TS7514
PROGRAMMABLE V.23 MODEM WITH DTMF
November 1998
7514-01.EPS /7514-02.EPS
PIN CONNECTIONS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
24
23
22
21
11
12
AXTL
WLO
ATO
V+
RAO1
RAI1
RAI2
RAO2
RFO
RDI
AGND
V-
MOD/DTMF
MC/BC
RTS
ENP
DGND
TxD
PRD
XTAL IN
XTAL OUT
DCD
RxD
ZCO
DIP24
5
6
7
8
9
10
11
25
24
23
22
21
20
19
4
3
2
1
28
27
26
12
13
14
15
16
17
18
V+
AGND
V-
RAO1
RAI1
RAI2
N/CXTAL OUT
XTAL IN
N/C
PRD
TxD
DGND
ENP
N/C
DCD
RxD
ZCO
RDI
RFO
RAO2
RTS
MC/BC
N/C
MOD/DTMF
ATXL
WLO
ATO
PLCC28
ORDER CODES
Part Number Temperature Range Package
TS7514CP 0 to 70oC DIP24
TS7514CFN 0 to 70oC PLCC28
7514-01.TBL
.PROGRAMMABLEMODES :
- Modem75bpstransmit, 1200bpsreceive
- Modem1200bpstransmit, 75bpsreceive
- DTMFdialing
- Callstatus tone detection
- Auxiliary analog transmit input
- Analogtestloopback
.PROGRAMMABLEFUNCTIONS :
- Transmission level
- Hysteresisand detectionlevel
- Filters (reception and transmission)
- Line monitoring and buzzer
- DTMFfrequencies
.FIXEDCOMPROMISE LINE EQUALIZER
.AUTOMATICBIAS ADJUSTMENT
.INTEGRATEDDUPLEXER
.STANDARDLOWCOSTCRYSTAL(3.579MHz)
.TAXTONE REJECTION
.POWER-UPINITIALIZATIONOF REGISTERS
.OPERATESFROM
±5V
.CMOS
DESCRIPTION
The TS7514 is an FSK modem which can be
programmed for asynchronous half-duplex voice-
bandcommunicationsona 2-wirelineorfullduplex
on a 4-wireline. Itsprogrammingconceptmakesit
the ideal component to design low-cost intelligent
modems, featuring auto dialing and auto answer-
ing. The TS7514 conforms to CCITT V.23 recom-
mendation. The chip incorporates DTMF dialing,
linemonitoring, tone and dialingdetection.
DIP24
(Plastic Package)
PLCC28
(Plastic Leaded Chip Carrier Package)
1/19
PIN DESCRIPTION
Name Pin Number Description
DIP24 PLCC28
MOD/DMTF 1 1 MODEM or DMTF Operating Mode Selection.
Also controls write operations to control registers (if MOD/DMTF = 0 and
MC/BC = 0).
MC/BC 2 3 Digital Control Input.
In MODEM mode, it sets transmission mode to main or back channel. It also
permits selection of dialing or control registers programming.
RTS 3 4 Request to Send.
When RTS = 0,the circuit sends an analogsignal to the ATO output. The signal
depends on the operating mode selected.
When RTS = 1,the signal sent to ATO is suppressed after its first zero crossing.
When MOD/DMTF = 0 and MC/BC = 0, the RTS pin acts as a clock for serial
data loading into theinput register.
ENP 4 5 Serial Register Write Select Input. When ENP = 0, the serial register input is
connected to TxD. When ENP = 1, the register input is connected to PRD.
DGND 5 6 Digital Ground = 0V. All digitalsignals are referenced to this pin.
