psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 130

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

Data Sheet
The two main purposes of the programmable saturation amplification are:
• Level balancing of the filtered signal (avoidance of overload effects).
• Amplification up to + 12 dB followed by a saturation (3.14 dBm0) of the incoming
4.3.5
The generated tone signal can be amplified separate for transmit and receive direction
with the gain parameters GTX, GTR and switched to the transmit/receive channels by
setting TGSR.TRX (Tone Ringing Transmit) and TRR (Tone Ringing Receive).
Table 17 CRAM Parameters of the Tone Level Adjustment
Parameter
GTX
GTR
4.3.6
The DTMF mode of the tone generator is selected by setting the TGSR.DTMF to ’1’. The
trapezoid output signal of the signal generators (F3, G3) and (FD, GD3) are added and
fed in the transmit path. The CRAM parameters for the DTMF signals are listed in table
18
In the DTMF mode a special DTMF filter is switched to the transmit channel. Undesirable
frequency components are filtered by this special DTMF-low-pass filter to the following
limits:
Frequency Band
3400 – 4000 Hz
300 – 3400 Hz
signal. This saturation amplification converts a sine-wave signal into a square-wave
or a trapezoid signal where their edges are eliminated. This method produces
pleasant ringing tones.
0 – 300 Hz
Tone Level Adjustment
DTMF Mode
# of CRAM
Bytes
1
1
Min. Attenuation
33 dB
20 dB
33 dB
Range
0 dB to – 50 dB
(also –
0 dB to – 50 dB
(also –
dB)
dB)
120
Comment
Level adjustment in transmit direction
Level adjustment in receive direction
PSB 21391
PSB 21393
2001-03-07
Codec