCY (kHz)
CROSSTALK (dB)
LEFT TO RIGHT
COM AND SENSE
RL = 10kΩ
FS = 707mVRMS
VIN = -20dBFS
RIGHT TO LEFT
COM AND SENSE
OUTPUT FREQUENCY SPECTRUM
(HEADPHONE MODE)
MAX9791 toc41
FREQUENCY (kHz)
OUTPUT FREQUENCY SPECTRUM (dB)
RIGHT AND LEFT
RL = 10kΩ
FS = 300mVRMS
VIN = -60dBFS
Typical Operating Characteristics (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF, CIN2= CCOM= 1µF, measurement BW
= 20kHz AES17, TA= +25°C, unless otherwise noted. Speaker mode: SPKR_EN= 0, HP_EN = 0. Headphone mode: SPKR_EN= 1,
HP_EN = 1.)
LINE OUT
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9791 toc42
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
LDO_EN = 1, VLDO = 3.3V OR 4.75V
SPKR_EN = 1
HP_EN = 0
SPKR_EN = 0
HP_EN = 1
SPKR_EN = 0
HP_EN = 0
SPKR_EN = 1
HP_EN = 1
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9791 toc42a
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
LDO_EN = 1
VLDO_OUT = 1.8V
SPKR_EN = 1
SPKR_EN = 1
SPKR_EN = 0
SPKR_EN = 0
SHUTDOWN CURRENT vs. SUPPLY VOLTAGE
MAX9791 toc43
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (
SPKR_EN = 1
HP_EN = 0
LDO_EN = 0
Typical Operating Characteristics (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF, CIN2= CCOM= 1µF, measurement BW
= 20kHz AES17, TA= +25°C, unless otherwise noted. Speaker mode: SPKR_EN= 0, HP_EN = 0. Headphone mode: SPKR_EN= 1,
HP_EN = 1.)
GENERAL
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
LDO OUTPUT ACCURACY
vs. LOAD CURRENT
MAX9791 toc44
LOAD CURRENT (mA)
LDO OUTPUT ACCURACY (%)
LDO OUTPUT ACCURACY
vs. AMPLIFIER OUTPUT POWER
MAX9791 toc45
AMPLIFIER OUTPUT POWER (mW)
LDO OUTPUT ACCURACY (%)
LDO OUTPUT ACCURACY
vs. TEMPERATURE
MAX9791 toc46
TEMPERATURE (°C)
LDO OUTPUT ACCURACY (%)3510-15
VLDO_OUT = 3.3V
VLDO_OUT = 1.8V
VLDO_OUT = 4.75V
LDO DROPOUT VOLTAGE vs. LOAD
MAX9791 toc47
ILOAD (mA)
LDO DROPOUT VOLTAGE (mV)
LDO_OUT = 4.75V
LDO POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9791 toc48
FREQUENCY (kHz)
PSRR (dB)10.1
VRIPPLE = 200mVP-P
ILOAD = 10mA
VLDO_OUT = 3.3V
VLDO_OUT = 1.8V
VLDO_OUT = 4.75V
LDO OUTPUT NOISE
MAX9791 toc49
FREQUENCY (kHz)
LDO OUTPUT NOISE (10.1
CLOAD = 2 x 1μF
ILOAD = 120mA
Typical Operating Characteristics (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF, CIN2= CCOM= 1µF, measurement BW
= 20kHz AES17, TA= +25°C, unless otherwise noted. Speaker mode: SPKR_EN= 0, HP_EN = 0. Headphone mode: SPKR_EN= 1,
HP_EN = 1.)
LDO
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
1.00ms/div
LINE-TRANSIENT RESPONSE
CH1 LOW
4.560V
CH1 HIGH
5.500V
CH2 HIGH
1.000mV
CH2 LOW
800.0μV
MAX9791 toc50
100ms/div
LOAD-TRANSIENT RESPONSE
ILDO_OUT
50mA/div
MAX9791 toc51
AC-COUPLED
VLDO_OUT
10mV/div
200μs/div
SHUTDOWN RESPONSE
LDO_EN
2V/div
MAX9791 toc52
VLDO_EN
2V/div
CROSSTALK vs. FREQUENCY
SPEAKER TO LDO
MAX9791 toc53
FREQUENCY (kHz)
CROSSTALK (dB)10.1
BOTH SPEAKERS WITH SIGNAL
PSPKR = 1.2W
RLSPKR = 8W
ILDO = 10mA
LEFT CHANNEL TO LDO
RIGHT CHANNEL TO LDO
Typical Operating Characteristics (continued)
(VAVDD= VPVDD= VHPVDD= 5V, VGND= VPGND= VCPGND= 0, ILDO_OUT= 0, CLDO= 2 x 1µF, C1 = C2 = 1µF. RL= ∞, unless oth-
erwise specified. RIN1= 20kΩ(AVSPKR= 12dB), RIN2= 40.2kΩ(AVHP= 0dB), CIN1= 470nF, CIN2= CCOM= 1µF, measurement BW
= 20kHz AES17, TA= +25°C, unless otherwise noted. Speaker mode: SPKR_EN= 0, HP_EN = 0. Headphone mode: SPKR_EN= 1,
HP_EN = 1.)LDO
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
MAX9791 Pin Description
PINNAMEFUNCTIONSPKR_INL Left-Channel Speaker Amplifier Input HP_INR Right-Channel Headphone Amplifier Input HP_INL Left-Channel Headphone Amplifier Input COM Common-Mode Voltage Sense Input GND Signal Ground. Star connect to PGND.
6 LDO_OUT LDO Output. Bypass the MAX9791A/MAX9791B with two 1µF ceramic low ESR capacitors to GND.
Bypass the MAX9791C with two 2µs ceramic low ESR capacitors to GND. AVDDPositive Power-Supply and LDO Input. Bypass with a 0.1µF and two 1µF capacitors to GND. LDO_EN LDO Enable. Connect LDO_EN to AVDD to enable the LDO.
9 HPR Right-Channel Headphone Amplifier Output
10 HPL Left-Channel Headphone Amplifier Output
11 SENSE Headphone Ground Sense
12 CPVSSHeadphone Amplifier Negative Power Supply. Connect a 1µF capacitor between CPVSS and PGND.
13 C1N Charge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor between C1P and C1N.
14 CPGND Charge-Pump Ground. Connect directly to PGND plane.
15 C1P Charge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor between C1P and C1N.
16 HPVDD Headphone Amplifier Positive Power Supply. Connect a 10µF capacitor between HPVDD and PGND.
17, 26 PVDDSpeaker Amplifier Power-Supply Input. Bypass with a 0.1µF capacitor to PGND.
18 OUTL- Left-Channel Speaker Amplifier Output, Negative Phase
19 OUTL+ Left-Channel Speaker Amplifier Output, Positive Phase
20, 23 PGND Power Ground. Star connect to GND.
21 BEEP PC Beep Input. Connect to GND if beep detection function is disabled.
22 HP_EN Active-High Headphone Amplifier Enable
24 OUTR+ Right-Channel Speaker Amplifier Output, Positive Phase
25 OUTR- Right-Channel Speaker Amplifier Output, Negative Phase SPKR_EN Active-Low Speaker Amplifier Enable
28 SPKR_INR Right-Channel Speaker Amplifier Input EP Exposed Pad. Connect to GND.

Partno	Mfg	Dc	Qty	Available	Descript
MAX9791AETI+	MAXIM	N/a	1000	avai	Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers