Subassembly > VM300PAFF


VME Board


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Model VM300PAFF
Programmble Amplifier/
Fixed Frequency Filter






Frequency Devices' Model VM300PAFF comprises a family of VMEbus amplifier/filter boards offering software programmable differential amplifiers combined with precision 3-pole Butterworth or Bessel linear analog filters in a single width B-size (6U) VME form factor. VM300PAFF boards provide simultaneous access to 32, DC-coupled wideband signals while providing programmable gain from -12dB to +42dB, in 6dB steps and fixed frequency filters with corner frequencies from >100 kHz to 300 kHz. VM300PAFF boards may be configured with 8, 16, or 32 channels. The boards conform to VME revision C.1 as an A16/D16 Slave. Available options include AC coupled input and/or differential output.


  • Simultaneous access over 32 channels offers a low cost, versatile and convenient way to provide amplification and filtering.
  • Three active read/write registers provide programming and set-up verification.
  • Interchannel crosstalk <-100 dB provides precision performance solutions to design engineers, system integrators and OEM's.
  • Three pole Butterworth or Bessel transfer functions with a broad range of corner frequencies to meet a wide range of applications.
  • High channel count density without sacrificing performance maximizes chassis utilization.




  • Sonar, navigation and aerospace
  • Engine test and simulation
  • Acoustic and vibration analysis
  • Satellite and telecommunications
  • Automatic test equipment (ATE)

Amplifier/Filter Options

PGAB5-300   -12 dB to +42 dB in 6 dB steps
    Butterworth 3-pole >100 kHz to 300 kHz
PGAL5-300   -12 dB to +42 dB in 6 dB steps
    Bessel 3-pole >100 kHz to 300 kHz




(@ 25°C and rated power input)

Analog Input
  • Impedance: 1 MΩ // 22pF
  • Maximum Input: ±15V
  • AC Couple (Optional Fixed Freq.):
    10 Hz to 1.0 kHz

Analog Output

  • Impedance: 1.0 Ω typ., 10 Ω max.
  • Linear Operating Range:
    ±5V linear operating range,
    Output clamped to ±9 V
  • Channel to Channel Crosstalk:
    <-100dB @ 1 kHz, <-9OdB @ 20 kHz
  • Maximum Current: 5.0mA
  • Offset Voltage: 2mV RTI, NTE 25mV max.
  • Offset Temp. Coeff., RTI:
    ±(5 +100/G) µV/°C max.

Filter Characteristics

  • Anti-alias filtering: 3-pole low-pass Butterworth or Bessel fixed frequency
  • Cut-off Frequency fc (-3dB):
    Fixed frequency from 100Hz to 300 kHz
  • Amplitude Match*:
    ±0.1dB @ DC, linear to ±0.25dB at fc
  • Phase Match*: 0.5° typ., 2.0° max. @ fc
  • Noise Voltage, RTI:
    20nV/sqrt(Hz) @ 1 kHz, G=128
  • Distortion PGA5, G=1X @ 1Vrms Output, RL=2kohm:
    -83dB, 1 kHz single ended
    -86dB, 1 kHz differential

* Any two channels set to same gain and loading

  • Gain Programming (G): 0.25X to 1024X in factors of 2:1 (before filtering), 32 channels programmed over VMEbus with read-back
  • Gain Accuracy @ DC: ±0.1 dB max.


  • Interface: A16/D16, D08 (EO), Slave
  • Registers: Three active R/W registers in 64 byte blocks

Power Supply

  • From VME Backplane:
    +5V - 1.0A max.
    ±12 V - 0.7A max.


  • 0perating Temperature: 0°C to +70°C
  • Storage Temperature: -25°C to +85°C
  • Humidity: 0-95% non-condensing


  • Card Size: VMEbus 6U single slot,
    9.17 x 6.3 inches, (233 x 160 mm)
  • No. of Input Channels:
    32 Differential - DC coupled
  • No. of Output Channels:
    32 Single Ended - DC coupled,
    Two groups of 16
  • Differential Output (Optional)
  • Mating Connectors:
    • Input: Male high density 78-pin D-sub, Quantity 1
    • Output: Female high density 44-pin D-sub, Quantity 2
  • Weight: 1 LB., (454 grams)

Ordering Information

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Frequency Devices, Inc.
Your engineering partner for signal conditioning
  927 Fosse Rd
Ottawa, IL 61350



Phone: (815) 434-7800

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