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ACE1553-3U-4 Hardware Manual
24
Bus Front-End of MIL-STD-1553:
The physical I/O Interface comprises a one/two dual redundant MIL-STD-1553
stream(s). It consists of the MIL-STD-1553 trapezoidal transceiver and a
respective transformer.
The output voltage of the transceiver is programmable (separate for primary
and secondary channel): app. 0V … >21V
PP
transformer coupled into 70Ω.
Programmable Bus Coupling options:
Transformer coupled
Direct coupled
Transformer coupled with on-board network emulation
Isolated
Time Tagging:
IRIG B Time Tag
For absolute time tagging, a special time code processor implements an IRIG-B
encoder/decoder. If no external IRIG-B source is available a time code in IRIG
B format is generated and can be used to synchronize multiple boards or
modules.
Decoder:
Resolution:
1 µs
Width:
1 Year (46 Bit)
Signal Waveform:
Amplitude modulated sine wave or square wave
Modulation Ratio:
3:1 to 6:1
Input Amplitude:
0.5V
p-p
to 5V
p-p
Input Impedance:
> 10k ohm
Coupling:
AC coupled
Time Jitter:
+/- 5µs (depending on the input signal quality)
Lock time:
< 5s
Free-wheeling accuracy after 10 Minutes < 1ppm (assuming input signal
accuracy better than 50ppm)
Encoder:
Format:
AIM Standard (based on IRIG B format)
Absolute Accuracy:
+/-25ppm (standard Oscillator)
Signal Waveform:
Amplitude modulated sine wave
Output Amplitude:
~ 3 V
p-p,
High voltage level
Modulation Ratio:
~ 3.2 : 1
Carrier Frequency:
1kHz +/-50ppm
Connectors:
Summary of Contents for ACE1553-3U-4
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