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92HD71B5

4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER

Integrated Device Technology 

92HD71B7

4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER

PC AUDIO

Output ports are always on to prevent pops/clicks associated with charging and discharging output

coupling capacitors. This maintains proper bias on output coupling caps even in D3 as long as AVDD

is available. Unused ports should be left unconnected. When updating existing designs to use

92HD71B7, ensure that there are no conflicts between the output ports on 92HD71B7 and existing

circuitry.

AFG Power

State

D0-D2

D3

Table 1. Analog Output Port Behavior

Output Enable

1

1

0

-

Mute

0

1

-

-

Port Behavior

Active - audio enabled

Active - audio mute. Port drives silence

Inactive -port is powered on (low output impedance)

but drives silence only.

Inactive (lower power) - Port keeps output coupling

caps charged and has low output impedance (not

necessarily the same as in D0) but consumes less

power.

1.4.4.

Jack Detect

Plugs inserted to a jack on Ports A, B, C, & D are detected using SENSE_A. Plugs inserted to a jack

on Ports E & F are detected using SENSE_B. The following table summarizes the proper resistor tol-

erances for different analog supply voltages.

Table 2. Jack Detect

AVdd Nominal

Voltage (+/- 5%)

5V

4.75V

4V

3.3V

Resistor Tolerance

Pull-Up

Resistor Tolerance

SENSE_A

(If port D is used)

1%

1%

1%

1%

0.50%

0.50%

0.10%

0.10%

Resistor Tolerance

SENSE_A

(If port D is not used)

1%

1%

1%

1%

Resistor Tolerance

SENSE_B

1%

1%

1%

1%

See reference design for more information on Jack Detect implementation.

1.4.5.

SPDIF Output

All SPDIF Outputs can operate at 44.1kHz, 48kHz, 88.2kHz, 96kHz and 192KHz as defined in the

Intel High Definition Audio Specification with resolutions up to 24 bits. This insures compatibility with

all consumer audio gear and allows for convenient integration into home theater systems and media

center PCs.

A second independant SPDIF Output is provided as an option for WLP compliant HDMI and SPDIF

outputs. Its function is identical to the primary SPDIF output.

IDT™ CONFIDENTIAL AND PROPRIETARY

13

4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER

92HD71B7

V 0.9 07/07

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