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MAX97000EWA+T
Audio Subsystem with Mono Class D Speaker and Class H Headphone Amplifier
Audio Subsystem with Mono Class D
Speaker and Class H Headphone Amplifier
General Description
The MAX97000 audio subsystem combines a mono
speaker amplifier with a stereo headphone amplifier and
an analog DPST switch. The headphone and speaker
amplifiers have independent volume control and on/off
control. The four inputs are configurable as two differen-
tial inputs or four single-ended inputs.
The entire subsystem is designed for maximum efficiency.
The high-efficiency 725mW Class D speaker amplifier
operates directly from the battery and consumes 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, I2C interface.
The MAX97000 operates in the extended -40NC to +85NC
temperature range, and is available in the 2mm x 2mm,
25-bump WLP package (0.4mm pitch).
Applications
Cell Phones
Portable Multimedia Players
Features
S 1.6V to 2.0V Headphone Supply Voltage
S 2.7V to 5.5V Speaker Supply Voltage
S Internal LDO Allows Single-Supply Operation
S 725mW Speaker Output (VPVDD = 3.7V, ZSPK = 8I
+ 68µH)
S 40mW/Channel Headphone Output (RHP = 16I)
S Low-Emission Class D Amplifier
S Efficient Class H Headphone Amplifier
S Ground-Referenced Headphone Outputs
S Two 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 2mm, 25-Bump 0.4mm Pitch WLP Package
19-5004; Rev 1; 6/10
Ordering Information
Simplified Block Diagram
+Denotes a lead(Pb)-free/RoHS-compliant package.
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-PACKAGE
MAX97000EWA+-40NC to +85NC25 WLP
STEREO/
MONO
INPUT
STEREO/
MONO
INPUT
VOLUMECLASS D
AMPLIFIER
CLASS H
AMPLIFIER
CHARGE
PUMP
VOLUME
POWER SUPPLY
1.8V
BATTERY
2.7V TO 5.5V
CONTROL
I2C
SWITCH
LIMITER
MAX97000
Audio Subsystem with Mono Class D Speaker
and Class H Headphone Amplifier
MAX97000
TABLE OF CONTENTS
General Description ............................................................................1
Applications ..................................................................................1
Features .....................................................................................1
Simplified Block Diagram........................................................................1
Ordering Information ...........................................................................1
Table of Contents..............................................................................2
Functional Diagram/Typical Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Absolute Maximum Ratings ......................................................................5
Electrical Characteristics ........................................................................5
Digital I/O Characteristics........................................................................9
I2C Timing Characteristics .......................................................................9
Typical Operating Characteristics ................................................................10
Pin Configuration .............................................................................17
Pin Description...............................................................................17
Detailed Description...........................................................................18
Signal Path ................................................................................18
Mixers ....................................................................................19
Class D Speaker Amplifier ....................................................................19
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
I2C Slave Address...........................................................................22
I2C Registers...............................................................................23
Audio Subsystem with Mono Class D Speaker
and Class H Headphone Amplifier
MAX97000
TABLE OF CONTENTS (CONTINUED)
Mixers ....................................................................................24
Volume Control .............................................................................25
Distortion Limiter............................................................................27
Power Management .........................................................................27
Charge-Pump Control........................................................................28
I2C Serial Interface ..........................................................................28
Bit Transfer..............................................................................28
START and STOP Conditions................................................................28
Early STOP Conditions.....................................................................28
Slave Address ...........................................................................28
Acknowledge............................................................................29
Write Data Format ........................................................................29
Read Data Format ........................................................................30
Applications Information........................................................................31
Filterless Class D Operation ...................................................................31
RF Susceptibility ............................................................................31
Component Selection ........................................................................31
Optional Ferrite Bead Filter .................................................................31
Input Capacitor...........................................................................31
Charge-Pump Capacitor Selection ...........................................................32
Charge-Pump Flying Capacitor..............................................................32
Charge-Pump Holding Capacitor ............................................................32
Supply Bypassing, Layout, and Grounding.....................................................32
WLP Applications Information ...............................................................32
Package Information...........................................................................33
Revision History ..............................................................................34
Audio Subsystem with Mono Class D
Speaker and Class H Headphone Amplifier
MAX97000
Functional Diagram/Typical Application Circuit
M U X
LPMODE
M I X
HPLMIX
M I X
HPRMIX
M I X
SPKMIX
10µF
PGAINA
-6dB TO +18dB
PGAINA
-6dB TO +18dB
PGAINB
-6dB TO +18dB
PGAINB
-6dB TO +18dB
HPLVOL:
-64dB TO +6dB
HPRVOL:
-64dB TO +6dB
SPKVOL:
-30dB TO +20dB
INADIFF
INBDIFF
0.47µFINA1
OPTIONAL
0.47µF
INA2
OPTIONAL
0.47µFINB1D4
OPTIONAL
0.47µFINB2D5
COM1D2
COM2D3
SDAB3
GND
VDD
CHARGE PUMP
1µF
1µF1µF
C1P
C1N
HPVDDHPVSS
PGND
VDDSWEN
ANALOG SWITCHES
THD LIMITER
THDCLP
SCLB4I2C
INTERFACE/
SHUTDOWNC4
OPTIONAL
1µF1µF1µF10µF
PVDD
BIASBIAS
HPVDD
HPVSS
HPVDD
HPVSS
PVDD
HPREN
HPLEN
1µF
HPLB5
HPRA5
OUTP
CLASS D
+12dB
OUTN
SPKEN
PGND
NC1E2
NC2E3
LDOIN
LDO
VDD
2.5V TO 5.5V
OPTIONAL
1.6V TO 2.0V2.7V TO 5.5V
SHDNMAX97000
CLASS H
0/3dB
CLASS H
0/3dB
Audio Subsystem with Mono Class D
Speaker and Class H Headphone Amplifier
MAX97000
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.
