MAX9879ERV+TCEP Fast Delivery |IC PHOENIX CO.,LIMITED

MAX9879ERV+TCEP ,Stereo Class D Audio Subsystem with DirectDrive Headphone AmplifierBlock DiagramTOP VIEWSINGLE SUPPLY(BUMP SIDE DOWN)2.7V TO 5.5V31 2 4 56AVOLUMEPREAMPLIFIERCONTROLC1 ..
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MAX9879ERV+TCEP
Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
EVALUATION KIT AVAILABLE
General Description
The MAX9879 combines a high-efficiency stereo Class D
audio power amplifier with a stereo capacitor-less
DirectDrive®headphone amplifier. Maxim’s filterless class
D amplifiers with active emissions limiting technology pro-
vide Class AB performance with Class D efficiency.
The Class D power amplifier delivers up to 715mW from
a 3.7V supply into an 8Ωload with 88% efficiency to
extend battery life. The filterless modulation scheme
combined with active emission limiting circuitry and
spread-spectrum modulation greatly reduces EMI while
eliminating the need for output filtering used in tradition-
al Class D devices.
The headphone amplifier delivers up to 58mW from
a 3.7V supply into a 16Ωload. Maxim’s DirectDrive
architecture produces a ground-referenced output from
a single supply, eliminating the need for large DC-
blocking capacitors, saving cost, space and compo-
nent height.
The device utilizes a user-defined input architecture,
three preamplifier gain settings, an input mixer, volume
control, comprehensive click-and-pop suppression, and2C control. A bypass mode feature disables the integrat-
ed Class D amplifier and utilizes an internal DPST switch
to allow an external amplifier to drive the speaker that is
connected at the outputs of the MAX9879.
The MAX9879 is available in a thermally efficient,
space-saving 30-bump UCSP™ package.
Applications
FeaturesBetter than 9dB Margin Under EN 55022 Class B
Limits with No Filter ComponentsLow RF Susceptibility Design Rejects TDMA
Noise from GSM RadiosInput Mixer with User Defined Input ModeStereo 715mW Speaker Output (RL= 8Ω,
VDD= 3.7V)Stereo 58mW Headphone Output (16Ω,
VDD= 3.7V)Low 0.04% THD+N at 1kHz (Class D Power
Amplifier)Low 0.018% THD+N at 1kHz (Headphone
Amplifier)88% Efficiency (RL= 8Ω, POUT= 750mW)1.6ΩAnalog Switch for Speaker Amplifier BypassHigh Speaker Amplifier PSRR (72dB at 217Hz)High Headphone Amplifier PSRR (84dB at 217Hz)I2C ControlHardware and Software Shutdown ModeUltra-Low Click and Pop Robust Design with Current and Thermal
ProtectionAvailable in Space-Saving Package
5x6 UCSP (2.5mm x 3mm)
MIXER
PREAMPLIFIER
SINGLE SUPPLY
2.7V TO 5.5V
I2C
INTERFACE
VOLUME
CONTROL
VOLUME
CONTROL
BYPASS
MAX9879
Simplified Block Diagram
OUTL-PVDDLOUTL+C1P34
PGNDR
RXIN-PGNDLRXIN+C1NPGNDR
GNDGNDGNDVSSGND
BIASINB1INA1HPLSCL
TOP VIEW
(BUMP SIDE DOWN)
OUTR-
PVDDR
OUTR+
SDA
VDDINB2INA2HPRSHDNVCCIO
Pin Configuration
Ordering Information
PARTTEMP RANGEPIN - PA C K A G E
MAX9879ERV+-40°C to +85°C30 UCSP (5x6)
+Denotes a lead(Pb)-free/RoHS-compliant package.
Cell PhonesPortable Multimedia Players
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
UCSP is a trademark of Maxim Integrated Products, Inc.
