PEB3265 Infineon Technologies Corporation, PEB3265 Datasheet - Page 117

• Manufacturer Part Number: PEB3265
• Description: (PEB326x / PEB426x) Dual Channel Slicofi-2 / Slic Duslic
• Manufacturer: Infineon Technologies Corporation

Preliminary
4.8.2.6
The AC levelmeter is selected and enabled as shown in
Table 32
LM-SEL[3:0] in
register LMCR2
0000
0110
0111
Figure 45
levelmeter allows access to the voice signal while the active voice signal is being
processed. The input signal for the AC levelmeter might get processed with a
programmable filter characteristic, i.e. bandpass- or notch filter. Depending on the
following settings, the bandpass or notch filter is turned on or off:
– Register LMCR2 bit LM-FILT = 0: No filter enabled (normal operation)
– Register LMCR2 bit LM-FILT = 1: Bandpass/notch filter characteristics enabled
– Register LMCR2 bit LM-NOTCH = 0: Notch filter enabled, bandpass filter disabled
– Register LMCR2 bit LM-NOTCH = 1: Bandpass filter enabled, notch filter disabled
The rectifier cannot be turned off, it is always active in the AC path. A shift-factor in front
of the integrator prevents the levelmeter during an integration operation to create an
overflow. The shift-factor can be set by the coefficient LM-AC gain (see CRAM
coefficient set
K
CRAM:
Address
LM-AC is a 4 bit nibble which contains K
CG1 is a 4 bit nibble which is calculated by DuSLICOS and controls the conference gain
(see DuSLICOS byte file). To ensure that CG1 is not changed please perform a read/
modify/write operation.
Data Sheet
V
V
INTAC
Peak
RMS
=
=
can be set via coefficient LM-AC:
V
---------------
---------------------------- -
V
on
AC Levelmeter
Peak
0x34: CG1/LM-AC
Mean
2
Selecting AC Levelmeter Path
Page 109
Table 51 "CRAM Coefficients" on Page
2
AC Levelmeter Path
AC levelmeter in transmit
AC levelmeter in receive
AC levelmeter receive + transmit
shows the path of the AC/TTX levelmeter functions. The AC
INTAC.
117
Table
226).
Operational Description
32:
2000-07-14
DuSLIC