Table of Contents
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Digital I/O
Pin Name
TQFP
XTL_IN
2
XTL_OUT
3
SDATA_OUT
5
BIT_CLK
6
SDATA_IN
8
SYNC
10
RESET
11
Chip Selects
Pin Name
TQFP
ID0
45
ID1
46
Analog I/O
These signals connect the AD1887 component to analog sources and sinks, including microphones and speakers
Pin Name
TQFP
CD_L
18
CD_GND_REF
19
CD_ R
20
MIC
21
LINE_IN_L
23
LINE_IN_R
24
HP_OUT_L
39
HP_OUT_R
41
Filter/Reference
These signals are connected to resistors, capacitors, or specific voltages
Pin Name
TQFP
V
27
REF
V
28
REFOUT
AFILT1
29
AFLIT2
30
FILT_R
31
FILT_L
32
Power and Ground Signals
Pin Name
TQFP
DV
1
1
DD
DV
1
4
SS
DV
2
7
SS
DV
2
9
DD
AV
1
25
DD
AV
1
26
SS
AV
2
38
DD
AV
2
40
SS
AV
3
43
DD
AV
3
44
SS
REV. 0
PIN FUNCTION DESCRIPTIONS
I/O
Description
I
Crystal (or Clock) Input, 24.576 MHz
O
Crystal Output
I
AC-Link Serial Data Output, AD1887 Input Stream
O/I
AC-Link Bit Clock 12288 MHz Serial Data Clock Daisy Chain Output Clock
O
AC-Link Serial Data Input AD1887 Output Stream
I
AC-Link Frame Sync
I
AC-Link Reset AD1887 Master H/W Reset
Type
Description
I
Chip Select Input 0 (Active Low)
I
Chip Select Input 1 (Active Low)
I/O
Description
I
CD Audio Left Channel
I
CD Audio Analog Ground Reference for Differential CD Input
I
CD Audio Right Channel
I
Microphone Input
I
Line in Left Channel
I
Line in Right Channel
O
Headphones Out Left Channel
O
Headphones Out Right Channel
I/O
Description
O
Voltage Reference Filter
O
Voltage Reference Output 5 mA Drive (Intended for Mic Bias)
O
Antialiasing Filter Capacitor—ADC Right Channel
O
Antialiasing Filter Capacitor—ADC Left Channel
O
AC-Coupling Filter Capacitor—ADC Right Channel
O
AC-Coupling Filter Capacitor—ADC Left Channel
Type
Description
I
Digital V
33 V
DD
I
Digital GND
I
Digital GND
I
Digital V
33 V
DD
I
Analog V
DD
I
Analog GND
I
Analog V
DD
I
Analog GND
I
Analog V
DD
I
Analog GND
50 V
50 V
50 V
–7–
AD1887
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