AD1882A 데이터 시트보기 (PDF) - Analog Devices

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AD1882A

High Definition Audio SoundMAX Codec

Analog Devices 

AD1882A

Table 6. AD1882A Pin Descriptions (Continued)

Mnemonic

Pin No. Function

Description

POWER AND GROUND

DVIO 3.3 V ± 10%

4

I

or

DVIO 1.5 V ± 5.5%

DVGPIO

3

I

DVSS

7

I

DVDD (3.3 V)

9

I

AVDD (3.3 V)

25, 38 I

Connect to the I/O Voltage Used for the HD Audio Controller Signals.

Connect to 3.3 V digital supply to power the GPIO and S/PDIF pins.

Digital Supply Return (Ground).

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

internal digital core internal to the AD1882A.

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

AVSS

33

I

26, 42 I

Source Power for Microphone Bias Circuitry. Connect this pin to 5.0 V via a low-pass

filter. When connected this way, the AD1882A is capable of providing 3.9 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.

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

conductive trace under, or close to, the AD1882A.

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 10 of 20 | August 2008

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