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MAX9875ERP+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
General Description
The MAX9875 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 MAX9875 delivers up to 725mW from a 3.7V supply
into an 8Ω load 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
MAX9875 uses Maxim’s DirectDrive architecture, that
produces a ground-referenced output from a single sup-
ply, eliminating the need for large DC-blocking capaci-
tors, 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, and
I
2
C control.
The MAX9875 is available in a thermally efficient,
space-saving 20-bump WLP package.
Applications
Cell Phones
Portable Multimedia Players
Features
♦ Low Emissions, Filterless Class D Amplifier
Achieves Better than 10dB Margin Under EN55022
Class B Limits
♦ Low RF Susceptibility Design Rejects TDMA
Noise from GSM Radios
♦ Input Mixer with User-Defined Input Mode
♦ 725mW Speaker Output (R
SPK
= 8Ω, PVDD = 3.7V)
♦ 53mW Headphone Output (R
HP
= 16Ω, V
DD
= 3.7V)
♦ Low 0.05% THD+N at 1kHz (Class D Power
Amplifier)
♦ Low 0.016% THD+N at 1kHz (Headphone
Amplifier)
♦ 87% Efficiency (R
SPK
= 8Ω, P
OUT
= 750mW)
♦ High Speaker Amplifier PSRR (72dB at 217Hz)
♦ High Headphone Amplifier PSRR (84dB at 217Hz)
♦ I
2
C Control
♦ Hardware and Software Shutdown Mode
♦ Click-and-Pop Suppression
♦ Current-Limit and Thermal Protection
♦ Available in a Space-Saving, 2.5mm x 2.0mm WLP
Package
MAX9875
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
________________________________________________________________
Maxim Integrated Products
1
MIXER/MUX
PREAMPLIFIER
SINGLE SUPPLY
2.7V TO 5.25V
I
2
C
INTERFACE
VOLUME
CONTROL
VOLUME
CONTROL
MAX9875
Simplified Block Diagram
WLP
HPL V
SS
C1N
HPR
1
A
B
C
D
2
3
4
C1P
BIAS SDA
N.C.
V
DD
OUT+
INB1 SCL
PGND
INB2
PVDD
INA1 GND
N.C.
INA2
OUT-
5
TOP VIEW
(BUMP SIDE DOWN)
Pin Configuration
19-4536; Rev 0; 3/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
Ordering Information
PART
TEMP RANGE
PIN - PA C K A G E
MAX9875ERP+TG45
-40°C to +85°C
20 WLP (5x4)
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
G45 indicates protective die coating.
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
MAX9875
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= V
PVDD
= 3.7V, V
GND
= V
PGND
= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, SHDN = 1.
Speaker loads (Z
SPK
) connected between OUT+ and OUT-. Headphone loads (R
HP
) connected from HPL or HPR to GND. SDA and
SCL pullup voltage = 3.3V. Z
SPK
= ∞, R
HP
= ∞. C1 = C2 = C
BIAS
= 1µF. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +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 V
SS
, 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 V
SS
- 0.3V, whichever limits first.
