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MAX9877AERP+TMAXIMN/a12440avaiLow RF Susceptibility, Mono Audio Subsystem with DirectDrive Headphone Amplifier


MAX9877AERP+T ,Low RF Susceptibility, Mono Audio Subsystem with DirectDrive Headphone AmplifierBlock Diagram Pin ConfigurationSINGLE SUPPLYTOP VIEW2.7V TO 5.25V(BUMP SIDE DOWN)1 2 3 4 5VOLUMEPRE ..
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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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MAX9877AERP+T
Low RF Susceptibility, Mono Audio Subsystem with DirectDrive Headphone Amplifier
General Description
The MAX9877A combines a high-efficiency Class D
audio power amplifier with a stereo Class AB capacitor-
less DirectDrive®headphone amplifier. Maxim’s 3rd
generation, filterless Class D amplifier with active emis-
sions limiting technology provides Class AB perfor-
mance with Class D efficiency.
The MAX9877A delivers up to 725mW from a 3.7V supply
into an 8Ωload with 87% efficiency to extend battery life.
The filterless modulation scheme combined with active
emissions limiting circuitry and spread-spectrum modula-
tion greatly reduces EMI while eliminating the need for
output filtering used in traditional Class D devices.
The stereo Class AB headphone amplifier in the
MAX9877A uses Maxim’s DirectDrive architecture, that
produces a ground-referenced output from a single
supply, eliminating the need for large DC-blocking
capacitors, saving cost, space, and component 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 MAX9877A.
The MAX9877A is available in a thermally efficient,
space-saving 20-bump MaxFilm package.
Applications
Cell PhonesPortable Multimedia Players
FeaturesLow Emissions, Filterless Class D Amplifier
Achieves Better than 10dB Margin Under EN55022
Class B LimitsLow RF Susceptibility Design Rejects TDMA
Noise from GSM RadiosInput Mixer with User-Defined Input Mode725mW Speaker Output (RSPK= 8Ω, PVDD= 3.7V)53mW Headphone Output (RHP= 16Ω, VDD= 3.7V)Low 0.05% THD+N at 1kHz (Class D Power
Amplifier)Low 0.016% THD+N at 1kHz (Headphone
Amplifier)87% Efficiency (RSPK= 8Ω, POUT= 750mW)1.6ΩΩAnalog Switch for Speaker Amplifier BypassHigh Speaker Amplifier PSRR (72dB at 217Hz)High Headphone Amplifier PSRR (84dB at 217Hz)I2C ControlHardware and Software Shutdown ModeClick-and-Pop SuppressionCurrent-Limit and Thermal ProtectionAvailable in a Space-Saving, 2.5mm x 2.0mm
MaxFilm Package
MAX9877AERP
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
MIXER/MUX
PREAMPLIFIER
SINGLE SUPPLY
2.7V TO 5.25V
I2C
INTERFACE
VOLUME
CONTROL
VOLUME
CONTROL
BYPASS
MAX9877A
Simplified Block Diagram
MaxFilm
HPLVSSC1NHPR34
C1P
BIASSDARXIN+VDDOUT+
INB1SCLPGNDINB2PVDD
INA1GNDRXIN-INA2OUT-
TOP VIEW
(BUMP SIDE DOWN)
Pin Configuration
19-4651; Rev 0; 5/09
EVALUATION KIT
AVAILABLE
Ordering Information
PARTTEMP RANGEPIN - PA C K A G E
MAX9877AERP+T-40°C to +85°C20 MaxFilm (5x4)
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
MAX9877AERP
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS = 0,
SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND.
SDA and SCL pullup voltage = 3.3V. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 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.
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.
