92hd005 Integrated Device Technology, 92hd005 Datasheet - Page 21

• Manufacturer Part Number: 92hd005
• Description: Four Channel Hd Audio Codec
• Manufacturer: Integrated Device Technology

IDT™
4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
92HD005/92HD005D
4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE
For different analog supply voltages, Table 3 summarizes what ports can be detected and the resis-
tor tolerance needed.
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 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.
Bins
000b
001b
010b
100b
101b
011b
110b
111b
AVdd Nominal Voltage
Return Hex Code
(+/- 5%)
4.5 V
3.3 V
5 V
4 V
Impedance Sense
012Ch
07D0h
0BB8h
028Ah
03E8h
0064h
2710h
2710h
Resistor Tolerance
1275 Ω > Impedance < 2000 Ω
(If port D is used)
300 Ω > Impedance < 1275 Ω
Impedance = 1275 Ω +/- 25%
Impedance = 2000 Ω +/- 25%
Measured Impedance Level
Impedance = 300 Ω +/- 25%
Sense A
Impedance < 300 Ω
0.50%
0.10%
Table 4. Impedance Sense
1%
1%
21
Table 3. Jack Detect
> 2000 Ω
> 2000 Ω
(If port D is not used)
Resistor Tolerance
Sense A
1%
1%
1%
1%
92HD005/92HD005D
Passive Speakers, Headset Speakers
Amplified Speakers, Line In
Amplified Speakers, Line In
General Device Detected
Some Headset Speakers
Some Microphones
Amplified Speakers
Microphones
Microphones
Resistor Tolerance
(For ports E and F)
Sense B
1%
1%
1%
1%
PC AUDIO
V 1.1 4/08