19-3732; Rev 2; 7/07
IT
TION K
VALUA
E
BLE
AVAILA
Stereo Audio CODECs with Microphone, DirectDrive
Headphones, Speaker Amplifiers, or Line Outputs
MAX9851/MAX9853
General Description
The MAX9851/MAX9853 are single-chip, stereo audio
CODECs designed to provide a complete audio solu-
tion for a GSM/GPRS/EDGE cell phone. The MAX9851/
MAX9853 provide stereo DirectDrive
TM
headphone
amplifiers, a mono receiver speaker amplifier, stereo
Class D speaker amplifiers (MAX9851 only), stereo dif-
ferential line outputs (MAX9853 only), microphone input
amplifiers, plus flexible input selection and gain control.
Two serial digital audio interfaces are included, one
intended to accept voiceband data and the other
accepting I
2
S data. The voiceband interface can be
reconfigured as needed to act as a secondary I
2
S feed
input—allowing multiple audio source mixing of ringer
tones or other audio at different sample rates. A trans-
ducer/vibrator signal can be derived from digital audio.
The stereo digital-to-analog converter (DAC) path
includes filtering and mixing, programmable-gain ampli-
fiers (PGA), soft muting, and optional voiceband digital
filtering. The MAX9851/MAX9853 accept up to two digital
audio inputs at different sample rates. All analog inputs
have PGAs on the front end, allowing dynamic range
optimization with a wide range of input sources.
The stereo analog-to-digital converter (ADC) converts
audio signals from either internal or external microphones
or stereo line inputs. The microphone amplifiers have a
programmable gain from 0 to 40dB to handle both ampli-
fied microphones and electret modules. In addition to a
digital highpass filter to remove DC offset voltages, the
ADC also features voiceband digital filtering.
The digital audio interfaces support a variety of serial
audio formats. The secondary serial audio interface has
an independent supply voltage to allow integration into
multiple supply systems. Control for volume levels, sig-
nal mixing, and operating modes is done through the
I
2
C 2-wire interface.
All circuitry is optimized for high PSRR. The MAX9851/
MAX9853 use a thermally efficient, space-saving 48-pin
thin QFN package (7mm x 7mm x 0.8mm) with an
exposed pad.
Features
♦
+1.7V to +3.3V (Digital) and +2.6V to +3.3V
(Analog) Operation
♦
+2.6V to +5.5V Class D Speaker Amplifier
Operation (Direct from Battery)
♦
Low 26mW Quiescent Power Consumption
(Playback)
♦
High 98dB Power-Supply Rejection Ratio
♦
8kHz to 48kHz Sample Rate (Replay and Record)
♦
Stereo 18-Bit ADC and DAC
♦
Low-Noise Stereo Microphone Inputs and Stereo
Line Inputs
♦
Dual Source Digital Mixing (DAC)
♦
Selectable Voiceband Filter for
Recording/Playback Modes
♦
Digital Filtering, Soft Mute, and Volume Control
♦
Low-Noise, High-PSRR Microphone Bias
Generator
♦
Stereo DirectDrive Headphone Amplifier
(2 x 50mW)
♦
Mono DirectDrive Handset Receiver Amplifier
(1 x 105mW)
♦
Stereo Class D, Ultra-Low-EMI, Filterless Speaker
Amplifier with Active Emissions Limiting
(2 x 1.25W, 8Ω) (MAX9851)
♦
Stereo Differential Line Output Amplifiers
(MAX9853)
♦
Clickless/Popless Operation
♦
Flexible Shutdown Modes for Power Saving
♦
Comprehensive Headset Detection
♦
Ultra-Low Power Wake-Up on Headset Detection
Ordering Information
PART
MAX9851ETM+
MAX9853ETM+
PIN-PACKAGE
48 TQFN-EP*
(7mm x 7mm x 0.8mm)
48 TQFN-EP*
(7mm x 7mm x 0.8mm)
PKG CODE
T4877-6
T4877-6
Applications
GSM/GPRS/EDGE Cell Phones
PDAs/SmartPhones
Note:
All devices specified over the -40°C to +85°C temperature
range.
+Denotes
lead-free package.
*EP
= Exposed pad.
Pin Configurations and Selector Guide appear at end of data
sheet.
________________________________________________________________
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.