VDD, PVDDto PGND..............................................-0.3V to +5.5V
VDDto PVDD..........................................................-0.3V to +0.3V
VSSto PGND.........................................................-5.5V to +0.3V
C1N to PGND..............................................(VSS- 0.3V) to +0.3V
C1P to PGND...........................................-0.3V to (PVDD+ 0.3V)
HPL, HPR to VSS
(Note 1)......-0.3V to the lower of (PVDD- (VSS+ 0.3V)) or +9V
HPL, HPR to PVDD
(Note 2)......+0.3V to the higher of (VSS- (PVDD- 0.3V)) or -9V
GND to PGND.....................................................................±0.3V
INA1, INA2, INB1, INB2, BIAS..................................-0.3V to +4V
SDA, SCL...............................................................-0.3V to +5.5V
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 GND or PVDD........Continuous
Duration of Short Circuit Between OUT+ and OUT-..Continuous
Duration of HP_ Short Circuit to GND or PVDD..........Continuous
Continuous Power Dissipation (TA= +70°C)
20-Bump MaxFilm, 5 x 4, Multilayer Board
(derate 13.0mW/°C above +70°C)..................................1.04W
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
Supply Voltage RangeVDD, PVDDGuaranteed by PSRR test2.75.25V
OSC = 005.69.0HP mode,
OUTMODE = 2OSC = 105.5
OSC = 006.611.0SPK mode,
OUTMODE = 7OSC = 105.7
OSC = 0010.416.0
Quiescent CurrentIDD
SPK + HP mode,
OUTMODE = 9OSC = 109.3
Shutdown CurrentISHDNISHDN = IVDD + IPVDD; SHDN = 0; VSDA =
VSCL = logic-high1022µA
OSC = 0010
OSC = 0110Turn-On TimetONTime from shutdown to
full operationOSC = 1017.5
BIAS Release TimetBRAfter forcing BIAS low, time from BIAS
released to I2C reset2580ms
TA = +25°C, preamp gain = 0dB or +9dB112131Input ResistanceRIN
TA = +25°C, preamp gain = +20dB35.58
Preamp = 0dB2.30
Preamp = +9dB0.820Maximum Input Signal Swing
Preamp = +20dB0.230
VP-P
MAX9877AERP
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Preamp = 0dB47
Preamp = +9dB49Common-Mode Rejection RatioCMRRfIN = 1kHz (differential
input mode)
Preamp = +20dB42
Input DC VoltageIN_ inputs1.221.31.38V
Bias VoltageVBIAS1.131.21.27V
SPEAKER AMPLIFIER (OUTMODE = 1)
TA = +25°C (volume at mute)±0.5±4
Output Offset VoltageVOSTA = +25°C (Volume at 0dB,
OUTMODE = 1, ΔIN_ = 0)±1.5mV
Into shutdown-70
Click-and-Pop LevelKCP
Peak voltage, TA =
+25°C, A-weighted, 32
samples per second,
volume at mute (Note 4)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 4)PSRRTA = +25°C, PVDD =
VDD
f = 20kHz,
100mVP-P ripple55
ZSPK = 8Ω +
68µH, VDD = 3.7V725
ZSPK = 8Ω +
68µH, VDD = 3.3V560
ZSPK = 8Ω +
68µH, VDD = 3.0V465
ZSPK = 4Ω +
33µH, VDD = 3.7V825
Output Power (Note 5)POUTTHD+N ≤ 1%
ZSPK = 4Ω +
33µH, VDD = 3.0V770
Total Harmonic Distortion Plus
NoiseTHD+Nf = 1kHz, POUT = 350mW, TA = +25°C,
ZSPK = 8Ω + 68µH0.05%
ΔIN_ = 0
(single-ended)92A-weighted,
OUTMODE = 1, 3,
4, 6ΔIN_ = 1 (differential)94
ΔIN_ = 0
(single-ended)88
Signal-to-Noise RatioSNR
A-weighted,
OUTMODE = 7, 9
ΔIN_ = 1 (differential)92
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS = 0,
SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND.
SDA and SCL pullup voltage = 3.3V. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= TMINto TMAX, unless otherwise noted. Typical
values are at TA= +25°C.) (Note 3)
MAX9877AERP
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS = 0,
SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND.
