PEB2465 SIEMENS [Siemens Semiconductor Group], PEB2465 Datasheet - Page 14

• Manufacturer Part Number: PEB2465
• Description: Four Channel Codec Filter
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Semiconductor Group
2
2.1
The change from 2 m to 1 m CMOS process requires new concepts in the realization
of the analog functions. High performance (in the terms of gain, speed, stability ) 1 m
CMOS devices can not withstand more than 5.5 V of supply-voltage. On that account the
negative supply voltage
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 m CMOS does not only lend to problems
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
function seems to be a must for an adequate four channel architecture.
Figure 2
SICOFI
®
Functional Description
SICOFI
-4 Signal Flow Graph (for either channel)
®
-4 Principles
V
SS
of the previous SICOFI
14
®
and the SICOFI
®
it is the only acceptable solution in
s will be omitted. This is a benefit
Functional Description
®
-2-approach) for this
PEB 2465
02.97