46
ANET1553
Users
Manual
Time Tagging:
IRIG-B Time Tag
For absolute time tagging, a special time code processor
implements an IRIG-B-122 encoder/decoder. If no external IRIG
source is available a time code in IRIG-B-122 format is generated
and can be used to synchronize multiple boards or modules.
Decoder:
Format
IRIG-B-122
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:
IRIG-B-122
Absolute Accuracy +/-25ppm (standard Oscillator)
Signal Waveform: Amplitude modulated sine wave
Output Amplitude:
~ 4,9V
PP,
High voltage level
Modulation Ratio:
~ 3 : 1
Carrier Frequency
1kHz +/-50ppm
Gap and
Response Time
Measurement
For relative response and inter message gap measurement
(<=100µs) an internal timer is used with 250 ns resolution.
MIL-STD-1553
Bus Front End
The physical I/O Interface with one or two dual redundant
MIL-STD-1553 streams. It consists of the MIL-STD-1553B
transceiver and a respective transformer.
The output voltage of the transceiver is adjustable
Bus coupling modes:
- Transformer coupled
- Direct coupled
- Network coupled (Transformer coupled with on-board
resistor network emulation)
- Isolated
