92HD71B7 Datasheet, PDF (13/216 Pages) Integrated Device Technology – 4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER

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