Datasheet TS7514CP, TS7514CFN Datasheet (SGS Thomson Microelectronics)

PROGRAMMABLE V.23 MODEM WITH DTMF

.

PROGRAMMABLEMODES :

- Modem75bps transmit, 1200bpsreceive

- Modem1200bps transmit, 75bpsreceive

- DTMFdialing

- Callstatus tone detection

- Auxiliary analog transmitinput

- Analog testloopback

.

PROGRAMMABLEFUNCTIONS :

- Transmissionlevel

- Hysteresisand detection level

- Filters(reception and transmission)

- Line monitoring and buzzer

- DTMFfrequencies

.

FIXEDCOMPROMISELINE EQUALIZER

.

AUTOMATICBIAS ADJUSTMENT

.

INTEGRATEDDUPLEXER

.

STANDARDLOWCOSTCRYSTAL(3.579MHz)

.

TAXTONE REJECTION

.

POWER-UPINITIALIZATION OF REGISTERS

.

OPERATESFROM

.

CMOS

±

5V

TS7514

DIP24

(Plastic Package)

PLCC28

(Plastic Leaded Chip Carrier Package)

ona 4-wireline. Itsprogrammingconceptmakesit
the ideal component to design low-cost intelligent
modems, featuring auto dialing and auto answer­ing. The TS7514 conforms to CCITT V.23 recom­mendation. The chip incorporates DTMF dialing,
linemonitoring, tone and dialing detection.

DESCRIPTION

The TS7514 is an FSK modem which can be
programmed for asynchronous half-duplex voice­bandcommunicationsona 2-wirelineorfullduplex

PIN CONNECTIONS

DIP24

MOD/DTMF

MC/BC

RTS
ENP

DGND

TxD

PRD

XTAL IN

XTAL OUT

DCD

RxD

ZCO

1
2
3
4
5
6
7
8
9
10
11
12

24

AXTL

23

WLO

22

ATO

21

V+

20

AGND

19

V-

18

RAO1

17

RAI1

16

RAI2

15

RAO2

14

RFO

13

RDI

ORDER CODES

Part Number Temperature Range Package

TS7514CP 0 to 70
TS7514CFN 0 to 70

PLCC28

RTS

MC/BC

4

321

5

ENP

6

DGND

7

TxD

8

PRD

9

N/C

XTAL IN

10
11

12131415161718

N/C

DCD

o

C DIP24

o

C PLCC28

N/C

MOD/DTMF

ATXL

WLO

ATO

282726

RDI

RxD

ZCO

RFO

RAO2

25

V+

24

AGND

23

V-

22

RAO1

21

RAI1

20

RAI2

19

N/CXTAL OUT

7514-01.TBL

7514-01.EPS /7514-02.EPS

November 1998

1/19

TS7514

PIN DESCRIPTION

Name

MOD/DMTF 1 1 MODEM or DMTF Operating Mode Selection.

MC/BC 2 3 Digital Control Input.

RTS 3 4 Request to Send.

ENP 4 5

DGND 5 6 Digital Ground = 0V. All digital signals are referenced to this pin.

TxD 6 7 Digital Input for Transmit or Control Data

PRD 7 8 Digital Input for ControlData. Selected through ENP

XtaIIN 8 10 Crystal Oscillator Input. Can be tied to an external clock generator.

XtaIOUT 9 11 Crystal Oscillator Output

DCD 10 13 DataCarrier 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

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

Pin Number

DIP24 PLCC28

Description

Also controls write operations to control registers (if MOD/DMTF = 0 and
MC/BC= 0).

In MODEM mode, it sets transmission mode to main or back channel. It also
permits selection of dialing or control registers programming.

When RTS = 0, the circuit sends an analog signal to the ATO output.The signal
depends on the operating mode selected.
When RTS = 1,the signal sent to ATOis suppressedafter its firstzerocrossing.
When MOD/DMTF = 0 and MC/BC = 0, the RTS pin acts as a clock for serial
data loading into the input register.

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.

QUARTZ

= 3.579MHz.

f

Amplifier-limiter.

