AD1987(Rev0) 데이터 시트보기 (PDF) - Analog Devices

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AD1987
(Rev.:Rev0)

High Definition Audio SoundMAX Codec

Analog Devices 

AD1987

Table 5. AD1987 Pin Descriptions (Continued)

Mnemonic

Pin No. Function

Description

POWER AND GROUND

DVIO 3.3 V ±10%

3

I

DVSS

DVDD 3.3 V ±10%

4, 7

I

9

I

AVDD 3.3 V ±5%

25, 38 I

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 boost circuitry.

Connect this pin to 5.0 V via a low-pass filter. When connected this way the AD1987 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

AD1987 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 AD1987.

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 18 | May 2007

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