w681360 Winbond Electronics Corp America, w681360 Datasheet - Page 11

• Manufacturer Part Number: w681360
• Description: 3v Single-channel 13-bit Linear Voice-band Codec
• Manufacturer: Winbond Electronics Corp America

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.
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
ceramic capacitor.
The system has an internal precision voltage reference which generates the V
ground voltage. This voltage needs to be decoupled to V
capacitor.
The analog ground reference voltage is available for external reference at the V
needs to be decoupled to V
voltage is generated from the voltage on the V
processing.
TABLE 7.2: ATTENUATION COEFFICIENT RELATIONSHIP IN RECEIVE GAIN ADJUST MODE
7.3. P
7.2.1. Receive Gain Adjust Mode
7.3.1. Analog and Digital Supply
7.3.2. Analog Ground Reference Bypass
7.3.3. Analog Ground Reference Voltage Output
OWER
M
ANAGEMENT
Coefficient
SS
DD
000
001
010
011
100
101
110
111
through a 0.01 μF ceramic capacitor. The analog ground reference
pin. The V
DD
pin needs to be decoupled to ground through a 0.1 μF
REF
- 11 -
pin and is also used for the internal signal
Attenuation (dB)
SS
at the V
12
15
18
21
0
3
6
9
Publication Release Date: September 2005
REF
pin through a 0.1 μF ceramic
DD
AG
/2 mid-supply analog
pin. This voltage
W681360
Revision A.2