7514-02.TBL

2/19

Figure1 : SimplifiedBlock Diagram

TS7514

TxD

PRD

ENP

RTS

MC/BC

MOD/DTMF

DCD

TS7514

Tx DATA

MODE

CARRIER/TONE

LEVEL DETECTOR

CARRIER/TONE

FREQUENCY
GENERATOR

INPUT SHIFT

CONTROL

REGISTER

CONTROL

REGISTERS

ATxI

DMTF DATA

TO
PROGRAMMABLE
FUNCTIONS

Tx

FILTER

V+ DGND V- AGND

ATTENUATOR

ATTENUATORBUZZER

ATO

WLO

RxD

ZCO

RX

DATA

FSK

DEMODULATOR

Xtal OUT Xtal IN

G

MASTER

CLOCK

Rx

FILTER

CLOCK

GENERATOR

G

RDI RFO

DUPLEXER

RAI1
RAO1
RAI2
RAO2

7514-03.EPS

3/19

TS7514

FUNCTIONAL DESCRIPTION

The TS7514 circuit is an FSK modem for half-du­plex,voice-bandasynchronoustransmissions on a
2-wire line according to CCITT recommendation
V.23 or full duplexon 4 wire-line.

The circuit features DTMF 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 de­tection function and bypassing the receive filter.
Thereceive signal at ZCO outputcan befilteredin
the associated microprocessor.

TheTRANSMITchannel (Tx)includes :

- Twoprogrammablefrequencygenerators.

- Oneswitchedcapacitorfilter(SCF)withlow-pass
or bandpass configuration and its associated
propagationdelay corrector.

- Onecontinuous time low-passsmoothing filter.

- Oneattenuator,programmable from0 to + 13dB
by 1dB steps.

- Oneprogrammableanalog input.

TheRECEIVEchannel (Rx) includes:

- Two operational amplifiers for duplexer imple­mentation.

- Onecontinuous time low-passanti-aliasingfilter.

- Oneprogrammablegain amplifier.

- Onelinear compromiseequalizer.

- One switchedcapacitor band pass filter (can be
set to eithermain or back channel).

- Onecontinuous time low passsmoothing filter.

- Onelimiting amplifier.

- Onecorrelationdemodulator.

- Oneprogrammablelevel signal detector.

Figure2 :

InternalControl Register

RTS

The LINE MONITORINGchannelincludes:

- One buzzer.

- One 3-channelmultiplexer to selectbeetwen:

- Transmitchannel monitoring.

- Receivechannel monitoring.

- Buzzer.

- One programmableattenuator

Internal Control

Power-upInitialization

TheTS7514includespower-upinitializationof con­trol registers. This system sets the ATO transmis­sion 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 V­greater 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 trailingedge.
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 the4 LSB containassociated data.
Data transfer fromthe inputregister to the control
register(addressed bythe MSB’s)is startedby the
operating mode (MODEM or DTMF) selection
(MOD/DTMF= 1 or MC/BC= 1).

4/19

TxD or

PRD

Datas Addresses

CLK

8-BIT SHIFT REGISTER

(Input Register)