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
ABSOLUTE MAXIMUM RATINGS
VDD, PVDDL, PVDDR to GND..................................-0.3V to +6V
VDD, PVDDL to PVDDR.........................................-0.3V to +0.3V
VDDto PVDDL.......................................................-0.3V to +0.3V
VCCIOto GND...........................................................-0.3V to +4V
PGNDL, PGNDR, to GND......................................-0.3V to +0.3V
PGNDL to PGNDR.................................................-0.3V to +0.3V
VSSto GND...............................................................-6V to +0.3V
C1N to GND................................................(VSS- 0.3V) to +0.3V
C1P to GND...........................................-0.3V to (PVDD_ + 0.3V)
HPL, HPR to VSS(Note 1).............................-0.3V to the lower of
(VDD- VSS + 0.3V) or +9V
HPL, HPR to VDD(Note 2).........................+0.3V to the higher of
(VSS- PVDD_ - 0.3V) or -9V
INA1, INA2, INB1, INB2, BIAS..................................-0.3V to +4V
SDA, SCL, SHDN......................................................-0.3V to +4V
All Other Pins to GND............................-0.3V to (PVDD_ + 0.3V)
Continuous Current In/Out of PVDD_, PGND_, OUT_....±800mA
Continuous Current In/Out of HPR and HPL.....................140mA
Continuous Current In/Out of RXIN+ and RXIN-...............150mA
Continuous Input Current VSS...........................................100mA
Continuous Input Current (All Other Pins)........................±20mA
Duration of OUT_ Short Circuit
to PGND_ or PVDD_...............................................Continuous
Duration of Short Circuit
Between OUT_+ and OUT_-..................................Continuous
Duration of HP_ Short Circuit to GND or PVDDL........Continuous
Continuous Power Dissipation (TA= +70°C)
5x6 UCSP Multilayer Board
(derate 16.5mW/°C above +70°C).............................1250mW
Junction Temperature......................................................+150°C
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Analog Supply Voltage Range
VDD,
PVDDR
PVDDL
Guaranteed by PSRR Test2.75.5V
Digital Supply Voltage RangeVCCIO1.73.6V
HP mode, RHP = ∞5.69.0
Stereo SPK mode, RSPK = ∞9.818
Mono SPK mode, RSPK = ∞6.610Quiescent CurrentIDD
Stereo SPK + HP mode, RHP= RSPK = ∞13.224
Software shutdown510
Shutdown CurrentISHDN
ISHDN = IDD + IPVDDR
+ IPVDDL + ICC;
TA = +25°CHardware shutdown0.11µA
Turn-On TimetONTime from shutdown or power-on to full
operation10ms
TA = +25°C, preamp = 0dB or +5.5dB112131Input ResistanceRINTA = +25°C, preamp = +20dB35.58kΩ
Preamp = 0dB2.3
Preamp = +5.5dB1.2Headphone amplifier
path
Preamp = +20dB0.23
Preamp = 0dB1.2
Preamp = +5.5dB0.64
Maximum Input Signal Swing
Speaker amplifier path
VP-P
ELECTRICAL CHARACTERISTICS
(VDD= VPVDDL= VPVDDR= 3.7V, VCCIO= 1.8V, VGND= VPGNDL= VPGNDR= 0. Single-ended inputs, preamp = 0, volume controls =
0dB, BYPASS = 0, SHDN= 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL or HPR to
GND. RSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
(Notes 3, 4)
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.
Note 1:HPR and HPL should be limited to no more than 9V above VSS, or above PVDD+ 0.3V, whichever limits first.
Note 2:HPR and HPL should be limited to no more than 9V below PVDD, or below VSS- 0.3V, whichever limits first.
