DC to 20kHz spectrum, 1KHz carrier, 800kHz filter-on
The WFD20 is a 20 bit Waveform Digitizer for medium-speed / high resolution waveform capturing and analyzing. The module combines an excellent dynamic performance with a very high DC accuracy. The module features a fully differential input path to reduce common-mode level disturbances. If the internal DC-offset voltage source is used, the negative input can still be used as a GND Sense input, so the DC performance won’t be compromised due to ground currents. The module has 8 input ranges from 0.544 Vpp to 8.16 Vpp, which allows easy adaptation to a wide range of Unit Under Test output voltages.
A filter-bank with 3 Low Pass filters (40 kHz, 250 kHz and 800 kHz) provide excellent signal conditioning to obtain the best result in dynamic performance: low noise and anti-aliasing. The special combination of four 18 bit ADCs to a 20 bit converter gives an excellent SNR and linearity and a resolution down to 0.52 µV. With 4M-word (12M-byte) of memory a large number of samples can be captured. All these features ensure a very accurate result when performing analog measurements. The unit is very suitable for testing DAC linearity and dynamic performance.