SDA and SCL pullup voltage = 3.3V. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= TMINto TMAX, unless otherwise noted. Typical
values are at TA= +25°C.) (Note 3)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Spread-spectrum modulation mode,
OSC = 00
±60
Fixed-frequency mode, OSC = 011100Output Frequency
Fixed-frequency mode, OSC = 10700
kHz
Current Limit1.5A
EfficiencyηPOUT = 600mW, f = 1kHz87%
Speaker GainAV11.512.012.5dB
Output NoiseA-weighted, OUTMODE = 1, ΔIN_ = 0
(Note 4)63µVRMS
HEADPHONE AMPLIFIERS (OUTMODE = 2)
TA = +25°C (volume at mute)±0.15±0.6Output Offset VoltageVOSTA = +25°C (volume at 0dB)±1.6mV
Into shutdown-80
Click-and-Pop LevelKCP
Peak voltage, TA =
+25°C, A-weighted,
32 samples per
second. volume at
mute (Note 4)
Out of shutdown-80
dBV
PVDD = VDD = 2.7V
to 5.25V7085
f = 217Hz,
VRIPPLE = 100mVP-P84
f = 1kHz,
VRIPPLE = 100mVP-P80
Power-Supply Rejection Ratio
(Note 4)PSRRTA = +25°C, PVDD =
VDD
f = 20kHz,
VRIPPLE = 100mVP-P62
RHP = 16Ω53Output PowerPOUTTHD+N ≤ 1%RHP = 32Ω27mW
Headphone GainAV-0.40+0.4dB
Channel-to-Channel Gain
Tracking
TA = +25°C, HPL to HPR, volume at 0dB,
OUTMODE = 2, 5; ΔIN_ = 0±0.3±2.5%
RHP = 32Ω (POUT = 10mW, f = 1kHz)0.016
Total Harmonic Distortion Plus
NoiseTHD+NRHP = 16Ω (POUT = 10mW, f = 1kHz),
TA = +25°C0.03%
ΔIN_ = 0
(single-ended)98A-weighted,
OUTMODE = 2, 3,
5, 6; RHP = 16ΩΔIN_ = 1 (differential)98
ΔIN_ = 0
(single-ended)96
Signal-to-Noise RatioSNR
A-weighted, RHP =
16Ω, OUTMODE =
8, 9
MAX9877AERP
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS = 0,
SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND.
SDA and SCL pullup voltage = 3.3V. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= TMINto TMAX, unless otherwise noted. Typical
values are at TA= +25°C.) (Note 3)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Slew RateSR0.35V/µs
Capacitive DriveCL100pF
CrosstalkHPL to HPR, HPR to HPL, f = 20Hz to 20kHz65dB
Spread-spectrum modulation mode,
OSC = 00
±30
Fixed-frequency mode, OSC = 01430550670Charge-Pump Frequency
Fixed-frequency mode, OSC = 10220350500
kHz
VOLUME CONTROL
Minimum Setting_VOL = 1-75dB
Maximum Setting_VOL = 310dB
PGAIN_ = 000
PGAIN_ = 019Preamp GainInput A or B
PGAIN_ = 1020
Speaker100Mute Attenuationf = 1kHz, _VOL = 0Headphone110dB
Zero-Crossing Detection TimeoutZCD = 160ms
ANALOG SWITCH
TA = +25°C1.64.5
On-ResistanceRON
IRXIN_ = 20mA, RXIN_
= 0V and VDD,
BYPASS = 1TA = TMIN to TMAX5.2
Series resistance
is 9.1Ω per switch0.050.25
Total Harmonic Distortion
VDIF = 2VP-P,
VCM = VDD/2,
f = 1kHz, BYPASS = 1,
TA = +25°CNo series resistors0.3
Off-Isolation
BYPASS = 0, RXIN+ and RXIN- to GND =
50Ω, ZSPK = 8Ω + 68µH, f = 10kHz,
referred to speaker output signaldB
DIGITAL INPUTS
Input-Voltage High (SDA, SCL)VH1.4V
Input-Voltage Low (SDA, SCL)VL0.4V
Input-Voltage Low (BIAS)VBL0.15V
Input Hysteresis (SDA, SCL)VHYS80mV
SDA, SCL Input CapacitanceCIN4pF
Input Leakage CurrentIINSDA, SCL+1.0µA
BIAS Pullup CurrentIBIAS94µA
DIGITAL OUTPUTS (SDA Open Drain)
Output Low Voltage SDAVOLISINK = 3mA0.4VVH(MIN) to VL(MAX) bus capacitance = 10pF
MAX9877AERP
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS = 0,
SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to GND.
