psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 122

• Manufacturer Part Number: psb21391
• Description: Siemens Codec With Upn Transceiver
• Manufacturer: Infineon Technologies Corporation

Data Sheet
The GR-gain adjustment stage is digitally programmable from – 6 to 0 dB in steps
CRAM to set GR to the desired value. After reset, the GR-gain stage is bypassed.
A low-pass filter limits the signal bandwidth in the receive direction according to ITU-T
and ETSI (NET33) recommendations.
A series of low-pass interpolation filters increases the sampling frequency up to the
desired value. The last interpolator feeds the D/A-converter.
Figure 63
Architecture of the FX- and FR-Correction Filter
0.25 dB (–
dB and others are also possible). Respectively two bytes are coded in the
Equalizer 1
Equalizer 2
112
High- / Low- Pass
PSB 21391
PSB 21393
ITD02288
2001-03-07
Codec