Stereo Audio CODECs with Microphone, DirectDrive
Headphones, Speaker Amplifiers, or Line Outputs
MAX9851/MAX9853
Simplified Block Diagrams
DV
DD
AND DV
DDS2
1.7V TO 3.3V
AV
DD
AND CPV
DD
2.6V TO 3.3V
PV
DD
2.6V TO 5.5V
MAX9851
SDOUTS1
SDINS1
BCLKS1
LRCLKS1
DAC
DIGITAL
INTERFACE 1
DIGITAL
FILTERING
AND
MIXERS
DIGITAL
INTERFACE 2
ADC
ADC
RIGHT
SPEAKER
INTERNAL MICROPHONE
SDA
SCL
I
2
C
VIBRATOR
CONTROLLER
MONO
RECEIVER
SPEAKER
ANALOG
MIXERS
LEFT
SPEAKER
DAC
SDOUTS2
SDINS2
BCLKS2
LRCLKS2
LEFT EXT MICROPHONE
RIGHT EXT MICROPHONE
LINEIN
INTERNAL TRANSDUCER/VIBRATOR
LINEIN
DV
DD
AND DV
DDS2
1.7V TO 3.3V
AV
DD
AND CPV
DD
2.6V TO 3.3V
MAX9853
SDOUTS1
SDINS1
BCLKS1
LRCLKS1
DAC
DIGITAL
INTERFACE 1
DIGITAL
FILTERING
AND
MIXERS
DIGITAL
INTERFACE 2
ADC
ADC
RIGHT LINE
OUT
INTERNAL MICROPHONE
SDA
SCL
I
2
C
VIBRATOR
CONTROLLER
MONO
RECEIVER
SPEAKER
ANALOG
MIXERS
LEFT LINE
OUT
DAC
SDOUTS2
SDINS2
BCLKS2
LRCLKS2
LEFT EXT MICROPHONE
RIGHT EXT MICROPHONE
LINEIN
INTERNAL TRANSDUCER/VIBRATOR
LINEIN
2
_______________________________________________________________________________________
Stereo Audio CODECs with Microphone, DirectDrive
Headphones, Speaker Amplifiers, or Line Outputs
ABSOLUTE MAXIMUM RATINGS
(Voltages with respect to AGND)
AV
DD
, DV
DD
, DV
DDS2
, CPV
DD
.................................-0.3V to +4V
PV
SS
, SV
SS
...............................................................-4V to +0.3V
PV
DD
.........................................................................-0.3V to +6V
AGND, DGND, CPGND, PGND.............................-0.3V to +0.3V
HPL, HPR, REC ...........................(SV
SS
- 0.3V) to (AV
DD
+ 0.3V)
LSPK+, LSPK-, RSPK+, RSPK- ................-0.3V to (PV
DD
+ 0.3V)
LINEIN1, LINEIN2........................................................-2V to +2V
EXTMICBIASL, EXTMICBIASR.................-0.3V to (AV
DD
+ 0.3V)
INTMICP, INTMICN, EXTMICL, EXTMICR ...................-2V to +2V
EXTMICGND..........................................................-0.3V to +0.3V
C1N..........................................(PV
SS
- 0.3V) to (CPGND + 0.3V)
C1P.......................................(CPGND - 0.3V) to (CPV
DD
+ 0.3V)
PREG, REF, MBIAS, INTMICBIAS............-0.3V to (AV
DD
+ 0.3V)
NREG ........................................................+0.3V to (SV
SS
- 0.3V)
OUTL+, OUTL-, OUTR+, OUTR-,
FAULTIN................................................-0.3V to (AV
CC
+ 0.3V)
MCLK,
IRQ, VIBE,
SCL, SDA....................................-0.3V to +4V
SHDNOUT ................................................................-0.3V to +6V
LRCLKS1, BCLKS1, SDOUTS1,
SDINS1....................................................-0.3V to DV
DD
+ 0.3V
LRCLKS2, BCLKS2, SDOUTS2,
SDINS2 ................................................-0.3V to DV
DDS2
+ 0.3V
Short Circuit to AGND Duration:
HPL, HPR, REC .......................................................Continuous
LSPK+, LSPK-, RSPK+,
RSPK- ..........Subject to Maximum Package Power Dissipation
INTMICBIAS, EXTMICBIASL, EXTMICBIASR.............Continuous
Short Circuit to AV
DD
Duration
EXTMICBIASL, EXTMICBIASR ................................Continuous
Current Into/Out of Any Pin (unless otherwise noted).......100mA
Continuous Power Dissipation (T
A
= +70°C)
48-Pin Thin QFN (derate 40mW/°C above +70°C) .....3200mW
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
MAX9851/MAX9853
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
(AV
DD
= CPV
DD
= +3V, DV
DD
= DV
DDS2
= +1.8V, PV
DD
= +3.3V, R
HP
= 32Ω, Z
SPK
= 8Ω + 10µH, R
REC
= 32Ω, R
OUTL+
to R
OUTL-
=
10kΩ, R
OUTR+
to R
OUTR-
= 10kΩ, C1 = 0.22µF, C2 = C
NREG
= C
PREG
= C
INTMICBIAS
, C
MBIAS
= C
REF
= 1µF, MCLK = 13MHz, all
PGAs = 0dB, HP/REC volume = -20.0dB, SPK volume = -20.4dB, line output gain = -0.4dB, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (See
Functional Diagrams/Typical Operating Circuits).
