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TS7514
PROGRAMMABLE V.23 MODEM WITH DTMF
. . . . . . . . . .
PROGRAMMABLE MODES : - Modem 75bps transmit, 1200bps receive - Modem 1200bps transmit, 75bps receive - DTMF dialing - Call status tone detection - Auxiliary analog transmit input - Analog test loopback PROGRAMMABLE FUNCTIONS : - Transmission level - Hysteresis and detection level - Filters (reception and transmission) - Line monitoring and buzzer - DTMF frequencies FIXED COMPROMISE LINE EQUALIZER AUTOMATIC BIAS ADJUSTMENT INTEGRATED DUPLEXER STANDARD LOW COST CRYSTAL (3.579MHz) TAX TONE REJECTION POWER-UP INITIALIZATION OF REGISTERS OPERATES FROM 5V CMOS
DIP24 (Plastic Package)
PLCC28 (Plastic Leaded Chip Carrier Package)
on a 4-wire line. Its programming concept makes it 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, line monitoring, tone and dialing detection. ORDER CODES
TS7514CP TS7514CFN 0 to 70 C 0 to 70oC
o
DESCRIPTION The TS7514 is an FSK modem which can be programmed for asynchronous half-duplex voiceband communications on a 2-wireline or full duplex 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 23 22 21 20 19 18 17 16 15 14 13 AXTL
DIP24 PLCC28
PLCC28
MOD/DTMF MC/BC ATXL WLO ATO RTS
WLO ATO
N/C
28
27
V+
ENP 5 6 7 8 9 10 11 12 13 14 15 16 17 18 25 24 23 22 21 20 19 V+ AGND VRAO1 RAI1 RAI2 N/C
7514-01.EPS / 7514-02.EPS
AGND VRAO1 RAI1 RAI2 RAO2 RFO
DGND TxD PRD N/C XTAL IN XTAL OUT
N/C
ZCO
RDI
DCD
RFO
RxD
RDI
RAO2
26
4
3
2
1
November 1998
1/19
7514-01.TBL
Part Number
Temperature Range
Package
TS7514
PIN DESCRIPTION
Name MOD/DMTF Pin Number DIP24 1 PLCC28 1 MODEM or DMTF Operating Mode Selection. Also controls write operations to control registers (if MOD/DMTF = 0 and MC/BC = 0). 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. Request to Send. 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 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 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. Digital Ground = 0V. All digital signals are referenced to this pin. Digital Input for Transmit or Control Data Digital Input for Control Data. Selected through ENP Crystal Oscillator Input. Can be tied to an external clock generator. fQUARTZ = 3.579MHz. Crystal Oscillator Output Data Carrier Detect Output Digital Receive Data Output Zero Crossing Rx Digital Output (ringing detection) Analog Output for the Receive Signal after Filtering or Analog Input for the Amplifier-limiter. Analog Receive Filter Output A2 Amplifier Output A2 Amplifier Inverting Input A1 Amplifier Inverting Input A1 Amplifier Output Negative Supply Voltage : - 5V 5% Analog Ground = 0 V. Reference Pin for Analog Signals Positive Supply Voltage : + 5V 5% Analog Transmit Output Analog Output for Line Monitoring and Buzzer Direct Analog Input Transmit Filter
7514-02.TBL
Description
MC/BC
2
3
RTS
3
4
ENP DGND TxD PRD XtaIIN XtaIOUT DCD RxD ZCO RDI RFO RAO2 RAI2 RAI1 RAO1 VAGND V+ ATO WLO ATxI
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
5 6 7 8 10 11 13 14 15 16 17 18 20 21 22 23 24 25 26 27 28
2/19
TS7514
Figure 1 : Simplified Block Diagram
ATxI V+ DGND VAGND
TS7514
ATTENUATOR TxD Tx DATA CARRIER/TONE FREQUENCY GENERATOR Tx FILTER ATO
DMTF DATA
PRD
INPUT SHIFT REGISTER
ENP
CONTROL REGISTERS
MODE CONTROL
RTS MC/BC MOD/DTMF
TO PROGRAMMABLE FUNCTIONS
BUZZER
ATTENUATOR
WLO
DCD
CARRIER/TONE LEVEL DETECTOR
RAI1 RxD RX DATA FSK DEMODULATOR G Rx FILTER G RAO1 DUPLEXER RAI2 RAO2 ZCO
MASTER CLOCK
CLOCK GENERATOR
7514-03.EPS
Xtal OUT
Xtal IN
RDI
RFO
3/19
TS7514
