TCM3105

TCM3105DWE TI | Alldatasheet

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TCM3105DWE, TCM3105DWL,TCM3105JE TCM3105JL, TCM3105NE, TCM3105NL FSK MODEM 02862, NOVEMBER 1985—REVISED DECEMBER 1990 @ Single-Chip Frequency-Shift-Keying (FSK) J OR N PACKAGE Modem (TOP VIEW) U e Moers Both Bell 202 and CCITT V23 Vpo 9 tel) osc2 pectic cikfj2 ssfJosci @ Transmit Modulation at 75, 150, 600, and cot 3 14{] TXD 1200 Baud RXA 4 13]] TXR1 . © Receive Demodulation at 5, 75, 150, 600, TSS ta XRD and 1200 Baud megs 4 TxA RXB [}7 10f] COL @ Half-Duplex Operation Up to 1200 Baud RXO [] 8 of] Vss Transmit and Receive e Fa Duplex Operation Up r 1200 Baud DW PACKAGE ransmit a jaud Receive (rop view) @ On-Chip Group Delay Equalization and wo, Transmit/Receive Filtering Voo Yt 24f] osc2 | Ps eik2 = 2sflosci @ Carrier-Detect-Level Adjustment and Carrier- cor lls 221] TxD Fail Output nc4 = aifJnc @ Single 5-V Power Supply RXA [5 201} TXR1 c i nc [Je 191] NC @ Low Power Consumption trs (17 taf] NC @ Reliable CMOS Silicon-Gate Technology NC Ye 17f] TXR2 RXT [Jo 16[] TXA NCf}10 15] NC RXBEj11 taf] COL RXD[}12_—13f) Vss NC—No internal connection D packages are available taped and reeled. Add ““R” suffix to device type (e.g., TCM3105DWLR) dy, AN Caution. These devices have limited built-in gate protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.

description

The TCM3105 is a single-chip asynchronous Frequency Shift Keying (FSK) voiceband modem that uses silicon gate CMOS technology to implement a switched capacitor architecture. It is pin selectable (TXR1, TXR2, and TRS inputs) for a wide range of transmit/receive baud rates and is compatible with the applicable BELL 202 or CCITT V23 standards. Operation is fully reversible, thereby allowing both forward and backward channels to be used simultaneously. The transmitter is a programmable frequency synthesizer that provides two output frequencies (on TXA), representing the ‘marks’ and ‘spaces’ of the digital signal present on the TXD input. The receive section is responsible for the demodulation of the analog signal appearing at the RXA input and is based on the principle of frequency-to-voltage conversion. This section contains a group delay equalizer (to correct phase distortion), automatic gain control, carrier detect level adjustment, and bias distortion adjustment, thereby optimizing performance and giving the lowest possible bit error rate. rr Earvont ar of publication dete Predaenseeratae Copyright © 1990, Texas Instruments Incorporated hacessarily include testing of all parameters INSTRUMENTS POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 2-97 waw.chipdocs .com Be sure to visit ChipDocs web site for more information.

TCM3105DWE, TCM3105DWL,TCM3105JE TCM3105JL, TCM3105NE, TCM3105NL FSK MODEM al description (continued) Carrier-detect information is given to the system by means of the carrier-detect circuits, which set a flag on the CDT output if the level of received in-band energy falls below a value set on the CDL input for a specified minimum duration. The TCM3105DWE, TCM3105JE, and TCM3105NE are characterized for operation from — 40°C to 85°C. The TCM3105DWL, TCM3105JL, and TCM3105NL are characterized for operation from 0°C to 70°C. TERMINAL FUNCTIONS ee [cot | 14 | 10 _| Cavier Detect Level Adjust for extemal adjustment of caver detect Wesholg =| [cot [3 [3 J Carrier Detect Output. A low-level output indicates carrier fare Db rate pe PSS [emmwem 18,19, 21 external clock is used, OSC2 is left open and the clock is connected to OSC1. [axa | 5 | 4 | Receive Ansiog Input to which the received ine signal must be ac coupled __——+| minimize bias distortion [roe |e [wmgeerm eee is a mark and the low logic level is a space. [ax |8 |= | Receive test access. Output of liter is avaiable on ths pin (Wen) =i [mf | t [waiwesngece rates and mark/space frequencies [-Txa_[ 16 [11 _| Transmit Analog Output for the modulated signal which must be ec coupled | Transmit Digital Input for input data to the transmitter in positive logic. The high logic level is a TXD mark and the low logic level is a space. The data can be accepted at any speed from zero to the selected speed and may be totally asynchronous. [rm [|e [ingens nn eR DR Se ent | frequencies froma [| [Rgecen en e eeeeene frequencies [vss 13 | 9 | Most negative suppiy voltage (normaly groundi; connected to subewate SSCS a TEXAS % INSTRUMENTS 2-98 POST OFFICE 8OX 655303 * DALLAS, TEXAS 75265 waw.chipdocs .com Be sure to visit ChipDocs web site for more information.