PARAMETER
Analog Supply Voltage
Digital Supply Voltage
Speaker Supply Voltage
SYMBOL
AV
DD
,
CPV
DD
DV
DD
,
DV
DDS2
PV
DD
CONDITIONS
AV
DD
= CPV
DD
, no load
No load
No load
Stereo headphone
DAC playback
mode, no output
loads
(Note 1)
Stereo speaker
(MAX9851)/line output
(MAX9853)
Mono receiver
Stereo headphone
Analog Supply Current
AI
DD
Line only playback
mode, no output
loads
Stereo speaker
(MAX9851)/line output
(MAX9853)
Mono receiver
Stereo headphone
DAC plus line
input playback
mode, no output
loads (Note 1)
Stereo speaker
(MAX9851)/line output
(MAX9853)
Mono receiver
MIN
2.6
1.7
2.6
7.2
6.5
6.4
5.0
4.6
4.4
7.2
6.4
6.3
mA
8.5
TYP
MAX
3.3
3.3
5.5
UNITS
V
V
V
_______________________________________________________________________________________
3
Stereo Audio CODECs with Microphone, DirectDrive
Headphones, Speaker Amplifiers, or Line Outputs
MAX9851/MAX9853
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= CPV
DD
= +3V, DV
DD
= DV
DDS2
= +1.8V, PV
DD
= +3.3V, R
HP
= 32Ω, Z
SPK
= 8Ω + 10µH, R
REC
= 32Ω, R
OUTL+
to R
OUTL-
=
10kΩ, R
OUTR+
to R
OUTR-
= 10kΩ, C1 = 0.22µF, C2 = C
NREG
= C
PREG
= C
INTMICBIAS
, C
MBIAS
= C
REF
= 1µF, MCLK = 13MHz, all
PGAs = 0dB, HP/REC volume = -20.0dB, SPK volume = -20.4dB, line output gain = -0.4dB, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (See
Functional Diagrams/Typical Operating Circuits).
PARAMETER
SYMBOL
CONDITIONS
Stereo headphone
Full-duplex voice
mode, no output
loads
Stereo speaker
(MAX9851)/line output
(MAX9853)
Mono receiver
Analog Supply Current
AI
DD
Full-duplex voice
mode plus DAC
playback mode,
no output loads
(Notes 1, 2)
Stereo headphone
Stereo speaker
(MAX9851)/line output
(MAX9853)
Mono receiver
MIN
TYP
11.9
11.2
11.1
11.9
mA
11.2
11.1
12.2
18.2
5
10
2
2.7
6.2
3.9
1.4
0.5
1
0.1
70
14
15
3.7
7.8
5.2
20
10
20
5
µA
µA
µA
ms
mA
24.0
mA
µA
14.5
MAX
UNITS
ADC record mode (Note 3)
ADC record mode plus DAC headphone
playback mode (Notes 1, 3)
Mono Class D speaker mode
Speaker Supply Current (Note 4)
PI
DD
Stereo Class D speaker mode
Sleep mode (MAX9851, MAX9853)
Playback operation (Note 1), no output
loads
Digital Supply Current
DI
DD
Full duplex voice operation (Note 2), no
output loads, T
A
= +25°C
Record operation (Notes 1, 3)
Analog Shutdown Current
Digital Shutdown Current
PV
DD
Shutdown Current
(Note 4)
Shutdown to Full Operation
AI
SHDN
DI
SHDN
PI
SHDN
t
ON
I
AVDD
+ I
CPVDD
, T
A
= +25°C
I
DVDD
+ I
DVDDS2
, T
A
= +25°C
I
PVDD
, T
A
= +25°C
MAX9851
MAX9853
ADC and DAC fully operational, master
mode
DAC PERFORMANCE (Note 5) (DAC in Master Mode)
Gain Error
Channel Gain Matching
f
S
= 8kHz (voice modes), headphone
