19-1288; Rev 2; 12/11
KIT
ATION
EVALU
BLE
AVAILA
Low-Power Audio CODEC with
DirectDrive Headphone Amplifiers
General Description
Features
o
1.71V to 3.6V Single-Supply Operation
o
Stereo 30mW DirectDrive Headphone Amplifier
o
Stereo 1V
RMS
DirectDrive Line Outputs
(V
DD
= 1.8V) and Stereo Line Inputs
o
Low-Noise Stereo and Mono Differential
Microphone Inputs with Automatic Gain Control
and Noise Quieting
o
9mW Playback Power Consumption (V
DD
= 1.8V)
o
91dB 96kHz 18-Bit Stereo DAC
o
85dB 48kHz 18-Bit Stereo ADC
o
Supports Any Master Clock Frequency from
10MHz to 60MHz
o
ADCs and DACs Can Run at Independent Sample
Rates
o
Flexible Audio Mixing and Volume Control
o
Clickless/Popless Operation
o
Headset Detection Logic
o
I
2
C Control Interface
MAX9856
The MAX9856 is a high-performance, low-power stereo
audio CODEC designed for MP3, personal media play-
ers (PMPs), or other portable multimedia devices.
Using on-board stereo DirectDrive
®
headphone ampli-
fiers, the CODEC can output 30mW into stereo 32Ω
headphones while operating from a single 1.8V power
supply. Very low 9mW playback power consumption
makes it an ideal choice for battery-powered applica-
tions. The MAX9856 provides microphone input ampli-
fiers, plus flexible input selection, signal mixing, and
automatic gain control (AGC). Comprehensive load-
impedance sensing allows the MAX9856 to autodetect
most common audio and audio/video headset and jack
plug types.
Outputs include stereo DirectDrive line outputs and
DirectDrive headphone amplifiers. The stereo ADC can
convert audio signals from either internal or external
microphones that can be configured for single-ended
or differential signal inputs. Line inputs can be config-
ured as stereo, differential, or mono and fed through
one channel of the microphone path. The analog inputs
selected can be gain ranged or mixed with other input
sources prior to conversion to digital. The ADC path
also features programmable digital highpass filters to
remove DC offset voltages and wind noise.
The MAX9856 supports all common sample rates from
8kHz to 48kHz in both master and slave mode. The ser-
ial digital audio interfaces support a variety of formats
including I
2
S, left-justified, and PCM modes.
The MAX9856 uses a thermally efficient, space-saving
40-pin, 6mm x 6mm x 0.8mm TQFN package.
Ordering Information
PART
MAX9856ETL+
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
40 TQFN-EP*
MAX9856GTL/V+
-40°C to +105°C
40 TQFN-EP*
+Denotes
a lead-free/RoHS-compliant package.
*EP
= Exposed pad.
/V denotes an automotive qualified part.
Simplified Block Diagram
DVDD AND DVDDS2
1.71V TO 3.6V
AVDD AND CPVDD
1.71V TO 3.6V
Applications
MP3 Players
Personal Media Players
Handheld Gaming Consoles
Cellular Phones
AUXIN
LINEIN1
LINEIN2
SDOUT
SDIN
BCLK
LRCLK_D
LRCLK_A
MUX
DIGITAL
FILTERING
AND
MIXERS
DAC
ADC
DIGITAL
INTERFACE
ADC
ANALOG
MIXERS
LEFT LINE
OUT
RIGHT LINE
OUT
DIFF
MIC
LEFT
EXT
MIC
RIGHT
EXT
MIC
MAX9856
DAC
Pin Configuration appears at end of data sheet.
SDA
SCL
I
2
C
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
IRQ
CLOCK
CONTROL
MCLK
________________________________________________________________
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.
Low-Power Audio CODEC with
DirectDrive Headphone Amplifiers
MAX9856
ABSOLUTE MAXIMUM RATINGS
(Voltages with respect to AGND.)
