PSB21373HV1.1XT Infineon Technologies, PSB21373HV1.1XT Datasheet - Page 135

• Manufacturer Part Number: PSB21373HV1.1XT
• Manufacturer: Infineon Technologies

Specifications of PSB21373HV1.1XT

• Lead Free Status / RoHS Status: Compliant

Data Sheet
Description of the programmable parameters:
Parameter # of CRAM
LGAX
COMX
AAX
AGX
AGIX
TMLX
TMHX
NOISX
4.4.5
The Automatic Gain Control of the receive direction AGCR (see figure Chapter 70) is
similar to the transmit AGC. One additional parameter (AAR) offers more flexibility since
the AGCR is able to attenuate signals as well. Depending on the parameters AAR and
AGR different behaviours of the AGCR are possible as figure Chapter 71 illustrates. For
example with AGR set to 0dB and AAR set to maximum (-48 dB) the AGCR acts as a
limiter.
The AGCR is working only together with the speakerphone function (GCR.SP=1). The
digital gain stage LGAR is always enabled in speakerphone mode, independent of the
setting of GCR.AGCR.
It is highly recommended to program reasonable amplifications in the digital gain stages.
Otherwise the ASP will run into saturation above the 3.14 dB PCM-value.
Note that the speech detector for the receive direction is supplied with the signal that
comes out of the AGR-block unless XCR.PGCR = ’1’.
Automatic Gain Control of the Receive Direction (AGCR)
Bytes
1
1
1
1
1
1
1
1
Range
– 12 to 12 dB
0 to – 73 dB
0 to 47 dB
0 to 18 dB
0 to 18 dB
1 to 2700 ms/dB
1 to 340 ms/dB
0 to – 95 dB
135
Comment
Loudness Gain Adjustment
Compare level rel. to max. PCM-value
Attenuation range of Automatic Control
Gain range of Automatic control
Initial AGC gain transmit
Settling time constant for lower levels
Settling time constant for higher levels
Threshold for AGC-reduction
by background noise
PSB 21373
2002-05-13