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TS7514 Scheda tecnica(PDF) 6 Page - STMicroelectronics

Il numero della parte TS7514
Spiegazioni elettronici  PROGRAMMABLE V.23 MODEM WITH DTMF
Download  19 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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OPERATING MODES
The various operating modes are defined by
MC/BC and MOD/DTMF inputs, and by the content
of a control register RPROG.
The TS7514 includes 8 control registers. Access to
each control register is achieved through an auxil-
liary 8-bit shift register (input register). The input of
that shift register is connected either to TxD or
PRD, depending upon the statusof the ENP control
pin (ie when ENP = 0 and ENP = 1 respectively).
In both cases, the RTS input receivesthe shift clock
and sequentialy transfer is controlled by setting
simultaneously MOD/DTMF and MC/BC to 0. The
previous internal status and data are memorized
during loading of the input register so that transmis-
sion continues properly. That feature allows the
user to modify transmission level or line monitoring
selection during transmission. The transmit chan-
nel operatingmode (Modem main or back channel,
DTMF) can only be modified when RTS = 1. When
RTS = 0, the ATO transmit output is enabled and
the preselected operating mode is activated. When
RTS returns to 1, Modem or DTMF transmission is
inhibited after the first zero crossing of the gener-
ated signal.
MOD/DTMF
MC/BC
Transmission (ATO)
Reception (RxD, DCD)
1
1
MODEM, Main Channel
MODEM, Back Channel
1
0
MODEM, Back Channel
MODEM, Main Channel
0
1
DTMF
DCD= Active Tone Detection (270 -500Hz) if RTS = 1
DCD = 1 if RTS = 0
0
0
If RTS = 0 when that configuration occurs, transmission and reception are not modified.
If RTS = 1 (no signal sent on the line), transmission is not modified and reception is set
up to detect 2100Hz tone (note 1).
Note 1 : The decision threshold of the demodulator output is shifted, so that RxD changes from 0 to 1 at 1950Hz instead of 1700Hz.
MODEM TRANSMISSION FREQUENCIES
Modulation
Rate
TxD
CCITT R35 AND V.23
Recommendations (Hz)
Frequency Generated with
Xtal at 3.579MHz (Hz)
Error (Hz)
75bps
1
0
390
±2
450
±2
390.09
450.45
+0.09
+0.45
1200bps
1
0
1300
±10
2100
±10
1299.76
2099.12
-0.24
-0.88
DTMF TRANSMISSION FREQUENCIES
Specifications
DTMF (Hz)
Frequency Generated with
Xtal at 3.579MHz (Hz)
Dividing Ratio
Error (%)
f1
f2
f3
f4
f5
f6
f7
f8
697
±1.8%
770
±1.8%
852
±1.8%
941
±1.8%
1209
±1.8%
1336
±1.8%
1477
±1.8%
1633
±1.8%
699.13
771.45
853.90
940.01
1209.31
1335.65
1479.15
1627.07
5120
4640
4192
3808
2960
2680
2420
2200
+0.31
+0.19
+0.22
-0.10
+0.03
-0.03
+0.15
+0.36
TS7514
6/19


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