TxD 6 7 Digital Input for Transmit or Control Data
PRD 7 8 Digital Input for Control Data. Selected through ENP
XtaIIN 8 10 Crystal Oscillator Input. Canbe tied to an 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 Crossing Rx Digital Output (ringing detection)
RDI 13 16 Analog Output for the Receive Signal after Filtering or Analog Input for the
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
V- 19 23 Negative Supply Voltage : – 5V ±5%
AGND 20 24 Analog Ground = 0 V. Reference Pin for AnalogSignals
V+ 21 25 Positive Supply Voltage : + 5V ±5%
ATO 22 26 Analog Transmit Output
WLO 23 27 Analog Output for Line Monitoring and Buzzer
ATxI 24 28 Direct Analog Input Transmit Filter
7514-02.TBL
TS7514
2/19
CARRIER/TONE
FREQUENCY
GENERATOR
Tx
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
TO
PROGRAMMABLE
FUNCTIONS
CARRIER/TONE
LEVEL DETECTOR
Tx DATA
RxD
ZCO
RX
DATA FSK
DEMODULATOR GRx
FILTER
Xtal OUT Xtal IN
MASTER
CLOCK CLOCK
GENERATOR
GRAO1
RAI2
RAO2
DUPLEXER
V+ DGND V- AGND
RDI RFO
TS7514
7514-03.EPS
Figure 1 : Simplified BlockDiagram
TS7514
3/19
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 duplex on 4 wire-line.
The circuit featuresDTMF dialing, call status tone
detection and line monitoring in both dialing and
automaticanswermodes.Asignallingfrequencyis
availableat the line monitoring output (buzzer).
Ring detection is possible by using the signal de-
tection function and bypassing the receive filter.
Thereceivesignal atZCO outputcan befilteredin
the associatedmicroprocessor.
The TRANSMIT channel (Tx)includes :
- Two programmable frequencygenerators.
- Oneswitchedcapacitorfilter(SCF) withlow-pass
or bandpass configuration and its associated
propagationdelay corrector.
- One continuoustime low-pass smoothing filter.
- One attenuator,programmable from 0 to + 13dB
by 1dBsteps.
- One programmableanalog input.
The RECEIVE channel (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 passsmoothing filter.
- One limiting amplifier.
- One correlation demodulator.
- One programmablelevel signal detector.
The LINE MONITORING channelincludes:
- One buzzer.
- One 3-channelmultiplexerto selectbeetwen:
- Transmitchannel monitoring.
- Receivechannel 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
registersisindirect.They are accessedthroughan
8 bitshiftregisteraddressedwhenMOD/DTMF= 0
and MC/BC = 0. Data sent to the TxD input is
strobed on 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 contain associated 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
7514-04.EPS
Figure 2 : InternalControl Register
TS7514
4/19
TS7514
RDI RDO XTAL OUT XTAL IN V+ AGND DGND V-
5V 0V 0V -5V
RWLO
RATTE
SERIAL INPUT
REGISTER
AND
DATA
CONTROL
CARRIER
LEVEL
DETECTOR
FSK
DEMODULATOR
TIME
BASE
MX
MX
Internal
Clocks
RxD
ZCO
Mode
G
ATT
RC MX CORR
SCF SCF GRC MX RAO2
RAI2
RAO1
RAI1
DCD
Mode RPROG RHDL RPRX RPRF
RDTMF
Data
Address
MOD/
DTMF
MC/BC
RTS
TxD
PRD
ENP
FREQUENCY
GENERATOR SCF CORR
SCF MX RC
Mode
MX
BUZZER ATT
MX WLO
ATO
Analog Loop
RPTF
ATxL
A1
A2
4-bit Bus
7514-05.EPS
Figure 3 : Detailed Block Diagram
TS7514
5/19
OPERATINGMODES
The various operating modes are defined by
MC/BCandMOD/DTMFinputs,andby thecontent
of a controlregister RPROG.
TheTS7514includes8 controlregisters.Accessto
each control register is achieved throughan auxil-
liary8-bit shiftregister(inputregister).The inputof
that shift register is connected either to TxD or
PRD,dependinguponthestatusoftheENPcontrol
pin (ie when ENP = 0 and ENP = 1 respectively).
Inbothcases,theRTSinputreceivestheshiftclock
and sequentialy transfer is controlled by setting
simultaneouslyMOD/DTMF and MC/BC to 0. The
previous internal status and data are memorized
duringloadingoftheinputregistersothattransmis-
sion continues properly. That feature allows the
usertomodifytransmissionlevelor linemonitoring
selection during transmission. The transmit chan-
neloperatingmode (Modemmainorbackchannel,
DTMF) canonly be modifiedwhen RTS = 1. When
RTS = 0, the ATO transmit output is enabled and
thepreselectedoperatingmodeisactivated.When
RTSreturns to 1, ModemorDTMF transmissionis
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 demodulatoroutput is shifted, so that RxD changes from 0 to 1 at 1950Hz instead of1700Hz.
