VXI 16-Bit DAC Module

The V266 is a single-width, C-size, register-based, VXIbus module with 16, 32, or 64 analog output voltage channels at 16-bit resolution. Several output options are available.

The V266-ZA12 provides ±10V full-scale outputs, the V266-ZB12 provides 4-20mA current loop outputs and the V266-ZC12 provides ±16V full scale. These options provide 32 output channels. Additionally, the V266-ZA22 and -ZA32 provide ±10V full-scale outputs with a 64-channel density or 16-channel density respectively.

VXI 16-Bit DAC Module: V266

V266 Data Sheet

Supporting Software

Supporting Chassis

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Data values for each channel are written to a 16-bit wide, dual-port memory. This memory is sequentially scanned, and the values are applied to a single 16-bit digital-to-analog converter. The DAC output is then multiplexed to separate high-precision sample-and-hold circuits (one for each channel), and the outputs of these circuits are fed through active, 2-pole, low-pass Bessel filters before being brought to the front panel connector. Bessel filters are provided because of their optimum step response. The nominal cutoff frequency of each filter is set at 500 Hz. Since the voltage outputs of all circuits are accurate to within 1 mV of each other, only one gain and one offset potentiometer are needed to adjust the DAC.

Data can be written to or read from the V266 in either offset binary or two's complement format as determined by the state of a bit in the control register. During power-on, the module initiates a sequence to zero the memory contents. The output signals are available at a pair of high density connectors on the module's front panel. Paired output signals are provided to eliminate ground offset effects.

The V266 supports both static and dynamic configuration. It may be accessed using A24/A16, D16 data transfers.

VXI Module Features

  • 16, 32, or 64 Independent DAC Outputs
  • 16-Bit Resolution
  • ±10V, ±16V, or 4-20 mA Output
  • Low Drift
  • Single Gain and Offset Adjustments
  • 2-Pole Bessel Output Filter on Each Channel
    (Voltage Output Option)
  • Power-On Reset to Zero Volts (or 4 mA)

VXI Module Ordering Information

V266 Products and Part Numbers
32 Channels, 16-bit DAC, ±10V Output V266-ZA12
64 Channels, 16-bit DAC, ±10V Output V266-ZA22
16 Channels, 16-bit DAC, ±10V Output V266-ZA32
32 Channels, 16-bit DAC, 4-20mA Output V266-ZB12
32 Channels, 16-bit DAC, ±16V Output V266-ZC12
32 Channels, 16-bit DAC with 9-Position
Front Plate Power Connector