SDA and SCL pullup voltage = 3.3V. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= TMINto TMAX, unless otherwise noted. Typical
values are at TA= +25°C.) (Note 3)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
2-WIRE INTERFACE TIMING
External Pullup Voltage Range:
SDA and SCL1.73.6V
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
Maximum Receive SCL/SDA Rise
TimetR300ns
Maximum Receive SCL/SDA Fall
TimetF300ns
Setup Time for STOP ConditiontSU:STO0.6µs
Capacitive Load for Each Bus
LineCb400pF
Note 3:All devices are 100% production tested at room temperature. All temperature limits are guaranteed by design.
Note 4:Amplifier inputs are AC-coupled to GND.
Note 5:Output levels higher than 825mW are not recommended for extended durations. Production tested with ZSPK= 8Ω+ 68µH only.
MAX9877AERP
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9877A toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
HEADPHONE ONLY
INPUTS AC-COUPLED TO GND
OUTMODE = 8
VSDA = VSCL = 3.3V
fOSC = 1176kHz SREAD-SPECTRUM MODE
fOSC = 1100kHz
fOSC = 700kHz
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9877A toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
SPEAKER ONLY
INPUTS AC-COUPLED TO GND
OUTMODE = 7
VSDA = VSCL = 3.3V
fOSC = 1176kHz
SPREAD-SPECTRUM MODE
fOSC = 1100kHz
fOSC = 700kHz
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9877A toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
fOSC = 1176kHz
SPREAD-SPECTRUM MODE
fOSC = 1100kHz
fOSC = 700kHz
HEADPHONE AND SPEAKER
INPUTS AC-COUPLED TO GND
OUTMODE = 9
VSDA = VSCL = 3.3V
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX9877A toc04
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (
INPUTS AC-COUPLED TO GND
VSDA = VSCL = 3.3V
VOLUME ATTENUATION
vs. _VOL CONTROL CODE
MAX9877A toc05
_VOL CONTROL CODE
VOLUME ATTENUATION (dB)1510202530
fIN = 1kHz
MEASURED AT HPL
AND HPR
Typical Operating Characteristics
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS =
0, SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to
GND. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
GENERAL
MAX9877AERP
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877A toc10
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01100k
VDD = PVDD = 3.7V
POUT = 200mW
ZSPK = 8Ω + 68μH
fOSC = 700kHz
fOSC = 1176kHz
fOSC = 1100kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc11
OUTPUT POWER (W)
THD+N (%)
fIN = 20Hz
fIN = 1kHz
fIN = 6kHz
VDD = PVDD = 5V
ZSPK = 8Ω + 68μH
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc12
THD+N (%)
VDD = PVDD = 5V
ZSPK = 4Ω + 33μH
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
fIN = 6kHzfIN = 20Hz
fIN = 1kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc13
THD+N (%)
fIN = 6kHz
fIN = 20Hz
fIN = 1kHz
VDD = PVDD = 3.7V
ZSPK = 8Ω + 68μH
Typical Operating Characteristics (continued)
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS =
0, SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to
GND. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
SPEAKER AMPLIFIER
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877A toc06
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01100k
VDD = PVDD = 3.7V
ZSPK = 8Ω + 68μH
POUT = 200mW
POUT = 675mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877A toc07
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01100k
VDD = PVDD = 3.7V
ZSPK = 4Ω + 33μH
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
POUT = 1100mW
POUT = 650mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877A toc08
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01100k
POUT = 425mW
POUT = 200mW
VDD = PVDD = 3V
ZSPK = 8Ω + 68μH
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877A toc09
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01100k
