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參數(shù)資料
| 型號： | AD1984JCPZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 消費家電 |
| 英文描述： | High Definition Audio SoundMAX Codec |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, QCC48 |
| 封裝： | 7 X 7 MM, LEAD FREE, MO-220VKKD-2, LFCSP-48 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 283K |
| 代理商： | AD1984JCPZ |
AD1984
Rev. 0
|
Page 11 of 20
|
January 2007
FILTER/REFERENCE
V
REF
_FILT
MIC_BIAS-B
MIC_BIAS-C
27
28
29
O
O
O
Voltage Reference Filter.
Switchable Microphone Bias. For use with Port B (Pins 21, 22).
Switchable Microphone Bias. For use with Port C (Pins 23, 24).
Both MIC bias pins are capable of Hi-Z, 0 V, 1.65 V, 3.7 V, and 3.9 V (with 5.0 V on
Pin 33), Hi-Z, 0 V, 1.65 V, 2.86 V, and 3.0 V (with 3.3 V on Pin 33).
CAUTION: DO NOT APPLY 3.3 V TO THIS PIN!
Filter connection for internal core voltage regulator. This pin must be connected to
filter caps: 10
μ
F, 1.0
μ
F, and 0.1
μ
F connected in parallel between Pin 1 and
D
VSS
(Pin 7).
DV
CORE
1
O
POWER AND GROUND
DV
IO
3.3V
DV
SS
DV
DD
3.3 V
3
7
9
I
I
I
Link Digital I/O Voltage Reference. 3.3 V
Digital supply return (ground).
Digital supply voltage 3.3 V . This is regulated down to DV
CORE
on Pin 1 to supply the
internal digital core internal to the AD1984.
CAUTION: DO NOT APPLY 5 V TO THESE PINS!
Analog supply voltage 3.3 V ONLY.
Note: AV
DD
supplies should be well regulated and filtered as supply noise degrades
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 AD1984 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
DD
) via a low-pass filter.
The AD1984 produces a mic bias voltage relative to the AV
DD
supply
(typically 3.0 V @ AV
DD
= 3.3 V).
Analog supply return (ground). AV
SS
should be connected to DV
SS
using a conductive
trace under, or close to, the AD1984.
AV
DD
3.3 V
25, 38
I
MIC_BIAS_IN
5.0 V or 3.3 V
33
I
AV
SS
26, 42
I
Table 3. AD1984 Pin Descriptions (Continued)
Mnemonic
Pin No.
I/O
Description
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.
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