AD1885
APPLICATIONS CIRCUITS
The AD1885 has been designed to require a minimum amount of external circuitry. The recommended applications circuits are shown in
Figures 9–18. Reference designs for the AD1885 are available and may be obtained by contacting your local Analog Devices
sales representative or authorized distributor. Example shell programs for establishing a communications path between the AD1885
and an ADSP-21xx or ADSP-21xxx are also available.
AVDD
+
NOTE:
IF NOT USED, GROUND
JACK SENSE PINS.
DVDD
+
22pF
1
2
36
35
34
33
32
31
30
29
28
27
26
25
24.576MHz
DVDD1
LINE_OUT_R
LINE_OUT_L
CX3D
22pF
XTL_IN
3
47nF
XTL_OUT
DVSS1
SDATA_OUT
BIT_CLK
DVSS2
4
RX3D
+
+
5
FILT_L
6
FILT_R
7
AD1885
AFILT2
8
SDATA_IN
DVDD2
AFILT1
270pF NPO
9
VREFOUT
VREF
SDATA_OUT
270pF NPO
10
11
12
SYNC
SDATA_IN
SYNC
RESET
AVSS1
AVDD1
PC_BEEP
+
RESET
BIT_CLK
47pF
10k
AVDD
PC_BEEP
NOTE:
ALL “UNUSED” ANALOG INPUTS
(LINE_IN_L/R, AUX_L/R,VIDEO_L/R,
MIC1, MIC2, PC_BEEP, PHONE_IN
AND CD_L/R/GND) MUST BE LEFT
UNCONNECTED.
FB 600Z
Figure 9. Recommended One-Codec PWR/Decoupling and AC‘97 Connections
REV. 0
–22–
ADI [ ADI ]