TCM3105DWE, TCM3105DWL,TCM3105JE TCM3105JL, TCM3105NE, TCM3105NL re functional block diagram TRANSMIT TRANSMIT DIGITAL Nor ‘rien. me ourur INPUT CONVERTER OUTPUT RECEIVE BIAS apsust PXB RECEIVE RECEIVE COMPARATOR/—AXD DIGITAL ANALOG RXA womens RECEIVE COMPARATOR FSK OUTPUT INPUT iad FILTER PEMODULATOR NO AUTOMATIC Sevay OFFSET RECEIVE GAIN EQUALIZER COMPEN- ttt ta RT TEST CONTROL SATION Dw PACKAGE) ACCESS ONLY CARRIER CARRIER. CARRIER-DETECT oe DETECT CDT DETECT LEVEL oy DELAY ouTPUT ADJUST oscittator Josct 4.4336 MHz CONNECTIONS 5 ose OSCILLATOR TIMING BITRATE JTXA1 AND CLK CLOCK SELECT Jrxaz. CONTROL TRANSMIT/ TRS RECEIVE STANDARD SELECT timing diagram RXA INPUT (AMPLITUDE OF RECEIVED SIGNAL) | OFF-‘ON THRESHOLD —— - - ON-OFF THRESHOLD 1 1 ! { cor \\ Ht ttlon-ott ouTeuT ' ' ta(ott-on) f¢—>| 1 1 1 i 1 t Sh Texas aa INSTRUMENTS POST OFFICE BOX 655303 + DALLAS, TEXAS 75265 2-99 waw.chipdocs .com Be sure to visit ChipDocs web site for more information.

TCM3105DWE, TCM3105DWL,TCM3105JE TCM3105JL, TCM3105NE, TCM3105NL FSK MODEM SSS absolute maximum ratings over free-air operating temperature range (unless otherwise noted) Input voltage, Vj (any input)... ce ete eee ee eee eee eee es =0,3 to VOD Operating free-air temperature range: TCM3105DWL, TCM3105JL, TCM3105DWE, TCM3105JE, NOTE 1: All voltage values are with respect to Vsg. recommended operating conditions TCM3105DWE TCM3105DWL TCM3105JE TOM3105JL. unit TCM3105NE TCM3105NL | MIN NOM MAX| MIN NOM MAX | [ Supply voltage, Vpp CT ET [Analog load impedance aTXA——SSCSC~CSC~‘iSOCSC~dCSCiOSSCSC*dCi TT. TEXAS wy INSTRUMENTS 2-100 POST OFFICE BOX 685303 * DALLAS. TEXAS 75265 waw.chipdocs .com Be sure to visit ChipDocs web site for more information.

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a carrier detector, and control and timing (See Figure 1). FIGURE 1. TCM3105 SYSTEM PARTITIONING The transmitter comprises a phase coherent FSK modulator, a transmit filter, and a transmit amplifier. introduced by the transmit filter clock are removed by a continuous low-pass filter. to 4-wire converter to give a constant output level to the line. squarewave that is presented to the demodulator. The demodulator is an edge-triggered multivibrator that triggers off positive and negative going edges. received frequency and is extracted by a switched-capacitor, low-pass, post-demodulator filter. comparator output is then the received data at the RXD output. waw.chipdocs .com Be sure to visit ChipDocs web site for more information.