4-Bit Control

Register
RPROG

RDTMF

RATTE

RWLO

RPTF

RHDL

RPRX

RPROG

MOD/DTMF

MC/BC

RTS

TxD or PRD

D0 D1 D2 D3 D4 D5 D6 D7

Data Address

Time

7514-04.EPS

Figure3 : Detailed Block Diagram

TS7514

ATO

ATT

MX

MX RC

CORR

SCF

RATTE

RWLO

RPTF

4-bit Bus

RAI1

ATT

MX WLO

BUZZER

A1

Analog Loop

RAO1

RAI2

A2

RAO2

MX

RC

G

SCF

SCF

CORR

MX

5V 0V 0V -5V

Internal

Clocks

TIME

BASE

V+ AGND DGND V-

ATxL

Mode

TS7514

SCF

MX

FREQUENCY

GENERATOR

TxD

PRD

MX

ENP

RDTMF

Address

RTS

AND

DATA

REGISTER

SERIAL INPUT

MC/BC

Mode RPROG RHDL RPRX RPRF

Data

CONTROL

MOD/

DTMF

LEVEL

CARRIER

DETECTOR

DCD

Mode

RC

G

FSK

DEMODULATOR

RxD

ZCO

RDI RDO XTAL OUT XTAL IN

7514-05.EPS

5/19

TS7514

OPERATINGMODES

The various operating modes are defined by
MC/BCand MOD/DTMFinputs,andby thecontent
of a control register RPROG.
TheTS7514includes 8 controlregisters.Accessto
each control registeris achieved through an auxil­liary8-bit shiftregister(input register).The input of
that shift register is connected either to TxD or
PRD,dependinguponthe statusof theENPcontrol
pin (ie when ENP = 0 and ENP = 1 respectively).
Inbothcases,theRTSinputreceivesthe shiftclock
and sequentialy transfer is controlled by setting
simultaneouslyMOD/DTMF and MC/BC to 0. The

previous internal status and data are memorized
duringloadingof the inputregistersothattransmis­sion continues properly. That feature allows the
userto modifytransmissionlevelor linemonitoring
selection during transmission. The transmit chan­neloperatingmode(Modemmainor backchannel,
DTMF)canonly be modifiedwhenRTS =1. When
RTS = 0, the ATO transmit output is enabled and
thepreselectedoperatingmodeisactivated.When
RTSreturnsto 1, Modem or DTMF transmissionis
inhibited after the first zero crossing of the gener­ated signal.

MOD/DTMF MC/BC Transmission

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…

0 0 If RTS = 0 when that configuration occurs, transmission and reception are not modified.

Note 1 :

The decision thresholdof the demodulatoroutput is shifted, so thatRxD changes from 0 to 1 at 1950Hz instead of 1700Hz.

If RTS = 1 (no signal sent on the line), transmission is not modified and reception is set
up to detect 2100Hz tone (note 1).

(ATO)

DCD = 1 if RTS = 0

Reception

(RxD, DCD)

MODEMTRANSMISSIONFREQUENCIES

Modulation

Rate

75bps 1

1200bps 1

TxD

0

0

CCITT R35 AND V.23

Recommendations (Hz)

390 ±2
450 ±2

1300 ±10
2100 ±10

Frequency Generated with

Xtal at 3.579MHz (Hz)

390.09

450.45

1299.76

2099.12

DTMF TRANSMISSIONFREQUENCIES

Specifications

DTMF (Hz)

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%

Frequency Generated with

Xtal at 3.579MHz(Hz)

699.13

771.45

853.90

940.01

1209.31

1335.65

1479.15

1627.07

Dividing Ratio Error (%)

5120
4640
4192
3808
2960
2680
2420
2200

Error (Hz)

+0.09
+0.45

-0.24

-0.88

+0.31
+0.19
+0.22

-0.10

+0.03

-0.03
+0.15
+0.36

6/19

TS7514

CARRIER LEVEL DETECTOR

- OutputLevel Detection conditions
The DCD signal detector output is set to logic
state 0 ifthe RMSvalueof thedemodulatorinput
signal is greater than N1. The DCD output has
logic state 1 if theRMS value is less than N2.

ModulationRatio DCD Transition CCITT V.23 (min) Min. Max. CCITT V.23 (max) Unit

1200bps t1

t2

75bps (Note 1) t1

t2

Note 1 : wide band Rx filterused (see Figure 7c).

10

15

The detectorhas an hysteresiseffect : N1 - N2.

- Timing Detection Requirements
Signal detection time constants at the DCD out­put complywith CCITTRecommendationV.23.

5
0

5

15
15

10

20
15

40
40

20
15

80
80

ms
ms

ms
ms

Figure4 :

Note :

PROGRAMMING REGISTER

D7 D6 D5 D4 D3 D2 D1 D0

X0000

SignalDetectionTime Out

N1

LINE

DCD

t

1

When delays arebypassed (see RPRX register programming) response time ranges from 0 to5ms in receivemode at 1200bps,
and from 0 to10ms at75bps.

t

2

N1

0V

(RPROG)

Address Data

X

0

X

0
1

0

The most significant bit (D7) is not used when decodingcontrol

1

register addresses.

Selected Mode (note 1)

0 X 0 1 Controlregister addressing is enabled when D7= 0(seenote2).
0 X 1 0 Controlregister addressing is enabled when D7= 1(seenote2).
0 0 X X Receptionpositionedinthe channeloppositetothe 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 modeis

used for testing purposes.

