AD1989B 데이터 시트보기 (PDF) - Analog Devices

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AD1989B

High Definition Audio SoundMAX Codec

Analog Devices 

AD1989B

Table 4. Pin Function Descriptions (Continued)

Mnemonic

Pin No. Function

Description

POWER AND GROUND

DVGPIO 3.3 V ± 10%

3

I

DVIO 3.3 V ± 10%

4

I

or

DVIO 1.5 V ± 5.5%

DVSS

7

I

DVDD 3.3 V ± 10%

9

I

AVDD 3.3 V ± 5%

25, 38 I

GPIO and S/PDIF Out (1 and 2) Signal Level (independent of DVIO). Connect to 3.3 V

±10%.

Connect to the I/O voltage used for the HD Audio controller signals.

Digital Supply Return (Ground).

Digital Supply Voltage 3.3 V. This is regulated down to Pin 1 to supply the internal

digital core.

CAUTION: DO NOT APPLY 5.0 V TO THESE PINS!

Analog Supply Voltage 3.3 V ONLY.

Note: AVDD supplies should be well regulated and filtered as supply noise degrades

audio performance.

MIC_BIAS_IN

33

I

AVSS

26, 42 I

Source for Microphone Bias Circuitry.

Connect this pin to 5.0 V via a low-pass filter. When connected this way the AD1989B

is capable of providing +3.95 V as a mic bias to all of the MIC_BIAS pins.

If 5 V is not available, connect this pin to +3.3 V (AVDD) via a low-pass filter. The

AD1989B produces a mic bias voltage relative to the AVDD supply

(typically 3.0 V @ AVDD = 3.3 V).

Analog Supply Return (Ground). AVSS should be connected to DVSS using a

conductive trace under, or close to, the AD1989B.

The symbols used in this table are defined as: I = input, O = output, LI = line level input, LO = line level output, HP = output capable of driving

headphone load, MIC = input supports microphones with MIC bias and boost amplifier, SWAP = outputs can swap L/R channels (typically used

to support C/LFE or shared C/LFE function).

Rev. 0 | Page 11 of 20 | August 2008

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