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| CT1698 MIL-STD-1397 Type E 10MHz Low Level Serial Interface Features * * * * * * * * * * * * Optional transformer isolation Internally set threshold Matched to 50 ohm system impedance power on and off Operates with 5 volt supplies Power management External output level adjustment Accepts synchronous input data Unique Manchester decoder requires no clock Generates one clock per received bit May be used for serial decoding of indefinite word lengths Interfaces directly to the CT2500 protocol device Other Wire and Fiber Optic types available CIRCUIT TECHNOLOGY www.aeroflex.com A E RO F LE X LA C ISO 9001 E RTIFIE D B S I NC . General Description CT1698 is a single hybrid microcircuit which incorporates a serial encoder, transceiver, and Manchester decoder in one package. The encoder accepts serial NRZ data in conjunction with two synchronous clocks. The CT1698 receiver section accepts bipolar Manchester encoded signals and passes level detected signals to the serial decoder. The CT1698 has a power management function and a variable drive level option. The transmitter standby mode is available to reduce the overall power consumption of the CT1698. The variable drive level output is externally programmable for testing purposes. Aeroflex Circuit Technology is a 80,000 square foot MIL-PRF-38534 certified facility in Plainview, N.Y. Serial NRZ Data 10 MHz Shift Clock 20 MHz Gated Clock Envelope Master Reset Encoder Enable Power Management Power Management Decoded Data Envelope Manchester Decoder and Clock Regeneration ClockR Decoded DataR Data Reconstruction Serial Manchester Encoder Drive 1 XFMR SEC/DATA Input XFMR SEC +5V Primary Data Output Primary Data Output XFMR SEC XFMR SEC/DATA Input Drive 2 Rx Strobe Figure 1 - Block Diagram eroflex Circuit Technology - Data Bus Modules For The Future (c) SCDCT1698 REV A 6/12/98 Transmission The CT1698 accepts synchronous NRZ Data in conjunction with two clocks signals. The NRZ data stream is then converted to Manchester code which is transformer coupled to a 50 ohm Tri-axial cable for transmission up to 1000 ft. The transmitter may be placed into standby condition. This reduces power consumption by approximately 600mW. Power management is made available via two standard TTL input pins. The Receiver is always active and is not affected by the power management circuitry. The drive level of the transmitter may be changed by adding external resistors to the drive pins. These pins allow the designer to externally program the transmitter output level from 0.7 to 2.8 Volts peak to peak. The transceiver is matched for 50 ohm operation over a wide band of frequencies. This condition is maintained with power on and off. Reception The CT1698 receiver section accepts a bipolar signal which is level detected and passed to the serial decoder. The decoder section reconstructs the data and strips the clock from the serial stream. An NRZ decoded data stream is then produced synchronously with a recovered clock. The receiver is designed to meet the MIL-STD-1397 Type E requirements. Electrical Requirements The specification detailed herein encompasses a hybrid Transceiver/Encoder-Decoder designed to meet the requirements of the MIL-STD-1397 Type E. The transceiver is transformer coupled to the specified triaxial cable. See Figure 1 for Block Diagram. Inputs and Outputs are all Synchronous NRZ DATA STREAMS. The transformer is internal to the package with its use being optional. Encoding Timing / Transmitter Specification Symbol Encode Timing t1 t2 t3 t4 t5 t6 tw1 tw2 Output Signals Va T Ts Te T/2 Tr Tf Vs Tos Tdtx Zo Aeroflex Circuit Technology Parameter / Condition Min Typ Max Unit Input data set-up time Encode clock set-up time Encode envelope set-up time Encode envelope turn-off time Transmitter activation set-up time Transmitter deactivation hold-time 20 MHz gated CK pulse width high Encoder shift CK pulse width high Output amplitude (see Figure 2) Pulse period Width of 1st positive half bit Width of last half bit Half pulse period Pulse rise time Pulse fall time Voltage overshoot Offset Voltage 2T after last zero crossing Delay from 20 MHz clock input to data output on TXFMR secondary Output Impedance 2 10 10 10 10 100 50 20 45 .45 97 45 47 47 .05 .05 50 .7 100 40 40 40 35 ns ns ns ns ns ns 30 55 .8 103 65 65 53 .3 .3 100 30 20 55 55 ns ns V ns ns ns ns V/ns V/ns mV mV ns 45 50 SCDCT1698 REV A 6/12/98 Plainview NY (516) 694-6700 Aeroflex Circuit Technology BIT 0 NRZ Serial Input t1 BIT 1 BIT 2 BIT N P1 = 50ns 0.1% P2 = 100ns 0.1% Encoder Shift Clock Input t2 t W2 P2 20 MHz GATED Clock t3 NRZ Envelope 3 t W1 P1 t4 t5 Encoder Enable Power Management Pin Tf t6 2T Transmitter Output T dTX Va VS V US 10% 10% Te TOS 90% 90% T SCDCT1698 REV A 6/12/98 Plainview NY (516) 694-6700 T/2 T Tr Figure 2 Encoder - Transmitter Timing 1st Data BIT Manchester II Receiver Data t1 2nd Data BIT 3rd Data BIT 4th Data BIT 5th Data BIT Decoded Data Envelope R X Data Data R CK R t6 t5 t7 t2 t3 t4 t5 Figure 3 Receiver / Decode Timing Symbol Parameter / Condition Min Nom Max Units t1 t2 t3 t4 t5 t6 t7 t8 Envelope delay time Data decode delay Clock low transition delay ClockR high time ClockR low time Envelope off delay Receiver strobe enable to input data set-up time Receiver strobe disable to input data hold-time 35 35 120 5 20 115 130 50 50 - 100 125 65 65 