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參數(shù)資料
| 型號(hào)： | TS7514CP |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | PROGRAMMABLE V.23 MODEM WITH DTMF |
| 中文描述： | 可編程.23調(diào)制解調(diào)器與雙音多頻 |
| 文件頁數(shù)： | 4/19頁 |
| 文件大?。?/td> | 170K |
| 代理商： | TS7514CP |
FUNCTIONAL DESCRIPTION
The TS7514 circuit is an FSK modem for half-du-
plex,voice-bandasynchronoustransmissionson a
2-wire line according to CCITT recommendation
V.23 or full duplexon 4 wire-line.
The circuit featuresDTMF dialing, call status tone
detection and line monitoring in both dialing and
automaticanswermodes.Asignallingfrequencyis
available at the line monitoring output (buzzer).
Ring detection is possible by using the signal de-
tection function and bypassing the receive filter.
Thereceivesignal at ZCO outputcan be filteredin
the associatedmicroprocessor.
The TRANSMIT channel (Tx)includes :
- Two programmablefrequencygenerators.
- Oneswitchedcapacitorfilter(SCF) withlow-pass
or bandpass configuration and its associated
propagationdelay corrector.
- One continuoustime low-pass smoothingfilter.
- One attenuator,programmable from 0 to + 13dB
by 1dBsteps.
- One programmableanalog input.
The RECEIVEchannel (Rx) includes :
- Two operational amplifiers for duplexer imple-
mentation.
- One continuoustime low-pass anti-aliasingfilter.
- One programmablegain amplifier.
- One linear compromise equalizer.
- One switched capacitor band pass filter (can be
set to either main or back channel).
- One continuoustime low passsmoothingfilter.
- One limiting amplifier.
- One correlationdemodulator.
- One programmablelevel signal detector.
Figure 2 :
InternalControlRegister
The LINE MONITORING channel includes:
- One buzzer.
- One 3-channelmultiplexerto select beetwen:
- Transmitchannel monitoring.
- Receive channel monitoring.
- Buzzer.
- One programmableattenuator
Internal Control
Power-upInitialization
TheTS7514includespower-upinitializationof con-
trol registers. This system sets the ATO transmis-
sion output to an infinite attenuation position,
leaving time for the microprocessor to set up the
RPROG input on power up. Control registers are
also initialized when V+ is lower than 3V or V-
greater than -3V.
Registers
WriteaccesstotheDTMFdataregisterandtoother
controlregistersis achievedinserialmodethrough
TxD input or PRD input. Addressing of these 4 bit
registersis indirect.They are accessedthroughan
8 bitshiftregisteraddressedwhenMOD/DTMF= 0
and MC/BC = 0. Data sent to the TxD input is
strobedon the RTS signal trailing edge.
Serial data is sent to the TxD input, with Least
Significant Bit (LSB) first. The 4 Most Significant
Bits (MSB) contain the control register address
while the 4 LSB containassociated data.
Data transfer from the input register to the control
register(addressed bythe MSB’s)is startedbythe
operating mode (MODEM or DTMF) selection
(MOD/DTMF = 1 or MC/BC = 1).
D0
D1
D2
D3
D4
D5
D6
D7
MOD/DTMF
MC/BC
RTS
TxD or PRD
Data
Address
Time
RPROG
RDTMF
RATTE
RWLO
RPTF
RHDL
RPRX
RPROG
TxD or
PRD
RTS
CLK
Datas
Addresses
8-BIT SHIFTREGISTER
(Input Register)
4-Bit Control
Register
7
TS7514
4/19
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| TS7524 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
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