AVDD, DVDD, DVDDS2, CPVDD .............................-0.3V to +4V
PVSS, SVSS........................................Capacitor connection only
AGND, DGND, CPGND.........................................-0.3V to +0.3V
HPL, HPR .................................(V
SVSS
- 0.3V) to (V
AVDD
+ 0.3V)
HGNDSNS, LGNDSNS, MICGND .........................-0.3V to +0.3V
JACKSNS .................................(V
SVSS
- 0.3V) to (V
AVDD
+ 0.3V)
LOUTL, LOUTR ........................(V
SVSS
- 0.3V) to (V
AVDD
+ 0.3V)
LINEIN1, LINEIN2, AUXIN ...........................................-2V to +2V
MICL, MICR, INLP, INLM, INRM..................................-2V to +2V
C1N........................................(V
PVSS
- 0.3V) to (V
CPGND
+ 0.3V)
C1P .....................................(V
CPGND
- 0.3V) to (V
CPVDD
+ 0.3V)
PREG, REF, MBIAS, MICBIAS................-0.3V to (V
AVDD
+ 0.3V)
NREG ......................................................(V
SVSS
- 0.3V) to +0.3V
MCLK........................................................................-0.3V to +4V
SDA, SCL,
IRQ
.........................................................-0.3V to +4V
LRCLK_A, LRCLK_D, BCLK,
SDIN, SDOUT ..................................-0.3V to (V
DVDDS2
+ 0.3V)
Continuous Current Into/Out of HPR/HPL/
LOUTL/LOUTR ...............................................................150mA
CPVDD/CPGND/C1P/C1N/PVSS ......................................300mA
Any Other Pin ......................................................................20mA
Duration of HPR/HPL/LOUTL/LOUTR Short Circuit
to AVDD/AGND/CPVDD/CPGND ............................Continuous
Continuous Power Dissipation (T
A
= +70°C)
40-Pin TQFN (derate 26.3mW/°C above +70°C,
single-layer board) ......................................................2105mW
40-Pin TQFN (derate 37mW/°C above +70°C,
multilayer board) .........................................................2963mW
Operating Temperature Ranges:
E Series.............................................................-40°C to +85°C
G Series ..........................................................-40°C to +105°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
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
CPVDD
= V
DVDDS2
= V
DVDD
= 1.8V, R
HP
= 32Ω, R
LINE
= 10kΩ, C1 = 4.7µF, C2 = 4.7µF, C
REF
= C
MBIAS
= C
PREG
=
C
NREG
= 1µF, A
VPRE
= +20dB, C
MICBIAS
= 1µF, A
VMIGPGA
= 0dB, f
MCLK
= 11.2896MHz, DRATE = 00, T
A
= T
MIN
to T
MAX
, unless
otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
AVDD = CPVDD (inferred from HP output
PSRR)
Supply Voltage Range
DVDD, DVDDS2 (inferred from CODEC
performance tests)
DAC playback mode
(f
S
= 44.1kHz) analog
Line-only playback mode
(DAC/ADC disabled)
DAC + line input
playback mode
(f
S
= 44.1kHz)
Total Supply Current (Note 2)
I
VDD
Full operation, f
S
=
44.1kHz (DAC + ADC +
LINEIN + MIC + AUXIN)
DAC playback, f
S
=
44.1kHz mono ADC
record f
S
= 8kHz
ADC record,
f
S
= 44.1kHz
Shutdown Supply Current
Shutdown to Full Operation
I
AVDD
+ I
CPVDD
I
DVDD
+ I
DVDDS2
I
AVDD
+ I
CPVDD
I
DVDD
+ I
DVDDS2
I
AVDD
+ I
CPVDD
I
DVDD
+ I
DVDDS2
I
AVDD
+ I
CPVDD
I
DVDD
+ I
DVDDS2
I
AVDD
+ I
CPVDD
I
DVDD
+ I
DVDDS2
I
AVDD
+ I
CPVDD
I
DVDD
+ I
DVDDS2
I
AVDD
+ I
