PEB2465H 데이터 시트보기 (PDF) - Infineon Technologies

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PEB2465H

4-channel codec filter

Infineon Technologies 

2

Functional Description

SICOFI-4

PEB 2465

Functional Description

2.1

SICOFI-4 Principles

The change from 2 µm to 1 µm CMOS process requires new concepts in the realization

of the analog functions. High performance (in the terms of gain, speed, stability…) 1 µm

CMOS devices can not withstand more than 5.5 V of supply-voltage. On that account the

negative supply voltage VSS of the previous SICOFI®s will be 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 µm CMOS does not only lend to problems − it is the only acceptable solution in

terms of area and power consumption for the integration of more then 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 seems to be a must for an adequate four channel architecture.

Figure 2 SICOFI-4 Signal Flow Graph (for either channel)

Data Sheet

16

2000-02-08

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