19-4573; Rev 2; 6/10
Ultra-Low Power Stereo Audio Codec
General Description
The MAX9867 is an ultra-low power stereo audio codec
designed for portable consumer devices such as
mobile phones and portable gaming consoles.
The device features stereo differential microphone inputs
that can be connected to either analog or digital micro-
phones. The single-ended line inputs, with configurable
preamplifier, can be sent to the ADC for record or routed
directly to the headphone amplifier for playback. An aux-
iliary ADC path can be used to track any DC voltage.
The stereo headphone amplifiers support differential,
single-ended, and capacitorless output configurations.
Using the capacitorless output configuration, the
device can output 10mW into 32Ω headphones.
Comprehensive click-and-pop circuitry suppresses
audible clicks and pops during volume changes and
startup or shutdown.
Utilizing Maxim’s proprietary digital circuitry, the device
can accept any available 10MHz to 60MHz system
clock. This architecture eliminates the need for an
external PLL and multiple crystal oscillators. The stereo
ADC and DAC paths provide user-configurable voice-
band or audioband digital filters. Voiceband filters pro-
vide extra attenuation at the GSM packet frequency
and greater than 70dB stopband attenuation at f
S
/2.
The MAX9867 operates from a single 1.8V supply, and
supports a 1.65V to 3.6V logic level. An I
2
C 2-wire seri-
al interface provides control for volume levels, signal
mixing, and general operating modes.
The MAX9867 is available in a tiny 2.2mm x 2.7mm,
0.4mm-ball-pitch, WLP package. A 32-pin 5mm x 5mm
TQFN package is also available.
o
o
o
o
Features
1.8V Single-Supply Operation
6.7mW Playback Power Consumption
90dB Stereo DAC, 8kHz
≤
f
S
≤
48kHz
85dB Stereo ADC, 8kHz
≤
f
S
≤
48kHz
MAX9867
o
Battery-Measurement Auxiliary ADC
o
Support for Any Master Clock Between 10MHz to
60MHz
o
Stereo Digital Microphone Input Support
o
Stereo Analog Differential Microphone Inputs
o
Stereo Headphone Amplifiers: Differential,
Single-Ended, or Capacitorless
o
Stereo Line Inputs
o
Voiceband Filter with a Stopband Attenuation
Greater than 70dB
o
1.65V to 3.6V Digital Interface Supply Voltage
o
I
2
S/TDM-Compatible Digital Audio Bus
o
30-Bump, 2.2mm x 2.7mm 0.4mm-Pitch WLP
Applications
Cell Phones
Portable Gaming Devices
Portable Navigation Devices
Portable Multimedia Players
Wireless Headsets
Ordering Information
PART
MAX9867EWV+
MAX9867ETJ+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
30 WLP
32 TQFN-EP*
+Denotes
lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Simplified Block Diagram
I
2
S/PCM
I
2
C
LEFT MIC AMP
DIGITAL AUDIO INTERFACE
CONTROL
INTERFACE
DIGITAL MICROPHONE
INTERFACE
MAX9867
MIX
ADC
AUDIO DIGITAL
FILTERS
ADC
DAC
MIX
DAC
HEADPHONE
AMP
RIGHT MIC AMP
LEFT PREAMP
LINEIN 1
RIGHT PREAMP
LINEIN 2
HEADPHONE
AMP
________________________________________________________________
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.
Ultra-Low Power Stereo Audio Codec
MAX9867
ABSOLUTE MAXIMUM RATINGS
(Voltages with respect to AGND.)
DVDD, AVDD, and PVDD .........................................-0.3V to +2V
DVDDIO.................................................................-0.3V to +3.6V
DGND and PGND..................................................-0.1V to +0.1V
PREG, REF, REG, MICBIAS ....................-0.3V to (AVDD + 0.3V)
MCLK, LRCLK, BCLK
SDOUT, SDIN .................................-0.3V to (DVDDIO + 0.3V)
SDA, SCL,
IRQ
......................................................-0.3V to +3.6V
LOUTP, LOUTN, ROUTP,
ROUTN .................................(PGND - 0.3V) to (PVDD + 0.3V)
LINL, LINR, JACKSNS/AUX, MICLP/DIGMICDATA,
MICLN/DIGMICCLK, MICRP, MICRN..-0.3V to (AVDD + 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
30-Bump WLP (derate 12.5mW/°C above +70°C) ....1000mW
32-Pin TQFN-EP (derate 34.5mW/°C above +70°C) .2759mW
Junction-to-Ambient Thermal Resistance (θ
JA
) (Note 1)
30-Bump WLP .............................................................80°C/W
32-Pin TQFN-EP ..........................................................29°C/W
Operating Temp Range .......................................-40°C to +85°C
Storage Temp Range ........................................-65°C to +150°C
Lead Temperature (TQFN only, 10s) ...............................+300°C
Soldering Temperature (reflow) .......................................+260°C
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
www.maxim-ic.com/thermal-tutorial.