FUNCTIONAL DESCRIPTION The TS7514 circuit is an FSK modem for half-duplex, voice-band asynchronoustransmissions on a 2-wire line according to CCITT recommendation V.23 or full duplex on 4 wire-line. The circuit features DTMF dialing, call status tone detection and line monitoring in both dialing and automaticanswer modes. A signalling frequency is available at the line monitoring output (buzzer). Ring detection is possible by using the signal detection function and bypassing the receive filter. The receive signal at ZCO output can be filtered in the associated microprocessor. The TRANSMIT channel (Tx) includes : - Two programmable frequency generators. - One switched capacitor filter (SCF) with low-pass or bandpass configuration and its associated propagation delay corrector. - One continuous time low-pass smoothing filter. - One attenuator, programmable from 0 to + 13dB by 1dB steps. - One programmable analog input. The RECEIVE channel (Rx) includes : - Two operational amplifiers for duplexer implementation. - One continuous time low-pass anti-aliasing filter. - One programmable gain amplifier. - One linear compromise equalizer. - One switched capacitor band pass filter (can be set to either main or back channel). - One continuous time low pass smoothing filter. - One limiting amplifier. - One correlation demodulator. - One programmable level signal detector. Figure 2 : Internal Control Register
RTS
The LINE MONITORING channel includes : - One buzzer. - One 3-channel multiplexer to select beetwen : - Transmit channel monitoring. - Receive channel monitoring. - Buzzer. - One programmable attenuator Internal Control Power-up Initialization The TS7514includes power-up initializationof 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 Writeaccess to the DTMF data registerand to other control registers is achievedin serial mode through TxD input or PRD input. Addressing of these 4 bit registers is indirect. They are accessed through an 8 bit shift register addressedwhen MOD/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 by the MSB's) is started by the operating mode (MODEM or DTMF) selection (MOD/DTMF = 1 or MC/BC = 1).
CLK TxD or PRD 8-BIT SHIFT REGISTER (Input Register) Datas 4-Bit Control Register RPROG RDTMF RATTE RWLO RPTF RHDL RPRX RPROG
7514-04.EPS
Addresses
MOD/DTMF MC/BC RTS TxD or PRD
D0 D1 D2 D3 D4 D5 D6 D7
Data Time
Address
4/19
ATxL
TS7514
Mode
MX MX RC ATT
ATO
TxD SCF RATTE
FREQUENCY GENERATOR MX
CORR SCF
PRD
Figure 3 : Detailed Block Diagram
ENP
MX
Address RDTMF 4-bit Bus RPTF RWLO
RTS
MC/BC RHDL BUZZER RPRX RPRF
SERIAL INPUT REGISTER AND DATA CONTROL MX
Data WLO ATT RAI1 A1 Analog Loop RAO1 RAI2 A2 G RC
MX
MOD/ DTMF
Mode RPROG
DCD
CARRIER LEVEL DETECTOR
Mode
RxD
FSK DEMODULATOR
CORR SCF
G SCF TIME BASE Internal Clocks RC
MX RAO2
ZCO
5V
0V
0V
-5V
RDI
RDO
XTAL OUT
XTAL IN
V+
AGND
DGND
V-
TS7514
5/19
7514-05.EPS
TS7514
OPERATING MODES The various operating modes are defined by MC/BC and MOD/DTMF inputs, and by the content of a control register RPROG. The TS7514 includes 8 control registers. Access to each control register is achieved through an auxilliary 8-bit shift register (input register). The input of that shift register is connected either to TxD or PRD, depending upon the statusof theENP control pin (ie when ENP = 0 and ENP = 1 respectively). In both cases, the RTS input receivesthe shift clock and sequentialy transfer is controlled by setting simultaneously MOD/DTMF and MC/BC to 0. The
MOD/DTMF 1 1 0 0 MC/BC 1 0 1 0 Transmission (ATO) MODEM, Main Channel MODEM, Back Channel DTMF
previous internal status and data are memorized during loading of the input register so that transmission continues properly. That feature allows the user to modify transmission level or line monitoring selection during transmission. The transmit channel operatingmode (Modem main or back channel, DTMF) can only be modified when RTS = 1. When RTS = 0, the ATO transmit output is enabled and the preselected operatingmode is activated. When RTS returns to 1, Modem or DTMF transmission is inhibited after the first zero crossing of the generated signal.
