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RG1

IRIG Timecode Receiver and Generator

The RG1 Time Code receiver synchronizes to IRIG-A/B/G time codes and provides precise time in a memory register, for the host SBC.

The IRIG output of the card can be used to synchronize other IRIG time code readers. Additionally, the RG1 includes a real-time clock (RTC) that may be used as a reference source for IRIG master applications, to free the system processor from the task of updating the master timer.

The most common format is IRIG-B, but the module can also support IRIG-A and IRIG-G formats as well.

Features
  • Analog Input, AM ASK IRIG Receiver (Formats A, B or G): Signal level to 0.5 to 10 Vpp; 3:1 modulation ratio; Zin: 20k or 50 ohm, selectable; Isolated input (high CMR limited only by isolation)
  • Node Capacity (maximum): 3-Node; 2 x 3 ports and 1 x 2 ports
  • Digital Input IRIG Receiver (Formats A, B or G): DCLS; Isolated input
  • Analog Output, AM ASK IRIG Generator(Formats A, B or G): Configurable signal level (0 to 18 Vpp for high-Z or 0 to 9 Vpp for 50 ohm load); Modulation ration: 3:1
  • Digital Output IRIG Generator (Formats A, B or G): DCLS encoding; Signal Level: RS0232 or RS-422/485
  • IRIG Generator (Formats A, B or G): 10 MHz Reference output (RS-422)
  • 1-PPS Output (RS-232 or RS-422) Digital Output
  • Real-Time Clock (RTC): May be used as a reference source for an IRIG master
  • Event Input Signal: RS-232 or RS-422/485
  • Built-in Test & Functions: Over-current protection/status

Specifications
  • Supported IRIG Protocols: A000, A001, A002, A003, A004, A005, A006, A007, A130, A131, A132, A133, A134, A135, A136, A137, B000, B001, B002, B003, B004, B005, B006, B007, B120, B121, B122, B123, B124, B125, B126, B127, G001, G002, G005, G006, G141, G142, G145, G146
  • IRIG AM input or Output: Formats A, B, G
  • IRIG AM input signal level: 0.5 to 10 Vp-p
  • IRIG AM input modulation ratio: 3:1
  • IRIG AM input impedance: 20k or 50 ohm, selectable
  • IRIG AM output signal level: 0 to 9 V p-p min. (50 Ω load) or 18 V p-p min. (hi-Z load); configurable in 256 steps
  • IRIG AM output modulation ratio: 3:1
  • IRIG DCLS Input or Output: Formats A, B, G
  • IRIG DCLS input decoding: DCLS (DC level shift) decoding
  • IRIG DCLS output encoding: DCLS (DC level shift) encoding
  • IRIG DCLS input or output signal level: RS-232 or RS-422*/485
  • 10 MHz reference output: RS-422*
  • External 1PPS output: RS-232 or RS-422*
  • External 1PPS output Pulse Width: 1 ms – 100 ms, configurable
  • Event Input, GPIO: RS-232/422*/485, configurable. Captures the time on the rising or falling edges. This transition will also generate an interrupt.
  • Isolation: Module power source (ISO-GND) and I/O to system ground is ≥500 VDC
  • Power: 5 VDC / 850 mA (max); ±12 VDC @ 20 mA (max est.)
  • Weight: 1.5 oz. (42 g)
Product Specifications (Continued)
Reference Synchronization Accuracy  The reference accuracy and 1PPS output for AM inputs when slaved to a reference source should fall within:
  • Format A: ±4 ppm (±4us) 
  • Format B: ±20 ppm (±20us) 
  • Format G: ±500 ppb (±500ns) 

The reference accuracy and 1PPS output for DCLS inputs when slaved to a reference source should fall within:
 All formats: ±100 ppb (±100ns)  

The reference accuracy and 1PPS output for GPS inputs (not applicable to RG1) when slaved to a reference source should fall within:   ±100 ppb (±100ns)

Free-Running Drift/Accuracy  The drift per second when free-running after losing lock with an AM reference source input should fall within:
  • Format A: ±8 ppm/sec (±8 us/sec)
  • Format B: ±40 ppm/sec (±40 us/sec)
  • Format G: ±750 ppb/sec (±750 ns/sec) 

The drift per second when free-running after losing lock with an DCLS reference source input should fall within:
 All formats: ±280 ppb/sec (±280 ns/sec)  

The drift per second when free-running after losing lock with a GPS reference source (not applicable for RG1) should fall within:  ±280 ppb/sec (±280 ns/sec)

(All) specifications pending design verifications and qualification. Specifications listed are defined at/to the module boundary.

*RS-422 Hardware Interface: Effectively implemented by programming the channel(s) for RS-485 differential signal level AND programming receiver input termination (120 ohms).

Block Diagram

(Click diagram to enlarge)

Documentation
9/20/2022 5:25:02 AM
9/20/2022 5:25:45 AM
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