270 nsec nsec nsec nsec nsec nsec nsec ? Power Management Functional Table Encoder Enable (Pin 10) Power Management Input (Pin 9) Receiver Status Transmitter Status 0 X 1 0 1 X Active Active Active Standby Active Active Power management timing see Figure 2. Aeroflex Circuit Technology 4 SCDCT1698 REV A 6/12/98 Plainview NY (516) 694-6700 Drive Level Control Pins External Resistors may be connected from pins 5 and 6 to VEE or GND to change the Transmitter Output Level. If pins 5 and 6 are left open the CT1698 operates within the MIL-STD-1397 Type E specification. Resistors connected from pins 5 and 6 to VEE or Ground must be equal. Unequal resistors will result in a transmitter output offset level. The formula for peak to peak transmitter output swing with resistors connected between 5 and 6 to VEE is: VOUT pk-pk = 1.39 + 125 15% Volts, REXT REXT > 90 The formula for peak to peak transmitter output swing with resistors connected between pins 5 and 6 to ground is: VOUT pk-pk = 1.39 - 50 (VEE -2.5) 15% Volts, REXT REXT > 180 Functional Description and Pinout Pin # Pin Name Function Load or Drive 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 XFMR primary/ TX data output XFMR secondary TXDATA output/ RX data input No connection Drive 2 Drive 1 -5 Volts RX strobe Power management input Encoder enable Case/signal GND Case/signal GND Decoded data envelope TP3 test point TP1 test point TP2 test point -5 Volts TP4 test point ClockR No connection Decoded DataR Transformer lead for connection to center conductor of tri-axial cable Secondary isolated winding, same phase as center conductor Transmitter-receiver I/O pin (usually connected to pin 2) Output level adjustment selected by resistor to GND or VEE Output level ajustment selected by resistor to GND or VEE Low level disables receiver Controls transmitter power consumption in conjunction with pin 10 Controls transmitter power consumption in conjunction with pin 9 3 S loads 1 S load 1 S load High after reception of first half bit; goes low after reception of last half bit (normally low in inactive state) Alignment point: no electrical connection permitted Alignment point: no electrical connection permitted Alignment point: no electrical connection permitted Alignment point: no electrical connection permitted Reconstructed clock; one clock pulse per input bit received NRZ reconstructed data. Sampled on clockR rising edge 5 4 S drive 3 S drive 3 S drive Aeroflex Circuit Technology SCDCT1698 REV A 6/12/98 Plainview NY (516) 694-6700 Functional Description and Pinout (continued) Pin # Pin Name Function Load or Drive 22 23 24 25 26 27 28 No connection +5 volts +5 volts 10 MHz encoder shift clock Encode envelope 20 MHz gated clock (encoder) One cycle required per data bit. Must be high in first half of bit cell 1 S load 1 S load 1 S load 1 S load NRZ serial input data Serial input to be Manchester encoded with the 20 MHz gated CK Must be high to enable transmission; must go low before reception of last 20 MHz positive edge to complete transmission Each bit to be encoded requires two positive edges of the 20 MHz CK. These edges must occur at 25ns and 75ns into the bit cell. The end of transmission requires an additional edge in conjunction with a logic low on the encode envelope. tR, tF < 5nsec. Logic low resets encoder 29 30 31 32 33 34 Master reset reset pulse <15 nsec No connection No connection TXDATA output/ RX DATA input XFMR secondary XFMR primary/ TX DATA output 2 S load Transmitter-Receiver I/O pin (usually connected to pin 33) Secondary isolated winding, same phase as outer signal conductor Transformer lead for connection to outer signal conductor of tri-axial Load and Drive Definitions 1 S load: requires IIL = -2mA max., VIL = 0.8V max IIH = 50A max., VIH = 2.5V min CIN < 15 pf 1 S drive: IOH = 50A min., VOH = 2.5V min IOL = -2 mA min., VOL = 0.5V max Power Consumption Current (mA) Typ ICC Standby mode IEE Standby mode ICC 100% Transmission IEE 100% Transmission 325 85 380 125 Max 450 105 510 160 Absolute Maximum Ratings VCC (Pins 23, 24) +7 Volts Max VEE (Pins 7, 17) -7 Volts Max Logic Input Voltage Applied: Logic Low -1.2V @ 10mA Max Logic High +5.5 Volts When used with the internal transformer, the CT1698 will not be damaged by cable open circuits or by short circuits of the following types: * Line-to-line * Line-to-ground * To voltage sources of 0 to 115 volts alternating current, 60 hertz, line-to-ground Environmental Parameters Operating Temperature -55C to +100C Case Storage Temperature -55C to +150C Screened per individual test methods of MIL-STD-883 Aeroflex Circuit Technology 6 SCDCT1698 REV A 6/12/98 Plainview NY (516) 694-6700 CIRCUIT TECHNOLOGY Ordering Information Model Number CT1698 CT1698FP Package Plug-in Package Flat Package Plug-In Package Outline 1.200 .005 Pin 1 & ESD Designator 1.810 MAX .200 .270 .010 .100 .005 TYP .018 .002 DIA (17 Pins/Side) .100 TYP Both Sides .120 .010 Both Sides Flat Package Outline .015 .003 .100 .005 .400 MIN .180 MAX 1.410 MAX Lead 1 & ESD Designator 1.810 MAX .010 .002 Aeroflex Circuit Technology 35 South Service Road Plainview New York 11830 Specifications subject to change without notice. Aeroflex Circuit Technology 7 Telephone: (516) 694-6700 FAX: (516) 694-6715 Toll Free Inquiries: 1-(800)THE-1553 SCDCT1698 REV A 6/12/98 Plainview NY (516) 694-6700 |
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