TCM3105DWE, TCM3105DWL,TCM3105JE TCM3105JL, TCM3105NE, TCM3105NL FSK MODEM nr carrier detect The carrier detect circuits comprise an energy detector and digital delay. The energy detector compares the total signal level at the output of the receive filter to an externally set threshold level on the CDL input. The comparator has a 2.5-dB hysteresis and a delay to allow for momentary signal loss and to prevent oscillation. The output of the detector is available on the CDT pin where a high level indicates that a carrier is present. The data output is clamped to a MARK condition when the carrier detect output switches off at the end of transmission. control and timing An on-chip oscillator runs from an external 4.4336-MHz crystal connected between the OSC1 and OSC2 pins or an external signal driving OSC1. A clock signal equal to 16 times the highest selected bit rate (transmit or receive) is available on the CLK output. The single-supply rail means that all analog functions are referenced to an internally generated reference. All analog inputs and output must be ac coupled. transmit and receive modes The various modes of operation of the TCM3105 are given in Table 1. The data convention is that a togic high is a mark and a logic low is a space. a Eee TEXAS ap INSTRUMENTS POST OFFICE BOX 655303 - DALLAS, TEXAS 75268 2-103 waw.chipdocs .com Be sure to visit ChipDocs web site for more information.

TABLE 1. MODES OF OPERATION tin these modes, the modulation is controlled by the TRS and TXR2 pins. TXD is tied high. wew.chipdocs com Be sure to visit ChipDocs web site for nore infornation.

TCM3105DWE, TCM3105DWL,TCM3105JE TCM3105JL, TCM3105NE, TCM3105NL FSK MODEM ———— eee

APPLICATION INFORMATION

Vopp. Vss. OR CLK TRS Voo Voo TXA TXD LINE 2WIRE LINE a TERMI- | TO TCM3105 uaART eo MICRO » NATION 4.WiRE FSK MODEM PROCESSOR CONVERTER RXD cuK i cor josc1_osc2_Vss} FF FIGURE 2. TYPICAL SYSTEM CONFIGURATION waw.chipdocs .com Be sure to visit ChipDocs web site for more information.

TCM3105DWE, TCM3105DWL,TCM3105JE TCM3105JL, TCM3105NE, TCM3105NL FSK MODEM eee TRANSMIT TxD = a. 3002 DATA TCM3105 su v : bv pp TX GAIN ADJ ee 100 k2 DL m OT HE 100 ks z= >= TKA CARRIER 100k SELECT TxRI [4] ar MODE TxR2 (BIT RATE [a] [A] AND CLK zu STANDARD) Vss RXA [ay 3 50K8 100k ae RX GAIN ADJ 0.1 uF p sv ; 100 ks 2727 a7 ko LA] 2 20 A7kO sour = UT Liza FIGURE 3. TELEPHONE LINE INTERFACE CIRCUIT waw.chipdocs .com Be sure to visit ChipDocs web site for more information.

TCM3105DWE, TCM3105DWL,TCM3105JE TCM3105JL, TCM3105NE, TCM3105NL FSK MODEM

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= = 100 ko ze ‘OSc1 OSC2 0.1 uF t TXA LN | 27 =600 0 SV 100k2 R 100 kz RxB sv sv Voo LA] 100 k2. coL = TOM3105, 5V LJ aT kn RECEIVE DATA RXD TRANSMIT DATA TxD TXRI STANDARD AND TXR2 0.1 uF a7kn 10 uF BIT RATE TRS RXA <a CARRIER DETECT CDT | Sj = 100k 100 ks cLock cLK Vss zr. Zr wy zz Fa U1 = %LM124 FIGURE 4. SIMPLIFIED TELEPHONE LINE INTERFACE CIRCUIT waw.chipdocs .com Be sure to visit ChipDocs web site for more information.