POUT = 700mW
POUT = 250mW
VDD = PVDD = 3V
ZSPK = 4Ω + 33μH
MAX9877AERP
EFFICIENCY
vs. OUTPUT POWER
MAX9877A toc19
OUTPUT POWER (W)
EFFICIENCY (%)
VDD = PVDD = 5V
fIN = 1kHz
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
ZSPK = 8Ω + 68μHZSPK = 4Ω + 33μH
EFFICIENCY
vs. OUTPUT POWER
MAX9877A toc20
EFFICIENCY (%)
VDD = PVDD = 3.7V
fIN = 1kHz
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
ZSPK = 8Ω + 68μHZSPK = 4Ω + 33μH
EFFICIENCY
vs. OUTPUT POWER
MAX9877A toc21
EFFICIENCY (%)
VDD = PVDD = 3.7V
fIN = 1kHz
ZSPK = 8Ω + 68μH
fOSC = 700kHz
fOSC = 1176kHz AND 1100kHz
Typical Operating Characteristics (continued)
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS =
0, SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to
GND. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc14
OUTPUT POWER (W)
THD+N (%)
VDD = PVDD = 3.7V
ZSPK = 4Ω + 33μH
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
fIN = 6kHzfIN = 20Hz
fIN = 1kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc15
OUTPUT POWER (mW)
THD+N (%)
fIN = 6kHz
fIN = 20Hz
fIN = 1kHz
VDD = PVDD = 3V
ZSPK = 8Ω + 68μH
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc16
OUTPUT POWER (W)
THD+N (%)
VDD = PVDD = 3V
ZSPK = 4Ω + 33μH
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
fIN = 6kHz
fIN = 20Hz
fIN = 1kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc17
OUTPUT POWER (mW)
THD+N (%)
VDD = PVDD = 3.7V
fIN = 1kHz
ZSPK = 8Ω + 68μH
fOSC = 1176kHz SSM
fOSC = 700kHz
fOSC = 1100kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc18
OUTPUT POWER (mW)
THD+N (%)
VDD = PVDD = 3.7V
fIN = 6kHz
ZSPK = 8Ω + 68μH
fOSC = 1176kHz SSM
fOSC = 700kHz
fOSC = 1100kHz
MAX9877AERP
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
Typical Operating Characteristics (continued)
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS =
0, SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to
GND. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
IN-BAND OUTPUT SPECTRUM
MAX9877A toc28
AMPLITUDE (dBV)105
fOSC = 1100kHz
fIN = 1kHz
IN-BAND OUTPUT SPECTRUM
MAX9877A toc29
AMPLITUDE (dBV)105
fOSC = 700kHz
fIN = 1kHz
EFFICIENCY
vs. OUTPUT POWER
MAX9877A toc22
OUTPUT POWER (mW)
EFFICIENCY (%)
VDD = PVDD = 3V
fIN = 1kHz
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
ZSPK = 8Ω + 68μHZSPK = 4Ω + 33μH
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9877A toc23
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
10% THD+N
1% THD+N
VDD = PVDD
ZSPK = 4Ω + 33μH
DASHED LINES ARE LIMITED
BY THE ABS. MAX RATINGS
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9877A toc24
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
VDD = PVDD
ZSPK = 8Ω + 68μH
10% THD+N
1% THD+N
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9877A toc25
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
VDD = PVDD = 3.7V
fIN = 1kHz
ZSPK = LOAD + 68μH
10% THD+N
1% THD+N
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9877A toc26
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
VDD = PVDD = 3V
fIN = 1kHz
ZSPK = LOAD + 68μH
10% THD+N
1% THD+N
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9877A toc27
FREQUENCY (Hz)
PSRR (dB)
10k1k100
-100100k
VDD = PVDD = 3.7V
VRIPPLE = 100mVP-P
INPUTS AC-COUPLED TO GND
MAX9877AERP
Typical Operating Characteristics (continued)
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS =
0, SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to
GND. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
IN-BAND OUTPUT SPECTRUM
MAX9877A toc30
FREQUENCY (kHz)
AMPLITUDE (dBV)105
fOSC = 1176kHz
fIN = 1kHz
WIDEBAND OUTPUT SPECTRUM
MAX9877A toc31
FREQUENCY (MHz)
AMPLITUDE (dBV)
fOSC = 1100kHz
INPUTS AC-COUPLED TO GND
WIDEBAND OUTPUT SPECTRUM
MAX9877A toc32
FREQUENCY (MHz)
