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AD1984AJCPZ

High Definition Audio SoundMAX Codec

Analog Devices 

AD1984A

Table 4. Pin Function Descriptions

Mnemonic

Pin No.

I/O

Description

DIGITAL INTERFACE

SDATA_OUT

5

BIT_CLK

6

SDATA_IN

8

SYNC

10

RESET

11

DIGITAL I/O and EAPD

DM_1/2

2

DM_2

4

DM_CLK

46

GPIO_2

30

MIC_BIAS-E/GPIO_1

31

EAPD/GPIO_0

47

SPDIF_OUT

48

JACK SENSE

SENSE_A/SRC_B

13

SENSE_B/SRC_A

34

ANALOG I/O

PCBEEP

12

PORT-E_L

14

PORT-E_R

15

PORT-F_L

16

PORT-F_R

17

CD_GND (PORT F)

19

I

Link Serial Data Output. AD1984A input stream. Clocked on both edges of the

BIT_CLK.

I

Link Bit Clock. 24.000 MHz serial data clock.

I/O

Link Serial Data Input. AD1984A output stream clocked only on one edge of BIT_CLK.

Link Frame Sync.

I

Link Reset. AD1984A master hardware reset.

I

I

Digital Microphone 1 and 2 Inputs (for Biphase Microphones), or Digital Microphone

1 Input (for Single-phase Microphones).

I

Digital Microphone 2 Input (for Single-phase Microphones).

O

Clock to Drive External Digital Microphones.

I/O

General-Purpose Input/Output Pins. Digital signals used to control or sense external

circuitry.

I/O

Microphone Bias for Port E/General-Purpose Input/Output. Capable of high-Z, 1.65 V,

and 2.86 V. Pin 31 shares functionality between MIC_BIAS_E (default) and GPIO_1.

These functions are mutually exclusive and the MIC_BIAS function takes priority over

the GPIO function.

I/O

EAPD/General-Purpose Input/Output pin. Pin 47 shares functionality between

GPIO_0 and EAPD. These functions are mutually exclusive and the EAPD function

takes priority over the GPIO function. By default, the pin is in a high-Z state. External

resistors should be used to ensure the proper circuit state when this pin is in high-Z.

O

Supports S/PDIF Output.

I/O

Jack Sense A-D Input/Sense B drive.

I/O

Jack Sense E-F Input/Sense A drive.

LI

Monaural Input from System for Analog PCBeep.

LI, MIC, LO Auxiliary Input/Output Left Channel.

LI, MIC, LO Auxiliary Input/Output Right Channel.

LI, LO Auxiliary Input/Output Left Channel.

LI, LO Auxiliary Input/Output Right Channel.

I

CD Audio Analog Ground Reference. Must be connected to AGND via a 0.1 μF

capacitor if not in use as CD_GND. MUST always be ac-coupled.

PORT-B_L

PORT-B_R

PORT-C_L

PORT-C_R

MONO_OUT

PORT-D_L

PORT-D_R

PORT-A_L

PORT-A_R

21

LI, MIC Front Panel Stereo MIC/Line-In.

22

LI, MIC Front Panel Stereo MIC/Line-In.

23

LI, MIC Rear Panel Stereo MIC/Line-In.

24

LI, MIC Rear Panel Stereo MIC/Line-In.

32

LO

Monaural Output to Internal Speaker or Telephony Subsystem Speakerphone.

35

HP, LO Rear Panel Headphone/Line-Out.

36

HP, LO Rear Panel Headphone/Line-Out.

39

HP, LO Front Panel Headphone/Line-Out.

41

HP, LO Front Panel Headphone/Line-Out.

The symbols used in this table are defined as: I = input, O = output, LI = line level input, LO = line level output, HP = output capable of driving

headphone load, MIC = input supports microphones with MIC bias and boost amplifier.

Rev. 0 | Page 10 of 20 | April 2008

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