Notes :

1. RPROG is setto 0000 on power-up.

2. Excepted for RPROGregister 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.

7514-06.EPS

7/19

TS7514

DTMF DIALING DATA REGISTER

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 notinitialized on power-up.

X : don’t care value.
P : 1,0 or X depending upon RPROG content.

DATAREGISTERFOR THETRANSMISSIONATTENUATOR

Address Data

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.

(RDTMFREGISTER)

Attenuation

(dB)

(RATE REGISTER)

Output Transmit

Level (dBm)

On Line Level (dBm)
CouplerGain (- 6dB)

LINEMONITORINGPROGRAMMINGREGISTER

Address Data

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 V
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 frequencyis asquare wave signal at 2982Hz.

8/19

(RWLOREGISTER)

Line Monitoring In Transmit

Mode Relative Level (dB)

Line Monitoring In Receive

Mode Relative Level (dB)

PP

RECEIVEFILTERSELECTIONAND GAINPROGRAMMING REGISTER(RPRF REGISTER)

Address Data

D7 D6 D5 D4 D3 D2 D1 D0

P101XX00 0

XX01 +6*
XX10 +12
X X 1 1 0 RxChannel Band = Tx ChannelB andTx to

X 0 X X X Receive FilterSelected
X 1 X X X Receive FilterDesabled

1 X X X X Receive Filter Disconnected from RDI

* Power-up configuration.

Note 1 :

Depending on the line length, the received signal can be amplified. Programmablereception gain allows a levelclose to +3dBm
atthefilterinput to take benefit of the maximum filter dynamic range(S/N ratio). The following requirement must be met :
max. line level + prog. gain ≤+3dBm.

Reception Gain

(dB) (note 1)

Comments

Rx Loopback – 33dBm ≤ Rx Level ≤ 40dBm

Outp ut and from Demo dulat or . Off s e t
Disabled.

TS7514

TRANSMISSION FILTER PROGRAMMING REGISTER

Address Data

D7 D6 D5 D4 D3 D2 D1 D0

(RPTF REGISTER)

ATO Transmission

P 1 0 0 0 0 0 0 MODEM or DTMF Signal*

0 0 0 1 ATxI via Smoothing Filter andAttenuator
0 0 1 0 ATxI via Low-pass Filter and Attenuator
0 0 1 1 ATxI via Band-pass Filter andAttenuator
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 SIGNALDETECTION LEVELPROGRAMMING REGISTER

Address Data

D7 D6 D5 D4 D3 D2 D1 D0

N2 (dBm) (note 1)

See Figure 4

(RHDLREGISTER)

N1/N2 (dB)

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 the demodulator input. The line signal detection level is obtained by reducing the gain ate the filter.

9/19

TS7514

RECEIVECHANNEL PROGRAMMING REGISTER(RPRXREGISTER)

Address Data

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 frequencywide band is automatically selected for thereceivechannel, whatever the RPRX register programming value.
After a switch back to modem mode (MOD/DTMF = 1,MC/BC= Ø or 1) the RPRX register indicates again the value programmed
before the active tonedetection mode.

INPUTSHIFT REGISTER ACCESS
Figure5 : 1st Case: Programmationwithout Data Transmission

1

2

Configuration

Figure 6 :

RTS

MC/BC and MOD/DTMF

TxD or PRD

4

6

78

3

4

2nd Case : Programmationwith TxD During Data Transmission

RTS

MC/BC and
MOD/DTMF

TxD or PRD

Data

n1

Data

n

D0

D7

5

9

7514-07.EPS

56

1011 11

Data

n

7514-08.EPS

10/19

TS7514

ABSOLUTE MAXIMUMRATINGS

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

V

I

V

in

I

o

I

out

P

tot

T

op

T

stg

T

lead

Ifthe Maximum Ratingsare exceeded, permanentdamage may be caused to the device. This is a stress rating only, and functionaloperation
ofthe device under these or anyother conditionsfor extendedperiodsmay affectdevice reliability.Standard CMOS handlingprocedures should
be employed to avoid possible damage to the device.

