AD1981B データシートの表示（PDF） - Analog Devices

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AD1981B

AC ’97 SoundMAX® Codec

Analog Devices 

AD1981B

Pin No.

Mnemonic

PIN FUNCTION DESCRIPTIONS

I/O

Function

DIGITAL I/O

2

XTL_IN

I

Crystal Input (24.576 MHz) or External Clock Input.

3

XTL_OUT

O

Crystal Output.

5

SDATA_OUT

I

AC-Link Serial Data Output, AD1981B Data Input Stream.

6

BIT_CLK

O/I

AC-Link Bit Clock Output (12.288 MHz) or Bit Clock Input if Secondary Mode

Selected.

8

SDATA_IN

O

AC-Link Serial Data Input, AD1981B Data Output Stream.

10

SYNC

I

AC-Link Frame Sync.

11

RESET

I

AC-Link Reset, AD1981B Master Hardware Reset.

48

SPDIF

O

S/PDIF Output.

CHIP SELECTS (These pins can also be used to select an external clock. See Table IX.)

45

ID0

46

ID1

I

Chip Select Input 0 (Active Low). This pin can also be used as the chain input from

a secondary codec.

I

Chip Select Input 1 (Active Low).

JACK SENSE AND EAPD

17

JS0

I

Jack Sense 0 Input.

16

JS1

I

Jack Sense 1 Input.

47

EAPD

O

External Amp Power-Down Control.

ANALOG I/O

13

PHONE_IN

I

Phone Input. Mono input from telephony subsystem speaker phone or handset.

14

AUX_L

I

Auxiliary Input Left Channel.

15

AUX_R

I

Auxiliary Input Right Channel.

18

CD_L

I

CD Audio Left Channel.

19

CD_GND_REF

I

CD Audio Analog Ground Reference for Differential CD Input.

20

CD_ R

I

CD Audio Right Channel.

21

MIC1

I

Microphone 1 Input (Mono) or Left Channel when 2-Channel Mode

Selected (Stereo MIC).

22

MIC2

I

Microphone 2 Input (Mono) or Right Channel when 2-Channel Mode

Selected (Stereo MIC).

23

LINE_IN_L

I

Line In Left Channel.

24

LINE_IN_R

I

Line In Right Channel.

35

LINE_OUT_L

O

Line Out (Front) Left Channel.

36

LINE_OUT_R

O

Line Out (Front) Right Channel.

37

MONO_OUT

O

Monaural Output to Telephony Subsystem Speakerphone.

39

HP_OUT_L

O

Headphone Left Channel Output.

41

HP_OUT_R

O

Headphone Right Channel Output.

FILTER/REFERENCE (These signals are connected to resistors, capacitors, or specific voltages.)

27

VREF

O

Voltage Reference Filter.

28

VREFOUT

O

Voltage Reference Output 5 mA Drive (Intended for MIC Bias and Power Amp Bias).

29

AFILT1

O

Antialiasing Filter Capacitor—ADC Right Channel.

30

AFILT2

O

Antialiasing Filter Capacitor—ADC Left Channel.

31

AFILT3

O

Antialiasing Filter Capacitor—Mixer ADC Right Channel.

32

AFILT4

O

Antialiasing Filter Capacitor—Mixer ADC Left Channel.

POWER AND GROUND SIGNALS

1

4

7

9

25

26

38

40

43

44

34

33

NO CONNECTS

DVDD1

DVSS1

DVSS2

DVDD2

AVDD1

AVSS1

AVDD2

AVSS2

AVDD3

AVSS3

AVDD4

AVSS4

I

Digital VDD 3.3 V.

I

Digital GND.

I

Digital GND.

I

Digital VDD 3.3 V.

I

Analog VDD 5.0 V.

I

Analog GND.

I

Analog VDD 5.0 V.

I

Analog GND.

I

Analog VDD 5.0 V.

I

Analog GND.

I

Analog VDD 5.0 V.

I

Analog GND.

12

NC

42

NC

No Connect.

No Connect.

–8–

REV. B

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