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| ACT 4455 / 4459 SINGLE SUPPLY TRANSCEIVERS FOR MIL-STD-1553/1760 Features * Single 5 Volt Supply Operation * Low Power Dissipation * Small Size & Light Weight * Single Transceiver Save Space & Cost * Outstanding MIL-STD-1553 performance * Processed and Screened to Mil-STD-883 Specs * Radiation Hard Dielectric Isolation Monolithic construction for Severe Environments * Superior High Frequency Line Transient and Input Ripple Rejection * Input and Output TTL Compatible Design * DESC SMD# 5962-96741 General Description: The Aeroflex Circuit Technology ACT4455 / 4459 series are next generation monolithic transceiver designs which provides full compliance with MIL-STD-1553A/B and 1760 requirements in the smallest packages with low power consumption and single power supply operation. The ACT4455 / 4459 series performs the front-end analog function of inputting and outputting data through a transformer to the MIL-STD-1553 data bus. Design of these transceivers reflects particular attention to active filter performance. This results in low bit and word error rate with superior waveform purity and minimal zero crossover distortion. Efficient transmitter electrical and thermal design provides low internal power dissipation and heat rise at high as well as low duty cycles. www.aeroflex.com/act1.htm CIRCUIT TECHNOLOGY TX DATA OUT TX DATA IN TX DATA IN DRIVER ACTIVE FILTER OUTPUT STAGE TX DATA OUT Transmitter: The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:2.5 ratio transformer, isolated on the data bus side with two 52.5 Ohm fault isolation resistors, and loaded by two 70 Ohm terminations, the data bus signal is typically 7.5 Volts P-P at A-A' (See Figure 5). When both DATA and DATA inputs are held low or high, the transmitter output becomes a high impedance and is "removed" from the line. In addition, TX INHIBIT RX DATA OUT COMP. +5 V REFERENCE +5V RTN RX DATA IN RX DATA IN INPUT AMPLIFIER ACTIVE FILTER RX DATA OUT COMP. STROBE Block Diagram (without Transformer) eroflex Circuit Technology - Data Bus Modules For The Future (c) SCD4455 REV A 1/29/98 an overriding "INHIBIT input provides for the removal of the transmitter output from the line. A logic "1" applied to the "INHIBIT" takes priority over the condition of the data inputs and disables the transmitter. (See Transmitter Logic Waveform, Figure 1.) The Transmitter may be safely operated for an indefinite period with the bus (point A-A') short circuited at 100% duty cycle. and produces two TTL signals at the output. The outputs are DATA and DATA, and represent positive and negative excursions of the input beyond a pre-determined threshold.(See Receiver Logic Waveform. Figure 2.) The pre-set internal thresholds will detect data bus signals exceeding 1.20 Volts P-P and reject signals less than 0.6 volts P-P when used with a transformer. (See Figure 5 for transformer data and typical connection.) A low level at the Strobe input inhibits the DATA and DATA outputs. If unused, a 2K pull-up to +5 Volts is recommended Receiver: The Receiver section accepts bi-phase differential data at the input Figure 1 -- Transmitter Logic Waveforms Idealized* DATA IN DATA IN INHIBIT LINE TO LINE OUTPUT Note: DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them, and must be in the same state during off times (both high or low). Figure 2 -- Receiver Logic Waveforms Idealized* LINE TO LINE INPUT STROBE DATA OUT DATA OUT Note overlap * See Figure 8 For Actual Waveforms Aeroflex Circuit Technology 2 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700 Absolute Maximum Ratings Operating case temperature Storage case temperature Power supply voltage Logic input voltage Receiver differential input Receiver input voltage (common mode) Driver peak output current Total package power dissipation over the full operating case temperature rise Maximum junction to case temperature Thermal resistance - junction to case -55C to +125C -65C to +150C -0.3 V to +7.0 V -0.3 V to +5.5 V 10 V 5 V 600 mA 2 Watts (Note: Normal operation conditions require one transceiver on and the other off.) 10C 5C/W Electrical Characteristics -- Driver Section Input Characteristics, TX DATA in or TX DATA in (Notes 2 & 3 apply) Parameter "0" Input Current "1" Input Current "0" Input Voltage "1" Input Voltage Condition VIN = 0.4 V VIN = 2.7 V Symbol IILD IIHD VILD VIHD Min Typ -0.2 1 Max -0.4 40 0.7 Unit mA A V V 2.0 Inhibit Characteristics "0" Input Current "1" Input Current "0" Input Voltage "1" Input Voltage Delay from TX inhibit, (01) to inhibited output Delay from TX inhibit, (10) to active output Differential output noise, inhibit mode Differential output impedance (inhibited) Note 1 VIN=0.4V VIN=2.7V IILI IIHI VILI VIHI tDXOFF tDXON