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

Voltage at any Digital Input DGND - 0.3, V+ + 0.3 V
Voltage at any Analog Input V– 0.3, V + + 0.3 V
Current at any Digital Output – 20, + 20 mA
Current at any Analog Output – 10, + 10 mA
Power Dissipation 500 mW
Operating Temperature 0, + 70 °C
Storage Temperature –65, + 150 °C
Lead Temperature (soldering, 10s) + 260 °C

7514-03.TBL

7514-04.TBL

DCAND OPERATING CHARACTERISTICS

Electrical characteristicsare guaranteedover thecomplete temperature range,with typical load unless
otherwisespecified.Typical valuesare given for : V

Symbol Parameter Test Conditions Min. Typ. Max. Unit

DIGITAL INTERFACE (MOD/DTMF, RTS, DCD, RxD, ZCO, TxD, MC/BC, ENP, PRD)

V

IL

V

IH

I

IL

I

IH

I

OL

I

OH

ANALOG INTERFACE-PROGRAMMABLE (ATxl)

V

in

I

in

C

in

R

in

ANALOG INTERFACE -TRANSMIT OUTPUT (ATO) (load conditions R

V

OS

C

L

R

L

V

out

R

out

– ATO Attenuation Ratio when RTS = 1 70 – – dB

Input Voltage, Low Level – – 0.8 V
Input Voltage, High Level – 2.2 – – –
Input Current, Low Level DGND < Vi<VIL(max) – 10 – 10 µA
Input Current, High Level VIH(min) < VI< V+ – 10 – 10 µA
Output Current, Low Level VOL= 0.4V 1.6 – – mA
Output Current, High Level VOH= 2.8V – – – 250 µA

Input Voltage Range – 1.8 – + 1.8 V
Input Current (filter output selected) – 10 – + 10 µA
Input Capacitance (ATT output selected) – – 20 pF
Input Resistance (ATT output selected) 100 – – kΩ

Output Offset Voltage – 250 – + 250 mV
Load Capacitance – – 100 pF
Load Resistance – 560 – Ω
Output Voltage Swing – 1.8 – + 1.8 V
Output Resistance 10 – 25 Ω

+

=+5V,V−= -5V and room temperature= 25oC

= 560Ω,CL= 100pF)

L

7514-05.TBL

11/19

TS7514

DCAND OPERATING CHARACTERISTICS

Electrical characteristicsare guaranteedover thecomplete temperature range,with typical load unless
otherwisespecified.Typical valuesare given for : V

(continued)

+

=+5V,V−= -5V and room temperature= 25oC

Symbol Parameter Test Conditions Min. Typ. Max. Unit

ANALOG INTERFACE -LINE MONITORING (WLO (load conditions , R

V

C
R

V

R

Output Offset Voltage – 250 – + 250 mV

OS

Load Capacitance – – 100 pF

L

Load Resistance 10 – – kΩ

L

Output Voltage Swing – 1.8 – + 1.8 V

out

Output Resistance – – 15 Ω

out

= 10kΩ,CL= 50pF)

L

– WLO Attenuation Ratio 70 – – dB

ANALOG INTERFACE -DUPLEXER (RAI+, RAI-, RA0)

V

C
V
V

C
R

Input Voltage Range RAI+, RAI– –2 – +2 V

in

Input Current RAI+, RAI– –10 – +10 µA

l

in

Input Capacitance RAI+, RAI– – – 10 pF

in

Input Offset Voltage RAI+, RAI– –20 – +20 mV

off

Output voltage Swing,RA0 CL= 100pF RL= 600Ω

out

Load Capacitance RA01 CL= 100pF – – 100 pF

L

Load Resistance RA01 300 – – Ω

L

G DC voltage Gain in Large Signals, RA01 C

= 300 Ω

R

L

= 100pF, RL= 300Ω 60 – – dB

L

–1.8
–0.9

–
–

+1.8
+0.9VV

CMRR Common Mode Rejection Ratio, RA01, RA02 60 – – dB

PSRR Supply Voltage Rejection Ratio, RA01, RA02 60 – – dB

V

C
R

AV

Output Voltage Swing, RA02 CL= 50pF, RL= 10kΩ –2.5 – 2.5 pF

out

Load Capacitance, RA02 – – 50 pF

L

Load Resistance, RA02 10 – – kΩ

L

DC Voltage Gain in Large Signals, RA02 – – dB

O

ANALOG INTERFACE-RECEIVE FILTER OUTPUT (RFO)