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Preamp = 058
Preamp = 5.5dB55Common-Mode Rejection RatioCMRRfIN = 1kHz (differential
input mode)
Preamp = 20dB43
Input DC VoltageIN__ inputs1.221.31.38V
Bias VoltageVBIAS1.131.21.272V
SPEAKER AMPLIFIER
TA = +25°C (volume at mute)±0.5±4mV
Output Offset VoltageVOSTA = + 25° C ( vol um e at 0d B, E N A = 1 and N B = 0 or E N B = 1 and E N A = 0, ΔIN _ = 0) ±4.5mV
Into shutdown-70
Click-and-Pop LevelKCP
Peak voltage,
TA = +25°C
A-weighted, 32 samples
per second, volume at
mute (Note 5)
Out of shutdown-70
dBV
PVDD_ = VDD
= 2.7V to 5.5V5076
f = 217Hz,
100mVP-P ripple72
f = 1kHz,
100mVP-P ripple68
Power-Supply Rejection Ratio
(Note 5)PSRRTA = +25°C
f = 20kHz,
100mVP-P ripple55
VDD = 3.7V715
VDD = 3.3V565Output PowerPOUTTHD+N ≤ 1%, RSPK =
VDD = 3.0V470
Total Harmonic Distortion + NoiseTHD+Nf = 1kHz, POUT = 350mW, TA = +25°C,
RSPK = 8Ω0.040.2%
ΔIN_ = 0
(single-ended)92A-weighted, ENA = 1
and ENB = 0 or ENB = 1
and ENA = 0ΔIN_ = 1
(differential)94
ΔIN_ = 0
(single-ended)88
Signal-to-Noise RatioSNR
A-weighted ENA =
ENB = 1ΔIN_ = 1
(differential)92
Output Frequency700
±40kHz
ELECTRICAL CHARACTERISTICS (continued)
(VDD= VPVDDL= VPVDDR= 3.7V, VCCIO= 1.8V, VGND= VPGNDL= VPGNDR= 0. Single-ended inputs, preamp = 0, volume controls =
0dB, BYPASS = 0, SHDN= 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL or HPR to
GND. RSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
(Notes 3, 4)
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VDD= VPVDDL= VPVDDR= 3.7V, VCCIO= 1.8V, VGND= VPGNDL= VPGNDR= 0. Single-ended inputs, preamp = 0, volume controls =
0dB, BYPASS = 0, SHDN= 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL or HPR to
GND. RSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
(Notes 3, 4)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Current Limit1.5A
EfficiencyηPOUT = 600mW, f = 1kHz88%
Speaker GainAV17.41818.4dB
Output NoiseA-weighted, (ENA = 1 and ENB = 0
or ENA = 0 and ENB = 1), ΔIN_ = 063µVRMS
CrosstalkOUTL to OUTR, OUTR to OUTL,
f = 20Hz to 20kHz75dB
HEADPHONE AMPLIFIERS
TA = +25°C (volume at mute)±0.22±0.85mV
Output Offset VoltageVOSTA = + 25° C ( V ol um e at 0d B, E N A = 1 and N B = 0 or E N A = 0 and E N B = 1, ΔIN _ = 0) ±1.5mV
Into shutdown-75
Click-and-Pop LevelKCP
Peak voltage, TA = 25°C
A-weighted, 32 samples
per second, volume at
mute (Note 5)
Out of shutdown-75
dBV
PVDD_ = VDD
= 2.7V to 5.5V7085
f = 217Hz,
VRIPPLE
= 100mVP-P
f = 1kHz,
VRIPPLE
= 100mVP-P
Power-Supply Rejection Ratio
(Note 5)PSRRTA = +25°C
f = 20kHz,
VRIPPLE
= 100mVP-P
RHP = 16Ω58Output PowerPOUTTHD+N = 1%RHP = 32Ω54mW
Headphone GainAV2.633.4dB
Channel-to-Channel Gain
Tracking
TA = +25°C, HPL to HPR, volume at 0dB,
ENA=1 and ENB = 0 or ENA = 1 and ENB
= 0, ΔIN_ = 0
±0.3±2.5%
RHP = 32Ω
(POUT = 10mW, f = 1kHz)0.018
Total Harmonic Distortion + NoiseTHD+N
RHP = 16Ω
(POUT = 10mW, f = 1kHz)0.0370.08
