Subassembly > VM32FF


VME Board


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Model VM32FF
1 Hz to 100 kHz
Fixed Frequency Filter VME Board






Frequency Devices model VM32FF comprises a family of VMEbus filter boards offering 32 channels of fixed frequency, linear analog filtering in a single width B-sized (6U) form factor. VM32FF boards receive up to 32 high level differential signal inputs through a shielded front panel connector and provide signal buffering and unity gain for each channel (optional - customer specified gain). Boards may be configured with 2-pole D72 or 4-pole D74 filters from 1.0 Hz to 100.0 kHz, and with high-pass or low-pass (anti-alias) transfer functions allowing user to externally cascade filters into band-pass configurations. Each channel provides low harmonic distortion and wide signal-to-noise ratio to 12 bit resolution.


  • Simultaneous access over 32 channels offers a low cost, versatile and convenient way to provide amplification and filtering.
  • Interchannel crosstalk <-80 dB provides precision performance solutions to design engineers, system integrators and OEM's.
  • 2- and 4-pole Butterworth or Bessel transfer functions with a broad range of corner frequencies are offered to meet a wide range of applications.
  • High channel count density without sacrificing performance maximizes chassis utilization.


  • Industrial process control
  • Engine test and simulation
  • Acoustic, vibration analysis & control
  • Satellite and telecommunications
  • Automatic test equipment (ATE)
  • Aerospace, navigation & sonar
  • Automotive test cells




  D72L2B 2-pole Butterworth
  D72L2L 2-pole Bessel
  DP72L2B 2-pole Butterworth (1 Hz to 5 kHz)
  DP72L2L 2-pole Bessel (1 Hz to 5 kHz)
  D74L4B 4-pole Butterworth
    D74L4L 4-pole Bessel
    DP74L4B 4-pole Butterworth (1 Hz to 5 kHz)
    DP74L4L 4-pole Bessel (1 Hz to 5 kHz)


    D72H2B 2-pole Butterworth
    D74H4B 4-pole Butterworth



(@ 25°C and rated power input)

Analog Input
  • Impedance: 1 GΩ / 15pF
  • Input Range: ±10V pk. Iinear
  • Maximum Input: ± 60V
  • Common Mode Rejection:
    75 dB min. @ 60Hz

Analog Output

  • Impedance: 0.1 Ω typ., 1.0Ω max.
  • Linear Operating Range: ±10V pk.
  • Channel to Channel Crosstalk:
    <-80 dB @ 10 kHz
  • Maximum Current: ±2mA
  • Offset Voltage: ±10mV max.
  • Offset Temp. Coeff. 20 µV/°C
  • Short Circuit Protection: Short to Ground
  • Peak Distortion @ 1 kHz, 3.54 Vrms: 80 dBc max.
  • In-band Spectral Noise, Gain of x500:
    230nV / sqrt(Hz)

Filter Characteristics

  • See D72 or D74 Series specifications
  • Cut-off Frequency fc (-3dB):
    Fixed frequency from 1 Hz to 100 kHz


  • Nominal Gain 1X
  • Accuracy:
    ± 1.0%
    (optional) 10X, 100X, 1000X, Contact factory for other gain options

Power Supply

  • From VME Backplane:
    +12V and -12V, ±5%, 0.9A max. each, no load
  • Isolation:
    Analog ground may be isolated from VME and chassis ground by jumper


  • Operating 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 Two groups of 16
  • No. of Output Channels
    32 Single Ended - DC coupled
  • Mating Connectors
    • Input: Female high density 62-pin D-sub, Quantity 2
    • Output: Male high density 44-pin D-sub, Quantity 1
  • Weight 1.5 LB2., (681 grams)

Ordering Information

We hope the information given here will be helpful. The information is based on data and our best knowledge, and we consider the information to be true and accurate. Please read all statements, recommendations or suggestions herein in conjunction with our conditions of sale which apply to all goods supplied by us. We assume no responsibility for the use of these statements, recommendations or suggestions, nor do we intend them as a recommendation for any use which would infringe any patent or copyright.

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



Phone: (815) 434-7800

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