ad1989a Conexant Systems, Inc., ad1989a Datasheet - Page 19

• Manufacturer Part Number: ad1989a
• Description: Ad1989a High Definition Audio Soundmax Codec
• Manufacturer: Conexant Systems, Inc.

AD1989A Data Sheet
Table 10.
DSH-202088A
3/2/09
GENERAL NOTES:
1. The symbols used in this table are defined as follows:
DV
DV
DV
DV
DV
AV
MIC_BIAS_IN
AV
or
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).
DD
SS
GPIO
IO
IO
SS
DD
Mnemonic
3.3 V ± 10%
1.5 V ± 5.5%
3.3 V ± 5%
3.3 V ± 10%
3.3 V ± 10%
Pin Descriptions (3 of 3)
Pin No.
3
4
7
9
25, 38
33
26, 42
I
I
I
I
I
I
I
Function
GPIO and S/PDIF Out (1 and 2) Signal Level (independent of DV
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: AV
audio performance.
Source for Microphone Bias Circuitry.
Connect this pin to 5.0 V via a low-pass filter. When connected this way the
AD1989A 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 (AV
AD1989A produces a mic bias voltage relative to the AV
(typically 3.0 V @ AV
Analog Supply Return (Ground). AV
conductive trace under, or close to, the AD1989A.
Power and Ground
Conexant
DD
supplies should be well regulated and filtered as supply noise degrades
DD
= 3.3 V).
Description
SS
should be connected to DV
High Definition Audio SoundMAX Codec
DD
) via a low-pass filter. The
DD
supply
IO
SS
). Connect to
using a
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