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參數資料
型號: w681511
廠商: WINBOND ELECTRONICS CORP
元件分類: Codec
英文描述: SINGLE-CHANNEL VOICEBAND CODEC
中文描述: 單通道聲帶編解碼器
文件頁數: 8/34頁
文件大小: 406K
代理商: W681511
W681511
- 8 -
7. FUNCTIONAL DESCRIPTION
W681511 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 W681511. 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 W681511 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
相關PDF資料
PDF描述
W681512 SINGLE-CHANNEL VOICEBAND CODEC
W681512R SINGLE-CHANNEL VOICEBAND CODEC
W681512RG SINGLE-CHANNEL VOICEBAND CODEC
W681512S SINGLE-CHANNEL VOICEBAND CODEC
W681512SG SINGLE-CHANNEL VOICEBAND CODEC
相關代理商/技術參數
參數描述
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W681511IS 制造商:WINBOND 制造商全稱:Winbond 功能描述:SINGLE-CHANNEL VOICEBAND CODEC
W681511S 功能描述:IC VOICEBAND CODEC 5V 1CH 20SOP RoHS:否 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標準包裝:2,500 系列:- 類型:立體聲音頻 數據接口:串行 分辨率(位):18 b ADC / DAC 數量:2 / 2 三角積分調變:是 S/N 比,標準 ADC / DAC (db):81.5 / 88 動態范圍,標準 ADC / DAC (db):82 / 87.5 電壓 - 電源,模擬:2.6 V ~ 3.3 V 電壓 - 電源,數字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應商設備封裝:48-TQFN-EP(7x7) 包裝:帶卷 (TR)
W681511SG 功能描述:IC VOICEBAND CODEC 5V 1CH 20SOP RoHS:是 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標準包裝:2,500 系列:- 類型:立體聲音頻 數據接口:串行 分辨率(位):18 b ADC / DAC 數量:2 / 2 三角積分調變:是 S/N 比,標準 ADC / DAC (db):81.5 / 88 動態范圍,標準 ADC / DAC (db):82 / 87.5 電壓 - 電源,模擬:2.6 V ~ 3.3 V 電壓 - 電源,數字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應商設備封裝:48-TQFN-EP(7x7) 包裝:帶卷 (TR)