19-5111; Rev 1; 7/10
TION KIT
EVALUA BLE
AVAILA
Audio Subsystem with Mono Class D
Speaker and Class H Headphone Amplifiers
General Description
Features
S
2.7V to 5.5V Speaker Supply Voltage
S
1.6V to 2V Headphone Supply Voltage
S
700mW Speaker Output (V
PVDD
= 3.7V,
Z
SPK
= 8ω + 68µH)
S
37mW/Channel Headphone Output (R
HP
= 16I)
S
Low-Emission Class D Amplifier
S
Efficient Class H Headphone Amplifier
S
Ground-Referenced Headphone Outputs
S
2 Stereo Single-Ended/Mono Differential Inputs
S
Integrated Distortion Limiter (Speaker Outputs)
S
Integrated DPST Analog Switch
S
No Clicks and Pops
S
TDMA Noise Free
S
2mm x 2.5mm, 20-Bump, 0.5mm Pitch WLP
Package
MAX97002
The MAX97002 mono audio subsystem combines a
mono speaker amplifier with a stereo headphone ampli-
fier and an analog DPST switch. The headphone and
speaker amplifiers have independent volume control and
on/off control. The 4 inputs are configurable as 2 differ-
ential inputs or 4 single-ended inputs.
The entire subsystem is designed for maximum effi-
ciency. The high-efficiency, 700mW, Class D speaker
amplifier operates directly from the battery and con-
sumes no more than 1FA in shutdown mode. The Class
H headphone amplifier utilizes a dual-mode charge
pump to maximize efficiency while outputting a ground-
referenced signal that does not require output coupling
capacitors.
The speaker amplifier incorporates a distortion limiter to
automatically reduce the volume level when excessive
clipping occurs. This allows high gain for low-level sig-
nals without compromising the quality of large signals.
All control is performed using the 2-wire I
2
C interface.
The MAX97002 operates over the extended -40NC to
+85NC temperature range, and is available in the 2mm x
2.5mm, 20-bump, WLP package (0.5mm pitch).
Ordering Information
PART
MAX97002EWP+
TEMP RANGE
-40NC to +85NC
PIN-PACKAGE
20 WLP
Applications
Cell Phones
Portable Media Players
Simplified Block Diagram
1.8V
BATTERY
I
2
C
CONTROL
POWER SUPPLY
STEREO/
MONO
INPUT
MAX97002
VOLUME
CLASS H
AMPLIFIER
CHARGE
PUMP
STEREO/
MONO
INPUT
LIMITER
VOLUME
CLASS D
AMPLIFIER
BYPASS
_______________________________________________________________
Maxim Integrated Products
1
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.
Audio Subsystem with Mono Class D
Speaker and Class H Headphone Amplifiers
MAX97002
Table of ConTenTs
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Simplified Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Functional Diagram/Typical Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Digital I/O Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
I
2
C TIMING Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Detailed Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Signal Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mixers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Class D Speaker Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Ultra-Low EMI Filterless Output Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Distortion Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Analog Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Headphone Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
DirectDrive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Charge Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Class H Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Low-Power Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
I
2
C Slave Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
I
2
C Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Mixers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Volume Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Distortion Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Charge-Pump Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
I
2
C Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Bit Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
START and STOP Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Charge-Pump Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2
Audio Subsystem with Mono Class D
Speaker and Class H Headphone Amplifiers
MAX97002
Table of ConTenTs (ConTinued)
Early STOP Conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Slave Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Write Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Read Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Applications Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Filterless Class D Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
RF Susceptibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Component Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Optional Ferrite Bead Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Input Capacitor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Charge-Pump Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Charge-Pump Flying Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Charge-Pump Holding Capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Supply Bypassing, Layout, and Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
WLP Applications Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Package Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
3
Audio Subsystem with Mono Class D
Speaker and Class H Headphone Amplifiers
MAX97002
Functional Diagram/Typical Application Circuit
1.6V TO 2V
2.7V TO 5.5V
1µF
V
DD
B4
PVDD
D4
0.1µF
10µF
MUX
0.47µF
OPTIONAL
PGAINA
-6dB TO +18dB
BIAS
INADIFF
B1 BIAS
1µF
INA1 C1
LPMODE
HPLVOL:
-64dB TO +6dB
PGAINA
-6dB TO +18dB
HPVDD
CLASS H
0/3dB
HPLEN
HPVSS
HPVDD
HPRVOL:
-64dB TO +6dB
A2 HPL
0.47µF
OPTIONAL
INA2 C2
+
HPLMIX
MIX
0.47µF
OPTIONAL
PGAINB
-6dB TO +18dB
CLASS H
0/3dB
HPREN
HPVSS
PVDD
A1 HPR
INB1 D1
INBDIFF
HPRMIX
SPKVOL:
-30dB TO +20dB
MIX
C5 OUTP
CLASS D
+12dB
SPKEN
PGND
THD LIMITER
D5 OUTN
0.47µF
OPTIONAL
PGAINB
-6dB TO +18dB
SPKMIX
INB2 D2
+
ANALOG SWITCHES
MIX
LMTEN
COM1 C3
COM2 D3
V
DD
SDA B2
SCL B3
I
2
C
INTERFACE
BYPEN
V
DD
MAX97002
C4
GND
A4
C1P
CHARGE PUMP
A5
C1N
B5
HPVDD
A3
HPVSS
4
Audio Subsystem with Mono Class D
Speaker and Class H Headphone Amplifiers
ABSOLUTE MAxIMUM RATINGS
(Voltages with respect to GND.)