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VDD= VPVDDL= VPVDDR= 3.7V, VCCIO= 1.8V, VGND= VPGNDL= VPGNDR= 0. Single-ended inputs, preamp = 0, volume controls =
0dB, BYPASS = 0, SHDN= 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL or HPR to
GND. RSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
(Notes 3, 4)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
ΔIN_ = 098ENA = 1 and
ENB = 0 or
ENA = 1 and
ENB = 0ΔIN_ = 198
ΔIN_ = 096
Signal-to-Noise RatioSNRA-weighted,
RHP = 16Ω
ENA = 1 and
ENB = 1ΔIN_ = 196
Slew RateSR0.35V/µs
Capacitive DriveCL100pF
CrosstalkHPL to HPR, HPR to HPL, f = 20Hz to 20kHz67dB
Charge-Pump Frequency350
±20kHz
VOLUME CONTROL
Minimum Setting_VOL = 1-75dB
Maximum Setting_VOL = 310dB
PGAIN_ = 000
PGAIN_ = 015.5Input GainInput A or B
PGAIN_ = 1020
Speaker100Mute Attenuationf = 1kHz, _VOL = 0Headphone110dB
Zero-Crossing Detection Time
OutZCD = 160ms
ANALOG SWITCH
TA = +25°C2.44
On-ResistanceRON
IRXIN__ = 20mA,
RXIN_ = 0 and VDD,
BYPASS = 1TA = TMIN to TMAX5.2
Series resistance is
10Ω per switch0.30.25%Total Harmonic Distortion + Noise
VDIFRXIN = 2VP-P,
VCMRXIN = VDD/2,
f = 1kHz, BYPASS = 1No series resistors0.3
Off-Isolation
BYPASS = 0, RXIN+ and RXIN- to GND =
50Ω, RSPK = 8Ω, f = 10kHz, referred to
speaker output signaldB
DIGITAL INPUTS (SDA, SCL, SHDN)
Input Voltage High (SDA, SCL)VIH0.7 x
VCCIOV
Input Voltage Low (SDA, SCL)VIL0.3 x
VCCIOV
Input Hysteresis (SDA, SCL)VHYS200mV
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VDD= VPVDDL= VPVDDR= 3.7V, VCCIO= 1.8V, VGND= VPGNDL= VPGNDR= 0. Single-ended inputs, preamp = 0, volume controls =
0dB, BYPASS = 0, SHDN= 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL or HPR to
GND. RSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
(Notes 3, 4)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Input Voltage High (SHDN)VIH1.4V
Input Voltage Low (SHDN)VIL0.4V
Input Hysteresis (SHDN)VHYS100mV
SDA, SCL, SHDN Input
CapacitanceCIN10pF
Input Leakage CurrentIINSDA, SCL, SHDN, TA = +25°C±1.0µA
Input Leakage CurrentIINVCCIO = 0, TA = +25°C±1.0µA
DIGITAL OUTPUTS (SDA open drain)
Output Low-Voltage SDAVOLISINK = 3mA0.4V
Output High-Voltage SDAVOHISINK = 3mAVCCIO -
0.4V
Output Fall Time SDAtOFVH(MIN) to VL(MAX) bus capacitance
= 10pF to 400pF, ISINK = 3mA250ns
2-WIRE INTERFACE TIMING
External Pullup Voltage Range
(SDA and SCL)1.73.6V
Serial-Clock FrequencyfSCLDC400kHz
Bus Free Time Between STOP
and START ConditionstBUF1.3µs
START Condition HoldtHD:STA0.6µs
START Condition Setup TimetSU:STA0.6µs
Clock Low PeriodtLOW1.3µs
Clock High PeriodtHIGH0.6µs
Data Setup TimetSU:DAT100ns
Data Hold TimetHD:DAT0900ns
SCL/SDA Receiving Rise TimetR(Note 6)20 +
0.1 x CB300ns
SCL/SDA Receiving Fall TimetF20 +
0.1 x CB300ns
VCCIO =1.8V (Note 6)20 +
0.1 x CB250
SDA Transmitting Fall TimetF
VCCIO = 3.6V (Note 6)20 +
0.05 x CB250
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
Note 3:All devices are 100% production tested at TA= +25°C. All temperature limits are guaranteed by design.