CPVDD
I
DVDD
+ I
DVDDS2
1.71
1.80
2.9
2.3
2.9
0.14
3.9
2.3
11.0
3.7
6.6
2.8
7.8
2.3
2.2
0.6
50
4.3
0.20
5.4
3.5
15.5
4.5
9.1
3.5
10.5
3.5
10
10
µA
ms
mA
3.60
5.1
MIN
1.71
TYP
1.80
MAX
3.60
V
UNITS
2
_______________________________________________________________________________________
Low-Power Audio CODEC with
DirectDrive Headphone Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
CPVDD
= V
DVDDS2
= V
DVDD
= 1.8V, R
HP
= 32Ω, R
LINE
= 10kΩ, C1 = 4.7µF, C2 = 4.7µF, C
REF
= C
MBIAS
= C
PREG
=
C
NREG
= 1µF, A
VPRE
= +20dB, C
MICBIAS
= 1µF, A
VMIGPGA
= 0dB, f
MCLK
= 11.2896MHz, DRATE = 00, T
A
= T
MIN
to T
MAX
, unless
otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
STEREO DAC (Note 3)
Gain Error
Channel Gain Mismatch
DAC DYNAMIC SPECIFICATIONS
f
S
= 44.1kHz, A-weighted, DRATE = 10
Dynamic Range (Note 4)
Total Harmonic Distortion
Signal-to-Noise Ratio
Crosstalk
Power-Supply Rejection Ratio
PSRR
THD
SNR
f
S
= 8kHz to 96kHz,
A-weighted
DRATE = 00
DRATE =10
DRATE = 00
DRATE = 10
80
91
87
91
82
87
91
78
93
60
0.44
±0.1
0.58
f > f
S
58
-6.02
f
P
f
S
f > f
S
-0.2dB from peak
f < 0.23 x f
S
0.24
±0.1
0.5
54
-60
DACHP = 000
DACHP = 001; LRCLK/1598
DACHP = 010; LRCLK/798
-3dB Corner Frequency
(f
S
= 44.1kHz)
HP
FILT
DACHP = 011; LRCLK/398
DACHP = 100; LRCLK/197
DACHP = 101; LRCLK/97
DACHP = 110; LRCLK/47
DACHP = 111; LRCLK/22
DC Attenuation
DC
ATTEN
DACHP
≠
000
Disabled
28
55
111
224
455
938
2004
60
dB
Hz
dB
dB
dB
dB
dB
±1
±1
±5
%
%
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX9856
f
IN
= 1kHz, f
S
= 8kHz to 96kHz, 0dBFS
f
S
= 8kHz to 96kHz,
A-weighted (Note 5)
Driven channel at -1dBFS, f
IN
= 1kHz,
f
S
= 8kHz
f = 217Hz, V
RIPPLE
= 100mV, A
VPGA
= 0dB
f = 10kHz, V
RIPPLE
= 100mV, A
VPGA
= 0dB
-0.2dB from peak
f < 0.44 x f
S
f
S
DAC DIGITAL FILTER (8x interpolation, FIR (f
S
= 7.8kHz to 50kHz))
Passband Cutoff
Passband Ripple
Stopband Cutoff
Stopband Attenuation
Attenuation at f
S
/2
DAC DIGITAL FILTER (4x interpolation, FIR (f
S
= 50kHz to 100kHz))
Passband Cutoff
Passband Ripple
Stopband Cutoff
Stopband Attenuation
Attenuation at f
S
/2
DAC HIGHPASS FILTER
f
S
dB
f
S
dB
dB
f
P
f
S
dB
f
S
dB
dB
_______________________________________________________________________________________
3
Low-Power Audio CODEC with
DirectDrive Headphone Amplifiers
MAX9856
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
CPVDD
= V
DVDDS2
= V
DVDD
= 1.8V, R
HP
= 32Ω, R
LINE
= 10kΩ, C1 = 4.7µF, C2 = 4.7µF, C
REF
= C
MBIAS
= C
PREG
=
C
NREG
= 1µF, A
VPRE
= +20dB, C
MICBIAS
= 1µF, A
VMIGPGA
= 0dB, f
MCLK
= 11.2896MHz, DRATE = 00, T
A
= T
MIN
to T
MAX
, unless
otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
STEREO ADC (Note 6)
Gain Error
Full-Scale Conversion
Channel Gain Mismatch
ADC DYNAMIC SPECIFICATIONS
f
S
= 8kHz to 32kHz, BW = 22Hz to f
S
/2
Dynamic Range (Note 4)
f
S
= 44.1kHz, BW = 22Hz to 20kHz,
A-weighted
f
S
= 48kHz, BW = 22Hz to 20kHz,
A-weighted
Total Harmonic Distortion
THD
1kHz, 0dBFS, f
S
= 8kHz
1kHz, 0dBFS, f
S
= 48kHz
1kHz, 0dBFS, f
S
= 8kHz, BW = 22Hz to
20kHz, A-weighted
Signal-to-Noise Ratio
SNR
1kHz, 0dBFS, f
S
= 48kHz, BW = 22Hz to
20kHz, A-weighted
Channel Crosstalk
Power-Supply Rejection Ratio
(Note 7)
ADC DIGITAL FILTER PATH
Passband Cutoff