Reception (RxD, DCD)
MODEM, Back Channel MODEM, Main Channel DCD= Active Tone Detection (270 -500Hz) if RTS = 1... DCD = 1 if RTS = 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 demodulator output is shifted, so that RxD changes from 0 to 1 at 1950Hz instead of 1700Hz.
MODEM TRANSMISSION FREQUENCIES
Modulation Rate 75bps 1200bps TxD 1 0 1 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 Error (Hz) +0.09 +0.45 -0.24 -0.88
DTMF TRANSMISSION FREQUENCIES
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 5120 4640 4192 3808 2960 2680 2420 2200 Error (%) +0.31 +0.19 +0.22 -0.10 +0.03 -0.03 +0.15 +0.36
6/19
TS7514
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.
Modulation Ratio 1200bps 75bps (Note 1) DCD Transition t1 t2 t1 t2 10 5 0 15
The detector has an hysteresis effect : N1 - N2. - Timing Detection Requirements Signal detection time constants at the DCD output comply with CCITT Recommendation V.23.
Min. 10 5 15 15 Max. 20 15 40 40 CCITT V.23 (max) 20 15 80 80 Unit ms ms ms ms
CCITT V.23 (min)
Note 1 : wide band Rx filter used (see Figure 7c).
Figure 4 : Signal Detection Time Out
N1
LINE
N1 0V
DCD
t1
t2
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.
PROGRAMMING REGISTER (RPROG)
Address D7 X D6 0 D5 0 D4 0 D3 0 0 0 0 0 0 1 X X X X 0 1 X Data D2 D1 0 1 0 1 X X X D0 0 1 1 0 X X X Selected Mode (note 1) The most significant bit (D7) is not used when decoding control register addresses. Control register addressing is enabled when D7 = 0 (see note 2). Control register addressing is enabled when D7 = 1 (see note 2). Reception positioned in the channel opposite tothe transmission channel controlled by MC/BC Reception positioned in the same channel as transmission (see note 3). 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.
7/19
7514-06.EPS
TS7514
DTMF DIALING DATA REGISTER (RDTMF REGISTER)
D7 P Address D6 D5 0 0 D4 1 D3 X X X X 0 0 1 1 Data D2 D1 X 0 X 0 X 1 X 1 0 X 1 X 0 X 1 X Tone Frequency (Hz) D0 0 1 0 1 X X X X Low 697 770 852 941 X X X X High X X X X 1209 1336 1477 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 REGISTER FOR THE TRANSMISSION ATTENUATOR (RATE REGISTER)
D7 P Address D6 D5 0 1 D4 0 D3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 Data D2 D1 0 0 0 0 0 1 0 1 1 0 1 0 1 1 1 1 0 0 0 0 0 1 0 1 1 0 1 0 1 1 1 1 D0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Attenuation (dB) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Infinite Infinite* Output Transmit Level (dBm) +4 +2 +1 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 < - 64 < - 64 * On Line Level (dBm) Coupler Gain (- 6dB) -2 +3 -4 -5 -6 -7 -8 -9 - 10 - 11 - 12 - 13 - 14 - 15 < - 70 < - 70 *
* Power-up configuration.