Amplifier Limiter Input (RDI)

V
R
C

C

R

V

R

Input Voltage Range (RPRF = 1 xxx) – 2.2 – + 2.2 V

in

Input Resistance (RPRF = 1 xxx) 1.5 – – kΩ

in

Input Capacitance (RPRF = 1 xxx) – – 20 pF

in

Load Capacitance (RPRF = 1 xxx) – – 50 pF

L

Load Resistance 1.5 – – kΩ

L

Output Voltage Swing CL= 50pF, RL= 1.5kΩ – 1.8 – + 1.8 V

out

Output Resistance – – 15 Ω

out

DYNAMIC CHARACTERISTICS FOR PROGRAMMING REGISTER ACCESS (see Figures 5 and 6)

t

(1) Cycle Time 600 – – ns

CYC

(2) Pulse Width, RTS Low 300 – – ns

P

wel

(3) Pulse Width, RTS High 300 – – ns

P

Weh

(4) RTSRise and Fall Times – – 50 ns

t

r,tf

(5) ControlInput HoldingTime 100 – – ns

t

HCE

(6) Control Input Setup Time 300 – – ns

t

SCE

(7) TxD or PRD InputSetup Time 200 – – ns

t

SDI

(8) TxD or PRD InputHold Time 100 – – ns

t

HDI

(9) TWW Input Writing Inpulsion Width (high level) 300 – – ns

t

WW

(10) TxD Input Setup Time 100 – – ns

t

BD

(11) TxD Input Hold Time 100 – – ns

t

HD

7514-06.TBL

12/19

TS7514

DCAND OPERATING CHARACTERISTICS(continued)

Electrical characteristicsare guaranteedover thecomplete temperature range,with typical load unless
otherwisespecified.Typical valuesare given for : V

Symbol Parameter Test Conditions Min. Typ. Max. Unit

TRANSMIT FILTER TRANSFER FUNCTION (load conditions : R

G
G

D

ATTENUATOR TRANSFER FUNCTION

A

R
R

TRANSMIT GENERAL CHARACTERISTICS

RECEIVE FILTER TRANSFERFUNCTION

G
G

G

G

G

G

Absolute Gain at 2100Hz – 0 – dB

AR

Gain Relative to Gain at 1700Hz Band-pass

HH

Group Delay (modem transmission)

AR

Main Channel : from 380 to 460Hz
Back Channel : from 1100 to 2300Hz

Absolute Gain for 0dB Programmed 0.3 0 0.3 dB

TT

Attenuation Relative toProgrammed Value

AT

Attenuation for Programmed Value = ∞
Relative Attenuation between two Consecutive Steps 0.8 - 1.2 dB

LT

Modem Amplitude (Att = 0dB) 390Hz

DTMF Amplitude (Att = 0dB)

- Low Frequency Group

- Low Frequency Group versus Low FrequencyGroup
Psophometric Noise – – 250 µV

Absolute Gain at 1100Hz - MainChannel

AR

(0dB programmed)
Gain Relative to the Gain at 1300Hz

RR

(0dB programmed)

Absolute Gain at 420Hz

AR

(back channel - narrow band) (0dB programmed)
Gain Relative to Gain at 420Hz (0dB programmed) < 150Hz

RR

Absolute Gain at 425Hz (tone detection or back

AR

channel wide band) (0dB programmed)
Gain Relative to Gain at 425Hz (0dB programmed) < 112Hz

RR

Psophometric Noise – – 300 µV

+

=+5V,V−= -5V and room temperature= 25oC

= 560Ω,CL= 100pF)

