92HD005 Datasheet, PDF (21/205 Pages) Integrated Device Technology – 4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE

92HD005/92HD005D
4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
PC AUDIO
For different analog supply voltages, Table 3 summarizes what ports can be detected and the resis-
tor tolerance needed.
Table 3. Jack Detect
AVdd Nominal Voltage
(+/- 5%)
5V
4.5 V
4V
3.3 V
Resistor Tolerance
Sense A
(If port D is used)
1%
1%
0.50%
0.10%
Resistor Tolerance
Sense A
(If port D is not used)
1%
1%
1%
1%
Resistor Tolerance
Sense B
(For ports E and F)
1%
1%
1%
1%
Includes pull-up resistors on Sense A/B and series resistors between jack switch and Sense A/B.
See the reference design for more information on Jack Detect implementation.
1.3.8.2. Impedance Sense
Impedance Sensing is accomplished by on-chip circuitry that tests the impedance at the pin of the
chip and compares it to internal reference impedance. Table 4 describes the bin information and the
codes that are returned when the Pin Widget Impedance field in the Port Pin Sense widget is read.
Please note that even under the best conditions, there is no method to guarantee 100% impedance
sensing due to variations in external circuitry and impedance overlap of devices that can be plugged
into a jack. The impedance sense table reflects both standard Line Out and Headphone output driv-
ers.
Table 4. Impedance Sense
Bins Return Hex Code
000b
0064h
001b
012Ch
010b
028Ah
011b
03E8h
100b
07D0h
101b
0BB8h
Measured Impedance Level
Impedance < 300 Ω
Impedance = 300 Ω +/- 25%
300 Ω > Impedance < 1275 Ω
Impedance = 1275 Ω +/- 25%
1275 Ω > Impedance < 2000 Ω
Impedance = 2000 Ω +/- 25%
General Device Detected
Passive Speakers, Headset Speakers
Some Headset Speakers
Some Microphones
Microphones
Microphones
Amplified Speakers
110b
2710h
> 2000 Ω
Amplified Speakers, Line In
111b
2710h
> 2000 Ω
Amplified Speakers, Line In
IDT™
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4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
92HD005/92HD005D
V 1.0 12/06