Note 4:Class D amplifier testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For
RSPKR= 8Ω, L = 68mH.
Note 5:Amplifier inputs are AC-coupled to GND.
Note 6:CBis in pF.
ELECTRICAL CHARACTERISTICS (continued)
(VDD= VPVDDL= VPVDDR= 3.7V, VCCIO= 1.8V, VGND= VPGNDL= VPGNDR= 0. Single-ended inputs, preamp = 0dB, volume controls =
0dB, BYPASS = 0, SHDN= 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL or HPR to
GND. RSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
(Notes 3, 4)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Set-Up Time for STOP ConditiontSU:STO0.6µs
Pulse Width of Spike SuppressedtSP050ns
Capacitive Load for Each Bus
LineCB400pF
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
Typical Operating Characteristics
(VDD= VPVDDL= VPVDDR= 3.7V, VCCIO= 1.8V, VGND= VPGNDL= VPGNDR= 0. Single-ended inputs, preamp = 0dB, volume con-
trols = 0dB, BYPASS = 0, SHDN= 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL
or HPR to GND. RSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
GENERAL
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9879 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
HEADPHONE MODE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9879 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
STEREO-SPEAKER MODE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9879 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
HEADPHONE + STEREO-SPEAKER MODE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9879 toc04
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
SOFTWARE-SHUTDOWN MODE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9879 toc05
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (nA)
HARDWARE-SHUTDOWN MODE
VOLUME LEVEL vs. VOLUME STEP
MAX9879 toc06
VOLUME STEP
ATTENUATION (dB)2812164824
fIN = 1kHz
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
Typical Operating Characteristics (continued)
(VDD= VPVDDL= VPVDDR= 3.7V, VCCIO= 1.8V, VGND= VPGNDL= VPGNDR= 0. Single-ended inputs, preamp = 0dB, volume con-
trols = 0dB, BYPASS = 0, SHDN= 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL
or HPR to GND. RSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
SPEAKER AMPLIFIERS (Headphone Disabled)
THD+N vs. FREQUENCY SPEAKER
MAX9879 toc07
FREQUENCY (kHz)
THD+N (%)0.110
PVDD_= 3.7V
RL = 8Ω
OUTPUT POWER = 200mW
OUTPUT POWER = 600mW
THD+N vs. FREQUENCY SPEAKER
MAX9879 toc08
FREQUENCY (kHz)
THD+N (%)0.110
PVDD_= 3.0V
RL = 8Ω
OUTPUT POWER = 100mW
OUTPUT POWER = 400mW
THD+N vs. OUTPUT POWER
MAX9879 toc09
OUTPUT POWER (mW)
THD+N (%)
PVDD_ = 3.7V
RL = 8Ω
fIN = 6kHz
fIN = 1kHzfIN = 20Hz
THD+N vs. OUTPUT POWER
MAX9879 toc10
OUTPUT POWER (mW)
THD+N (%)
PVDD_ = 3.0V
RL = 8Ω
fIN = 6kHz
fIN = 1kHzfIN = 20Hz
EFFICIENCY vs. OUTPUT POWER
MAX9879 toc12
OUTPUT POWER (mW)
EFFICIENCY (%)
fIN = 1kHz, RL = 8Ω
THD+N vs. OUTPUT POWER
MAX9879 toc11
OUTPUT POWER (mW)
THD+N (%)
PVDD_ = 3.7V
RL = 8Ω
LEFT SPEAKER ONLY
fIN = 6kHz
fIN = 1kHzfIN = 20Hz
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9879 toc13
SUPPLY VOTAGE (V)
OUPUT POWER (mW)
RL = 8Ω
fIN = 1kHzTHD+N = 10%
THD+N = 1%
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
OUTPUT FREQUENCY SPECTRUM
SPEAKER MODE
MAX9879 toc17
FREQUENCY (kHz)
OUTPUT MAGNITUDE (dBV)
VOUT = -60dBV
f = 1kHz
