TS7514CFN-TS7514CP Fast Delivery |IC PHOENIX CO.,LIMITED

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TS7514CFN-TS7514CP
PROGRAMMABLE V.23 MODEM WITH DTMF
TS7514
PROGRAMMABLE V.23 MODEM WITH DTMF
November 1998
PIN CONNECTIONS
AXTL
WLO
ATO
RAO1
RAI1
RAI2
RAO2
RFO
RDI
AGND
MOD/DTMF
MC/BC
RTS
ENP
DGND
TxD
PRD
XTALIN
XTALOUT
DCD
RxD
ZCO
DIP243212726131415161718
AGND
RAO1
RAI1
RAI2
N/CXTALOUT
XTALIN
N/C
PRD
TxD
DGND
ENP
N/C
DCD
RxD
ZCO
RDI
RFO
RAO2
RTSMC/BCN/CMOD/DTMFATXLWLOATO
PLCC28
ORDER CODES
Part Number Temperature Range Package
TS7514CP 0to70oC DIP24
TS7514CFN 0to70oC PLCC28
1.T PROGRAMMABLE MODES: Modem 75bps transmit, 1200bps receive Modem 1200bps transmit, 75bps receive DTMF dialing Call status tone detection Auxiliary analog transmit input Analogtest loopback. PROGRAMMABLE FUNCTIONS: Transmission level Hysteresisand detection level Filters (reception and transmission) Line monitoring and buzzer DTMF frequencies. FIXEDCOMPROMISE LINE EQUALIZER. AUTOMATIC BIAS ADJUSTMENT. INTEGRATEDDUPLEXER. STANDARD LOWCOST CRYSTAL (3.579MHz). TAX TONE REJECTION. POWER-UP INITIALIZATIONOF REGISTERS. OPERATES FROM ±5V. CMOS
DESCRIPTION
The TS7514isan FSK modem which canbe
programmedfor asynchronous half-duplex voice-
bandcommunicationsona 2-wirelineorfull duplexa 4-wire line.Its programming conceptmakesit
the ideal componentto design low-cost intelligent
modems, featuring auto dialing and auto answer-
ing. The TS7514 conformsto CCITT V.23 recom-
mendation. The chip incorporates DTMF dialing,
line monitoring, tone and dialing detection.
DIP24
(Plastic Package)
PLCC28
(Plastic Leaded Chip Carrier Package)
1/19
PIN DESCRIPTION
Name Pin Number Description
DIP24 PLCC28
MOD/DMTF 1 1 MODEMor DMTF Operating Mode Selection.
Also controls write operationsto control registers(if MOD/DMTF=0and
MC/BC=0).
MC/BC 2 3 Digital Control Input. MODEM mode,it sets transmission modeto mainor back channel.It also
permits selectionof dialingor control registers programming.
RTS 3 4 Requestto Send.
WhenRTS=0,the circuit sendsan analogsignalto theATO output.The signal
dependsonthe operating mode selected.
WhenRTS= 1,the signalsent toATOis suppressedafteritsfirstzero crossing.
When MOD/DMTF=0and MC/BC=0,the RTSpinactsasa clockfor serial
data loadinginto theinput register.
ENP 4 5 Serial Register Write Select Input. When ENP=0,the serial register inputis
connectedto TxD. When ENP=1,the register inputis connectedto PRD.
DGND 5 6 Digital Ground=0V.All digital signalsare referencedtothispin.
TxD 6 7 Digital Inputfor Transmitor Control Data
PRD 7 8 Digital Inputfor Control Data. Selected through ENP
XtaIIN 8 10 Crystal Oscillator Input.Canbetiedtoan external clock generator.
fQUARTZ= 3.579MHz.
XtaIOUT 9 11 Crystal Oscillator Output
DCD 10 13 Data Carrier Detect Output
RxD 11 14 Digital Receive Data Output
ZCO 12 15 Zero CrossingRx Digital Output (ringing detection)
RDI 13 16 Analog Outputforthe Receive Signal after Filteringor Analog Inputforthe
Amplifier-limiter.
