AD1885

–22–

REV. 0

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.

Figure 9. Recommended One-Codec PWR/Decoupling and AC‘97 Connections

LINE_OUT_R

LINE_OUT_L

CX3D

RX3D

FILT_L

FILT_R

AFILT2

AFILT1

VREFOUT

VREF

AVSS1

AVDD1

AD1885

1

2

3

4

5

6

7

8

9

10

11

12

36

35

34

33

32

31

30

29

28

27

26

25

+

AVDD

47nF

+

+

AVDD

270pF NPO

270pF NPO

+

47pF

PC_BEEP

22pF

22pF

24.576MHz

+

DVDD

NOTE:

IF NOT USED, GROUND

JACK SENSE PINS.

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

10k

DVDD1

XTL_IN

XTL_OUT

DVSS1

SDATA_OUT

BIT_CLK

DVSS2

SDATA_IN

DVDD2

SYNC

RESET

PC_BEEP

SDATA_OUT

SDATA_IN

SYNC

RESET

BIT_CLK