PEB2466-HV1.2 Ver la hoja de datos (PDF) - Infineon Technologies

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PEB2466-HV1.2

Four Channel Codec Filter with PCM- and µ-Controller Interface SICOFI®4-µC

Infineon Technologies 

PEB 2466

Functional Description

2

Functional Description

2.1 SICOFI®-4-µC 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 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 µm 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.

Figure 2

SICOFI®-4 µC Signal Flow Graph (for any channel)

Semiconductor Group

15

02.97

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