MAX9877EWP+TG45 Fast Delivery |IC PHOENIX CO.,LIMITED

MAX9877EWP+TG45 ,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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MAX9877EWP+TG45
Low RF Susceptibility Mono Audio Subsystem with DirectDrive Headphone Amplifier
General Description
The MAX9877 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 MAX9877 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 modu-
lation greatly reduces EMI while eliminating the need for
output filtering used in traditional Class D devices.
The stereo Class AB headphone amplifier in the
MAX9877 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 MAX9877.
The MAX9877 is available in a thermally efficient,
space-saving 20-bump WLP package.
Applications
Cell Phones
Portable 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 WLP
Package
MAX9877
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
MAX9877
Simplified Block Diagram
HPLVSSC1NHPR34
C1P
BIASSDARXIN+VDDOUT+
INB1SCLPGNDINB2PVDD
INA1GNDRXIN-INA2OUT-
TOP VIEW(BUMP SIDE DOWN)
Pin Configuration
19-4076; Rev 0; 7/08
EVALUATION KIT
AVAILABLE
Ordering Information
PARTTEMP RANGEPIN - PA C K A G E
MAX9877EWP+TG45-40°C to +85°C20 WLP (5x4)
+Denotes a lead-free package.
T = Tape and reel.
G45 indicates protective die coating.
MAX9877
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 WLP, 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-high; TA = +25°C1022µA
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
MAX9877
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)
MAX9877
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)0.016Total 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
MAX9877
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; TA = +25°C±1.0µA
BIAS Pullup CurrentIBIAS94µA
DIGITAL OUTPUTS (SDA Open Drain)
Output Low Voltage SDAVOLISINK = 3mA0.4VVH(MIN) to VL(MAX) bus capacitance = 10pF
MAX9877
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.
MAX9877
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9877 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
MAX9877 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
MAX9877 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
MAX9877 toc04
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (
INPUTS AC-COUPLED TO GND
VSDA = VSCL = 3.3V
VOLUME ATTENUATION
vs. _VOL CONTROL CODE
MAX9877 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
MAX9877
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877 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
MAX9877 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
MAX9877 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
MAX9877 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
MAX9877 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
MAX9877 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
MAX9877 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
MAX9877 toc09
FREQUENCY (Hz)
THD+N (%)
10k1k100
0.01100k
POUT = 700mW
POUT = 250mW
VDD = PVDD = 3V
ZSPK = 4Ω + 33μH
MAX9877
EFFICIENCY
vs. OUTPUT POWER
MAX9877 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
MAX9877 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
MAX9877 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
MAX9877 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
MAX9877 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
MAX9877 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
MAX9877 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
MAX9877 toc18
OUTPUT POWER (mW)
THD+N (%)
VDD = PVDD = 3.7V
fIN = 6kHz
ZSPK = 8Ω + 68μH
fOSC = 1176kHz SSM
fOSC = 700kHz
fOSC = 1100kHz
MAX9877
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
MAX9877 toc28
AMPLITUDE (dBV)105
fOSC = 1100kHz
fIN = 1kHz
IN-BAND OUTPUT SPECTRUM
MAX9877 toc29
FREQUENCY (kHz)
AMPLITUDE (dBV)105
fOSC = 700kHz
fIN = 1kHz
EFFICIENCY
vs. OUTPUT POWER
MAX9877 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
MAX9877 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
MAX9877 toc24
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
VDD = PVDD
ZSPK = 8Ω + 68μH
10% THD+N
1% THD+N
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9877 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
MAX9877 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
MAX9877 toc27
FREQUENCY (Hz)
PSRR (dB)
10k1k100
-100100k
VDD = PVDD = 3.7V
VRIPPLE = 100mVP-P
INPUTS AC-COUPLED TO GND
MAX9877
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
MAX9877 toc30
FREQUENCY (kHz)
AMPLITUDE (dBV)105
fOSC = 1176kHz
fIN = 1kHz
WIDEBAND OUTPUT SPECTRUM
MAX9877 toc31
FREQUENCY (MHz)
AMPLITUDE (dBV)
fOSC = 1100kHz
INPUTS AC-COUPLED TO GND
WIDEBAND OUTPUT SPECTRUM
MAX9877 toc32
FREQUENCY (MHz)
AMPLITUDE (dBV)
fOSC = 700kHz
INPUTS AC-COUPLED TO GND
WIDEBAND OUTPUT SPECTRUM
MAX9877 toc33
FREQUENCY (MHz)
AMPLITUDE (dBV)
fOSC = 1176kHz
INPUTS AC-COUPLED TO GND
HARDWARE SHUTDOWN RESPONSE
MAX9877 toc34VBIAS
500mV/div
20ms/div
OUT+ - OUT-
1V/div
SOFTWARE SHUTDOWN
ON- AND OFF-RESPONSE
MAX9877 toc35VSDA
2V/div
20ms/div
OUT+ - OUT-
1V/div
MAX9877
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
MAX9877 toc36
FREQUENCY (Hz)
THD+N (%)
0.11001k10k100k
VDD = PVDD = 3.7V
RHP = 32Ω
POUT = 10mW
POUT = 20mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877 toc37
FREQUENCY (Hz)
THD+N (%)
0.11001k10k100k
VDD = PVDD = 3.7V
RHP = 16Ω
POUT = 20mW
POUT = 40mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877 toc38
FREQUENCY (Hz)
THD+N (%)
0.11001k10k100k
VDD = PVDD = 3V
RHP = 32Ω
POUT = 10mW
POUT = 20mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
MAX9877 toc39
FREQUENCY (Hz)
THD+N (%)
0.11001k10k100k
VDD = PVDD = 3V
RHP = 16Ω
POUT = 15mW
POUT = 30mW
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877 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
MAX9877 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
MAX9877 toc42
THD+N (%)2010
VDD = PVDD = 3V
RHP = 32Ω
fIN = 20Hz
fIN = 1kHzfIN = 6kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9877 toc43
THD+N (%)
VDD = PVDD = 3V
RHP = 16Ω
fIN = 20Hz AND 1kHz
fIN = 6kHz
MAX9877
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
MAX9877 toc46
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
fIN = 1kHz
RHP = 32Ω
10% THD+N
1% THD+N
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX9877 toc47
SUPPLY VOLTAGE (V)
OUTPUT POWER (mW)
fIN = 1kHz
RHP = 16Ω
10% THD+N
1% THD+N
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9877 toc48
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
VDD = PVDD = 3.7V
fIN = 1kHz
10% THD+N
1% THD+N
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9877 toc49
LOAD RESISTANCE (Ω)
OUTPUT POWER (mW)
VDD = PVDD = 3V
fIN = 1kHz
10% THD+N
1% THD+N
OUTPUT POWER
vs. LOAD RESISTANCE
MAX9877 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
MAX9877 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
MAX9877 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
MAX9877 toc45
OUTPUT POWER (mW)
POWER DISSIPATION (mW)
VDD = PVDD = 3V
fIN = 1kHz
POUT = PHPL + PHPR
RHP = 32Ω
RHP = 16Ω
MAX9877
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
MAX9877 toc55
FREQUENCY (Hz)
CMRR (dB)100k10k1k100
VDD = PVDD = 3.7V
CMRR = 20log(ADM/ACM)
+9dB
+20dB
0dB
HARDWARE SHUTDOWN RESPONSE
MAX9877 toc56VBIAS
500mV/div
HPL
500mV/div
20ms/div
HPR
500mV/div
SOFTWARE SHUTDOWN
ON- AND OFF-REPSONSE
MAX9877 toc57VBIAS
500mV/div
HPL
500mV/div
20ms/div
HPR
500mV/div
OUTPUT SPECTRUM
MAX9877 toc52
FREQUENCY (kHz)
AMPLITUDE (dBV)
VDD = PVDD = 3.7V
fIN = 1kHz
RHP = 32Ω
OUTPUT SPECTRUM
MAX9877 toc53
FREQUENCY (kHz)
AMPLITUDE (dBV)
VDD = PVDD = 3.7V
fIN = 1kHz
RHP = 16Ω
CROSSTALK vs. FREQUENCY
MAX9877 toc54
FREQUENCY (Hz)
CROSSTALK (dB)
-80100k10k1k100
VDD = PVDD = 3.7V
VINA_ = 1VP-P
RHP = 16Ω
HPR TO HPL
HPL TO HPR
MAX9877
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
MAX9877 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
MAX9877 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

Partno	Mfg	Dc	Qty	Available	Descript
MAX9877EWP+TG45	MAXIM	N/a	700	avai	Low RF Susceptibility Mono Audio Subsystem with DirectDrive Headphone Amplifier