RL = 8Ω
UNWEIGHTED
Typical Operating Characteristics (continued)
(VDD= VPVDDL= VPVDDR= 3.7V, VCCIO= 1.8V, VGND= VPGNDL= VPGNDR= 0. Single-ended inputs, preamp = 0dB, volume con-
trols = 0dB, BYPASS = 0, SHDN= 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL
or HPR to GND. RSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
OUTPUT POWER vs. LOAD
MAX9879 toc14
LOAD (Ω)
OUPUT POWER (mW)
f = 1kHz
THD+N = 10%
THD+N = 1%
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (SPEAKER MODE)
MAX9879 toc15
FREQUENCY (kHz)
PSRR (dB)
RL = 8Ω
VRIPPLE = 100mVP-P
INPUTS AC GROUNDED
RIGHT
LEFT
CROSSTALK vs. FREQUENCY
MAX9879 toc16
FREQUENCY (kHz)
CROSSTALK (dB)10.1
RIGHT TO LEFT
LEFT TO RIGHT
RL = 8Ω
VIN = 1VP-P
WIDEBAND FREQUENCY SPECTRUM
(SPEAKER MODE)
MAX9879 toc18
FREQUENCY (MHz)
OUTPUT MAGNITUDE (dBV)
RBW = 1kHz
INPUT AC GROUNDED
MAX9879 toc19
400µs/div
OUT+ - OUT-
1V/div
SHDN
1V/div
SPEAKER AMPLIFIERS (Headphone Disabled)
MAX9879 toc20
2ms/div
SCL
2V/div
SDA
2V/div
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
Typical Operating Characteristics (continued)
(VDD= VPVDDL= VPVDDR= 3.7V, VCCIO= 1.8V, VGND= VPGNDL= VPGNDR= 0. Single-ended inputs, preamp = 0dB, volume con-
trols = 0dB, BYPASS = 0, SHDN= 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL
or HPR to GND. RSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
MAX9879 toc21
2ms/div
SCL
2V/div
OUT+ - OUT-
1V/div
SDA
2V/div
HEADPHONE AMPLIFIERS (Speaker Disabled)
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9879 toc27
THD+N (%)8040
VDD = 3.7V
RL = 16Ω
fIN = 100Hz
fIN = 1kHzfIN = 6kHz
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9879 toc28
THD+N (%)3050
VDD = 3.0V
RL = 32Ω
fIN = 1kHzfIN = 6kHz
fIN = 100Hz
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9879 toc29
THD+N (%)3050
VDD = 3.0V
RL = 16Ω
fIN = 1kHzfIN = 6kHz
fIN = 100Hz
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9879 toc24
FREQUENCY (kHz)
THD+N (%)0.110
VDD = 3.0V
RL = 32Ω
OUTPUT POWER = 30mW
OUTPUT POWER = 10mW
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9879 toc25
FREQUENCY (kHz)
THD+N (%)0.110
VDD = 3.0V
RL = 16Ω
OUTPUT POWER = 7mW
OUTPUT POWER = 22mW
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9879 toc26
FREQUENCY (kHz)
THD+N (%)0.110
VDD = 3.7V
RL = 32Ω
fIN = 1kHz
fIN = 6kHz
fIN = 100Hz
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE MODE)
MAX9879 toc22
FREQUENCY (kHz)
THD+N (%)10.1
VDD = 3.7V
RL = 32Ω
OUTPUT POWER = 20mW
OUTPUT POWER = 45mW
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY (HEADPHONE NOISE)
MAX9879 toc23
FREQUENCY (kHz)
THD+N (%)0.110
VDD = 3.7V
RL = 16Ω
OUTPUT POWER = 10mW
OUTPUT POWER = 40mW
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
Typical Operating Characteristics (continued)
(VDD= VPVDDL= VPVDDR= 3.7V, VCCIO= 1.8V, VGND= VPGNDL= VPGNDR= 0. Single-ended inputs, preamp = 0dB, volume con-
trols = 0dB, BYPASS = 0, SHDN= 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL
or HPR to GND. RSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
HEADPHONE AMPLIFIERS (Speaker Disabled)
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
MAX9879 toc30
OUTPUT POWER (mW)
THD+N (%)
VDD = 3.7V
RL = 32Ω
RL = 16Ω
POWER DISSIPATION vs. OUTPUT POWER
(HEADPHONE MODE)
MAX9879 toc31
TOTAL OUTPUT POWER (mW)
