AD1884A View Datasheet(PDF) - Analog Devices

Part Name

Description

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AD1884A

High Definition Audio SoundMAX® Codec

Analog Devices 

AD1884A

Table 4. Pin Function Descriptions (Continued)

Mnemonic

Pin No.

I/O

Description

POWER AND GROUND

DVCORE 1.7 V to 1.9 V or 1

FILTER

DVIO 1.5 V or 3.3 V

3

DVSS

7

DVDD 1.7 V to 1.9 V or 3.3 V 9

AVDD 3.3 V

AVSS

25, 38

26, 42

I/O

CAUTION: DO NOT APPLY 3.3 V TO THIS PIN! Filter connection for internal core

voltage regulator.

If Pin 9 is connected to 3.3 V DVDD, this pin must be connected to filter caps: 10 μF,

1.0 μF, and 0.1μF connected in parallel between Pin 1 and DVSS (Pin 7). Direct, filtered

1.7 V to 1.9 V DVDD can be applied to Pin 1 to lower the digital power requirements.

Pin 9 MUST be connected to Pin 1 in this case.

I

Link Digital I/O Voltage Reference. 3.3 V ± 10% or 1.5 V ± 5.5%

I

Digital Supply Return (Ground).

I

Digital Supply Voltage 3.3 V ± 10%. This is regulated down to DVCORE on Pin 1 to

supply the internal digital core internal to the AD1884A. Direct, filtered 1.7 V to 1.9 V

DVDD can be applied to Pin 1 to lower the digital power requirements. Pin 9 MUST be

connected to Pin 1 in this case.

I

CAUTION: DO NOT APPLY 5 V TO THESE PINS! Analog Supply Voltage 3.3 V ± 5%.

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

audio performance.

I

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

conductive trace under, or close to, the AD1884A.

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.

Rev. 0 | Page 11 of 20 | March 2008

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