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MAX9820
DirectDrive Headphone Amplifier with External Gain
General DescriptionThe MAX9820 Windows Vista®-compliant stereo head-
phone amplifier is designed for portable equipment
where board space is at a premium. It features Maxim’s
DirectDrive®architecture to produce a ground-refer-
enced output from a single supply, eliminating the large
output-coupling capacitors required by conventional
single-supply headphone amplifiers.
The MAX9820 features an undervoltage lockout that
prevents over discharging of the battery during
brownout conditions, click-and-pop suppression that
eliminates audible transients on startup, a low-power
shutdown mode, and thermal-overload and short-circuit
protection. Additionally, the MAX9820 suppresses RF
radiation received by input and supply traces acting as
antennas and prevents the amplifier from demodulating
the coupled noise.
The MAX9820 is available in a 10-pin TDFN package
(3mm x 3mm x 0.8mm) and specified over the -40°C to
+85°C extended temperature range.
ApplicationsCell Phones
MP3 Players
Notebook PCs
PDAs
FeaturesClickless/Popless OperationHigh RF Noise RejectionWindows Vista Premium Mobile Compliant2.7V to 5.5V Single-Supply Operation95mW Output Power (32Ω, VDD= 5V)Low-Current Shutdown Mode, < 1µALow 3mA (VDD= 3.3V) Quiescent CurrentSpace-Saving, 3mm x 3mm, 10-Pin TDFN Package
MAX9820
DirectDrive Headphone Amplifier
with External Gain19-4666; Rev 0; 7/09
EVALUATION KIT
AVAILABLEGND
VDD
INL
C1P
VSS
OUTL
MAX9820C1NINROUTR*EP
*EXPOSED PAD.
TDFNTOP VIEW
SHDN
Pin Configuration
Ordering Information
PARTTEMP RANGEPIN-
PACKAGETOP MARKMAX9820ETB+-40°C to +85°C10 TDFN-EP*AUU
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
LEFT
AUDIO
INPUT
RIGHT
AUDIO
INPUT
SHDN
MAX9820DirectDrive OUTPUTS
ELIMINATE DC-BLOCKING
CAPACITORS
Simplified Block DiagramWindows Vista is a registered trademark of Microsoft Corp.
DirectDrive is a registered trademark of Maxim Integrated Products, Inc.
MAX9820
DirectDrive Headphone Amplifier
with External Gain
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= VSHDN= 5V, VGND= 0V, RIN= RFB= 40.2kΩ(gain = -1V/V), C1 = C2 = 1µF, C3 = 10µF, RLOAD= ∞, TA= -40°C to +85°C,
unless otherwise noted. Typical values are at TA= +25°C, unless otherwise noted.) (Note 2)
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.
VDDto GND..............................................................-0.3V to +6V
C1P to GND................................................-0.3V to (VDD+ 0.3V)
C1N to GND................................................(VSS- 0.3V) to +0.3V
VSSto GND...............................................................-6V to +0.3V
OUTR, OUTL to GND.............................................................±3V
SHDNto GND...........................................................-0.3V to +6V
INR, INL to GND.........................................-0.3V to (VDD+ 0.3V)
OUTR, OUTL Short Circuit to GND, VDD....................Continuous
Short Circuit Between OUTL and OUTR....................Continuous
Continuous Input Current (Into All Other Pins).................±20mA
Continuous Power Dissipation (TA= +70°C)
10-Pin TDFN Single-Layer PCB (derate 18.5mW/°C
above +70°C)........................................................1481.5mW
Junction-to-Case Thermal Resistance (θJC) (Note 1)
10-Pin TDFN ................................................................8.5°C/W
Junction-to-Ambient Thermal Resistance (θJA) (Note 1)
10-Pin TDFN...............................................................41.0°C/W
Continuous Power Dissipation (TA= +70°C)
10-Pin TDFN Multilayer PCB (derate 24.4mW/°C
above +70°C)...........................................................1951mW
Junction-to-Case Thermal Resistance (θJC) (Note 1)
10-Pin TDFN.................................................................9.0°C/W
Junction-to-Ambient Thermal Resistance (θJA) (Note 1)
10-Pin TDFN...............................................................41.0°C/W
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
GENERALSupply Voltage RangeVDDGuaranteed by PSRR test2.75.5V
Undervoltage LockoutUVLO2.2V
VDD = 3.3V3.04.6Quiescent CurrentIDDVDD = 5V4.06.0mA
Shutdown CurrentISHDNVSHDN = 0V, TA = +25°C< 0.11µA
Output Signal Attenuation in
ShutdownVSHDN = 0V, VIN = 1VRMS, RLOAD = 10kΩ-110dBV
Output Impedance in
ShutdownVSHDN = 0V0.6kΩ
Turn-On TimetON0.56ms
Output Offset VoltageVOSTA = +25°C (Note 3)±0.1±0.5mV
Into shutdown-79ZLOAD = 32Ω + 1µH, peak
voltage, A-weighted, 32 samples
per second (Notes 3, 4)Out of
shutdown-77
Into shutdown-62
Click-and-Pop LevelKCP
ZLOAD = 10kΩ, peak voltage,
A-weighted, 32 samples per
second (Notes 3, 4)Out of
shutdown-58
dBV
Note 1: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.