L

< 390Hz
= 390Hz
= 450Hz
= 1100Hz

–
–
–

- 0.5

–
–
–
–

+0.5

Band-pass or Low-pass

1100Hz to 2300Hz
3300Hz
5800Hz
> 16000Hz

- 0.5
–
–
–

–

–3

–
–

+0.5

90

1.04––

1.08µsms

- 0.570--+0.5 dB

450Hz
1300Hz
2100Hz

+3.5
+3.5
+3.5
+3.5

+1.5––

-3

–

+4.5

–

+4.5

–

+4.5

–

+4.5

-1.5
+2.5

– 0.5 – + 0.5 dB

< 150Hz
150Hz to 450Hz
1300Hz
2100Hz
2300Hz
5500Hz to 10000Hz
> 10000Hz

–
–

– 0.5

1.1
–
–
–

–
–
–

1.8
–
–
–

–60
–50

–50
–60

0.5 – + 0.5 dB
–

–
380Hz
400Hz to 440Hz
460Hz
1100Hz to 10000Hz
> 10000Hz

–

– 0.5

–
–
–

–50

–

+ 0.5

–

+ 0.5

–

+ 0.5

–

–50

–

–60

– 0.5 – + 0.5 dB

–

–
275Hz
300Hz to 525Hz
575Hz
1375Hz to 10000Hz
> 10000Hz

–

– 0.5

–
–
–

–50

–

+ 0.5

–

+ 0.5

–

+ 0.5

–

–50

–

–60

-30

-35

-35

–

-15

-35
110

0.5

2.3

2.7

dB
dB
dB
dB

dB
dB
dB
dB

dB

dBm
dBm
dBm
dBm

dBm

dB

dB
dB
dB
dB
dB
dB
dB

dB
dB
dB
dB
dB
dB

dB
dB
dB
dB
dB
dB

7514-07.TBL

13/19

TS7514

DCAND OPERATING CHARACTERISTICS(continued)

Electrical characteristicsare guaranteedover thecomplete temperature range,with typical load unless
otherwisespecified.Typical valuesare given for : V

Symbol Parameter Test Conditions Min. Typ. Max. Unit

RECEIVE TRANSFER - GENERAL CHARACTERISTICS

Absolute Filter Gain for :

0dB programmed
6dB programmed
12dBprogrammed

R

R

LINE MONITORING - GENERAL CHARACTERISTICS (load conditions : R

A
R

Signal Detection Level Relative to ProgrammedValue – 0.5 – + 0.5 dB

DS

Hysteresis Value – 2 – – dB

HY

Signal Level (loop3) at Reception Input – 40 – 35 – 33 dBm

Absolute Gain for 0dB Programmed – 0 – dB

TT

Attenuation Relative toProgrammed Value

AT

-

Attenuation for Programmed Value

FS Buzzer SignallingFrequency – 2982 – Hz

Signalling Frequency Amplitude at 0.42V

+

=+5V,V−= -5V and room temperature= 25oC

+ 11.5

= 10kΩ,CL= 50pF)

L

– 0.5
+ 5.5

–170–

–
–
–

+ 0.5
+ 6.5

12.5

+1 dB

–

Programmed 0.38 0.42 0.46 V

PP

dB

dB

PP

7514-08.TBL

14/19

TS7514

ReceiveFilter TransferCharacteristics
Figure7a : Main Channel

0

-10

-20

-30

-40

GAIN(dB)

-50

-60

-70

0.1 1 10 100
FREQUENCY (kHz)

Figure7b

GAIN(dB)

Figure7c

: BackChannel - NarrowBand

0

-10

-20

-30

-40

-50

-60

-70

0.1 1 10 100
FREQUENCY (kHz)

: Basic Channel

Wide band and Tone Detection

TransmissionSpectrum

At the ATO output, the out-of-band signal power
conformsto the following specifications:

0dB

25dB

f(kHz)

55dB

7514-09A.EPS

2001643.4

Receiver

Measurementconditions
Local transmitlevel : -10dBm on lower channelat
75bps.
Receive level : -25dBm, with 511 bit pseudo-ran­domtest pattern.

Testequipment : TRT sematest.