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
0390 ±2
450 ±2390.09
450.45 +0.09
+0.45
1200bps 1
01300 ±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
CARRIER LEVEL DETECTOR
- OutputLevel Detectionconditions
The DCD signal detector output is set to logic
state 0 ifthe RMS value of thedemodulatorinput
signal is greater than N1. The DCD output has
logic state 1 if theRMS value is less than N2.
The detectorhasan hysteresiseffect : N1 - N2.
- Timing DetectionRequirements
Signal detection time constants at the DCD out-
put complywith CCITT RecommendationV.23.
Modulation Ratio DCD Transition CCITT V.23 (min) Min. Max. CCITT V.23 (max) Unit
1200bps t1
t2 10
510
520
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
t2
t1
Note : When delays are bypassed (see RPRX register programming) response time ranges from 0 to 5ms in receivemode at 1200bps,
and from 0 to10ms at75bps.
7514-06.EPS
Figure 4 : SignalDetectionTime Out
PROGRAMMING REGISTER (RPROG)
Address Data Selected Mode (note 1)
D7 D6 D5 D4 D3 D2 D1 D0
X0000
0X
X0
10
1
The most significantbit (D7) is not used when decoding control
register addresses.
0 X 0 1 Controlregister addressing isenabled whenD7 = 0(see note2).
0 X 1 0 Controlregister addressing isenabled whenD7 = 1(see note2).
0 0 X X Receptionpositionedinthechanneloppositetothe 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 Programminginhibited 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
DTMF DIALING DATA REGISTER(RDTMFREGISTER)
Address Data Tone Frequency (Hz)
D7 D6 D5 D4 D3 D2 D1 D0 Low High
P001XX00 697 X
X X 0 1 770 X
X X 1 0 852 X
X X 1 1 941 X
0 0 X X X 1209
0 1 X X X 1336
1 0 X X X 1477
1 1 X X X 1633
Notes : This register is not initialized on power-up.
X : don’t care value.
P : 1,0 or X depending upon RPROG content.
DATA REGISTERFOR THE TRANSMISSION ATTENUATOR (RATE REGISTER)
Address Data Attenuation
(dB) Output Transmit
Level (dBm) On Line Level (dBm)
Coupler Gain (- 6dB)
D7 D6 D5 D4 D3 D2 D1 D0
P0100000 0 +4 –2
0001 1 +3
0010 2 +2 –4
0011 3 +1 –5
0100 4 0 –6
0101 5 –1 –7
0110 6 –2 –8
0111 7 –3 –9
1000 8 –4 –10
1001 9 –5 –11
1010 10 –6 –12
1011 11 –7 –13
1100 12 –8 –14
1101 13 –9 –15
1 1 1 0 Infinite < – 64 < – 70
1 1 1 1 Infinite* < – 64 * < –70 *
* Power-up configuration.
LINEMONITORING PROGRAMMING REGISTER(RWLOREGISTER)
Address Data Line Monitoring In Transmit
Mode Relative Level (dB) Line Monitoring In Receive
Mode Relative Level (dB)
D7 D6 D5 D4 D3 D2 D1 D0
P0110000 –10
0001 –20
0010 –31
0011 –42
0100 0
0101 –10
0110 –20
0111 –31
1 0 0 0 0.42 VPP
1 0 0 1 – 10dB
1 0 1 0 – 20dB
1 0 1 1 – 31dB
1 1 X X < – 60dB*
* Power-up configuration.
Note : Signaling frequency is a square wave signal at 2982Hz.
TS7514
8/19
RECEIVE FILTER SELECTION AND GAIN PROGRAMMING REGISTER(RPRF REGISTER)
Address Data Reception Gain
(dB) (note 1) Comments
D7 D6 D5 D4 D3 D2 D1 D0
P101XX00 0
XX01 +6*
XX10 +12
X X 1 1 0 Rx Channel Band =Tx Channel B and Tx to
Rx Loopback – 33dBm ≤Rx Level≤40dBm
X 0 X X X Receive FilterSelected
X 1 X X X Receive FilterDesabled
1 X X X X Receive Filter Disconnected from RDI
Output and from Demodulator. Offset
Disabled.
