參數(shù)資料
型號: PEB2466-HV1.2
廠商: SIEMENS A G
元件分類: 編解碼器
英文描述: Four Channel Codec Filter with PCM- and m-Controller Interface SICOFI4-mC
中文描述: A/MU-LAW, PCM CODEC, PQFP64
文件頁數(shù): 15/82頁
文件大?。?/td> 3330K
代理商: PEB2466-HV1.2
PEB 2466
Functional Description
Semiconductor Group
15
02.97
2
Functional Description
2.1
The change from 2
μ
m to 1
μ
m CMOS process requires new concepts in the realization
of the analog functions. High performance (in the terms of gain, speed, stability …) 1
μ
m
CMOS devices cannot withstand more than 5.5 V of supply-voltage. On that account the
negative supply voltage VSS of the previous SICOFIs is omitted. This is a benefit for the
user but it makes a very high demand on the analog circuitry.
ADC and DAC are changed to Sigma-Delta-concepts to fulfill the stringent requirements
on the dynamic parameters.
Using 1
μ
m CMOS does not only lead to problems - it is the only acceptable solution in
terms of area and power consumption for the integration of more than two SICOFI
channels on a single chip.
It is rather pointless to implement 4 codec-filter-channels on one chip with pure analog
circuitry. The use of a DSP-concept (the SICOFI and the SICOFI-2-approach) for this
function is a must for an adequate four channel architecture.
SICOFI
-4-
μ
C Principles
Figure 2
SICOFI
-4
μ
C Signal Flow Graph (for any channel)
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