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ACT4489 Datasheet(PDF) 1 Page - Aeroflex Circuit Technology |
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ACT4489 Datasheet(HTML) 1 Page - Aeroflex Circuit Technology |
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1 / 7 page  CIRCUIT TECHNOLOGY www.aeroflex.com/act1.htm eroflex Circuit T echnology – Data Bus Modules For The Future © SCD4489 REV A 1/29/98 General Description The Aeroflex Circuit Technology ACT 4489 is a next generation monolithic transceiver design which provides full compliance to MIL-STD-1553A/B and 1760 requirements in a small package with low power consumption. The ACT 4489 series performs the front-end analog function of inputting and outputting data through a transformer to the MIL-STD-1553 data bus. Design of this transceiver 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. Transmitter: The Transmitter section accepts bi-phase TTL data at the input and when coupled to the data bus with a 1:1 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 Volts P-P at point 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, an overriding “INHIBIT" input provides Block Diagram (Without Transformer) ACTIVE OUTPUT STAGE COMP. COMP. REFERENCE ACTIVE FILTER INPUT AMPLIFIER DRIVER TX DATA IN TX DATA IN TX INHIBIT IN RX DATA IN RX DATA IN RX STROBE IN TX DATA OUT TX DATA OUT RX DATA OUT RX DATA OUT FILTER -12V (VEE) GND3 +5V (VL) GND1 +12V (VCC) GND2 CASE Features • +5 / ±12 Volt Supply Operation • Low Power Dissipation • Small Size & Light Weight • Outstanding MIL-STD-1553 performance • Radiation Hard Dielectric Isolation Monolithic Construction for Severe Environments • Superior High Frequency Line Transient and Input Ripple Rejection • Input and Output TTL Compatible Design • Processed and Screened to MIL-STD-883 Specs • MIL-PRF-38534 Compliant Devices Available ACT 4489 SINGLE TRANSCEIVER FOR MIL-STD-1553/1760 |
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