AD1987 데이터 시트보기 (PDF) - Analog Devices

부품명

상세내역

일치하는 목록

AD1987

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

Digital Supply I/O. Connect to the I/O voltage used for the HD audio controller

signals.

DVSS

DVDD 3.3 V ±10%

4, 7

I

9

I

Digital Supply Return (Ground).

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

digital core.

AVDD 3.3 V ±5%

25, 38 I

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

E 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.

T 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

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

Rev. A | Page 11 of 20 | March 2008

Share Link: