Model 472M Bit Synchronizer Mezzanine

Model 472M 32 MHz Bit Synchronizer Mezzanine

Product Support

Tunable data rates from 8Hz to 32MHz for NRZ codes, 8Hz to 16MHz all others

Processes all IRIG standard and randomized codes

Independent encoder with TTL & Bipolar outputs

Technical Manual

Program\User's Manual

Datasheet

Technical Specs

Software & Drivers

Supplemental System Products

● 1601P Bit Synchronizer

● 1602P PCI Data System

● 1502V VME Data System

● Cabling Options

32MHz PCM Bit Synchronizer Mezzanine mounts on Acroamatics 1601P Bit Synchronizer and Acroamatics 1502V PCM Data System to provide additional bit synchronizer capabilities.

Overview

The 472M PCM Bit Synchronizer is a state-of-the-art Bit Synchronizer featuring tunable data rates from 8 Hz to 32 MHz for NRZ codes and 8 Hz to 16 MHz for all others. The card contains selectable input sources, AGC and DC restoration circuitry, and programmable band pass filtering for optimum data recovery. Sophisticated PLL (phase-locked loop) circuitry synchronizes a clock to the incoming signal to extract digital data from the PCM input. This circuitry produces NRZ-L data and clock outputs for use by a PCM format decommutator or similar equipment. It also provides encoded PCM output for analog tape recording. The unit accepts all IRIG standard PCM input codes and has a bit error performance within 1 dB of theoretical. The Model 472M can be attached to either the Model 1602P, 1502V or 1601P cards. All Acroamatics documentation is supplied on CD-ROM.

System Software

GUI Setup and Operation Status of the Model 1601P's and 472M's are controlled via a single interface with drop down menus for individual cards. The software automatically recognizes all of the bit synchronizers as well as their features. Setup configurations can be stored and retrieved for all previous missions as a group or individually. A page lock command accessible via the GUI reminds users before executing new instructions in order to avoid mistakes during a live mission. Remote users can control the units via an Ethernet port. If two users are viewing the system simultaneously, both see the changes made in real time by either user.

Technical Specs

SIGNAL INPUTS
Source	Program select, 1 of 2 inputs
Isolation	Greater than 60dB at 20MHz
Impedance	Program selectable: Hi-Z/Lo-Z. Single Ended: 4kΩ/75Ω
Signal Level	0.2 to 30V p-p
DC Offset	20V max Hi-Z
Baseline Variation	Tracks sinusoidal offsets to 100% p-p signal amplitude at 0.1% bit rate
PCM Codes	Program selectable: NRZ-L/M/S, Bi�-L/M/S, DBi�-M/S, DM-M/S, MDM-M/S, RZ
Derandomizer	Program selectable: RNRZ 9/11/15/17/23, forward/reverse
SYNCHRONIZATION
Bit Rate Range	8bps-32Mbps NRZ codes, 8bps-16Mbps all others
Tuning Resolution	0.1% of bit rate
Capture Range	3 times the programmed loopwidth, typical
Tracking Range	�12% typical, with programmable limiter
Loop Bandwidth	0.1% to 3.2%, program selectable in 0.1% increments
Sync Threshold	0dB for NRZ-L and Bi�-L codes
Sync Maintenance	(LW=0.1%) �2dB NRZ-L and Bi�-L codes
Sync Acquisition	(LW=1.6%, SNR > 12dB) Typically less than 32 bit periods
Sync Retention	(LW=0.1%, SNR > 3dB) Retains sync through > 128 consecutive dropouts
Bit Error Rate	(LW=0.1%) to within 1dB of ideal bit error rate performance curves
DATA/CLOCK OUTPUTS (TAPE & CODE OUTPUTS)
NRZ-L Data	Jumper Select: three TTL, one RS422/TTL
Data Clock	One each: 0�, 90�, 180�, 270�; RS422/TTL at 0� & 90�
Data Polarity	Program selectable: normal/inverted
PCM ENCODER
Data Source	Program selectable: Recovered Data or External data/clock
Outputs	�2 Volts balanced output, 50mA drive current
Randomizer	Program selectable: RNRZ 9/11/15/17/23
PCM Codes	Program selectable: NRZ-L/M/S, Bi�-L/M/S, DBi�-M/S, DM-M/S, MDM-M/S, RZ
EXTERNAL DATA/CLOCK INPUT
Signal Type	Jumper selectable: RS422 or TTL
Impedance	120Ω RS422, 75Ω TTL
Data Code	NRZ-L
Data Clock	Program selectable: Normal/Inverted, 1x or 2x
PHYSICAL
Hosts Supported	Plugs onto Model 1601P or 1502P
Cooling Requirements	30 Linear FPM
Power Requirements	+5VDC at 1.1A, +12VDC at 100mA, -12VDC at 100mA. Power supplied by host board
Dimensions	6.59� (16.51cm) H x 4.0� (10.16cm) W x .50� (1.27cm) D Host and module fits in standard slot
Temperature	Operating 0 to +40�C, non-operating �40 to +86�C
Relative Humidity	Up to 90% non-condensing
Shock	Operating 6G, Non-operating 25G
Vibration	Operating 0.5G, 5 to 2000Hz, Non-Operating 1.2G, 5 to 500Hz
specifications subject to change without notice