(Voltages with respect to GND.)
VDD, HPVDD ........................................................-0.3V to +2.2V
PVDD, LDOIN .......................................................-0.3V to +6.0V
PGND ...................................................................-0.1V to +0.1V
HPVSS .................................................................-2.2V to + 0.3V
C1N .....................................(HPVSS - 0.3V) to (HPVDD + 0.3V)
C1P ..........................................................- 0.3V to (VDD + 0.3V)
HPL, HPR .............................(HPVSS - 0.3V) to (HPVDD +0.3V)
INA1, INA2, INB1, INB2, BIAS .............................-0.3V to +6.0V
SDA, SCL, SHDN .................................................-0.3V to +6.0V
COM1, COM2, NC1, NC2,
OUTP, OUTN ......................................-0.3V to (PVDD + 0.3V)
Continuous Current In/Out of PVDD, PGND, OUT_ ......Q800mA
Continuous Current In/Out of HPR, HPL,
VDD, LDOIN ..............................................................Q140mA
Continuous Current In/Out of COM1,
COM2, NC1, NC2 ......................................................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 VDD ..........Continuous
Continuous Power Dissipation (TA = +70NC) Multilayer Board
25 WLP (derate 19.2mW/NC above +70NC) ................850mW
Junction Temperature .....................................................+150NC
Operating Temperature Range ..........................-40NC to +85NC
Storage Temperature Range ............................-65NC to +150NC
Soldering Temperature (reflows) .....................................+260NC
ELECTRICAL CHARACTERISTICS
(VLDOIN = VPVDD = V SHDN = 3.7V, VGND = VPGND = 0V. Input signal applied at INA configured single-ended, preamp gain = 0dB,
HPLVOL = HPRVOL = SPKVOL = 0dB, speaker loads (ZSPK) connected between OUTP and OUTN. Headphone loads (RHP) con-
nected from HPL or HPR to GND. SDA and SCL pullup voltage = 1.8V. ZSPK = J, RHP = J. CC1P-C1N = CHPVDD = CHPVSS = CBIAS
= 1FF. TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)
ABSOLUTE MAXIMUM RATINGS
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Speaker Amplifier Supply-
Voltage RangeVPVDDGuaranteed by PSRR test2.75.5V
Headphone Amplifier Supply
Voltage RangeVDDGuaranteed by PSRR test1.62V
LDO Input Supply-Voltage RangeVLDOINGuaranteed by PSRR test2.55.5V
Quiescent Supply Current
Low-power mode, TA = +25NC,
LPMODE = 0x01
ILDOIN1.452
IPVDD0.40.7
HP mode, TA = +25NC, stereo SE
input on INA, INB disabled
ILDOIN1.452
IPVDD0.791.2
SPK mode, TA = +25NC mono
differential input on INB, INA disabled
ILDOIN0.420.75
IPVDD1.382.2
SPK + HP mode, TA = +25NC stereo
SE input on INA, INB disabled
ILDOIN1.452
IPVDD1.82.7
Shutdown CurrentISHDN
TA = +25NC, internal gain, softwareIPVDD90175ILDOIN60110
TA = +25NC, internal gain, IPVDD + ILDOIN,
hardware1
Turn-On TimetONTime from power-on to full operation
including soft-start8ms
Input ResistanceRINTA = +25NC,
internal gain
Gain = -6dB, -3dB41.2Gain = 0dB to +9dB1620.627
Gain = +18dB5.57.29.5