Passband Ripple
Stopband Cutoff
Stopband Attenuation
Attenuation at f
S
/2
ADC HIGHPASS FILTER
ADCHP = 000
ADCHP = 001; LRCLK/1598
ADCHP = 010; LRCLK/798
-3dB Corner Frequency
(f
S
= 44.1kHz)
HP
FILT
ADCHP = 011; LRCLK/398
ADCHP = 100; LRCLK/197
ADCHP = 101; LRCLK/97
ADCHP = 110; LRCLK/47
ADCHP = 111; LRCLK/22
DC Attenuation
DC Output Offset
DC
ATTEN
ADCHP anything other than 000
ADCHP = 000
Disabled
28
55
111
224
455
938
2004
90
-40
dB
dBFS
Hz
f
S
f > f
S
f
P
-0.2dB from peak
f < f
P
0.44
±0.1
0.56
60
-6.02
f
S
dB
f
S
dB
dB
Driven channel at -1dBFS, f
IN
= 1kHz,
f
S
= 8kHz
V
AVDD
= 1.71V to 3.6V
PSRR
f = 1kHz, V
RIPPLE
= 100mV
f = 10kHz, V
RIPPLE
= 100mV
60
77
65
100
80
50
dB
dB
78
80
84
85
-63
-68
77
dB
dB
dB
0dBFS
f
IN
= 1kH
Z
, line input PGA = 0dB
±1
2
±1
±5
%
V
P-P
%
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
4
_______________________________________________________________________________________
Low-Power Audio CODEC with
DirectDrive Headphone Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
CPVDD
= V
DVDDS2
= V
DVDD
= 1.8V, R
HP
= 32Ω, R
LINE
= 10kΩ, C1 = 4.7µF, C2 = 4.7µF, C
REF
= C
MBIAS
= C
PREG
=
C
NREG
= 1µF, A
VPRE
= +20dB, C
MICBIAS
= 1µF, A
VMIGPGA
= 0dB, f
MCLK
= 11.2896MHz, DRATE = 00, T
A
= T
MIN
to T
MAX
, unless
otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX9856
ADC/DAC DATA RATE ACCURACY
LRCLK_D and LRCLK_A Output
Average Sample Rate Deviation
(Master Mode, Any MCLK)
LRCLK_D Output Sample Rate
Deviation (Master Mode)
LRCLK Input Sample Rate Range
(Slave Mode)
LRCLK_D and LRCLK_A PLL
Lock Time
LRCLK_D and LRCLK_A
Acceptable Jitter for Maintaining
PLL Lock (All Slave Modes)
HEADPHONE AMPLIFIERS
Output Power
0dBFS DAC Output Voltage
Line In to HP Out Voltage Gain
Output Offset Voltage
Total Harmonic Distortion Plus
Noise
Dynamic Range
V
OS
THD+N
DR
P
OUT
f = 1kHz, THD < 1%,
T
A
= +25°C
+0dB volume setting
+4.5dB volume setting, 0dB PGA setting
T
A
= +25°C, -40dB volume setting
R
L
= 32Ω, P
OUT
= 25mW, f = 1kHz
R
L
= 16Ω, P
OUT
= 25mW, f = 1kHz
+5.5dB volume setting, DAC input at
f
S
= 44.1kHz (Note 4)
V
AVDD
= 1.71V to 3.6V
Power-Supply Rejection Ratio
Capacitive Drive
Crosstalk
Channel Gain Matching
Click-and-Pop Level
LINE AMPLIFIERS
0dBFS DAC Output Voltage
Line-In to Line-Out Voltage Gain
Output Offset Voltage
V
OS
0dB input PGA setting
T
A
= +25°C
1.3
1.0
1.34
±0.7
1.4
±10
V
RMS
V/V
mV
A
VMATCH
Peak voltage,
A-weighted, 32 samples
per second
Into shutdown
Out of shutdown
PSRR
C
L
V
RIPPLE
= 100mV
P-P
, f = 217Hz
V
RIPPLE
= 100mV
P-P
, f = 10kHz
No sustained oscillations
P
OUT
= 1.6mW, f = 1kHz, (HPL to HPR) or
(HPR to HPL)
80
70
R
L
= 16Ω
R
L
= 32Ω
15
3.40
35
28
3.51
1.77
±0.6
0.03
0.05
91
94
80
50
150
69
±2
-70
dBV
-70
pF
dB
%
dB
±4
3.80
mW
V
P-P
V/V
mV
%
dB
t
LOCK
(Note 8)
PCLK/LRCLK = 1536, 1024, 768, 512, 384,
256, 192, or 128
LRCLK_A, LRCLK_D (DHF = 0)
LRCLK_D (DHF = 1)
Any allowable LRCLK and PCLK rates
Allowable LRCLK period change from
nominal for slave PLL mode at any
allowable LRCLK and PCLK rates
7.8
15.6
12
-0.025
+0.025
%
0
50
100
25
%
kHz
ms
±20
ns
_______________________________________________________________________________________
5
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