AD1984AJCPZ 데이터 시트보기 (PDF) - Analog Devices
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AD1984AJCPZ Datasheet PDF : 20 Pages
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AD1984A
Table 4. Pin Function Descriptions (Continued)
Mnemonic
Pin No.
I/O
Description
FILTER/MIC_BIAS
VREF _FILT
MIC_BIAS-B
MIC_BIAS-C
MIC_BIAS_IN
5.0 V or 3.3 V
27
O
Voltage Reference Filter.
28
O
Switchable Microphone Bias. For use with Port B (Pins 21, 22).
29
O
Switchable Microphone Bias. For use with Port C (Pins 23, 24).
Both MIC bias pins are capable of high-Z, 0 V, 1.65 V, 3.7 V, and 3.9 V (with 5.0 V on
Pin 33), high-Z, 0 V, 1.65 V, 2.86 V, and 3.0 V (with 3.3 V on Pin 33).
33
I
Source Power for Microphone Bias Boost Circuitry.
Connect this pin to 5.0 V via a low-pass filter. When connected this way the AD1984A
is capable of providing 3.9 V as a mic bias to all of the mic bias pins (except on Pin 31).
POWER AND GROUND
If 5 V is not available, connect this pin to 3.3 V (AVDD) via a low-pass filter.
DVCORE 1.7 V to 1.9 V or 1
FILTER
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 3.3V DVDD, this pin must be connected to filter caps: 10μF,
1.0 μF, and 0.1 μF connected in parallel between Pin 1 and DVSS (pin 7). Direct, filtered
1.7 V to 1.9 V DVDD may be applied to Pin 1 to lower the digital power requirements.
Pin 9 MUST be connected to Pin 1 in this case.
DVIO 1.5 V or 3.3 V
3
DVSS
7
DVDD 1.7 V to 1.9 V or 3.3 V 9
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 AD1984A. Direct, filtered 1.7 V to 1.9 V
DVDD may be applied to Pin 1 to lower the digital power requirements. Pin 9 MUST be
connected to Pin 1 in this case.
AVDD 3.3 V
25, 38
I
CAUTION: DO NOT APPLY 5 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.
AVSS
26, 42
I
Analog Supply Return (Ground). AVSS should be connected to DVSS using a
conductive trace under, or close to, the AD1984A.
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 | April 2008
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