AMPLITUDE (dBV)
fOSC = 700kHz
INPUTS AC-COUPLED TO GND
WIDEBAND OUTPUT SPECTRUM
MAX9877A toc33
FREQUENCY (MHz)
AMPLITUDE (dBV)
fOSC = 1176kHz
INPUTS AC-COUPLED TO GND
HARDWARE SHUTDOWN RESPONSE
MAX9877A toc34VBIAS
500mV/div
20ms/div
OUT+ - OUT-
1V/div
SOFTWARE SHUTDOWN
ON- AND OFF-RESPONSE
MAX9877A toc35VSDA
2V/div
20ms/div
OUT+ - OUT-
1V/div
MAX9877AERP
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
Typical Operating Characteristics (continued)
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS =
0, SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to
GND. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
HEADPHONE AMPLIFIER
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877A toc36
FREQUENCY (Hz)
THD+N (%)
0.11001k10k100k
VDD = PVDD = 3.7V
RHP = 32Ω
POUT = 10mW
POUT = 20mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877A toc37
FREQUENCY (Hz)
THD+N (%)
0.11001k10k100k
VDD = PVDD = 3.7V
RHP = 16Ω
POUT = 20mW
POUT = 40mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877A toc38
FREQUENCY (Hz)
THD+N (%)
0.11001k10k100k
VDD = PVDD = 3V
RHP = 32Ω
POUT = 10mW
POUT = 20mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877A toc39
FREQUENCY (Hz)
THD+N (%)
0.11001k10k100k
VDD = PVDD = 3V
RHP = 16Ω
POUT = 15mW
POUT = 30mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc40
OUTPUT POWER (mW)
THD+N (%)2010
VDD = PVDD = 3.7V
RHP = 32Ω
fIN = 20Hz
fIN = 1kHzfIN = 6kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc41
OUTPUT POWER (mW)
THD+N (%)
VDD = PVDD = 3.7V
RHP = 16Ω
fIN = 20Hz AND 1kHz
fIN = 6kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc42
THD+N (%)2010
VDD = PVDD = 3V
RHP = 32Ω
fIN = 20Hz
fIN = 1kHzfIN = 6kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc43
THD+N (%)
VDD = PVDD = 3V
RHP = 16Ω
fIN = 20Hz AND 1kHz
fIN = 6kHz
MAX9877AERP
Typical Operating Characteristics (continued)
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS =
0, SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to
GND. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9877A toc46
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
fIN = 1kHz
RHP = 32Ω
10% THD+N
1% THD+N
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9877A toc47
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
fIN = 1kHz
RHP = 16Ω
10% THD+N
1% THD+N
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9877A toc48
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
VDD = PVDD = 3.7V
fIN = 1kHz
10% THD+N
1% THD+N
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9877A toc49
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
VDD = PVDD = 3V
fIN = 1kHz
10% THD+N
1% THD+N
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9877A toc50
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
VDD = PVDD = 3V
OSC = 10
fIN = 1kHz
1% THD+N
C1 = C2 = 2.2μF
C1 = C2 = 0.47μF
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9877A toc51
PSRR (dB)
-301001k10k100k
VDD = PVDD = 3.7V
VRIPPLE = 100mVP-P
RHP = 32Ω
INPUTS AC-COUPLED TO GND
HPR
HPL
POWER DISSIPATION
vs. OUTPUT POWER
MAX9877A toc44
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
VDD = PVDD = 3.7V
fIN = 1kHz
POUT = PHPL + PHPR
RHP = 32Ω
RHP = 16Ω
POWER DISSIPATION
vs. OUTPUT POWER
MAX9877A toc45
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
VDD = PVDD = 3V
fIN = 1kHz
POUT = PHPL + PHPR
RHP = 32Ω
RHP = 16Ω
MAX9877AERP
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
Typical Operating Characteristics (continued)
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS =
0, SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to
GND. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX9877A toc55
FREQUENCY (Hz)
CMRR (dB)100k10k1k100
VDD = PVDD = 3.7V
CMRR = 20log(ADM/ACM)
+9dB
+20dB
0dB
