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ARX4868 Datasheet(PDF) 2 Page - Aeroflex Circuit Technology |
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ARX4868 Datasheet(HTML) 2 Page - Aeroflex Circuit Technology |
2 / 6 page Aeroflex Circuit Technology SCD4808 REV A 3/9/98 Plainview NY (516) 694-6700 2 receivers, the data bus signal produced is 7.5 volts minimum 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, 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 Waveforms, Figure 1.) The transmitter utilizes an active filter to suppress harmonics above 1 MHz to meet Macair specifications A-3818, A-4905, A-5232 and A-5690. The transmitter may be safely operated for an indefinite period at 100% duty cycle into a data bus short circuit. Receiver The Receiver section accepts bi-phase differential data at the input 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 Waveforms, Figure 2.) The internal threshold is nominally set to detect data bus signals exceeding 1.05 Volts P-P and reject signals less than 0.6 volts P-P when used with a 1:1 turns ratio 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 DATA IN DATA IN INHIBIT LINE TO LINE OUTPUT NOTES: 2. DATA and DATA inputs must be complementary waveforms or 50% duty cycle average, with no delays between them. 3. DATA and DATA must be in the same state during off time (both high or low). Figure 1 Transmitter Logic Waveforms Figure 2 Receiver Logic Waveforms Note overlap NOTE: Waveforms shown are for normally low devices. For normally high receiver output devices, the receiver outputs are swapped as shown by the dashed lines level LINE TO LINE INPUT DATA OUT DATA OUT 1. Line to line waveforms illustrate Macair signals, MIL-STD-1553 signals are trapezoidal |
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