max9856 Maxim Integrated Products, Inc., max9856 Datasheet - Page 17

• Manufacturer Part Number: max9856
• Description: Max9856 Low-power Audio Codec With Directdrive Headphone Amplifiers
• Manufacturer: Maxim Integrated Products, Inc.

10kΩ
DVDD
10kΩ
10kΩ
DVDD
1μF
1μF
1μF
29
24
25
27
26
23
30
21
22
2
3
1
SCL
LINEIN1
LINEIN2
AUXIN
LRCLK_A
LRCLK_D
BCLK
SDIN
SDOUT
IRQ
MCLK
SDA
39
______________________________________________________________________________________
AGND
1.71V TO 3.6V
20
CPVDD
DIGITAL AUDIO
CONTROL LOGIC
32
DGND
INTERFACE
TIMING AND
I
2
C SERIAL
PORT
-32dB TO +30dB
-32dB TO +30dB
-32dB TO +30dB
CPGND
PGA
PGA
PGA
4.7μF
18
DirectDrive Headphone Amplifiers
12
AVDD
FILTERING AND
FILTERING AND
1μF
LN1
LN2
AUXAC
AUXDC
DIGITAL
DIGITAL
GAIN
GAIN
4
PREG
0.1μF
1μF
Low-Power Audio CODEC with
INTERNAL REGULATORS
5
NREG
AUXDC
10μF
RIGHT
RIGHT
1μF
1.71V TO 3.6V
LEFT
LEFT
DAC
DAC
ADC
ADC
31
DACR
DVDD
DACL
MICR
MICL
LN1
LN2
LN1
LN2
AUTOMATIC GAIN CONTROL
6
MBIAS
1μF
RIGHT AUDIO
LEFT AUDIO
DACL
DACR
INPUT MIXER
INPUT MIXER
RIGHT ADC
OUTPUT
OUTPUT
LEFT ADC
MIXER
MIXER
1μF
REF
7
C1N
DVDDS2
28
17
MAX9856
4.7μF
AUXAC
LN1
LN2
MICL
MICR
AUXAC
LN1
LN2
MICL
MICR
C1
C1P
19
MICR
MICL
PGA
PGA
1μF
0 TO 20dB
AUXAC
0 TO 20dB
PVSS
CHARGE
16
PUMP
-73dB
-73dB
TO +6dB
TO +6dB
PGA
PGA
C2
4.7μF
SVSS
PREAMPLIFIER
PREAMPLIFIER
15
Functional Diagram
MICROPHONE
20dB
30dB
20dB
30dB
DETECTION
BIAS AND
0
0
JACK
HGNDSNS
LGNDSNS
JACKSNS
MICBIAS
MICGND
LOUTL
LOUTR
MICL
MICR
INLP
INLN
HPL
HPR
13
14
11
9
10
8
34
33
35
36
37
40
38
1μF
1μF
1μF
1μF
1μF
2.2kΩ
17