VNOI ZOI 2K 2.0 250 150 2 350 250 10 -0.2 1.0 -0.4 40 0.7 mA A V V nS nS mVP-P Output Characteristics Differential output level Rise and fall times(10% to 90% of P-P output) Output offset at point A-A' on Figure 5, 2.5S after midpoint crossing of the parity bit of the last word of a 660S message Delay from 50% point of TX DATA or TX DATA input to zero crossing of differential signal RL=35 RL=35 VO tr VOS 120 6 100 7.5 200 9 300 90 250 VP-P nS mV peak nS tDTX Note 1. Power on or off, measured from 75KHz to 1MHz at point A-A' and transformer self impedance of 3K minimum Aeroflex Circuit Technology 3 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700 Electrical Characteristics -- Receiver Section Parameter Differential Receiver Input Voltage Range (See Figure 5, point P-P') Common Mode Rejection Ratio (Note 3) Condition TXFMR 2.12:1 Symbol VIDR CMRR Min Typ 14 Max 20 Unit VP-P dB 45 Strobe Characteristics (Logic "O" Inhibits Output) "0" Input Current "1" Input Current "0" Input Voltage "1" Input Voltage Strobe Delay (Turn-on or Turn-off) VS=0.4 V VS=2.7V IIL IIH VIL VIH tSD 2.0 50 100 -0.2 1 -0.4 +40 0.7 mA A V V nS Threshold Characteristics (Sinewave Input) Input Threshold Voltage (referred to the bus) 100KHz-1MHz VTH 0.60 0.82 1.10 V P-P Output Characteristics - RX DATA and RX DATA "1" State "0" State Delay, (average) from Differential Input Zero Crossings to RX DATA and RX DATA Output 50% points IOH = -0.4 mA IOL = -4.0 mA VOH VOL tDRX 2.5 3.7 0.35 340 0.5 500 V V nS Power Data Power Supply Currents - Per Channel Transmitter Standby 25% duty cycle Note 4 50% duty cycle 100% duty cycle ICC 18 150 300 600 30 175 mA 350 700 Power Supply Voltage Operating Power Supply Voltage Range VCC +4.75 +5.00 +5.50 V Note 2: Vcc = 5 Volts 0.1 V, bypassed by 2.2 F (Tantalum recommended) Capacitor minimum. All measurements & specifications apply over the temperature range of -55C to +125C (case temperature) unless otherwise specified. Note 3: When measured at point A-A' with 10 Volt peak, line to ground, DC to 2MHz Note 4: Typical power is measured with Vbus at point A-A' = 7.5 VP-P Aeroflex Circuit Technology 4 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700 Figure 3 - Transmitter (TX) Output Wave form Figure 4 - Transmitter (TX) Output offset LAST BIT tf* 90% Magnified View OUTPUT OFFSET* 6V P-P MIN 9V P-P MAX 0 Volts 0 volts OUTPUT OFFSET* 10% 2.5 sec tr* * Rise and fall times measured at point A-A' in Figure 5 Figure 5 - Typical direct transformer connection 70 70 *Offset measured at point A-A' in Figure 5 Figure 6 - Power Dissipation vs. Duty Cycle (Total hybrid with one channel transmitting and the other not powered) 2000 1800 POWER DISSIPATION MILLIWATTS N1:N2 TX DATA OUT P B 52.5 A Center Tap N1:N3 for Stub Coupling 1600 1400 1200 1000 800 600 400 200 Maximum Typical TX DATA OUT RX DATA IN RX DATA IN P' B' 52.5 A' Transformer turns ratios: N1:N2 = 1:2.5 N1:N3 = 1:1.77 Use Technitrol 1553-45 or equivalent 0 0 10 20 30 40 50 60 70 80 90 100 DUTY CYCLE - PERCENT Note:Vcc=5 Volts,Transformer ratio 1:2.5, Vbus (pt A-A') at 7.5 Volts P-P Aeroflex Circuit Technology 5 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700 Figure 8 ACTUAL HYBRID WAVEFORMS* -- 25C TYPICAL START OF WORD - 33 WORD TRANSMISSION TX DATA IN CH 2 BUS OUT Point A-A' See Figure 5 CH 1 RX DATA OUT CH 3 RX DATA OUT CH 4 END OF WORD - 33 WORD TRANSMISSION TX DATA IN CH 2 BUS OUT Point A-A' See Figure 5 CH 1 RX DATA OUT CH 3 RX DATA OUT CH 4 * Oscilloscope used is a TEK TDS540 with Probe 6139A. Aeroflex Circuit Technology 6 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700 Figure 7 - Pin Numbers & Functions ACT4455/4459 Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Function TX DATA OUT +5V +5V TX DATA OUT TX DATA OUT GROUND 1 NC NC +5V RX DATA OUT STROBE NC RX DATA OUT NC +5V GROUND 3 NC RX DATA IN RX DATA IN NC NC GROUND 4 +5V INHIBIT TX DATA IN TX DATA IN GROUND 2 TX DATA OUT Aeroflex Circuit Technology 7 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700 CIRCUIT TECHNOLOGY Configurations and Ordering Information DESC No. 5962-96741 5962-96741 Model No. ACT 4455 ACT 4459 Receiver Data level Normally Low Rx Normally High Rx Case LCC LCC Configuration Single Single ACT4455/4459 LCC LEADLESS CHIP CARRIER 0.055 0.045 0.055 0.045 0.028 0.022 0.055 0.045 0.458 0.442 0.458 0.442 0.100 MAX Notes 2. Pins are equally spaced at 0.1000.002 tolerance, non-cumulative, each row Aeroflex Circuit Technology 35 South Service Road Plainview New York 11830 Specifications subject to change without notice. Aeroflex Circuit Technology Telephone: (516) 694-6700 FAX: (516) 694-6715 Toll Free Inquiries: 1-(800)THE-1553 8 SCD4455 REV A 1/29/98 Plainview NY (516) 694-6700 |
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