RFO 14 17 Analog Receive Filter Output
RAO2 15 18 A2 Amplifier Output
RAI2 16 20 A2 Amplifier Inverting Input
RAI1 17 21 A1 Amplifier Inverting Input
RAO1 18 22 A1 Amplifier Output 19 23 Negative Supply Voltage:–5V ±5%
AGND 20 24 Analog Ground=0V. ReferencePinfor AnalogSignals 21 25 Positive Supply Voltage:+5V ±5%
ATO 22 26 Analog Transmit Output
WLO 23 27 Analog Outputfor Line Monitoringand Buzzer
ATxI 24 28 Direct Analog Input Transmit Filter
TS7514
2/19
CARRIER/TONE
FREQUENCY
GENERATOR
FILTER
ATTENUATOR
ATTENUATORBUZZER
ATxI
ATO
WLO
RAI1
INPUT SHIFT
REGISTER
DMTF DATA
TxD
PRD
ENP
RTS
MC/BC
MOD/DTMF
DCD
MODE
CONTROL CONTROL
REGISTERS
PROGRAMMABLE
FUNCTIONS
CARRIER/TONE
LEVEL DETECTOR
TxDATA
RxD
ZCO
DATA FSK
DEMODULATOR G Rx
FILTER
XtalOUT XtalIN
MASTER
CLOCK CLOCK
GENERATOR RAO1
RAI2
RAO2
DUPLEXER DGNDV- AGND
RDI RFO
TS7514
Figure1: Simplified Block Diagram
TS7514
3/19
FUNCTIONAL DESCRIPTION
The TS7514 circuitisan FSK modemfor half-du-
plex, voice-bandasynchronoustransmissionsona
2-wire line accordingto CCITT recommendation
V.23orfull duplexon4 wire-line.
The circuit features DTMF dialing,call status tone
detection and line monitoringin both dialing and
automaticanswermodes.A signallingfrequencyis
availableattheline monitoring output (buzzer).
Ring detectionis possibleby usingthe signalde-
tection function and bypassingthe receive filter.
The receive signalat ZCO outputcanbe filteredin
the associated microprocessor.
The TRANSMIT channel (Tx) includes: Two programmable frequencygenerators. One switched capacitorfilter (SCF) with low-pass bandpass configuration andits associated
propagation delay corrector. One continuoustime low-pass smoothing filter. One attenuator,programmable from0to+ 13dB 1dB steps. One programmableanalog input.
The RECEIVE channel (Rx) includes: Two operational amplifiersfor duplexer imple-
mentation. One continuoustime low-pass anti-aliasing filter. One programmablegain amplifier. One linear compromise equalizer. One switched capacitor band pass filter (canbe
setto either mainor back channel). One continuoustimelow pass smoothing filter. One limiting amplifier. One correlation demodulator. One programmablelevel signal detector.
The LINE MONITORING channel includes: One buzzer. One 3-channel multiplexerto select beetwen: Transmit channel monitoring. Receive channel monitoring. Buzzer. One programmable attenuator
Internal Control
Power-upInitialization
The TS7514includes power-upinitializationof con-
trol registers. This system setsthe ATO transmis-
sion outputtoan infinite attenuation position,
leaving timeforthe microprocessortosetupthe
RPROG inputon powerup. Control registersare
also initialized whenV+is lower than3VorV-
greater than -3V.
Registers
WriteaccesstotheDTMF data registerandto other
control registersis achievedinserialmode through
TxD inputor PRD input. Addressingof these4bit
registersis indirect.Theyare accessed throughan bitshift registeraddressedwhen MOD/DTMF=0
and MC/BC=0. Data sentto the TxD inputis
strobedonthe RTS signal trailing edge.