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
AVDD
= V
PVDD
= V
DVDD
= V
DVDDIO
= +1.8V, R
L
=
∞,
headphone load (R
L
) connected between _OUTP and _OUTN in differential
mode, C
REF
= 2.2µF, C
MICBIAS
= C
PREG
= C
REG
= 1µF, AV
PRE
= +20dB, AV
PGAM
= 0dB, AV
DAC
= 0dB, AV
LINE
= +20dB, AV
VOL
=
0dB, MCLK = 13MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
Supply Voltage Range
SYMBOL
DVDDIO
Full-duplex 8kHz
mono (voice mode)
(Note 3)
Analog (AVDD +
PVDD)
Digital (DVDD +
DVDDIO)
Analog (AVDD +
PVDD)
Digital (DVDD +
DVDDIO)
Analog (AVDD +
PVDD)
Digital (DVDD +
DVDDIO)
Analog (AVDD +
PVDD)
Stereo line-in only
Digital (DVDD +
DVDDIO)
Analog (AVDD +
PVDD)
Shutdown Supply Current
T
A
= +25°C
Digital (DVDD +
DVDDIO)
0.004
1
1
0.05
5
µA
5
CONDITIONS
PVDD, DVDD, AVDD
MIN
1.65
1.65
TYP
1.8
1.8
4.65
0.96
3.28
1.40
8.0
2.0
3.8
MAX
1.95
3.6
7
1.5
5
2
mA
12
3
6
UNITS
V
DAC playback 48kHz
stereo (audio mode)
(Note 3)
Total Supply Current
I
VDD
Full-duplex 48kHz
stereo (audio mode)
(Note 3)
2
_______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
PVDD
= V
DVDD
= V
DVDDIO
= +1.8V, R
L
=
∞,
headphone load (R
L
) connected between _OUTP and _OUTN in differential
mode, C
REF
= 2.2µF, C
MICBIAS
= C
PREG
= C
REG
= 1µF, AV
PRE
= +20dB, AV
PGAM
= 0dB, AV
DAC
= 0dB, AV
LINE
= +20dB, AV
VOL
=
0dB, MCLK = 13MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
Shutdown to Full Operation
Soft-Start/-Stop Time
DAC (Note 4)
Dynamic Range (Note 5)
DR
f
S
= 48kHz, AV
VOL
=
0dB, T
A
= +25°C
Master or slave
mode
Slave mode
Differential mode
Full-Scale Output
V
OLL
/V
OLR
= 0x09
Capacitorless and
single-ended modes
84
1
0.56
1
1.2
ms
f
S
= 16kHz
0.59
-80
-15
0
60
78
78
75
62
dB
0
+18
dB
dB
dB
5
V
RMS
90
dB
SYMBOL
CONDITIONS
Excludes PLL lock time
MIN
TYP
10
10
MAX
UNITS
ms
ms
MAX9867
Gain Error
DC accuracy, measured with respect to
full-scale output
P
DLY
f = 1kHz, 0dBFS, HP
filter disabled, digital
input to analog output
f
S
= 8kHz
%
Voice Path Phase Delay
Total Harmonic Distortion
DAC Attenuation Range
DAC Gain Adjust
THD
AV
DAC
AV
GAIN
MCLK = 12.288MHz, f
S
= 48kHz, 0dBFS,
measured at headphone outputs
DACA = 0xF to 0x0
DACG = 00 to 11
V
AVDD
= V
PVDD
= 1.65V to 1.95V
f = 217Hz, V
RIPPLE
= 100mV
P-P
,
AV
VOL
= 0dB
Power-Supply Rejection Ratio
PSRR
f = 1kHz, V
RIPPLE
= 100mV
P-P
,
AV
VOL
= 0dB
f = 10kHz, V
RIPPLE
= 100mV
P-P
,
AV
VOL
= 0dB
DAC VOICE MODE DIGITAL IIR LOWPASS FILTER
With respect to f
S
within ripple; f
S
= 8kHz to
48kHz
Passband Cutoff
f
PLP
-3dB cutoff
Passband Ripple
Stopband Cutoff
Stopband Attenuation
f
SLP
f < f
PLP
With respect to f
S
; f
S
= 8kHz to 48kHz
f > f
SLP
, f = 20Hz to 20kHz
75
0.448 x
f
S
0.451 x
f
S
±0.1
0.476 x
f
S
dB
Hz
dB
Hz
_______________________________________________________________________________________
3
Ultra-Low Power Stereo Audio Codec
MAX9867
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
PVDD
= V
DVDD
= V
DVDDIO
= +1.8V, R
L
=
∞,
headphone load (R
L
) connected between _OUTP and _OUTN in differential
mode, C
REF
= 2.2µF, C
MICBIAS
= C
PREG
= C
REG
= 1µF, AV
PRE
= +20dB, AV
PGAM
= 0dB, AV
DAC
= 0dB, AV
LINE
= +20dB, AV
VOL
=
0dB, MCLK = 13MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DAC VOICE MODE DIGITAL 5th ORDER IIR HIGHPASS FILTER