LINE MONITORING PROGRAMMING REGISTER (RWLO REGISTER)
Address D7 P D6 0 D5 1 D4 1 D3 0 0 0 0 0 0 0 0 1 1 1 1 1 Data D2 0 0 0 0 1 1 1 1 0 0 0 0 1 D1 0 0 1 1 0 0 1 1 0 0 1 1 X D0 0 1 0 1 0 1 0 1 0 1 0 1 X Line Monitoring In Transmit Mode Relative Level (dB) - 10 - 20 - 31 - 42 0 - 10 - 20 - 31 0.42 VPP - 10dB - 20dB - 31dB < - 60dB* Line Monitoring In Receive Mode Relative Level (dB)
* Power-up configuration. Note : Signaling frequency is a square wave signal at 2982Hz.
8/19
TS7514
RECEIVE FILTER SELECTION AND GAIN PROGRAMMING REGISTER (RPRF REGISTER)
Address D7 P D6 1 D5 0 D4 1 D3 X X X X X X 1 X X X X 0 1 X Data D2 D1 0 0 1 1 X X X D0 0 1 0 1 X X X Reception Gain (dB) (note 1) 0 +6* + 12 0 X X X Rx Channel Band = Tx Channel B and Tx to Rx Loopback - 33dBm Rx Level 40dBm Receive Filter Selected Receive Filter Desabled Receive F ilter Disconnected from RDI Output and from Demodulator. Offset Disabled. Comments
* Power-up configuration. Note 1 : Depending on the line length, the received signal can be amplified. Programmable reception gain allows a level close 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 D7 P D6 1 D5 0 D4 0 D3 0 0 0 0 0 1
* Power-up configuration.
Data D2 0 0 0 0 1 0 D1 0 0 1 1 0 0 D0 0 1 0 1 0 0
ATO Transmission MODEM or DTMF Signal* ATxI via Smoothing Filter and Attenuator ATxI via Low-pass Filter and Attenuator ATxI via Band-pass Filter and Attenuator In DTMF Mode, Transmision of High Tone Frequency In DTMF Mode, Transmission of Low Tone Frequency
HYSTERESIS AND SIGNAL DETECTION LEVEL PROGRAMMING REGISTER (RHDL REGISTER)
Address D7 P D6 1 D5 1 D4 0 D3 X X X X X X X X 0 1 0 0 0 0 1 1 1 1 X X Data D2 D1 0 0 1 1 0 0 1 1 X X D0 0 1 0 1 0 1 0 1 X X N2 (dBm) (note 1) See Figu re 4 - 43 * - 41 - 39 - 37 - 35 - 33 - 31 - 29 X X N1/N2 (dB) X X X X X X X X 3* 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
RECEIVE CHANNEL PROGRAMMING REGISTER (RPRX REGISTER)
Address D7 P D6 1 D5 1 D4 1 D3 X X X X X X X X Data D2 D1 0 1 X X D0 X X 0 1 Configuration Low Frequency Wide Band Selected (Figure 7b) (Note 1) Low Frequency Narrow Band Selected (Figure 7c) Carrier Level Detector Delay Enabled* Carrier Level Detector Delay Disabled.
Note 1 : In active tone detection mode (MOD/DTMF = O, 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 = O or 1) the RPRX register indicates again the value programmed before the active tone detection mode.
INPUT SHIFT REGISTER ACCESS Figure 5 : 1st Case : Programmation without Data Transmission
1 2
RTS
3 6 4 4 5 9
MC/BC and MOD/DTMF
7
8
TxD or PRD
Figure 6 : 2nd Case : Programmation with TxD During Data Transmission
RTS 6 MC/BC and MOD/DTMF 11 11 10 5
TxD or PRD
D0
D7
10/19
7514-08.EPS
Data n1
Data n
Data n
7514-07.EPS
TS7514
ABSOLUTE MAXIMUM RATINGS
Symbol DGND V+ V- VI V in Io Iout Ptot Top Tstg Tlead Parameter DGND (digital ground) to AGND (analog ground) Supply Voltage V+ to DGND ro AGND Supply Voltage V- to DGND or AGND Voltage at any Digital Input Voltage at any Analog Input Current at any Digital Output Current at any Analog Output Power Dissipation Operating Temperature Storage Temperature Lead Temperature (soldering, 10s) Value - 0.3, + 0.3 - 0.3, + 7 - 7, + 0.3 DGND - 0.3, V+ + 0.3 V- 0.3, V + + 0.3 - 20, + 20 - 10, + 10 500 0, + 70 - 65, + 150 + 260 Unit V V V V V mA mA mW C C C
7514-03.TBL 7514-05.TBL 7514-04.TBL
If the Maximum Ratings are exceeded, permanent damage may be caused to the device. This is a stress rating only, and functional operation of the device under these or any other conditions for extended periods may affectdevice reliability. Standard CMOS handling procedures should be employed to avoid possible damage to the device.
