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參數資料
型號: W681513
廠商: WINBOND ELECTRONICS CORP
元件分類: Codec
英文描述: 5V SINGLE-CHANNEL VOICEBAND CODEC FOR USB APPLICATIONS
中文描述: 5V單聲道聲帶編解碼器為USB應用
文件頁數: 8/33頁
文件大小: 382K
代理商: W681513
W681513
- 8 -
7. FUNCTIONAL DESCRIPTION
W681513 is a single-rail, single channel PCM CODEC for voiceband applications. The CODEC
complies with the specifications of the ITU-T G.712 recommendation. The CODEC also includes a
complete
μ
-Law and A-Law compander. The
μ
-Law and A-Law companders are designed to comply
with the specifications of the ITU-T G.711 recommendation.
The block diagram in section 3 shows the main components of the W681513. The chip consists of a
PCM interface, which can process long and short frame sync formats, as well as GCI and IDL formats.
The pre-scaler of the chip provides the internal clock signals and synchronizes the CODEC sample
rate with the external frame sync frequency. The power conditioning block provides the internal
power supply for the digital and the analog section, while the voltage reference block provides a
precision analog ground voltage for the analog signal processing. The main CODEC block diagram
is shown in section 3.
f
C
= 3400Hz
nFilter
1
Figure 7.1 The W681513 Signal Path
7.1. Transmit Path
The A-to-D path of the CODEC contains an analog input amplifier with externally configurable gain
setting (see application examples in section 11). The device has an input operational amplifier whose
output is the input to the encoder section. If the input amplifier is not required for operation it can be
powered down and bypassed. In that case a single ended input signal can be applied to the AO pin or
the AI- pin. The AO pin becomes high input impedance when the input amplifier is powered down. The
input amplifier can be powered down by connecting the AI+ pin to V
DD
or V
SS
. The AO pin is selected
as an input when AI+ is tied to V
DD
and the AI- pin is selected as an input when AI+ is tied to V
SS
(see
Table 7.1).
PAO+
PAO
8
μ
/A-
Cont
AI+
AI-
w
ol
AO
+
RO+
-
VA
G
Filter
H
Fn
i
Aliasing
f
C
PFilter
nFilter
2
μ
/A
Control
8
μ
/A-
Control
PAI
V
AG
Ant-Aliasing
Ant
High Pass
Smoothing
H
Receive Path
Transmit Path
+ -
+
+
+
-
A/D
Converter
D/A
Converter
f
C
=
C
= 200
f
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W681513_05 制造商:WINBOND 制造商全稱:Winbond 功能描述:5V SINGLE-CHANNEL VOICEBAND CODEC FOR USB APPLICATIONS
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