POWER DISSIPATION (mW)
VDD = 3.0V
RL = 16Ω
RL = 32Ω
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9879 toc32
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
THD+N = 10%
THD+N = 10%
RL = 32Ω
fIN = 1kHz
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9879 toc33
SUPPLY VOTAGE (V)
OUPUT POWER (mW)
THD+N = 10%
THD+N = 1%
RL = 16Ω
fIN = 1kHz
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
MAX9879 toc34
LOAD RESISTANCE (Ω)
OUPUT POWER (mW)
THD+N = 10%
THD+N = 1%
VDD = 3.3V
f = 1kHz
OUTPUT POWER vs. LOAD RESISTANCE
(HEADPHONE MODE)
MAX9879 toc35
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
C1 = C2 = 0.47µF
f = 1kHz
THD+N = 1%
C1 = C2 = 1µF
C1 = C2 = 2.2µF
POWER SUPPLY REJECTION RATIO
vs. FREQUENCY (HEADPHONE MODE)
MAX9879 toc36
PSRR (dB)
RIGHT
LEFT
VRIPPLE = 100mVP-P
INPUTS AC GROUNDED
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY (HEADPHONE MODE)
MAX9879 toc37
OUTPUT FREQUENCY SPECTRUM (dB)
VOUT = -60dB
f =1kHz
RL = 32Ω
CROSSTALK vs. FREQUENCY
(HEADPHONE MODE)
MAX9879 toc38
CROSSTALK (dB)
RL = 16Ω
f = 1kHz
VIN = 1VP-P
LEFT TO RIGHT
RIGHT TO LEFT
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
Typical Operating Characteristics (continued)
(VDD= VPVDDL= VPVDDR= 3.7V, VCCIO= 1.8V, VGND= VPGNDL= VPGNDR= 0. Single-ended inputs, preamp = 0dB, volume con-
trols = 0dB, BYPASS = 0, SHDN= 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL
or HPR to GND. RSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
COMMON-MODE REJECTION RATIO
vs. FREQUENCY (HEADPHONE MODE)
MAX9879 toc39
FREQUENCY (kHz)
GAIN (dB)10.1
AV = +5.5dB
AV = +20dB
AV = 0dB
MAX9879 toc40
20µs/div
SHDN
1V/div
HP_
1V/div
HEADPHONE AMPLIFIERS (Speaker Disabled)
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
Typical Operating Characteristics (continued)
(VDD= VPVDDL= VPVDDR= 3.7V, VCCIO= 1.8V, VGND= VPGNDL= VPGNDR= 0. Single-ended inputs, preamp = 0dB, volume con-
trols = 0dB, BYPASS = 0, SHDN= 1. Speaker loads connected between OUT_+ and OUT_-. Headphone loads connected from HPL
or HPR to GND. RSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
MAX9879 toc41
2ms/div
SDA
2V/div
SCL
2V/div
HP_
1V/div
THD+N vs. OUTPUT POWER
BYPASS SWITCH
MAX9879 toc43
OUTPUT POWER (mW)
THD+N (%)
fIN = 100Hz
PVDD_ = 3.7V
RL = 8Ω
NO SERIES RESISTORS
fIN = 1kHz
fIN = 6kHz
THD+N vs. OUTPUT POWER
BYPASS SWITCH
MAX9879 toc44
OUTPUT POWER (mW)
THD+N (%)
fIN = 100HzfIN = 1kHz
fIN = 6kHz
PVDD_ = 3.7V
RL = 8Ω
NO SERIES RESISTORS
MAX9879 toc42
2ms/div
SDA
2V/div
SCL
2V/div
HP_
1V/div
ANALOG SWITCH
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
Pin Description
BUMPNAMEFUNCTIONC1PCharge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor between C1P and C1N.OUTL-Left-Speaker Negative OutputPVDDLLeft-Channel Class D Power Supply. Bypass with a 1µF capacitor to PGNDL.OUTL+Left-Speaker Positive Output
A5, B5PGNDRRight-Channel Class D Power GroundOUTR-Right-Speaker Negative OutputC1NCharge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor between C1P and C1N.RXIN-Receiver Bypass Negative InputPGNDLLeft-Channel Class D Power GroundRXIN+Receiver Bypass Positive InputPVDDRRight-Channel Class D Power Supply. Bypass with a 1µF capacitor to PGNDL.VSSHeadphone Amplifier Negative Power Supply. Bypass with a 1µF capacitor to PGND.