V
DD
, PVDD to PGND .............................................-0.3V to +5.5V
V
DD
to PVDD .........................................................-0.3V to +0.3V
V
SS
to PGND .........................................................-5.5V to +0.3V
C1N to PGND..............................................(V
SS
- 0.3V) to +0.3V
C1P to PGND...........................................-0.3V to (PVDD + 0.3V)
HPL, HPR to V
SS
(Note 1)......-0.3V to the lower of (PVDD - (V
SS
+ 0.3V)) or +9V
HPL, HPR to PVDD
(Note 2) .....+0.3V to the higher of (V
SS
- (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 Input Current V
SS
...........................................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 (T
A
= +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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range V
DD
, PVDD Guaranteed by PSRR test 2.7 5.25 V
OSC = 00 5.6 9.0
HP mode,
OUTMODE = 2
OSC = 10 5.5
OSC = 00 6.6 11.0
SPK mode,
OUTMODE = 7
OSC = 10 5.7
OSC = 00 10.4 16.0
Quiescent Current I
DD
SPK + HP mode,
OUTMODE = 9
OSC = 10 9.3
mA
Shutdown Current I
SHDN
I
SHDN
= I
VDD
+ I
PVDD
; SHDN = 0; V
SDA
=
V
SCL
= logic-high; T
A
= +25°C
10 22 µA
OSC = 00 10
OSC = 01 10
Turn-On Time t
ON
Time from shutdown to
full operation
OSC = 10 17.5
ms
BIAS
Release Time t
BR
After forcing BIAS low, time from BIAS
released to I
2
C reset
25 80 ms
T
A
= +25°C, preamp gain = 0dB or +9dB 11 21 31
Input Resistance R
IN
T
A
= +25°C, preamp gain = +20dB 3 5.5 8
kΩ
Preamp = 0dB 2.30
Preamp = +9dB 0.820Maximum Input Signal Swing
Preamp = +20dB 0.230
V
P-P
MAX9875
Low RF Susceptibility, Mono Audio
Subsystem with DirectDrive Headphone Amplifier
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Preamp = 0dB 47
Preamp = +9dB 49
Common-Mode Rejection Ratio CMRR
f
IN
= 1kHz (differential
input mode)
Preamp = +20dB 42
dB
Input DC Voltage IN__ inputs 1.22 1.3 1.38 V
Bias Voltage V
BIAS
1.13 1.2 1.27 V
SPEAKER AMPLIFIER (OUTMODE = 1)
T
A
= +25°C (volume at mute) ±0.5 ±4
Output Offset Voltage V
OS
T
A
= +25°C (volume at 0dB,
OUTMODE = 1, ∆IN_ = 0)
±1.5
mV
Into shutdown -70
Click-and-Pop Level K
CP
Peak voltage, T
A
=
+25°C, A-weighted, 32
samples per second,
volume at mute (Note 4)
Out of shutdown -70
dBV
PVDD = V
DD
=
2.7V to 5.5V
50 76
f = 217Hz,
100mV
P-P
ripple
72
f = 1kHz,
100mV
P-P
ripple
68
Power-Supply Rejection Ratio
(Note 4)
PSRR
T
A
= +25°C, PVDD =
V
DD
f = 20kHz,
100mV
P-P
ripple
55
dB
Z
SPK
= 8Ω +
68µH, V
DD
= 3.7V
725
Z
SPK
= 8Ω +
68µH, V
DD
= 3.3V
560
Z
SPK
= 8Ω +
68µH, V
DD
= 3.0V
465
Z
SPK
= 4Ω +
33µH, V
DD
= 3.7V
825
Output Power (Note 5) P
OUT
THD+N ≤ 1%
Z
SPK
= 4Ω +
33µH, V
DD
= 3.0V
770
mW
Total Harmonic Distortion Plus
Noise
THD+N
f = 1kHz, P
OUT
= 350mW, T
A
= +25°C,
Z
SPK
= 8Ω + 68µH
0.05 %
∆IN_ = 0
(single-ended)
92
A-weighted,
OUTMODE = 1, 3,
4, 6
∆IN_ = 1 (differential) 94
∆IN_ = 0
(single-ended)
88
Signal-to-Noise Ratio SNR
A-weighted,
OUTMODE = 7, 9
∆IN_ = 1 (differential) 92
dB
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= V
PVDD
= 3.7V, V
GND
= V
PGND
= 0V. Single-ended inputs, preamp gain = 0dB, volume controls = 0dB, OSC = 00, SHDN = 1.
Speaker loads (Z
SPK
) connected between OUT+ and OUT-. Headphone loads (R
HP
) connected from HPL or HPR to GND. SDA and
SCL pullup voltage = 3.3V. Z
SPK
= ∞, R
HP
= ∞. C1 = C2 = C
BIAS
= 1µF. T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are
at T
A
= +25°C.) (Note 3)
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MAX9875ERP+T

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Buy MAX9875ERP+T
Manufacturer:
Maxim Integrated
Description:
Audio Amplifiers Audio Subsystem w/DirectDrive
Lifecycle:
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