PSB2163T-V31TR Infineon Technologies, PSB2163T-V31TR Datasheet - Page 164

• Manufacturer Part Number: PSB2163T-V31TR
• Description: IC AUDIO RINGING CODEC 28-PDSO
• Manufacturer: Infineon Technologies
• Series: ARCOFI®r

Specifications of PSB2163T-V31TR

• Function: CODEC Filter
• Interface: IOM-2, PCI, Serial
• Number Of Circuits: 1
• Voltage - Supply: 5V
• Current - Supply: 900µA
• Power (watts): 1mW
• Operating Temperature: -25°C ~ 80°C
• Mounting Type: Surface Mount
• Package / Case: DSO-28
• Includes: Activation and Deactivation, B-Channel and D-Channel HDLC Controllers, D-Channel Priority Handler, Monitor Channel Handler
• Lead Free Status / RoHS Status: Request inventory verification / Request inventory verification
• Other names: PSB2163T-V31INTR; PSB2163T-V31TR

3.7
The telephone user normally has the possibility to choose different volume settings when
using the speakerphone. The volume can be adjusted either manually by
reprogramming amplifications in the receive path or by means of the automatic gain
control stage. Since the automatic gain control stages are described in a separate
application note, this chapter deals with the first solution.
Table 9
Example for Eight Volume Steps
Vol. Step
total gain G
[dB]
ALS [dB]
GR [dB]
LGAR [dB]
GAE [dB]
ATT [dB]
It’s important to keep some items in mind:
• In speakerphone mode, receive amplification can be changed with LGAR, GR, and
• For achieving best signal to noise performance, the maximum signal level should be
• It’s advisable, not to reduce the loop gain (which includes the switchable attenuation
• Every time, either ARCR.LSC, ATCR.MIC, or GX is changed, GAE must be adapted
Table 9 shows an example for eight volume steps with an over-all amplification in the
loudest volume step (step 8) of 23dB. For each volume step, the amplification is reduced
by 3dB. The value for GAE is shown as "Y" and must be reduced every time, the gain in
the ALS is reduced. The loop gain remains constant:
LGAR+GR+ARCR.LSC+ATCR.MIC+GX+LGAX+ATT = const.
1
Semiconductor Group
ARCR.LSC.
close to the max. PCM value; clipping must be avoided.
ATT) when reducing the volume
parameter ATT; as a consequence, the conversation gets the more transparent, the
lower the volume is.
too (applies only for speakerphone mode); see also figure 14.
A. Busla: "Fundamental Considerations in the Design of a Voice-Switched Speakerphone", The
Bell System Technical Journal; Vol. XXXIX, March 1969, Number 2, page 280
Implementing a Volume Control
8
G=
23
11.5
3.5
8
Y
X
7
G-3=
20
8.5
3.5
8
Y-3
X-3
6
G-6=
17
5.5
3.5
8
Y-6
X-6
1)
; this can be achieved by reprogramming the
163
5
G-9=
14
2.5
3.5
8
Y-9
X-9
Speakerphone Implementation
4
G-12=
11
2.5
0.5
8
Y-9
X-12
3
G-15=
8
2.5
0
5.5
Y-9
X-15
2
G-18=
5
2.5
0
2.5
Y-9
X-18
1
G-21=
2
2.5
-0.5
0
Y-9
X-21