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參數資料
型號: W681360YG
廠商: WINBOND ELECTRONICS CORP
元件分類: 編解碼器
英文描述: 3V SINGLE-CHANNEL 13-BIT LINEAR VOICE-BAND CODEC
中文描述: MU-LAW, LINEAR CODEC, PQCC32
封裝: ROHS COMPLIANT, QFN-32
文件頁數: 11/34頁
文件大小: 348K
代理商: W681360YG
W681360
Publication Release Date: September 2005
- 11 -
Revision A.2
7.2.1. Receive Gain Adjust Mode
The W681360 can be put in the receive path adjust mode by applying a logic “1” to the BCLKR pin
while all other clocks are clocked normally. The device is then in a position to read 16-bits of data,
with three additional coefficient bits an addend to the 13-bit digital voice data. These three coefficients
are used to program a receive path attenuation, thereby allowing the receive signal to be attenuated
according to the values in the following table. If the feature is not used the default value is 0dB.
TABLE 7.2: ATTENUATION COEFFICIENT RELATIONSHIP IN RECEIVE GAIN ADJUST MODE
Coefficient
Attenuation (dB)
000
0
001
3
010
6
011
9
100
12
101
15
110
18
111
21
7.3.
P
OWER
M
ANAGEMENT
7.3.1. Analog and Digital Supply
The power supply for the analog and digital parts of the W681360 must be 2.7V to 5.25V. This supply
voltage is connected to the V
DD
pin. The V
DD
pin needs to be decoupled to ground through a 0.1
μ
F
ceramic capacitor.
7.3.2. Analog Ground Reference Bypass
The system has an internal precision voltage reference which generates the V
DD
/2 mid-supply analog
ground voltage. This voltage needs to be decoupled to V
SS
at the V
REF
pin through a 0.1
μ
F ceramic
capacitor.
7.3.3. Analog Ground Reference Voltage Output
The analog ground reference voltage is available for external reference at the V
AG
pin. This voltage
needs to be decoupled to V
SS
through a 0.01
μ
F ceramic capacitor. The analog ground reference
voltage is generated from the voltage on the V
REF
pin and is also used for the internal signal
processing.
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