V
DD
, HPVDD ........................................................-0.3V to +2.2V
PVDD ....................................................................-0.3V to +6.0V
HPVSS ..................................................................-2.2V to +0.3V
C1N ..................................... (HPVSS - 0.3V) to (HPVDD + 0.3V)
C1P ...................................................... -0.3V to (HPVDD + 0.3V)
HPL, HPR ............................ (HPVSS - 0.3V) to (HPVDD + 0.3V)
INA1, INA2, INB1, INB2, BIAS .............................-0.3V to +6.0V
SDA, SCL .............................................................-0.3V to +6.0V
COM1, COM2, OUTP, OUTN .................-0.3V to (PVDD + 0.3V)
Continuous Current In/Out of PVDD, GND, OUT_ ........
Q800mA
Continuous Current In/Out of HPR, HPL, VDD..............
Q140mA
Continuous Current In/Out of COM1, COM2 ................
Q150mA
Continuous Input Current (all other pins) ........................
Q20mA
Duration of OUT_ Short Circuit to GND or PVDD .....Continuous
Duration of Short Circuit Between
OUTP and OUTN ...................................................Continuous
Duration of HP_ Short Circuit to GND or V
DD
...........Continuous
Continuous Power Dissipation (T
A
= +70NC)
20-Bump WLP Multilayer Board
(derate 13mW/NC above +70NC)................................1040mW
Junction Temperature .....................................................+150NC
Operating Temperature Range .......................... -40NC to +85NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+260NC
MAX97002
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.
ELECTRICAL CHARACTERISTICS
(V
VDD
= 1.8V, V
PVDD
= 3.7V, V
GND
= 0V. Input signal applied at INA configured single-ended, preamp gain = 0dB, HPLVOL =
HPRVOL = SPKVOL = 0dB, speaker loads (Z
SPK
) connected between OUTP and OUTN. Headphone loads (R
HP
) connected from
HPL or HPR to GND. SDA and SCL pullup voltage = 1.8V. Z
SPK
=
J,
R
HP
=
J.
C
C1P-C1N
= C
HPVDD
= C
HPVSS
= C
BIAS
= 1FF.
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25NC.) (Note 1)
PARAMETER
Speaker Amplifier Supply
Voltage Range
Headphone Amplifier Supply
Voltage Range
SYMBOL
PVDD
V
DD
CONDITIONS
Guaranteed by PSRR test
Guaranteed by PSRR test
Low-power headphone
mode, T
A
= +25NC
HP mode, T
A
= +25NC,
stereo SE input on INA,
INB disabled
SPK mode, T
A
= +25NC
mono differential Input on
INB, INA disabled
SPK + HP mode, T
A
=
+25NC, stereo SE input on
INA, INB disabled
I
SHDN
T
A
= +25NC, V
SHDN
= 0V
I
VDD
I
PVDD
I
VDD
I
PVDD
I
VDD
I
PVDD
I
VDD
I
PVDD
I
VDD +
I
PVDD
Shutdown Current
V
VDD
= 0V,
I
PVDD
MIN
2.7
1.6
1.35
0.35
1.35
0.75
0.32
1.38
1.35
1.8
0
<1
10
41.2
16
5.5
20.6
7.2
27
9.6
kI
TYP
MAx
5.5
2
1.85
0.55
1.85
1.15
0.6
2.2
1.85
2.7
8
FA
mA
UNITS
V
V
Quiecsent Supply Current
Turn-On Time
t
ON
Time from power-on to full operation,
including soft-start
Gain = -6dB, -3dB
T
A
= +25NC,
internal gain
Gain = 0dB, 3dB,
6dB, dB
Gain = 18dB
ms
Input Resistance
R
IN
5
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