* Power-up configuration.
Note 1 : Depending on the line length,thereceived signal can be amplified. Programmablereception gain allows a levelclose to +3dBm
at the filter input to take benefit of the maximum filter dynamic range (S/N ratio). The following requirement must be met :
max. line level + prog. gain ≤+3dBm.
TRANSMISSION FILTER PROGRAMMING REGISTER(RPTF REGISTER)
Address Data ATO Transmission
D7 D6 D5 D4 D3 D2 D1 D0
P 1 0 0 0 0 0 0 MODEM or DTMF Signal*
0 0 0 1 ATxI via Smoothing Filter and Attenuator
0 0 1 0 ATxI via Low-pass Filterand Attenuator
0 0 1 1 ATxI via Band-pass Filter and Attenuator
0 1 0 0 In DTMF Mode, Transmision of High Tone Frequency
1 0 0 0 In DTMF Mode, Transmission of Low Tone Frequency
* Power-up configuration.
HYSTERESIS AND SIGNAL DETECTION LEVELPROGRAMMING REGISTER(RHDLREGISTER)
Address Data N2 (dBm) (note 1)
See Figure4 N1/N2 (dB)
D7 D6 D5 D4 D3 D2 D1 D0
P110X000 –43* X
X001 –41 X
X010 –39 X
X011 –37 X
X100 –35 X
X101 –33 X
X110 –31 X
X111 –29 X
0XXX X 3*
1 X X X X 3.5
* Power-up configuration.
Note 1 : Detection low level measured at thedemodulator input. The line signal detection level is obtained by reducingthe gain ate the filter.
TS7514
9/19
RECEIVE CHANNEL PROGRAMMING REGISTER (RPRXREGISTER)
Address Data Configuration
D7 D6 D5 D4 D3 D2 D1 D0
P 1 1 1 X X 0 X Low Frequency Wide Band Selected (Figure 7b) (Note 1)
X X 1 X Low Frequency Narrow Band Selected (Figure 7c)
X X X 0 Carrier Level DetectorDelay Enabled*
X X X 1 Carrier Level DetectorDelay Disabled.
Note 1 :In active tone detection mode (MOD/DTMF = Ø, MC/BC = 1, RTS = 1 see op. modes),
The low frequency wide band is automatically selected for the receive channel, whatever the RPRX register programming value.
After a switch back to modem mode (MOD/DTMF = 1,MC/BC= Øor 1) the RPRX register indicates again the value programmed
before the active tone detection mode.
RTS
MC/BC and MOD/DTMF
TxD or PRD
1
2
3
45
6
78
9
4
7514-07.EPS
Figure 5 : 1st Case : Programmation without Data Transmission
56
1011 11
D0
Data
nD7 Data
n
Data
n1
RTS
MC/BC and
MOD/DTMF
TxD or PRD
7514-08.EPS
Figure 6 : 2nd Case : Programmationwith TxD During Data Transmission
INPUT SHIFT REGISTERACCESS
TS7514
10/19
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
DGND DGND (digital ground) to AGND (analog ground) – 0.3, + 0.3 V
V+ Supply Voltage V+ to DGND ro AGND – 0.3, + 7 V
V– Supply Voltage V- to DGND or AGND – 7, + 0.3 V
VIVoltage at any DigitalInput DGND - 0.3, V+ + 0.3 V
Vin Voltage at any Analog Input V– 0.3, V + + 0.3 V
IoCurrent at any Digital Output – 20, + 20 mA
Iout Current at any Analog Output – 10, + 10 mA
Ptot Power Dissipation 500 mW
Top Operating Temperature 0, + 70 °C
Tstg Storage Temperature – 65, + 150 °C
Tlead Lead Temperature (soldering, 10s) + 260 °C
Ifthe Maximum Ratings are exceeded, permanentdamage may be caused to the device. This is a stress rating only, and functional operation
ofthe deviceunder theseor anyother conditionsfor extendedperiods mayaffectdevice reliability.StandardCMOS handlingprocedures should
be employed to avoid possible damage to the device.
