AD1881 查看數據表（PDF） - Analog Devices
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AD1881 Datasheet PDF : 22 Pages
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RNRLOGDEVICES fRX-ON-DEHRND HOTLINE - Page 17
AD1881
PIN FUNCTION DESCRIPTIONS
Digital I/O
Pin Name
XTL_IN
XTL- OUI'
SDATA_OUI'
BIT_CLK
SDATA_IN
SYNC
RESET
LQFP
2
3
5
6
8
10
11
110
Description
I
Crystal (or Clock) Input, 24.576 MHz.
o
Crystal Output.
I
AC-Unk Serial Data Output, ADl881 Input Stream.
O/I* AC-Unk Bit Clock. 12.288 MHz Serial Data Clock. Daisy Chain Output Clock.
o
AC-Unk Serial Data Input. AD1881 Output Stream.
I
AC-Unk Frame Sample Sync 48 kHz Fixed Rate.
I
AC-Unk Reset. AD1881 Master H/W Reset.
*Input if eonfigured as a slave device.
Daisy Chain Connections
OBSOLETE Pin Name
CSO
CSI
EAPD
CHAIN_IN
CHAIN_CLK
LQFP
45
46
47
48
Type
I
I
o
I
I/O
Description
Daisy Chain Codec Select LSB, ADC/DAC Right Bit Streams.
Daisy Chain Codec Select MSB, ADC/DAC Left Bit Streams.
External Amp Power-Down Control Signal, Default 1..0, Active HI
Daisy Chain Data Input for Data from Slave Codecs SDATA_IN.
24.576 MHz Buffered Clock Input/Output for Slave Codecs.
Analog I/O
These signals connect the AD1881 component
Pin Name
LQFP
110
PC_BEEP
12
I
PHONE_IN
13
I
AlJX_L
14
I
AU}CR
15
I
VIDEO_L
16
I
VIDEO_R
17
I
CD_L
18
I
to analog sources and sinks, including microphones and speakers.
Description
PC Beep. PC Speaker Beep Passthrough.
Phone. From Telephony Subsystem Speakerphone or Handset.
Auxiliary Input Left Olannel.
Auxiliary Input Right Olannel.
Video Audio Left Channel.
Video Audio Right Olannel.
CD Audio Left Channel.
CD_GND_REF
19
I
CD Audio Analog Ground Reference for Differential CD Input.
CD_R
20
I
CD Audio Right Channel.
MICI
21
I
Microphone 1. Desktop Microphone Input.
MIC2
22
I
Microphone 2. Second Microphone Input.
UNE_IN_L
23
I
Une In Left Channel.
UNE_IN_R
24
I
Une In Right Channel.
UNE- OUI' _L
35
o
Une Out Left Channel.
UNE- OUI' _R
36
MONO_OUI'
37
o
Une Out Right Channel.
o
Monaural Output to Telephony Subsystem Speakerphone.
LNLVL_OUI'_L
39
o
Une-Level Output Left Olannel.
LNLVL_OUI'_R
41
o
Une-Level Output Right Channel.
Filter/Reference
These signals are connected to resistors, capacitors, or specific voltages.
Pin Name
LQFP
110 Description
VREF
27
VREF o UI'
28
AFILTI
29
AFILT2
30
FILT_R
31
FILT_L
32
RX3D
33
CX3D
34
o
Voltage Reference Filter.
o
Voltage Reference Output 5 mA Drive (Intended for MIC Bias).
o
Antialiasing Filter Capacitor-ADC Right Olannel.
o
Antialiasing Filter Capacitor-ADC Left Olannel.
o
AC-Coupling Filter Capacitor-ADC Right Olannel.
o
AC-Coupling Filter Capacitor-ADC Left Olannel.
o
3D Phat Stereo Enhancement-capacitor.
I
3D Phat Stereo Enhancement-capacitor.
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