AD1988B 데이터 시트보기 (PDF) - Analog Devices

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AD1988B

High Definition Audio SoundMAX® Codec

Analog Devices 

AD1988A/AD1988B

JACK PRESENCE DETECTION

HD AUDIO STYLE JACK PRESENCE DETECTION

The AD1988 uses two jack sense pins for presence detection on

up to eight audio jacks. This, combined with the device identifi-

cation engine, enables software to determine if there is a device

plugged into the circuit, and the type of device it is. Allowing

software to configure jacks and amplifiers, as necessary, ensures

proper audio operation.

Detect jack presence by using a resistor tree arrangement

detailed by the HD audio specification, allowing up to four

jacks per sense line. Jacks must have normally open, isolated

switches to use this method of jack presence detection.

For proper operation, there must be a 2.67 kΩ 1% resistor

connected between SENSE_A and AVDD, and another 2.67 kΩ

1% resistor between SENSE_B and AVDD.

The specific resistor values for each jack are listed in Table 16.

Use 1% tolerance resistors to ensure accurate detection.

Table 16. Jack Sense Mapping

Resistor Value

(1% Tolerance)

Name

2.67 kΩ

Pull-up to AVDD

5.10 kΩ

FRONT

10.0 kΩ

LINE IN

20.0 kΩ

FRONT_MIC

39.2 kΩ

HP_OUT

SENSE_A

Port

D

C

B

A

Node ID

0x12

0x15

0x14

0x11

Name

Pull-up to AVDD

SURR_SIDE (7.1)

C/LFE

SURR_BACK (5.1)

REAR_MIC

SENSE_B

Port

H

G

F

E

Node ID

0x25

0x24

0x16

0x17

Rev. 0 | Page 18 of 20

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