Isochronousdistortion

Thefollowing tableshowstypical isochronousdis­tortionobtainedwith the TS7514circuit :

Line Reception

(1200)
Line 1 (fiat) 10 % 4 %
Line 2 12 % 4 %

7514-09B.EPS

Line 3 18 % 6 %
Line 4 14 % 6 %

Reception

7514-10.EPS

(75)

0

-10

-20

-30

-40

GAIN(dB)

-50

-60

-70

0.1 1 10 100
FREQUENCY (kHz)

Bit error rate

Typical bit error rates versus while noise are as
follows(noiseandsignallevelsare measuredwith­out weighting on the 300/3400Hz):

Reception

Line 1 6 dB 2.10
Line 2 7 dB 2.10
Line 3 8 dB 2.10
Line 4 7 dB 2.10

7514-09C.EPS

(1200)

S/N BER S/N BER

–3

– 3 dB 2.10

–3

– 3 dB 2.10

–3

– 3 dB 2.10

–3

– 3 dB 2.10

Reception

(75)

–3
–3
–3

–3

15/19

TS7514

CHARACTERISTICS OF TESTLINES
Figure8

10

5

0

0123kHz

Figure10

20

15

10

5

Figure 9

msCCETTLINE (FLAT)

2

10

5

1

0

0

7514-11.EPS

0 1 2 3 kHz

Figure11

msCCETTLINE 3 (90%)

4

3

2

1

20

15

10

5

msCCETTLINE 2 (10%)

2

1

0

7514-12.EPS

msCCETTLINE 2 (10%)

4

3

2

1

00

0123kHz

7514-13.EPS

00

0123kHz

7514-14.EPS

16/19

TYPICALAPPLICATION INFORMATION

+5V -5V

10µF10µF

++

External

Signal

100nF 100nF

V+ATxI GNDD GNDA V-

TxD

U.A.R.T.

RxD

C

O

PRD

RTS

T
S
7

N

MC/BC

5
1

M.C.U.

T

R

O

L

S

MOD/DTMF

ENP

DCD

ZCO

XTALOUT XTAL IN

4

RAO1

RAI1

ATO

RAI2

RAO2

WLO

RFO

RDI

Ω18kΩ

560

Ω12kΩ

560

100nF

(EMTL 162)

39kΩ

2.2µF

Transfo.

12kΩ

6.8kΩ

1µF

1.5kΩ

CTP 120Ω

(670 90003)

270k

To
Loudspeaker
Amplifier

TS7514

(*)

L1/TPH1

TRISIL
(TPA 270A 18)

Ω

L2

TPH2

EXTAL

(LS04)

(*) : RegulationRequired in France Only

12pF

3.579MHz

12pF

4.7kΩ

POWERSUPPLIESDECOUPLINGAND LAYOUTCONSIDERATIONS

Powersuppliesto digitalsystemsmay containhigh
amplitudespikes and othernoise.Tooptimize per­formancesof the TS7514 operatingin close prox­imity to digital systems, supply and ground noise
shouldbe minimized.

Thisinvolvesattentionto powersupply designand
circuitboard layout.

The power supplies should be bypassedwith tan­talumor electrolyticcapacitorsto obtainnoise free
operation. These capacitors should be located
close to the TS7514. The electrolytic type capaci­tors for improved high frequencyperformance.

Power supplies connections should be short and
direct.Ground loopsshould be avoided.

2N2222

1N4148

+5V

7514-15.EPS

17/19

TS7514

PACKAGE MECHANICALDATA

24 PINS- PLASTICDIP

Dimensions

Min. Typ. Max. Min. Typ. Max.

Millimeters Inches

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

PM-DIP24.EPS

DIP24.TBL

18/19

PACKAGE MECHANICALDATA

28 PINS- PLASTICLEADED CHIP CARRIERPLCC)

TS7514

Dimensions

Min. Typ. Max. Min. Typ. Max.

Millimeters Inches

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

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for anyinfringement of patents or other rights of third parties whichmay 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.STMicroelectronicsproductsare notauthorizedfor use ascriticalcomponentsinlifesupport devicesor systems
without express written approval of STMicroelectronics.

Purchase of I

Rights to use these components in aI

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.

The ST logo is a registered trademark of STMicroelectronics

 1998 STMicroelectronics - All Rights Reserved

2

C Components of STMicroelectronics, conveys a license under the PhilipsI2C Patent.

2

C StandardSpecifications as defined by Philips.

the I

STMicroelectronics GROUP OF COMPANIES

2

C system,is granted provided that the system conformsto

http://www.st.com

19/19

PMPLCC28.EPS

PLCC28.TBL