Serial datais senttothe TxD input, with Least
SignificantBit (LSB) first. The4 Most Significant
Bits (MSB) contain the control register address
whilethe4 LSB contain associated data.
Data transfer fromthe input registertothe control
register(addressedbythe MSB’s)is started bythe
operating mode (MODEMor DTMF) selection
(MOD/DTMF=1or MC/BC=1).D1D2D3D4D5D6D7
MOD/DTMF
MC/BC
RTS
TxDorPRD
Data Address
Time
RPROG
RDTMF
RATTE
RWLO
RPTF
RHDL
RPRX
RPROG
TxDor
PRD
RTS
CLK
Datas Addresses
8-BIT SHIFTREGISTER
(InputRegister)
4-BitControl
Register
Figure2: InternalControl Register
TS7514
4/19
TS7514
RDI
RDO
XTAL
OUT
XTAL
AGND
DGND
-5V
RWLO
RATTE
SERIAL
INPUT
REGISTER
AND
DATA
CONTROL
CARRIER
LEVEL
DETECTOR
FSK
DEMODULATOR
TIME
BASE
InternalClocks
RxD
ZCO
Mode
ATT
CORR
SCF
SCF
RAO2RAI2RAO1RAI1
DCD
Mode
RPROG
RHDL
RPRX
RPRF
RDTMF
DataAddress
MOD/
DTMF
MC/BC
RTS
TxD
PRD ENP
FREQUENCYGENERATOR
SCF
CORR
SCF
Mode
BUZZER
ATT
WLOATO
Analog
Loop
RPTF
ATxL A2
4-bit
Bus
Figure3: Detailed Block Diagram
TS7514
5/19
OPERATING MODES
The various operating modes are definedby
MC/BC andMOD/DTMF inputs,andby thecontenta control register RPROG.
TheTS7514includes8 controlregisters. Accessto
each control registeris achieved throughan auxil-
liary 8-bit shift register (input register).The inputof
that shift registeris connected eitherto TxDor
PRD,dependinguponthe statusof theENPcontrol
pin(ie when ENP=0 and ENP=1 respectively).
Inbothcases,the RTSinputreceivesthe shiftclock
and sequentialy transferis controlledby setting
simultaneously MOD/DTMF and MC/BCto0. The
previous internal status and dataare memorized
duringloadingofthe input registersothat transmis-
sion continues properly. That feature allowsthe
userto modifytransmission levelor linemonitoring
selection during transmission. The transmit chan-
nel operatingmode (Modemmain orbackchannel,
DTMF) canonlybe modifiedwhen RTS=1. When
RTS=0,the ATO transmit outputis enabled and
the preselectedoperatingmodeisactivated. When
RTS returnsto1, Modemor DTMF transmissionis
inhibited afterthe first zero crossingofthe gener-
ated signal.
MOD/DTMF MC/BC Transmission (ATO) Reception (RxD, DCD) 1 MODEM, Main Channel MODEM, Back Channel 0 MODEM, Back Channel MODEM, Main Channel 1 DTMF DCD= Active Tone Detection (270 -500Hz)if RTS=1…
DCD=1if RTS=0 0 If RTS=0 whenthat configuration occurs, transmissionand receptionarenot modified. RTS=1(no signal sentonthe line), transmissionisnot modifiedand receptionissetto detect 2100Hz tone (note1).
Note1:The decision thresholdof thedemodulator outputis shifted,sothatRxD changesfrom0to1at 1950Hz instead of1700Hz.
