ad1884 Analog Devices, Inc., ad1884 Datasheet - Page 11

• Manufacturer Part Number: ad1884
• Description: High Definition Audio Soundmax Codec
• Manufacturer: Analog Devices, Inc.

Table 3. AD1884 Pin Descriptions (Continued)
Mnemonic
AV
MIC_BIAS_IN
5.0 V or 3.3 V
AV
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.
DD
SS
3.3 V
Pin No.
25, 38
33
26, 42
I/O
I
I
I
Rev. 0 | Page 11 of 16 | January 2007
Description
CAUTION: DO NOT APPLY 5 V TO THESE PINS!
Analog Supply Voltage 3.3 V ONLY.
Note: AV
audio performance.
Source Power for Microphone Bias Boost Circuitry.
Connect this pin to 5.0 V via a low-pass filter. When connected this way the AD1884 is
capable of providing +3.9 V as a mic bias to all of the mic bias pins (except on
Pin 31).
If 5 V is not available, connect this pin to +3.3 V (AV
The AD1884 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 AD1884.
DD
supplies should be well regulated and filtered as supply noise degrades
DD
= 3.3 V).
SS
should be connected to DV
DD
) via a low-pass filter.
DD
supply
SS
using a
AD1884