HARDWARE SHUTDOWN RESPONSE
MAX9877A toc56
VBIAS
500mV/div
HPL
500mV/div
20ms/div
HPR
500mV/div
SOFTWARE SHUTDOWN
ON- AND OFF-REPSONSE
MAX9877A toc57
VBIAS
500mV/div
HPL
500mV/div
20ms/div
HPR
500mV/div
OUTPUT SPECTRUM
MAX9877A toc52
FREQUENCY (kHz)
AMPLITUDE (dBV)
VDD = PVDD = 3.7V
fIN = 1kHz
RHP = 32Ω
OUTPUT SPECTRUM
MAX9877A toc53
FREQUENCY (kHz)
AMPLITUDE (dBV)
VDD = PVDD = 3.7V
fIN = 1kHz
RHP = 16Ω
CROSSTALK vs. FREQUENCY
MAX9877A toc54
FREQUENCY (Hz)
CROSSTALK (dB)
-80100k10k1k100
VDD = PVDD = 3.7V
VINA_ = 1VP-P
RHP = 16Ω
HPR TO HPL
HPL TO HPR
MAX9877AERP
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifierypical Operating Characteristics (continued)
(VDD= PVDD= 3.7V, VGND= VPGND= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, BYPASS =
0, SHDN= 1. Speaker loads (ZSPK) connected between OUT+ and OUT-. Headphone loads (RHP) connected from HPL or HPR to
GND. ZSPK= ∞, RHP= ∞. C1 = C2 = CBIAS= 1µF. TA= +25°C, unless otherwise noted.)
ANALOG SWITCH
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc58
OUTPUT POWER (mW)
THD+N (%)
EXTERNAL CLASS AB AMPLIFIER
CONNECTED DIRECTLY TO RXIN+
AND RXIN-
f = 6kHzf = 20Hz
f = 1kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877A toc59
OUTPUT POWER (mW)
THD+N (%)
EXTERNAL CLASS AB AMPLIFIER
CONNECTED WITH 9Ω RESISTORS
IN SERIES WITH RXIN+ AND RXIN-
f = 6kHz
f = 20Hz AND 1kHz
MAX9877AERP
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
Pin Description
PINNAMEFUNCTIONHPRRight Headphone OutputHPLLeft Headphone OutputVSSHeadphone Amplifier Negative Power Supply. Bypass with a 1µF capacitor to PGND.C1NCharge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor between C1P and C1N.C1PCharge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor between C1P and C1N.VDDAnalog Supply. Connect to PVDD. Bypass with a 1µF capacitor to GND.BIASCommon-Mode Bias. Bypass to GND with a 1µF capacitor. Pulse low to reset the part and place in
shutdown (see the Typical Application Circuit).SDASerial-Data Input. Connect a pullup resistor from SDA to a 1.7V to 3.6V supply.RXIN+Receiver Bypass Positive InputOUT+Positive Speaker OutputINB2Input B2. Right input or positive input (see the Differential Input Configuration (ΔIN_) section).INB1Input B1. Left input or negative input (see the Differential Input Configuration (ΔIN_) section).SCLSerial-Clock Input. Connect a pullup resistor from SCL to a 1.7V to 3.6V supply.PGNDPower GroundPVDDClass D and Charge-Pump Power Supply. Bypass with a 1µF capacitor to PGND.INA2Input A2. Right input or positive input (see the Differential Input Configuration (ΔIN_) section).INA1Input A1. Left input or negative input (see the Differential Input Configuration (ΔIN_) section).GNDAnalog GroundRXIN-Receiver Bypass Negative InputOUT-Negative Speaker Output
Detailed Description
Signal Path
The MAX9877A signal path consists of flexible inputs,
signal mixing, volume control, and output amplifiers
(Figure 1).
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, +9dB,
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 7). The volume con-
trol stages provide up to 75dB attenuation. The
headphone amplifier is configured as a unity-gain
buffer while the speaker amplifier provides +12dB of
additional gain.
When an input is configured as mono differential it can
be routed to the speaker or to both headphones. When
an input is stereo, it is mixed to mono without attenuation
for the speaker and kept stereo for the headphones.
When the application does not require the use of both
INA_ and INB_, the SNR of the MAX9877A 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 MAX9877A form a high-
pass filter preventing audible noise from coupling into
the outputs.
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