MODEM TRANSMISSION FREQUENCIES
Modulation
Rate TxD CCITT R35 AND V.23
Recommendations (Hz)
Frequency Generated with
Xtal at3.579MHz (Hz) Error (Hz)
75bps 1
390±2
450±2
+0.09
+0.45
1200bps 1
1300±10
2100±10
DTMF TRANSMISSION FREQUENCIES
Specifications
DTMF (Hz)
Frequency Generated with
Xtalat 3.579MHz(Hz) Dividing Ratio Error(%)
697 ±1.8%
770 ±1.8%
852 ±1.8%
941 ±1.8%
1209 ±1.8%
1336 ±1.8%
1477 ±1.8%
1633 ±1.8%
+0.31
+0.19
+0.22
+0.03
+0.15
+0.36
TS7514
6/19
CARRIER LEVEL DETECTOR OutputLevel Detection conditions
The DCD signal detector outputissetto logic
state0ifthe RMS valueofthe demodulatorinput
signalis greater than N1. The DCD output has
logic state1ifthe RMS valueis less thanN2.
The detector hasan hysteresis effect:N1-N2. Timing Detection Requirements
Signal detection time constantsatthe DCD out-
put complywith CCITT Recommendation V.23.
Modulation Ratio DCD Transition CCITT V.23 (min) Min. Max. CCITT V.23 (max) Unit
1200bps t1
75bps (Note1) t1
Note1:widebandRxfilterused(see Figure7c).
LINE
DCDt1
Note: When delays arebypassed (seeRPRX register programming) response timerangesfrom0to5msin receivemode at1200bps,
andfrom0 to10ms at75bps.
Figure4: Signal DetectionTime Out
PROGRAMMING REGISTER (RPROG)
Address Data Selected Mode (note1) D6 D5 D4 D3 D2 D1 D0 000 0
The most significantbit (D7)isnot used when decoding control
register addresses. X 0 1 Control register addressing isenabled whenD7=0 (seenote2). X 1 0 Control register addressing isenabled whenD7=1 (seenote2). 0 X X Reception positionedinthe channelopposite tothetransmission
channel controlledby MC/BC 1 X X Reception positionedinthe same channelas transmission
(see note3). X X X Programming inhibitedin normal operating mode. This modeis
usedfor testing purposes.
Notes:1. RPROGis setto 0000 onpower-up. Exceptedfor RPROG register whose addressis always000, regardlessofD0andD1.This mode allowseitherfull duplex operationona 4-wireline,or circuit testingwith external Tx/Rxloopback.
TS7514
7/19
DTMF DIALING DATA REGISTER (RDTMFREGISTER)
Address Data Tone Frequency (Hz) D6 D5 D4 D3 D2 D1 D0 Low High 001 X X 00 697 X X 0 1 770 X X 1 0 852 X X 1 1 941 X 0 X X X 1209 1 X X X 1336 0 X X X 1477 1 X X X 1633
Notes:This registerisnot initializedon power-up. :don’tcare value.:1,0orX dependingupon RPROG content.
DATA REGISTER FOR THE TRANSMISSION ATTENUA TOR (RATE REGISTER)
Address Data Attenuation
(dB)
Output Transmit
Level (dBm) Line Level (dBm)
CouplerGain(- 6dB)D7 D6 D5 D4 D3 D2 D1 D0 010 00 00 0 +4 –2 01 1 +3 10 2 +2 –4 11 3 +1 –5 00 4 0 –6 01 5 –1 –7 10 6 –2 –8 11 7 –3 –9 00 8 –4 –10 01 9 –5 –11 10 10 –6 –12 11 11 –7 –13 00 12 –8 –14 01 13 –9 –15 1 1 0 Infinite <–64 <–70 1 1 1 Infinite* <–64* <–70* Power-up configuration.
LINEMONITORING PROGRAMMING REGISTER (RWLO REGISTER)
Address Data Line MonitoringIn Transmit
Mode Relative Level (dB)
Line MonitoringIn Receive
Mode Relative Level (dB) D6 D5 D4 D3 D2 D1 D0 011 00 00 –10 01 –20 10 –31 11 –42 00 0 01 –10 10 –20 11 –31 0 0 0 0.42VPP 0 0 1 – 10dB 0 1 0 – 20dB 0 1 1 – 31dB 1 X X <– 60dB* Power-up configuration.
