AD1983 데이터 시트보기 (PDF) - Analog Devices

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AD1983

HD Audio SoundMAX® Codec

Analog Devices 

AD1983

JACK PRESENCE DETECTION

The AD1983 uses one jack sense line for presence detection on

up to four external jacks. This enables software to determine if

there is a device plugged into a jack; then, the AD1983 sensing

engine can determine what type of device it is. Jack presence is

detected using a resistor tree arrangement outlined in the HD

Audio specification. Up to four jacks can be sensed on a single

sense line by using a different value resistor for each between

the sense line and ground (AVSS). 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. For this configuration

R1 and C1 should be installed; R2 should not be installed

(see Figure 3).

The specific resistor values for each jack are shown in Table 13.

To ensure accurate detection, use 1% tolerance resistors for all

jack presence circuitry.

Table 13. Jack Sense Mapping

SENSE_A

Resistor (1%)

Name

Port

5.1 kΩ

Line Out

D

10.0 kΩ

Line In

C

20.0 kΩ

Microphone

B

39.2 kΩ

Headphone Out

A

Node ID

(Hex)

05

09

08

06

An alternate method reduces the current for sensing by

connecting a single 2.67 kΩ 1% resistor between the SENSE_A

and SENSE_SRC pins. For this configuration R1 and C1 are not

installed; however, R2 is installed (see Figure 3).

It is recommended that designers place circuitry for both

sensing methods and only install one of the two options.

AD1983

AVDD

AVDD

22, 26

9

SENSE_A/SRC_B

21

SENSE_SRC

R1

2.67kΩ, 1%, 1/8W

TO JACKS FOR

R2 (DNE)

2.67kΩ, 1%, 1/8W

C1 PORT A THROUGH PORT D

1µF

17, 29

AVSS

Figure 3. Jack Presence Detection

Rev. 0 | Page 14 of 16

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