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


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