ELECTRIC OPERATING CHARACTERISTICS
Symbol V+ V- I+ IPositive Supply Voltage Negative Supply Voltage V+ Operating Current V- Operating Current Parameter Min. 4.75 - 5.25 - - 15 Typ. 5 - 5.0 10 - 10 Max. 5.25 - 4.75 15 - Unit V V mA mA
DC AND OPERATING CHARACTERISTICS Electrical characteristics are guaranteed over the complete temperature range, with typical load unless otherwise specified. Typical values are given for : V+ = +5V, V- = -5V and room temperature = 25oC
Symbol VI L VI H II L II H IOL IOH Vin Iin C in R in V OS CL RL Vout Rout - Parameter Input Voltage, Low Level Input Voltage, High Level Input Current, Low Level Input Current, High Level Output Current, Low Level Output Current, High Level Input Voltage Range Input Current (filter output selected) Input Capacitance (ATT output selected) Input Resistance (ATT output selected) Output Offset Voltage Load Capacitance Load Resistance Output Voltage Swing Output Resistance ATO Attenuation Ratio when RTS = 1 DGND < Vi < VIL (max) VIH (min) < VI < V+ VOL = 0.4V VOH = 2.8V Test Conditions Min. - - 2.2 - 10 - 10 1.6 - - 1.8 - 10 - 100 - 250 - - - 1.8 10 70 Typ. - - - - - - - - - - - - 560 - - - Max. 0.8 - 10 10 - - 250 + 1.8 + 10 20 - + 250 100 - + 1.8 25 - Unit V - A A mA A V A pF k mV pF V dB DIGITAL INTERFACE (MOD/DTMF, RTS, DCD, RxD, ZCO, TxD, MC/BC, ENP, PRD)
ANALOG INTERFACE-PROGRAMMABLE (ATxl)
ANALOG INTERFACE - TRANSMIT OUTPUT (ATO) (load conditions RL = 560, CL = 100pF)
11/19
TS7514
DC AND OPERATING CHARACTERISTICS (continued) Electrical characteristics are guaranteed over the complete temperature range, with typical load unless otherwise specified. Typical values are given for : V+ = +5V, V- = -5V and room temperature = 25oC
Symbol Parameter Test Conditions Min. Typ. Max. Unit ANALOG INTERFACE - LINE MONITORING (WLO (load conditions , RL = 10k, C L = 50pF) VOS CL RL Vout Rou t - Output Offset Voltage Load Capacitance Load Resistance Output Voltage Swing Output Resistance WLO Attenuation Ratio - 250 - 10 - 1.8 - 70 - - - - - - + 250 100 - + 1.8 15 - mV pF k V dB
ANALOG INTERFACE - DUPLEXER (RAI+, RAI-, RA0) Vin lin Cin Voff Vout CL RL G CMRR PSRR Vout CL RL AVO Input Voltage Range RAI+, RAI- Input Current RAI+, RAI- Input Capacitance RAI+, RAI- Input Offset Voltage RAI+, RAI- Output voltage Swing, RA0 Load Capacitance RA01 Load Resistance RA01 DC voltage Gain in Large Signals, RA01 Common Mode Rejection Ratio, RA01, RA02 Supply Voltage Rejection Ratio, RA01, RA02 Output Voltage Swing, RA02 Load Capacitance, RA02 Load Resistance, RA02 DC Voltage Gain in Large Signals, RA02 CL = 50pF, RL = 10k C L = 100pF, RL = 300 C L = 100pF RL = 300 C L = 100pF -2 -10 - -20 - - - - +2 +10 10 +20 V A pF mV V V pF dB dB dB pF pF k dB
-1.8 RL = 600+1.8 - -0.9 - +0.9 - 300 60 60 60 -2.5 - 10 - - - - - - - - - 100 - - - - 2.5 50 - -
