PSB21384HV1.3 Infineon Technologies, PSB21384HV1.3 Datasheet - Page 142

• Manufacturer Part Number: PSB21384HV1.3
• Description: Telecom ICs AMuLaw/Speech CODEC w/ ST Transceiver
• Manufacturer: Infineon Technologies

Specifications of PSB21384HV1.3

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Data Sheet
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 20 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
21
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
The pre-emphasis of 2 dB between the high and the low DTMF-frequency groups has to
be set with the independent gain parameters (G3 and GD3 resp.) of the trapezoid
generators . All generated DTMF-frequencies are guaranteed within a
300 – 3400 Hz
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)
132
Comment
Level adjustment in transmit direction
Level adjustment in receive direction
PSB 21381/2
PSB 21383/4
1 % deviation.
2001-03-12
Codec