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WFD20: 20 bit Waveform Digitizer
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WFD20
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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 0.544Vpp to 8.16Vpp, which allows easy adaptation to a wide range of Unit Under Test output voltages.
DC to 20kHz spectrum, 1KHz carrier, 800kHz filter-on
A filter-bank with 3 Low Pass filters (40kHz, 250kHz and 800kHz) 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 0.52μV. 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.
Block diagram
Specifications
conditions: after 1 hour warm-up, TA=25°C, filter bypass unless otherwise mentioned
General
| Resolution | 20 bit |
| Sample rate | 1.5kHz - 2MHz in warp mode, 0 - 1.5MHz in normal mode |
| Pattern depth | 4M words |
Input characteristics
| Input impedance | 100MΩ |
| Input ranges | 0.544Vpp, 0.816Vpp, 1.36Vpp, 2.04Vpp, 2.72Vpp, 4.08Vpp, 5.44Vpp, 8.16Vpp |
| Input filters | Bypass, 40kHz (4-pole Butterw.), 250kHz (5-pole Butterworth), 800kHz (7-pole elliptic) |
| Bandwidth -3dB (typical) | 2MHz (8.16Vpp range) |
| 0.1dB flatness (typical) | 400kHz (8.16Vpp range) |
| Input configuration | Differential / Single Ended (-Input to Gnd, Gnd-sense or DC offset) |
| Input Common mode range | +/- 10V |
Accuracy (DC-offset off, filter bypass)
| Absolute accuracy | ±(40μV + 10ppm of range) |
| Non Linearity error | ±8ppm of range (3ppm typical) |
| Temperature drift (typical) | ±(1ppm of range + 2ppm of reading)/°C |
DC-offset source
| Resolution | 19-bit (20μV) |
| Voltage range | -5V to +5V |
| DC-offset accuracy | ±(50μV + 12ppm of value) |
| Non Linearity | ±10ppm of range |
Dynamic characteristics
(conditions: 1.67Msps, 800kHz filter on)
| SNR (5Vpp, 1kHz input) | 93dB |
| SNR (5Vpp, 10kHz input) | 92dB |
| SNR (5Vpp, 100kHz input) | 91dB |
| SNR (1kHz input, A-weighted) | 105dB (BW 20Hz - 20kHz) |
| THD (2Vpp, 1kHz input) | -110dB |
| THD (2Vpp, 10kHz input) | -106dB |
| THD (2Vpp, 100kHz input) | -92dB |
| SFDR (2Vpp, 1kHz input) | 108 dB |
Clock & Trigger inputs
| Input impedance | > 1MΩ |
| Threshold level | 3.3V CMOS/TTL (5V tolerant) |