DVFLT = 0x1
(elliptical tuned for 16kHz GSM + 217Hz
notch)
DVFLT = 0x2
(500Hz Butterworth tuned for 16kHz)
5th Order Passband Cutoff
(-3dB from Peak, I
2
C Register
Programmable)
f
DHPPB
DVFLT = 0x3
(elliptical tuned for 8kHz GSM + 217Hz
notch)
DVFLT = 0x4
(500Hz Butterworth tuned for 8kHz)
DVFLT = 0x5
(f
S
/240 Butterworth)
DVFLT = 0x1
(elliptical tuned for 16kHz GSM + 217Hz
notch)
DVFLT = 0x2
(500Hz Butterworth tuned for 16kHz)
5th Order Stopband Cutoff
(-30dB from Peak, I
2
C Register
Programmable)
f
DHPSB
DVFLT = 0x3
(elliptical tuned for 8kHz GSM + 217Hz
notch)
DVFLT = 0x4
(500Hz Butterworth tuned for 8kHz)
DVFLT = 0x5
(f
S
/240 Butterworth)
DC Attenuation
DC
ATTEN
DVFLT
≠
000
With respect to f
S
within ripple;
f
S
= 8kHz to 48kHz
Passband Cutoff
f
PLP
-3dB cutoff
-6.02dB cutoff
Passband Ripple
Stopband Cutoff
Stopband Attenuation
f
SLP
f < f
PLP
With respect to f
S
; f
S
= 8kHz to 48kHz
60
DAC STEREO AUDIO MODE DIGITAL FIR LOWPASS FILTER
0.43 x
f
S
0.47 x
f
S
0.50 x
f
S
±0.1
0.58 x
f
S
dB
Hz
dB
Hz
0.0161
x f
S
0.0312
x f
S
0.0321
x f
S
0.0625
x f
S
0.0042
x f
S
0.0139
x f
S
0.0156
x f
S
0.0279
x f
S
0.0312
x f
S
0.0021
x f
S
90
dB
Hz
Hz
4
_______________________________________________________________________________________
Ultra-Low Power Stereo Audio Codec
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
PVDD
= V
DVDD
= V
DVDDIO
= +1.8V, R
L
=
∞,
headphone load (R
L
) connected between _OUTP and _OUTN in differential
mode, C
REF
= 2.2µF, C
MICBIAS
= C
PREG
= C
REG
= 1µF, AV
PRE
= +20dB, AV
PGAM
= 0dB, AV
DAC
= 0dB, AV
LINE
= +20dB, AV
VOL
=
0dB, MCLK = 13MHz, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
Passband Cutoff
(-3dB from Peak)
DC Attenuation
ADC (Note 6)
Dynamic Range (Note 5)
Full-Scale Input
Gain Error (Note 7)
DR
f
S
= 8kHz, MODE = 0 (IIR voice)
f
S
= 8kHz to 48kHz, MODE = 1 (FIR audio)
Differential MIC input or stereo-line inputs,
AV
PRE
= 0dB, AV
PGAM
= 0dB
DC accuracy, measured with respect to
80% of full-scale output
f = 1kHz, 0dBFS, HP
filter disabled,
analog input to
digital output
f
S
= 8kHz
f
S
= 16kHz
75
84
85
1
1
1.2
ms
0.61
-81
-12
60
85
85
dB
80
80
-70
+3
dB
dB
5
dB
V
P-P
%
SYMBOL
CONDITIONS
MIN
TYP
0.000625
x f
S
90
MAX
UNITS
MAX9867
DAC STEREO AUDIO MODE DIGITAL DC BLOCKING HIGHPASS FILTER
f
DHPPB
DC
ATTEN
DVFLT = 0x1
DVFLT = 0x1
Hz
dB
Voice Path Phase Delay
P
DLY
Total Harmonic Distortion
ADC Level Adjust Range
THD
AV
ADC
f = 1kHz, f
S
= 8kHz, T
A
= +25°C, 0dBFS
AVL/AVR = 0xF to 0x0
V
AVDD
= 1.65V to 1.95V, input referred
f = 217Hz, V
RIPPLE
= 100mV, AV
ADC
= 0dB,
input referred
Power-Supply Rejection Ratio
PSRR
f = 1kHz, V
RIPPLE
= 100mV, AV
ADC
= 0dB,
input referred
f = 10kHz, V
RIPPLE
= 100mV, AV
ADC
= 0dB,
input referred
ADC VOICE MODE DIGITAL IIR LOWPASS FILTER
With respect to f
S
within ripple;
f
S
= 8kHz to 48kHz
-3dB cutoff
Passband Ripple
Stopband Cutoff
Stopband Attenuation
f
SLP
f < f
PLP
With respect to f
S
; f
S
= 8kHz to 48kHz
f > f
SLP
, f = 20Hz to 20kHz
74
0.445 x
f
S
0.449 x
f
S
±0.1
0.469 x
f
S
dB
Hz
dB
Passband Cutoff
f
PLP
Hz
_______________________________________________________________________________________
5
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