ANALOG INTERFACE-RECEIVE FILTER OUTPUT (RFO) Amplifier Limiter Input (RDI) Vin Rin Cin CL RL Vout Rou t tCYC (1) Pwel (2) PWeh (3) tr, tf (4) tHCE (5) tSCE (6) tSDI (7) tHDI (8) tWW (9) tBD (10) tHD (11) 12/19 Input Voltage Range (RPRF = 1 xxx) Input Resistance (RPRF = 1 xxx) Input Capacitance (RPRF = 1 xxx) Load Capacitance (RPRF = 1 xxx) Load Resistance Output Voltage Swing Output Resistance C L = 50pF, RL = 1.5k - 2.2 1.5 - - 1.5 - 1.8 - - - - - - - - + 2.2 - 20 50 - + 1.8 15 V k pF pF k V ns ns ns ns ns ns ns ns ns ns
7514-06.TBL
DYNAMIC CHARACTERISTICS FOR PROGRAMMING REGISTER ACCESS (see Figures 5 and 6) Cycle Time Pulse Width, RTS Low Pulse Width, RTS High RTS Rise and Fall Times Control Input Holding Time Control Input Setup Time TxD or PRD Input Setup Time TxD or PRD Input Hold Time TWW Input Writing Inpulsion Width (high level) TxD Input Setup Time TxD Input Hold Time 600 300 300 - 100 300 200 100 300 100 100 - - - - - - - - - - - - - - 50 - - - - - - -
ns
TS7514
DC AND OPERATING CHARACTERISTICS (continued) Electrical characteristics are guaranteed over the complete temperature range, with typical load unless otherwise specified. Typical values are given for : V+ = +5V, V- = -5V and room temperature = 25oC
Symbol GAR GHH Parameter Absolute Gain at 2100Hz Gain Relative to Gain at 1700Hz Test Conditions Min. - Band-pass < 390Hz = 390Hz = 450Hz = 1100Hz Band-pass or Low-pass 1100Hz to 2300Hz 3300Hz 5800Hz > 16000Hz - - - - 0.5 - 0.5 - - - 90 1.04 0.3 - 0.5 70 0.8 390Hz 450Hz 1300Hz 2100Hz +3.5 +3.5 +3.5 +3.5 -3 +1.5 - - 0.5 < 150Hz 150Hz to 450Hz 1300Hz 2100Hz 2300Hz 5500Hz to 10000Hz > 10000Hz - - - 0.5 1.1 - - - 0.5 - - - 0.5 - - - - 0.5 - - - 0.5 - - - - Typ. Max. Unit 0 - - - - - -3 - - - - 0 - - - - - - - - - - - 1.8 - - - - - - - - - - - - - - - - - - - - 30 - 35 - 35 +0.5 +0.5 - - 15 - 35 110 1.08 0.3 +0.5 1.2 +4.5 +4.5 +4.5 +4.5 - 1.5 +2.5 250 + 0.5 - 60 - 50 0.5 2.3 2.7 - 50 - 60 + 0.5 - 50 + 0.5 + 0.5 + 0.5 - 50 - 60 + 0.5 - 50 + 0.5 + 0.5 + 0.5 - 50 - 60 300 dB dB dB dB dB dB dB dB dB s ms dB dB dB dB dBm dBm dBm dBm dBm dB V dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB V 13/19 TRANSMIT FILTER TRANSFER FUNCTION (load conditions : RL = 560, CL = 100pF)
D AR
Group Delay (modem transmission) Main Channel : from 380 to 460Hz Back Channel : from 1100 to 2300Hz Absolute Gain for 0dB Programmed Attenuation Relative to Programmed Value Attenuation for Programmed Value = Relative Attenuation between two Consecutive Steps Modem Amplitude (Att = 0dB)
ATTENUATOR TRANSFER FUNCTION ATT R AT R LT
TRANSMIT GENERAL CHARACTERISTICS
DTMF Amplitude (Att = 0dB) - Low Frequency Group - Low Frequency Group versus Low Frequency Group Psophometric Noise RECEIVE FILTER TRANSFER FUNCTION GAR GRR Absolute Gain at 1100Hz - Main Channel (0dB programmed) Gain Relative to the Gain at 1300Hz (0dB programmed)