MAX9820
DirectDrive Headphone Amplifier
with External Gain
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSVDD = 2.7V to 5.5V, TA = +25°C (Note 3)7590
f = 1kHz, 200mVP-P (Note 3)73Power-Supply Rejection RatioPSRR
f = 20kHz, 200mVP-P (Note 3)55
VDD = 3.6V45ZLOAD= 32Ω + 1µH, f = 1kHz,
THD+N = 1%VDD = 5.0V95
VDD = 3.6V32Output PowerPOUT
ZLOAD= 16Ω + 1µH, f = 1kHz,
THD+N = 1%VDD = 5.0V75
ZLOAD = 16Ω + 1µH, f = 1kHz, POUT = 20mW0.014
ZLOAD = 32Ω + 1µH, f = 1kHz, POUT = 20mW0.005Total Harmonic Distortion
Plus NoiseTHD+N
ZLOAD = 10kΩ, f = 1kHz, VOUT = 1VRMS0.001
Signal-to-Noise RatioSNRZLOAD = 32Ω + 1µH, POUT = 25mW, A-weighted105dB
Output NoiseVNOISEA-weighted (Note 3)9µV
ZLOAD = 32Ω + 1µH
FS = 0.300VRMS,
VOUT = 30mVRMS
CrosstalkL to R, R to L,
BW = 20Hz to 15kHzZLOAD = 10kΩ
FS = 0.707VRMS,
VOUT = 70.7mVRMS
Capacitive Load DriveCLNo sustained oscillations200pF
Oscillator FrequencyfOSCTA = +25°C300500800kHz
Thermal Shutdown145°C
Thermal Shutdown Hysteresis15°C
DIGITAL INPUT (SHDN)Input Voltage HighVINH1.2V
Input Voltage LowVINL0.3V
Input Leakage CurrentILEAKAGE TA = +25°C±1µA
ELECTRICAL CHARACTERISTICS (continued)(VDD= VSHDN= 5V, VGND= 0V, RIN= RFB= 40.2kΩ(gain = -1V/V), C1 = C2 = 1µF, C3 = 10µF, RLOAD= ∞, TA= -40°C to +85°C,
unless otherwise noted. Typical values are at TA= +25°C, unless otherwise noted.) (Note 2)
Note 2:All specifications are 100% tested at TA= +25°C; temperature limits are guaranteed by design.
Note 3:The amplifier inputs are AC-coupled to GND.
Note 4:Mode transitions are controlled by SHDN.
MAX9820
DirectDrive Headphone Amplifier
with External Gain
Typical Operating Characteristics(VDD= VSHDN= 5V, VGND= 0V, RIN= RFB= 40.2kΩ(gain = -1V/V), C1 = C2 = 1µF, C3 = 10µF, RLOAD= ∞. Typical values are at TA
= +25°C, unless otherwise noted.)
THD+N vs. OUTPUT POWER
MAX9820 toc01
OUTPUT POWER (W)
THD+N (%)
VDD = 5.0V
RLOAD = 16I
LLOAD = 1FH
f = 100Hz
f = 1kHz
f = 6kHz
THD+N vs. OUTPUT POWER
MAX9820 toc02
OUTPUT POWER (W)
THD+N (%)
VDD = 5.0V
RLOAD = 32I
LLOAD = 1FH
f = 100Hz
f = 1kHz
f = 6kHz
THD+N vs. OUTPUT POWER
MAX9820 toc03
OUTPUT POWER (W)
THD+N (%)
VDD = 3.6V
RLOAD = 16I
LLOAD = 1FH
f = 100Hz
f = 1kHz
f = 6kHz
THD+N vs. OUTPUT POWER
MAX9820 toc04
OUTPUT POWER (W)
THD+N (%)
VDD = 3.6V
RLOAD = 32I
LLOAD = 1FH
f = 100Hz
f = 1kHz
f = 6kHz
THD+N vs. FREQUENCY
MAX9820 toc05
FREQUENCY (Hz)
10,000100010010100,000
THD+N (%)
VDD = 5.0V
RLOAD = 16I
LLOAD = 1FH
POUT = 60mW
POUT = 20mW
THD+N vs. FREQUENCY
MAX9820 toc06
FREQUENCY (Hz)
10,000100010010100,000
THD+N (%)
VDD = 5.0V
RLOAD = 32I
LLOAD = 1FH
POUT = 60mW
POUT = 20mW
MAX9820
DirectDrive Headphone Amplifier
with External GainTHD+N vs. FREQUENCY
MAX9820 toc07
FREQUENCY (Hz)
10,000100010010100,000
THD+N (%)
VDD = 3.6V
RLOAD = 16I
LLOAD = 1FH
POUT = 20mW
POUT = 10mW
THD+N vs. FREQUENCY
MAX9820 toc08
FREQUENCY (Hz)
10,000100010010100,000
THD+N (%)
VDD = 3.6V
RLOAD = 32I
LLOAD = 1FH
POUT = 30mW
POUT = 10mW
VISTA THD+N vs. FREQUENCY
MAX9820 toc09
FREQUENCY (Hz)
THD+N (dBFS)
10,0001000100
-120100,000
VDD = 5.0V
RLOAD = 32I
LLOAD = 1FH
VOUT = -3dBFS
FS = 300mVRMS
FS = 1VRMS
VISTA THD+N vs. FREQUENCY
MAX9820 toc10
FREQUENCY (Hz)
THD+N (dBFS)
10,0001000100
-120100,000
VDD = 5.0V
RLOAD = 10kI
LLOAD = 1µH
VOUT = -3dBFS
FS = 707mVRMS
FS = 1VRMS
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9820 toc11
SUPPLY VOLTAGE (V)
OUT
(mW)
RLOAD = 16I
LLOAD = 1µH
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. SUPPLY VOLTAGE
MAX9820 toc12
SUPPLY VOLTAGE (V)
OUT
(mW)
RLOAD = 32I
LLOAD = 1µH
THD+N = 10%
THD+N = 1%
Typical Operating Characteristics(VDD= VSHDN= 5V, VGND= 0V, RIN= RFB= 40.2kΩ(gain = -1V/V), C1 = C2 = 1µF, C3 = 10µF, RLOAD= ∞. Typical values are at TA
= +25°C, unless otherwise noted.)