7514-03.TBL
ELECTRIC OPERATING CHARACTERISTICS
Symbol Parameter Min. Typ. Max. Unit
V+ Positive Supply Voltage 4.75 5 5.25 V
V– Negative Supply Voltage – 5.25 – 5.0 – 4.75 V
I+ V+ Operating Current – 10 15 mA
I- V- Operating Current – 15 – 10 – mA
7514-04.TBL
DC AND OPERATING CHARACTERISTICS
Electrical characteristics are guaranteedover the completetemperature range, with typical load unless
otherwisespecified.Typical values are given for : V+=+5V,V
−= -5V androom temperature= 25oC
Symbol Parameter Test Conditions Min. Typ. Max. Unit
DIGITAL INTERFACE (MOD/DTMF, RTS, DCD, RxD, ZCO, TxD, MC/BC, ENP, PRD)
VIL Input Voltage, Low Level – – 0.8 V
VIH Input Voltage, High Level – 2.2 – – –
IIL Input Current, Low Level DGND < Vi<V
IL (max) – 10 – 10 µA
IIH Input Current, High Level VIH (min) < VI< V+ – 10 – 10 µA
IOL Output Current, Low Level VOL = 0.4V 1.6 – – mA
IOH Output Current, High Level VOH = 2.8V – – – 250 µA
ANALOG INTERFACE-PROGRAMMABLE (ATxl)
Vin Input Voltage Range – 1.8 – + 1.8 V
Iin Input Current (filter output selected) – 10 – + 10 µA
Cin Input Capacitance (ATT output selected) – – 20 pF
Rin Input Resistance (ATT output selected) 100 – – kΩ
ANALOG INTERFACE -TRANSMIT OUTPUT (ATO) (load conditions RL= 560Ω,C
L= 100pF)
VOS Output Offset Voltage – 250 – + 250 mV
CLLoad Capacitance – – 100 pF
RLLoad Resistance – 560 – Ω
Vout Output Voltage Swing – 1.8 – + 1.8 V
Rout Output Resistance 10 – 25 Ω
– ATO Attenuation Ratio when RTS = 1 70 – – dB
7514-05.TBL
TS7514
11/19
DC AND OPERATING CHARACTERISTICS (continued)
Electrical characteristics are guaranteedover the completetemperature range, with typical load unless
otherwisespecified.Typical values are given for : V+=+5V,V
−= -5V androom temperature= 25oC
Symbol Parameter Test Conditions Min. Typ. Max. Unit
ANALOG INTERFACE -LINE MONITORING (WLO (load conditions , RL= 10kΩ,C
L= 50pF)
VOS Output Offset Voltage – 250 – + 250 mV
CLLoad Capacitance – – 100 pF
RLLoad Resistance 10 – – kΩ
Vout Output Voltage Swing – 1.8 – + 1.8 V
Rout Output Resistance – – 15 Ω
– WLO Attenuation Ratio 70 – – dB
ANALOG INTERFACE -DUPLEXER (RAI+, RAI-, RA0)
Vin Input Voltage Range RAI+, RAI– –2 – +2 V
lin Input Current RAI+, RAI– –10 – +10 µA
Cin Input Capacitance RAI+, RAI– – – 10 pF
Voff Input Offset Voltage RAI+, RAI– –20 – +20 mV
Vout Output voltage Swing, RA0 CL= 100pF RL= 600Ω
RL= 300 Ω–1.8
–0.9 –
–+1.8
+0.9 V
V
CLLoad Capacitance RA01 CL= 100pF – – 100 pF
RLLoad Resistance RA01 300 – – Ω
G DC voltage Gain in Large Signals, RA01 CL= 100pF, RL= 300Ω60 – – dB
CMRR Common Mode Rejection Ratio, RA01, RA02 60 – – dB
PSRR Supply Voltage Rejection Ratio,RA01, RA02 60 – – dB
Vout Output Voltage Swing, RA02 CL= 50pF, RL= 10kΩ–2.5 – 2.5 pF
CLLoad Capacitance, RA02 – – 50 pF
RLLoad Resistance, RA02 10 – – kΩ
AVODC Voltage Gain in Large Signals, RA02 – – dB
ANALOG INTERFACE-RECEIVEFILTER OUTPUT (RFO)
Amplifier Limiter Input (RDI)
Vin Input Voltage Range (RPRF = 1 xxx) – 2.2 – + 2.2 V
Rin Input Resistance (RPRF = 1 xxx) 1.5 – – kΩ
