Model 472M Bit Synchronizer Mezzanine

Model 474DM 40 MHz Advanced Digital Bit Synchronizer Mezzanine

Product Support

Range quality noise and filtering performance in a mezzanine module

Tunable data rates from 8Hz to 40MHz ALL Codes

Processes all IRIG standard and randomized codes

Two independent encoders, with TTL & Bipolar outputs

Options include Viterbi and Frame Sync Verify / Bit Error Rate Test

Technical Manual

Program\User's Manual

Datasheet

Technical Specs

Software & Drivers

Supplemental System Products

● 1611P Bit Synchronizer

● 1602P PCI Data System

● 1626P VME Data System

40MHz PCM Bit Synchronizer Mezzanine mounts on Acroamatics 1611P Bit Synchronizer and Acroamatics 1602P Single Board TM Processor to provide additional bit synchronizer capabilities.

Overview

The 474M PCM Bit Synchronizer is a new, state-of-the-art compact size Digital Bit Synchronizer mezzanine daughter module intended for use with a variety of compatible Acroamatics full-size PCI Telemetry Processing and Bit Sync modules. The 474DM features a range of advanced functional and performance features. Rates a tunable from 8 Hz to 40 MHz for ALL codes, with excellent lock/stability/noise performance characteristics. The card contains selectable input sources, AGC and DC restoration circuitry, and programmable Digital 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 outputs suited to use with data recording, best source select, encrypt/decrypt equipment, and a range of other instruments / applications. The unit accepts all IRIG standard PCM input codes and has a bit error performance better than 1 dB of theoretical, in all modes and data rates of operation. The Model 474DM can be attached to either the Model 1602P, 1626P or 1611P cards. All Acroamatics documentation is supplied on CD-ROM.

System Software

GUI Setup and Operation Status of the Model 1611P's and 474DM'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, with Differential RS-422 support on request
Signal Level	0.2 to 24V 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-40Mbps ALL codes
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 0.5 dB of ideal bit error rate performance curves, in all modes and at all rates
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 1611P, 1602P or 1626P
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