MAX9820
DirectDrive Headphone Amplifier
with External Gain
Typical Operating Characteristics (continued)(VDD= VSHDN= 5V, VGND= 0V, RIN= RFB= 40.2kΩ(gain = -1V/V), C1 = C2 = 1µF, C3 = 10µF, RLOAD= ∞. Typical values are at TA
= +25°C, unless otherwise noted.)
OUTPUT POWER vs. LOAD RESISTANCE
MAX9820 toc13
LOAD RESISTANCE (I)
OUT
(mW)
VDD = 5.0V
LLOAD = 1µH
THD+N = 10%
THD+N = 1%
OUTPUT POWER vs. LOAD RESISTANCE
LOAD RESISTANCE (I)
OUT
(mW)
VDD = 3.6V
LLOAD = 1µH
THD+N = 10%
THD+N = 1%
MAX9820 toc14
POWER DISSIPATION
vs. OUTPUT POWER
MAX9820 toc15
OUTPUT POWER PER CHANNEL (mW)
POWER DISSIPATION (mW)
VDD = 5.0V
LLOAD = 1µH
RLOAD = 16I
RLOAD = 32I
POWER DISSIPATION
vs. OUTPUT POWER
MAX9820 toc16
OUTPUT POWER PER CHANNEL (mW)
POWER DISSIPATION (mW)
VDD = 3.6V
LLOAD = 1µH
RLOAD = 16I
RLOAD = 32I
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9820 toc17
FREQUENCY (Hz)
PSRR (dB)
10,0001000100
-120100,000
LEFT CHANNEL
RIGHT CHANNEL
VRIPPLE = 200mVP-P
POWER-SUPPLY REJECTION RATIO
vs. SUPPLY VOLTAGE
MAX9820 toc18
SUPPLY VOLTAGE (V)
PSRR (dB)
VRIPPLE = 200mVP-P
f = 1kHz
RIGHT CHANNEL
LEFT CHANNEL
MAX9820
DirectDrive Headphone Amplifier
with External Gain
Typical Operating Characteristics (continued)(VDD= VSHDN= 5V, VGND= 0V, RIN= RFB= 40.2kΩ(gain = -1V/V), C1 = C2 = 1µF, C3 = 10µF, RLOAD= ∞. Typical values are at TA
= +25°C, unless otherwise noted.)
VISTA CROSSTALK vs. FREQUENCY
MAX9820 toc19
FREQUENCY (Hz)
CROSSTALK (dB)
10,0001000100
-120100,000
RLOAD = 32I
LLOAD = 1µH
FS = 300mVRMS
VOUT = -20dBFS
LEFT TO RIGHT
RIGHT TO LEFT
VISTA CROSSTALK vs. FREQUENCY
MAX9820 toc20
FREQUENCY (Hz)
CROSSTALK (dB)
10,0001000100
-140100,000
LEFT TO RIGHT
RIGHT TO LEFT
RLOAD = 1kI
LLOAD = 1µH
FS = 707mVRMS
VOUT = -20dBFS
OUTPUT SPECTRUM
MAX9820 toc21
FREQUENCY (kHz)
OUTPUT MAGNITUDE (dBV)161412108642
f = 1kHz
RLOAD = 32I
LLOAD = 1µH
QUIESCENT CURRENT
vs. SUPPLY VOLTAGE
MAX9820 toc22
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX9820 toc23
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (nA)
EXITING SHUTDOWN
MAX9820 toc24
OUT_
1V/div
SHDN
2V/div
100Fs/div
ENTERING SHUTDOWN
MAX9820 toc25
OUT_
1V/div
SHDN
2V/div
100Fs/div