Cin Input Capacitance (RPRF = 1 xxx) – – 20 pF
CLLoad Capacitance (RPRF = 1 xxx) – – 50 pF
RLLoad Resistance 1.5 – – kΩ
Vout Output Voltage Swing CL= 50pF, RL= 1.5kΩ– 1.8 – + 1.8 V
Rout Output Resistance – – 15 Ω
DYNAMIC CHARACTERISTICS FOR PROGRAMMING REGISTER ACCESS (see Figures 5 and 6)
tCYC (1) Cycle Time 600 – – ns
Pwel (2) Pulse Width, RTS Low 300 – – ns
PWeh (3) Pulse Width, RTS High 300 – – ns
tr,t
f(4) RTS Rise and Fall Times – – 50 ns
tHCE (5) Control Input HoldingTime 100 – – ns
tSCE (6) Control Input SetupTime 300 – – ns
tSDI (7) TxD or PRD Input Setup Time 200 – – ns
tHDI (8) TxD or PRD Input Hold Time 100 – – ns
tWW (9) TWW Input Writing Inpulsion Width (high level) 300 – – ns
tBD (10) TxD InputSetup Time 100 – – ns
tHD (11) TxD Input Hold Time 100 – – ns
7514-06.TBL
TS7514
12/19
DC AND OPERATING CHARACTERISTICS (continued)
Electrical characteristics are guaranteedover the completetemperature range, with typical load unless
otherwisespecified.Typical values are given for : V+=+5V,V
−= -5V androom temperature= 25oC
Symbol Parameter Test Conditions Min. Typ. Max. Unit
TRANSMIT FILTER TRANSFER FUNCTION (load conditions : RL= 560Ω,C
L= 100pF)
GAR Absolute Gainat 2100Hz – 0 – dB
GHH Gain Relative to Gain at 1700Hz Band-pass
< 390Hz
= 390Hz
= 450Hz
= 1100Hz
Band-pass or Low-pass
1100Hz to 2300Hz
3300Hz
5800Hz
> 16000Hz
–
–
–
- 0.5
- 0.5
–
–
–
–
–
–
–
–
–3
–
–
-30
-35
-35
+0.5
+0.5
–
-15
-35
dB
dB
dB
dB
dB
dB
dB
dB
DAR Group Delay (modem transmission)
Main Channel: from 380 to 460Hz
Back Channel : from 1100 to 2300Hz 90
1.04 –
–110
1.08 µs
ms
ATTENUATOR TRANSFER FUNCTION
ATT Absolute Gain for 0dB Programmed 0.3 0 0.3 dB
RAT Attenuation Relative toProgrammed Value
Attenuation for Programmed Value = ∞- 0.5
70 -
-+0.5 dB
dB
RLT Relative Attenuation between two Consecutive Steps 0.8 - 1.2 dB
TRANSMIT GENERAL CHARACTERISTICS
Modem Amplitude (Att = 0dB) 390Hz
450Hz
1300Hz
2100Hz
+3.5
+3.5
+3.5
+3.5
–
–
–
–
+4.5
+4.5
+4.5
+4.5
dBm
dBm
dBm
dBm
DTMF Amplitude (Att = 0dB)
- Low Frequency Group
- Low Frequency Group versus Low Frequency Group -3
+1.5 –
–-1.5
+2.5 dBm
dB
Psophometric Noise – – 250 µV
RECEIVE FILTER TRANSFER FUNCTION
GAR Absolute Gain at 1100Hz - Main Channel
(0dB programmed) – 0.5 – + 0.5 dB
GRR Gain Relative to the Gain at 1300Hz
(0dB programmed) < 150Hz
150Hz to 450Hz
1300Hz
2100Hz
2300Hz
5500Hz to 10000Hz
> 10000Hz
–
–
– 0.5
1.1
–
–
–
–
–
–
1.8
–
–
–
–60
–50
0.5
2.3
2.7
–50
–60
dB
dB
dB
dB
dB
dB
dB
GAR Absolute Gainat 420Hz
(back channel - narrow band) (0dB programmed) 0.5 – + 0.5 dB
GRR Gain Relative to Gain at420Hz (0dB programmed) < 150Hz
380Hz
400Hz to 440Hz
460Hz
1100Hz to 10000Hz
> 10000Hz
–
–
– 0.5
–
–
–
–
–
–
–
–
–
–50
+ 0.5
+ 0.5
+ 0.5
–50
–60
dB
dB
dB
dB
dB
dB
GAR Absolute Gainat 425Hz (tone detection or back
channel wide band) (0dB programmed) – 0.5 – + 0.5 dB
GRR Gain Relative to Gain at425Hz (0dB programmed) < 112Hz
275Hz
300Hz to 525Hz
575Hz
1375Hz to 10000Hz
> 10000Hz
–
–