volume = +5.5dB
Dynamic Range (Note 6)
DR
f
S
= 8kHz and 48kHz (stereo audio modes),
headphone volume = +5.5dB
84
87.5
±1
±1
75.5
dB
±7
%
%
4
_______________________________________________________________________________________
Stereo Audio CODECs with Microphone, DirectDrive
Headphones, Speaker Amplifiers, or Line Outputs
ELECTRICAL CHARACTERISTICS (continued)
(AV
DD
= CPV
DD
= +3V, DV
DD
= DV
DDS2
= +1.8V, PV
DD
= +3.3V, R
HP
= 32Ω, Z
SPK
= 8Ω + 10µH, R
REC
= 32Ω, R
OUTL+
to R
OUTL-
=
10kΩ, R
OUTR+
to R
OUTR-
= 10kΩ, C1 = 0.22µF, C2 = C
NREG
= C
PREG
= C
INTMICBIAS
, C
MBIAS
= C
REF
= 1µF, MCLK = 13MHz, all
PGAs = 0dB, HP/REC volume = -20.0dB, SPK volume = -20.4dB, line output gain = -0.4dB, T
A
= T
MIN
to T
MAX
, unless otherwise
noted. Typical values are at T
A
= +25°C.) (See
Functional Diagrams/Typical Operating Circuits).
PARAMETER
SYMBOL
CONDITIONS
f
IN
= 1kHz, f
S
= 8kHz, 0dBFS (voice mode
master mode, ADC and headphone output
enabled, no load), headphone volume =
+2.5dB
f
IN
= 1kHz, f
S
= 48kHz, 0dBFS (ADC and
headphone output enabled, no load),
headphone volume = +2.5dB
f
IN
= 1kHz, f
S
= 8kHz and 16kHz (voice
modes), headphone volume = +2.5dB
Signal-to-Noise Ratio (Note 7)
SNR
f
IN
= 1kHz, f
S
= 8kHz to 48kHz (stereo audio
modes), headphone volume = +2.5dB
Crosstalk
Power-Supply Rejection Ratio
DAC DIGITAL FILTERS
Passband Cutoff
Passband Ripple
Stopband Cutoff
Stopband Attenuation
Attenuation at f
S
/ 2
DAC VOICEBAND HIGHPASS FILTER (S1 Mono Voice Input Path, f
S
= 8kHz, Register 0x07 bit 4 = 1)
Passband Cutoff
Passband -3dB Cutoff
Passband Ripple
Stopband Cutoff
Stopband Attenuation
Passband Cutoff
Passband -3dB Cutoff
Passband Ripple
Stopband Cutoff
Stopband Attenuation
Passband Cutoff
Passband Ripple
Stopband Cutoff
Stopband Attenuation
f
SL
f > f
SL
75
f
PL
f < f
PL
f
SH
f < f
SH
f
PH
f
P3_H
f > f
PH
154
28
3500
±0.05
3900
f
SH
f < f
SH
f
PH
f
P3_H
f > f
PH
77
28
350
260
±0.2
175
130
±0.2
Hz
Hz
dB
Hz
dB
Hz
Hz
dB
Hz
dB
Hz
dB
Hz
dB
f
SD
f > f
SD
60
-6.02
f
PD
f < f
PD
0.44
±0.2
0.58
f
S
dB
f
S
dB
dB
XTALK
PSRR
Driven channel at -1dBFS, f
IN
= 1kHz,
f
S
= 8kHz, headphone output (no load)
f = 217Hz, V
RIPPLE
= 100mV
P-P
f = 10kHz, V
RIPPLE
= 100mV
P-P
88
-95
95
68
dB
dB
MIN
TYP
MAX
UNITS
MAX9851/MAX9853
-71.5
dB
-84.5
Total Harmonic Distortion Plus
Noise
THD+N
75.5
dB
DAC VOICEBAND HIGHPASS FILTER (S1 Mono Voice Input Path, f
S
= 16kHz, Register 0x07, bit 4 = 1)
DAC VOICEBAND LOWPASS FILTER (S1 Mono Voice Input Path, f
S
= 8kHz)
_______________________________________________________________________________________
5
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