C2, C3, C4,GNDAnalog GroundOUTR+Right-Speaker Positive OutputHPLHeadphone Amplifier Right OutputBIASCommon-Mode Bias. Bypass to GND with a 1µF capacitor.INB1Input B1. Left input or negative input.INA1Input A1. Left input or negative input.SCLSerial-Clock Input. Connect a pullup resistor from SDA to VCCIO.SDASerial-Data Input/Output. Connect a pullup resistor from SDA to VCCIO.HPRHeadphone Amplifier Left OutputVDDAnalog Supply. Connect to PVDDL and PVDDR. Bypass with a 1µF capacitor to GND.INB2Input B2. Right input or positive input.INA2Input A2. Right input or positive input.SHDNActive-Low Shutdown Input SignalVCCIOI2C Power Supply
Detailed Description
Signal Path
The MAX9879 signal path consists of flexible inputs,
signal mixing, volume control, and output amplifiers
(Figures 1a, 1b, 1c).
The inputs can be configured for single-ended or differ-
ential signals (Figure 2). The internal preamplifiers fea-
ture three programmable gain settings of 0dB, +5.5dB,
and +20dB. Following preamplification, the input sig-
nals are mixed, volume adjusted, and routed to the
headphone and speaker amplifiers based on the out-
put mode configuration (see Table 6). The volume con-
trol stages provide up to 75dB attenuation. The
headphone amplifiers provide +3dB of gain while the
speaker amplifier provides +18dB of additional gain.
When an input is configured as mono differential, it can
be routed to both speakers or to both headphones.
When an input is stereo, it is routed to either the stereo
headphones or the stereo speakers. Simultaneous oper-
ation is also possible. If the right speaker amplifier is dis-
abled then the left and right audio signals are summed
into the left speaker amplifier and vice-versa.
When the application does not require the use of both
INA_ and INB_, the SNR of the MAX9879 is improved
by deselecting the unused input through the I2C output
mode register and AC-coupling the unused inputs to
ground with a 330pF capacitor. The 330pF capacitor
and the input resistance to the MAX9879 form a high-
pass filter preventing audible noise from coupling into
the outputs.
MAX9879
Stereo Class D Audio Subsystem
with DirectDrive Headphone Amplifier
CLASS AB
CLASS AB+
INA1
INA2
INB1
INB2
OUTR+
OUTR-
HPL
HPR
OUTL+
OUTL-
INPUT B
INPUT A
CLASS D
CLASS D
STEREO MODE
NOTE: STEREO SPEAKER OUTPUTS MAY
BE SUMMED FOR MONO OUTPUT.
1μF
1μF
1μF
1μF
Figure 1a. Stereo-Mode Signal Path
CLASS AB
CLASS AB
INA1
INA2
INB1
INB2
OUTR+
OUTR-
HPL
HPR
OUTL+
OUTL-
INPUT B
INPUT A
CLASS D
CLASS D
MONO MODE
1μF
1μF
1μF
1μF
Figure 1b. Mono-Mode Signal Path

Partno	Mfg	Dc	Qty	Available	Descript
MAX9879ERV+TCEP \|MAX9879ERVTCEP	MAXIM	N/a	5000	avai	Stereo Class D Audio Subsystem with DirectDrive Headphone Amplifier