Note: Signaling frequencyis asquare wave signalat 2982Hz.
TS7514
8/19
RECEIVE FILTER SELECTIONAND GAIN PROGRAMMING REGISTER (RPRF REGISTER)
Address Data Reception Gain
(dB) (note1) Comments D6 D5 D4 D3 D2 D1 D0 101 X X 00 0 0 1 +6* 1 0 +12 X 1 1 0 Rx Channel Band=Tx ChannelBandTxto Loopback– 33dBm≤Rx Level≤ 40dBm 0 X X X Receive FilterSelected 1 X X X Receive FilterDesabled X X X X Receive Filter Disconnected from RDI
Output and from Demodulator. Offset
Disabled. Power-up configuration.
Note1: Dependingontheline length,the received signal canbe amplified. Programmablereceptiongain allowsa levelcloseto +3dBm
atthefilterinputtotake benefitof themaximum filterdynamic range(S/N ratio).The following requirementmustbemet:
max.linelevel+ prog.gain ≤+3dBm.
TRANSMISSION FILTER PROGRAMMING REGISTER(RPTF REGISTER)
Address Data ATO TransmissionD7 D6 D5 D4 D3 D2 D1 D0 1 0 0 0 0 0 0 MODEMor DTMF Signal* 0 0 1 ATxIvia Smoothing Filterand Attenuator 0 1 0 ATxIvia Low-pass Filterand Attenuator 0 1 1 ATxIvia Band-pass Filterand Attenuator 1 0 0 In DTMF Mode, Transmisionof High Tone Frequency 0 0 0 In DTMF Mode, TransmissionofLow Tone Frequency Power-up configuration.
HYSTERESIS AND SIGNAL DETECTION LEVELPROGRAMMING REGISTER (RHDLREGISTER)
Address Data N2 (dBm) (note1)
See Figure4 N1/N2 (dB) D6 D5 D4 D3 D2 D1 D0 1 10 X 000 –43* X 001 –41 X 010 –39 X 011 –37 X 100 –35 X 101 –33 X 110 –31 X 111 –29 X X X X 3* X X X X 3.5 Power-up configuration.
Note1: Detectionlowlevel measuredat thedemodulator input.Theline signal detectionlevelis obtainedby reducingthegainatethefilter.
TS7514
9/19
RECEIVE CHANNEL PROGRAMMING REGISTER (RPRX REGISTER)
Address Data Configuration D6 D5 D4 D3 D2 D1 D0 1 1 1 X X 0 X Low Frequency Wide Band Selected (Figure7b) (Note1) X 1 X Low Frequency Narrow Band Selected (Figure7c) X X 0 Carrier Level Detector Delay Enabled* X X 1 Carrier Level Detector Delay Disabled.
Note1:In active tonedetection mode (MOD/DTMF=Ø, MC/BC=1,RTS=1seeop. modes),
Thelow frequencywide bandis automaticallyselectedfor thereceivechannel, whatever theRPRX register programmingvalue.
Aftera switchbackto modem mode (MOD/DTMF= 1,MC/BC=Øor1) theRPRX register indicates againthe value programmed
beforethe active tonedetection mode.
RTS
MC/BCand MOD/DTMF
TxDor PRD 564
Figure5:1st Case: Programmationwithout Data Transmission611 11Data D7 Data
Data
RTS
MC/BCand
MOD/DTMF
TxDor PRD
Figure6: 2nd Case: Programmation with TxD During Data Transmission
INPUT SHIFT REGISTER ACCESS
TS7514
10/19

Partno	Mfg	Dc	Qty	Available	Descript
TS7514CFN	ST	N/a	221	avai	PROGRAMMABLE V.23 MODEM WITH DTMF
TS7514CP	ST	N/a	1200	avai	PROGRAMMABLE V.23 MODEM WITH DTMF