– 0.5
–
–
–
–
–
–
–
–
–
–50
+ 0.5
+ 0.5
+ 0.5
–50
–60
dB
dB
dB
dB
dB
dB
Psophometric Noise – – 300 µV
7514-07.TBL
TS7514
13/19
DC AND OPERATING CHARACTERISTICS (continued)
Electrical characteristics are guaranteedover the completetemperature range, with typical load unless
otherwisespecified.Typical values are given for : V+=+5V,V
−= -5V androom temperature= 25oC
Symbol Parameter Test Conditions Min. Typ. Max. Unit
RECEIVE TRANSFER - GENERAL CHARACTERISTICS
Absolute Filter Gain for :
0dB programmed
6dB programmed
12dBprogrammed
– 0.5
+ 5.5
+ 11.5
–
–
–
+ 0.5
+ 6.5
12.5
dB
RDS Signal Detection Level Relative to ProgrammedValue – 0.5 – + 0.5 dB
RHY Hysteresis Value – 2 – – dB
Signal Level (loop 3) at Reception Input – 40 – 35 – 33 dBm
LINE MONITORING - GENERAL CHARACTERISTICS (load conditions : RL= 10kΩ,C
L= 50pF)
ATT Absolute Gain for 0dB Programmed – 0 – dB
RAT
-Attenuation Relative toProgrammed Value
Attenuation for Programmed Value –1
70 –
–+1 dB
dB
FS Buzzer Signalling Frequency – 2982 – Hz
Signalling Frequency Amplitude at 0.42VPP Programmed 0.38 0.42 0.46 VPP
7514-08.TBL
TS7514
14/19
TransmissionSpectrum
At the ATO output, the out-of-band signal power
conformsto the followingspecifications:
Receiver
Measurementconditions
Local transmit level : -10dBm on lower channel at
75bps.
Receive level : -25dBm, with 511 bit pseudo-ran-
domtest pattern.
Testequipment : TRT sematest.
Isochronous distortion
Thefollowing tableshowstypical isochronousdis-
tortionobtainedwith the TS7514circuit:
Line Reception (1200) Reception (75)
Line 1 (fiat) 10 % 4 %
Line 2 12 % 4 %
Line 3 18 % 6 %
Line 4 14 % 6 %
Bit error rate
Typical bit error rates versus while noise are as
follows(noiseandsignallevelsaremeasuredwith-
out weighting on the 300/3400Hz):
Reception (1200) Reception (75)
S/N BER S/N BER
Line 1 6 dB 2.10 –3 – 3 dB 2.10 –3
Line 2 7 dB 2.10 –3 – 3 dB 2.10 –3
Line 3 8 dB 2.10 –3 – 3 dB 2.10 –3
Line 4 7 dB 2.10 –3 – 3 dB 2.10 –3
0dB
25dB
55dB
2001643.4
f(kHz)
7514-10.EPS
ReceiveFilter Transfer Characteristics
0.1 1 10 100
0
-10
-20
-30
-40
-50
-60
-70
FREQUENCY (kHz)
GAIN(dB)
7514-09A.EPS
Figure 7a : Main Channel
0.1 1 10 100
0
-10
-20
-30
-40
-50
-60
-70
FREQUENCY (kHz)
GAIN(dB)
7514-09B.EPS
Figure 7b : Back Channel- NarrowBand
0.1 1 10 100
0
-10
-20
-30
-40
-50
-60
-70
FREQUENCY (kHz)
GAIN(dB)
7514-09C.EPS
Figure 7c : Basic Channel
Wide band and Tone Detection
TS7514
15/19
CHARACTERISTICS OF TESTLINES
10
5
0
0123kHz
msCCETT LINE (FLAT)
2
1
0
7514-11.EPS
Figure 8
10
5
0
0 1 2 3 kHz
msCCETT LINE 2 (10%)
2
1
0
7514-12.EPS
Figure 9
0123kHz
msCCETT LINE 3 (90%)
20
15
10
5
00
1
2
3
4
7514-13.EPS
Figure 10
0123kHz
msCCETT LINE 2 (10%)
20
15
10
5
00
1
2
3
4
7514-14.EPS
Figure 11
TS7514
16/19
POWER SUPPLIESDECOUPLING AND LAYOUTCONSIDERATIONS
Powersuppliesto digitalsystemsmaycontainhigh
amplitudespikes and othernoise.To optimizeper-
formances of the TS7514 operating in close prox-
imity to digital systems, supply and ground noise
shouldbe minimized.
