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Model 470M Time Code/PCM Simulator Mezzanine

Product Support

  • Plug-on option for Acroamatics Model 1602P

  • Provides both Time Code and Format Simulator functions

  • Generates and Translates IRIG A, B, and G time codes

  • Simultaneous time code generation and translation

  • Generates all IRIG standard and randomized PCM codes

  • Generates complex formats with dynamic data and subframes

  • Asynchronous frame insertion and format switching

User's Manual

Technical Manual


Technical Specs

Software & Drivers

Supplemental System Products

1602P PCI Data System

1502V VME Data System



The Model 470M  is a mezzanine card that converts amplitude modulated IRIG time code signals to a digital  representation for downstream analysis. Combines time code translation, generation and format simulation on a single plug-on mezzanine module.  The card also generates an amplitude modulated serial IRIG A, B, or G output for use by external equipment, and a slow code output for annotating strip charts. The Model 470P mezzanine can be attached to either the 1602P or model 502V* VME card. All Acroamatics documentation is supplied on CD-ROM.


* Acroamatics Model 502V is a legacy product.


Technical Specs



 0.5 to 20V p-p, single-ended


12KW (minimum)

Input Codes

 IRIG A, B, or G

Input Frequency

 125Hz to 400kHz

Modulation Index

2:1 through 5:1


Program selectable: normal/inverted

Leap Year

Program selectable: enable resets days to 1 after 366

Internal Time Base

32MHz crystal oscillator


Generate Mode

Program selectable: generates multiples of 4, 2, 1, 1/2, and 1/4 realtime.

Translate Mode

Time read from external source

Translate Carrier Mode

Internal timing clock derived from input carrier. Allows translation to continue as input carrier rate varies during playback of an analog recording.

Translate Failsafe Mode

Internal timing clock is phase-locked to input carrier. Allows translator to generate time in the event of time input dropout. Time is resolved to microseconds for all input code formats. Program selectable: translates at multiples of 4, 2, 1, 1/2, and 1/4 realtime.

Frame Bypass

Automatic frame bypass compares previous time frame to current time frame. Time accumulator is updated on agreement.




BCD time-of-year (days through microseconds) delivered as four 16-bit words at one millisecond and one second intervals

Generator Output

Program selectable: IRIG time codes A, B, and G

Slow Code Output

Datum bi-level or IRIG level shift. Four programmable rates



Format Storage

Stores two complete, selectable PCM formats. Performs asynchronous frame insertion and format switching

Subframe Capability

Generates up to three subframes within mainframe. Can generate a subframe within a subframe

Frame Length

Up to 65,536 words for mainframe and 16,384 words for subframe

Data Sources

1024 static registers

Two user-defined dynamic data memories. Two 16-bit modulo up/down counters.

Two 16-bit external inputs. One 16-bit pseudo-random number generator.

One 16-bit program counter

Word Length

Programmable for each data source: static data words 1 to 32 bits; all others 1 to 16 bits

Word Orientation

 Program selectable: MSB/LSB for each data word

Parity Generation

Program selectable: leading, trailing, or no parity for each data word

Dynamic Data Memories

Two, each with 16KB RAM. Presettable to ramp, sine, triangle and squarewave functions or user-defined input. Selectable data type: 1s complement, 2s complement, signed magnitude, offset binary. Programmable time base.


Bit Rate

Program selectable: 1Hz to 64MHz, tunable to 0.1% of programmed rate


0 clock



Output Codes

Program selectable: NRZ-L/M/S, Bi-L/M/S, DBi-M/S, DM-M/S, MDM-M/S, RNRZ 11/15/17/23

PAM Output

2.5 Volts, balanced output, 10mA drive current

PCM Output

TTL compatible NRZ-L data and 0 clock


Hosts Supported

Plugs onto Model 1502V or 1602P

Cooling Requirements

30 Linear FPM

Power Requirements

+5VDC at 1.1A, +12VDC at 100mA, -12VDC at 100mA. Power supplied by host board


5.9 (14.99cm) H x 3.9 (9.91cm) W x .35 (.89cm) D. Host and module fits in standard slot


Operating 0 to +40C, non-operating 40 to +86C

Relative Humidity

Up to 90% non-condensing


Operating 6G, Non-operating 25G


Operating 0.5G, 5 to 2000Hz, Non-Operating 1.2G, 5 to 500Hz

specifications subject to change without notice

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