
ANALOG BENCH ATE
APPLICOS WFD22 Module
A 22 bit Waveform Digitizer for medium-speed / high resolution waveform capturing and analyzing
The module combines a superior dynamic performance with a very high DC accuracy.
The module features fully differential inputs to reduce common-mode level disturbances. It can also be used in Single Ended mode where an internal DC-offset source sets the midscale level. In this mode the negative input can be used as a GND Sense input, so the DC performance won’t be compromised due to ground currents. The user can select between a 100 MΩ low bias current input for highest absolute accuracy, or a 1 MΩ ultra-low noise input for highest dynamic performance. There are 10 input ranges from 0.425 Vpp to 10.2 Vpp, which allows easy adaptation to a wide range of Device Under Test output voltages. A filter-bank with 3 Low Pass filters (40 kHz, 250 kHz and 500 kHz) provides excellent signal conditioning resulting in lower noise and proper anti-aliasing.
Our proprietary technology combines four 20 bit ADCs to create an advanced 22 bit converter. This results in excellent SNR and linearity with a resolution down to 0.1 µV. The large capture memory of 32M-word (96 MB) allows capturing long waveforms. This can be very useful when a high number of averages is required. All these features together result in the highest accuracy available when performing analog measurements. DAC linearity and dynamic performance measurements are a breeze with the WFD22 in the ATX7006 system. Also applications like: Power meter testing, MRI amplifier test, Quantum effect research, etc. will benefit from the outstanding analog performance of the WFD22.


| General | |
|---|---|
| Resolution | 22 bit |
| Sample rate | 0 - 1 MHz |
| Pattern depth | 32M words |
| Accuracy (DC-offset off, filter bypass) | |
|---|---|
| Absolute accuracy | ±(40 µV + 10 ppm of range) |
| Non Linearity error | ±8 ppm of range (3 ppm typical) |
| Temperature drift (typical) | ±(1 ppm of range + 2 ppm of reading)/ºC |
| Input characteristics | |
|---|---|
| Input impedance / mode | 100 MOhm low bias current mode / 1 MOhm low noise mode |
| Input configuration | Differential / Single Ended (-Input to Gnd, Gnd-sense or DC offset) |
| Input ranges (Vpp) | 0.425, 0.637, 0.850, 1.275, 1.70, 2.55, 3.40, 5.10, 6.80, 10.20 |
| Input filters | Bypass, 40 kHz (4-pole Butterw.), 250 kHz (5-pole Butterworth), 500 kHz (7-pole elliptic) |
| Bandwidth -3 dB (typical) | 1.1 MHz (5.10 Vpp range) |
| 0.1 dB flatness (typical) | 200 kHz (5.10 Vpp range) |
| Input Common mode range | +/- 10.2 V |
| Dynamic characteristics | |
|---|---|
| SNR (5 Vpp, 1 kHz input) | 99 dB (105 dB typical) |
| SNR (5 Vpp, 10 kHz input) | 97 dB |
| SNR (5 Vpp, 100 kHz input) | 93 dB |
| SNR (1 kHz input, A-weighted) | 110 dB (BW 20 Hz - 20 kHz) |
| THD (5 Vpp, 1 kHz input) | -115 dB (-122 dB typical) |
| THD (5 Vpp, 10 kHz input) | -110 dB |
| THD (5 Vpp, 100 kHz input) | -94 dB |
| SFDR (5 Vpp, 1 kHz input) | 112 dB |
| CMRR (typical) | 110 dB |
(conditions: 1 MOhm input mode, 1 MS/s, 500 kHz filter on)
| Accuracy DC-offset | |
|---|---|
| Resolution | 20 bit (10 µV) |
| Voltage range | -5.1 V to +5.1 V |
| DC-offset accuracy | ±(10 µV + 6 ppm of value) |
| Non Linearity | ±3 ppm of range |
| Clock & Trigger inputs | |
|---|---|
| Input impedance | > 1 MOhm |
| Threshold level | 3.3 V CMOS/TTL (5 V tolerant) |
| Accuracy DC-offset (100 ksps) | |
|---|---|
| Absolute accuracy, ranges 1.70 - 10.2 Vp | ±(25 µV + 10 ppm of range) |
| Absolute accuracy, ranges 0.425 - 1.275 Vp | ±(25 µV + 15 ppm of range) |
| Non Linearity error | ±3 ppm of range (1.5 ppm typical) |
| Input bias current (typical) | 1 pA in 100 MOhm mode / 50 nA in 1 MOhm mode |