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AD1981BLJSTZ

AC ’97 SoundMAX® Codec

Analog Devices 

AD1981BL

Pin No.

22

23

24

35

36

37

39

41

FILTER/REFERENCE2

27

28

29

30

31

32

POWER AND GROUND

SIGNALS

1

4

7

9

25

26

38

40

43

44

34

33

NO CONNECTS

12

42

Mnemonic

MIC2

LINE_IN_L

LINE_IN_R

LINE_OUT_L

LINE_OUT_R

MONO_OUT

HP_OUT_L

HP_OUT_R

I/O Description

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

(Stereo MIC).

I Line-In Left Channel.

I Line-In Right Channel.

O Line-Out (Front) Left Channel.

O Line-Out (Front) Right Channel.

O Monaural Output to Telephony Subsystem Speaker Phone.

O Headphone Left-Channel Output.

O Headphone Right-Channel Output.

VREF

VREFOUT

AFILT1

AFILT2

AFILT3

AFILT4

O Voltage Reference Filter.

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

O Antialiasing Filter Capacitor—ADC Right Channel.

O Antialiasing Filter Capacitor—ADC Left Channel.

O Antialiasing Filter Capacitor—Mixer ADC Right Channel.

O Antialiasing Filter Capacitor—Mixer ADC Left Channel.

DVDD1

DVSS1

DVSS2

DVDD2

AVDD1

AVSS1

AVDD2

AVSS2

AVDD3

AVSS3

AVDD4

AVSS4

NC

NC

I Digital VDD, 3.3 V.

I Digital GND.

I Digital GND.

I Digital VDD, 3.3 V.

I Analog VDD, 3.3 V.

I Analog GND.

I Analog VDD, 3.3 V.

I Analog GND.

I Analog VDD, 3.3 V.

I Analog GND.

I Analog VDD, 3.3 V.

I Analog GND.

No Connect.

No Connect.

1 These pins can also be used to select an external clock. See Table 44.

2 These signals are connected to resistors, capacitors, or specific voltages.

Rev. A | Page 11 of 32

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