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TS7514CFN Arkusz danych(PDF) 7 Page - STMicroelectronics

Numer części TS7514CFN
Szczegółowy opis  PROGRAMMABLE V.23 MODEM WITH DTMF
Download  19 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS7514CFN Arkusz danych(HTML) 7 Page - STMicroelectronics

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CARRIER LEVEL DETECTOR
- Output Level Detection conditions
The DCD signal detector output is set to logic
state 0 if the RMS value of the demodulator input
signal is greater than N1. The DCD output has
logic state 1 if the RMS value is less than N2.
The detector has an hysteresis effect : N1 - N2.
- Timing Detection Requirements
Signal detection time constants at the DCD out-
put comply with CCITT Recommendation V.23.
Modu lation Ratio
DCD Transition
CCITT V.23 (min)
Min.
Max.
CCITT V.23 (max)
Unit
1200bps
t1
t2
10
5
10
5
20
15
20
15
ms
ms
75bps (Note 1)
t1
t2
0
15
15
15
40
40
80
80
ms
ms
Note 1 : wide band Rx filter used (see Figure 7c).
N1
0V
N1
LINE
DCD
t
2
t
1
Note :
When delays are bypassed (see RPRX register programming) response time ranges from 0 to 5ms in receive mode at 1200bps,
and from 0 to 10ms at 75bps.
Figure 4 : Signal Detection Time Out
PROGRAMMING REGISTER (RPROG)
Address
Data
Selected Mode (note 1)
D7
D6
D5
D4
D3
D2
D1
D0
X
000
0
0
X
X
0
1
0
1
The most significant bit (D7) is not used when decoding control
register addresses.
0
X
0
1
Control register addressing is enabled when D7 = 0 (see note 2).
0
X
1
0
Control register addressing is enabled when D7 = 1 (see note 2).
0
0
X
X
Reception positioned in the channel opposite tothe transmission
channel controlled by MC/BC
0
1
X
X
Reception positioned in the same channel as transmission
(see note 3).
1
X
X
X
Programming inhibited in normal operating mode. This mode is
used for testing purposes.
Notes : 1. RPROG is set to 0000 on power-up.
2. Excepted for RPROG register whose address is always 000, regardless of D0 and D1.
3. This mode allows either full duplex operation on a 4-wire line, or circuit testing with external Tx/Rx loopback.
TS7514
7/19


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