92HD005 데이터 시트보기 (PDF) - Integrated Device Technology

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92HD005

4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE

Integrated Device Technology 

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™

21

4-CHANNEL HD AUDIO CODEC WITH QUAD DIGITAL MICROPHONE INTERFACE

92HD005/92HD005D

V 1.0 12/06

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