GAR GR R
Absolute Gain at 420Hz (back channel - narrow band) (0dB programmed) Gain Relative to Gain at 420Hz (0dB programmed)
< 150Hz 380Hz 400Hz to 440Hz 460Hz 1100Hz to 10000Hz > 10000Hz
GAR GR R
Absolute Gain at 425Hz (tone detection or back channel wide band) (0dB programmed) Gain Relative to Gain at 425Hz (0dB programmed)
Psophometric Noise
7514-07.TBL
< 112Hz 275Hz 300Hz to 525Hz 575Hz 1375Hz to 10000Hz > 10000Hz
TS7514
DC AND OPERATING CHARACTERISTICS (continued) Electrical characteristics are guaranteed over the complete temperature range, with typical load unless otherwise specified. Typical values are given for : V+ = +5V, V- = -5V and room temperature = 25oC
Symbol Parameter Test Conditions Min. Typ. Max. Unit RECEIVE TRANSFER - GENERAL CHARACTERISTICS Absolute Filter Gain for : 0dB programmed 6dB programmed 12dBprogrammed R DS R HY Signal Detection Level Relative to Programmed Value Hysteresis Value Signal Level (loop 3) at Reception Input dB - 0.5 + 5.5 + 11.5 - 0.5 -2 - 40 - - - - - - 35 + 0.5 + 6.5 12.5 + 0.5 - - 33 dB dB dBm
LINE MONITORING - GENERAL CHARACTERISTICS (load conditions : RL = 10k, CL = 50pF) ATT RAT FS Absolute Gain for 0dB Programmed Attenuation Relative to Programmed Value Attenuation for Programmed Value Buzzer Signalling Frequency Signalling Frequency Amplitude at 0.42VPP Programmed - -1 70 - 0.38 0 - - 2982 0.42 - +1 - 0.46 dB dB dB Hz VPP
7514-08.TBL
14/19
TS7514
Receive Filter Transfer Characteristics Figure 7a : Main Channel
0 -10
Transmission Spectrum At the ATO output, the out-of-band signal power conforms to the following specifications :
GAIN (dB)
-20 -30 -40
0dB
-50 -60 -70
7514-09A.EPS
25dB
f(kHz)
1 10
100
7514-10.EPS
55dB 3.4 4 16 200
0.1
FREQUENCY (kHz)
Figure 7b : Back Channel - Narrow Band
0 -10
GAIN (dB)
-20 -30 -40
-50 -60 -70
7514-09B.EPS
Receiver Measurement conditions Local transmit level : -10dBm on lower channel at 75bps. Receive level : -25dBm, with 511 bit pseudo-random test pattern. Test equipment : TRT sematest. Isochronous distortion The following table shows typical isochronous distortion obtained with the TS7514 circuit :
Line Line 1 (fiat) Line 2 Line 3 Line 4 Reception (1200) 10 % 12 % 18 % 14 % Reception (75) 4% 4% 6% 6%
0.1
1
10
10 0
FRE QUENCY (kHz)
Figure 7c : Basic Channel Wide band and Tone Detection
0 -10
GAIN (dB)
-20 -30 -40
Bit error rate Typical bit error rates versus while noise are as follows (noise and signal levels are measured without weighting on the 300/3400Hz) :
Reception (1200) S/N Line 1
7514-09C.EPS
Reception (75) S/N - 3 dB - 3 dB - 3 dB - 3 dB BER 2.10 -3 2.10 -3 2.10
-3
-50 -60 -70
0.1 1 10
10 0
BER 2.10
-3
6 dB 7 dB 8 dB 7 dB
Line 2 Line 3 Line 4
2.10 -3 2.10 2.10
-3 -3
FRE QUENCY (kHz)
2.10 -3
15/19
TS7514
CHARACTERISTICS OF TEST LINES Figure 8
CCETT LINE (FLAT) 10 ms 2 10