Thisinvolvesattentionto powersupplydesignand
circuit board layout.
The power supplies should be bypassedwith tan-
talum or electrolyticcapacitorsto obtain noise free
operation. These capacitors should be located
close to the TS7514. The electrolytic type capaci-
tors for improved high frequencyperformance.
Power supplies connections should be short and
direct. Ground loops should be avoided.
+5V -5V
10µF10µF
++
External
Signal
560Ω18kΩ
12kΩ
100nF To
Loudspeaker
Amplifier
39kΩ
6.8kΩ
2.2µF
270kΩ
1.5kΩ
1µF
CTP 120Ω
(670 90003)
(*)
L1/TPH1
L2
TRISIL
(TPA 270A 18)
TPH2
Transfo.
(EMTL 162)
12pF
12pF
3.579MHz
(LS04)
4.7kΩ
+5V
2N2222
1N4148
C
O
N
T
R
O
L
S
EXTAL
U.A.R.T.
M.C.U.
(*) : RegulationRequired in FranceOnly
TxD
RxD
PRD
RTS
MC/BC
MOD/DTMF
ENP
DCD
ZCO
XTALOUT XTAL IN
RDI
RFO
WLO
RAO2
RAI2
ATO
RAI1
RAO1
V+ATxI GNDD GNDA V-
T
S
7
5
1
4
560Ω12kΩ
100nF 100nF
7514-15.EPS
TYPICALAPPLICATION INFORMATION
TS7514
17/19
PM-DIP24.EPS
PACKAGE MECHANICAL DATA
24 PINS - PLASTICDIP
Dimensions Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
a1 0.63 0.025
b 0.45 0.018
b1 0.23 0.31 0.009 0.012
b2 1.27 0.050
D 32.2 1.268
E 15.2 16.68 0.598 0.657
e 2.54 0.100
e3 27.94 1.100
F 14.1 0.555
I 4.445 0.175
L 3.3 0.130
DIP24.TBL
TS7514
18/19
PMPLCC28.EPS
PACKAGE MECHANICAL DATA
28 PINS - PLASTICLEADED CHIP CARRIER PLCC)
Dimensions Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 12.32 12.57 0.485 0.495
B 11.43 11.58 0.450 0.456
D 4.2 4.57 0.165 0.180
D1 2.29 3.04 0.090 0.120
D2 0.51 0.020
E 9.91 10.92 0.390 0.430
e 1.27 0.050
e3 7.62 0.300
F 0.46 0.018
F1 0.71 0.028
G 0.101 0.004
M 1.24 0.049
M1 1.143 0.045
PLCC28.TBL
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No licence is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previouslysupplied.STMicroelectronicsproducts are notauthorizedfor useas criticalcomp onentsin lifesupport devicesor systems
without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
1998 STMicroelectronics - All Rights Reserved
Purchase of I2C Components of STMicroelectronics, conveys a license under the Philips I2C Patent.
Rights to use these components in a I2C system,is granted provided that the system conforms to
the I2C StandardSpecifications as defined by Philips.
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany- Italy - Japan - Korea - Malaysia - Malta- Mexico - Morocco - The Netherlands
Singapore - Spain- Sweden - Switzerland- Taiwan - Thailand - UnitedKingdom - U.S.A.
http://www.st.com
TS7514
19/19