Figure 9
CCETT LINE 2 (10%) ms 2
5 5 1
1
0
7514-11.EPS
0
7514-12.EPS
0 0 1 2 3 kHz
0
0
1
2
3 kHz
Figure 10
CCETT LINE 3 (90%) 20 15 10 5 0 0 1 2 3 kHz ms 4 3 2 1 0
Figure 11
CCETT LINE 2 (10%) 20 15 10 5 0 0 1 2 3 kHz ms 4 3 2 1 0
16/19
7514-13.EPS
7514-14.EPS
TS7514
TYPICAL APPLICATION INFORMATION
+5V
-5V
10F
10F
+
External Signal 100nF
+
1F (*)
100nF
1.5k
ATxI
V+
GNDD GNDA
V-
RAO1
560 TxD U.A.R.T. CTP 120 (670 90003) Transfo. (EMT L 162)
L1/TPH1 TRISIL (TPA 270A 18) L2
C
PRD RTS
O
N
T
M.C.U.
MOD/DTMF
ENP
RAO2
12k
MC/BC
T S 7 5 1 4
ATO
18k 12k
560
RxD
RAI1
270k
TPH2
RAI2
100nF
R
39k
WLO
RFO RDI
XTAL OUT XTAL IN 6.8k
To Loudspea ker Amplifier
O
L
S
ZCO
12pF
(LS04)
12pF
EXTAL
2N2222
4.7k
1N4148
3.579MHz
2.2F
DCD
(*) : RegulationRequired in France Only
+5V
POWER SUPPLIES DECOUPLING AND LAYOUT CONSIDERATIONS Power supplies to digital systems may contain high amplitude spikes and other noise. To optimize performances of the TS7514 operating in close proximity to digital systems, supply and ground noise should be minimized. This involves attentionto powersupply design and circuit board layout. The power supplies should be bypassed with tantalum or electrolytic capacitors to obtain noise free operation. These capacitors should be located close to the TS7514. The electrolytic type capacitors for improved high frequency performance. Power supplies connections should be short and direct. Ground loops should be avoided.
17/19
7514-15.EPS
TS7514
PACKAGE MECHANICAL DATA 24 PINS - PLASTIC DIP
Dimensions a1 b b1 b2 D E e e3 F I L
Min.
Millimeters Typ. 0.63 0.45 1.27
Max.
Min.
Inches Typ. 0.025 0.018 0.050
Max.
0.23
0.31 32.2 16.68 2.54 27.94 14.1 4.445 3.3
0.009
0.012 1.268 0.657 0.100 1.100 0.555 0.175 0.130
DIP24.TBL
15.2
0.598
18/19
PM-DIP24.EPS
TS7514
PACKAGE MECHANICAL DATA 28 PINS - PLASTIC LEADED CHIP CARRIER PLCC)
Dimensions A B D D1 D2 E e e3 F F1 G M M1
Min. 12.32 11.43 4.2 2.29 0.51 9.91
Millimeters Typ.
Max. 12.57 11.58 4.57 3.04 10.92
Min. 0.485 0.450 0.165 0.090 0.020 0.390
Inches Typ.
Max. 0.495 0.456 0.180 0.120 0.430
1.27 7.62 0.46 0.71 0.101 1.24 1.143
0.050 0.300 0.018 0.028 0.049 0.045
PLCC28.TBL
0.004
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 previously supplied. STMicroelectronics products are not authorized for use as critical comp onents in lifesupport devicesor systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 1998 STMicroelectronics - All Rights Reserved Purchase of I2C Components of STMicroelectronics, conveys a license under the Philips I 2C Patent. Rights to use these components in a I 2C system, is granted provided that the system conforms to the I2C Standard Specifications 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 - United Kingdom - U.S.A. http://www.st.com
19/19
PMPLCC28.EPS

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