WFD16 – 16 bit / 180 MS/s Waveform Digitizer
The WFD16 is a 16 bit Waveform Digitizer for high-speed / high resolution waveform capturing and analyzing. The fully differential signal path ensures an exceptional high signal quality. Despite this emphasis on signal quality the WFD16 also has a good DC accuracy. The module features differential inputs with a 50 Ohm or 10 kOhm termination and a with a programmable common-mode voltage. For single ended applications the negative input can be connected to the internal DC-offset voltage source to cancel out a DC component of the input signal. The clock can come from the backplane or from the front panel. The module has 16 input ranges starting at 0.512 Vpp up to 7.68 Vpp, which covers a wide range of Unit Under Test output voltages.

A filter-bank with 3 Low Pass filters (15 MHz, 30 MHz, and 60 MHz) removes out-of-band noise and provides anti-aliasing. The Module uses a state of the art ADC which provides an excellent SNR, THD and linearity. The unit is an excellent choice for dynamic signal capturing and analysis as well as time domain analysis. With 8M-word (16M-byte) of memory long signal streams 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

WFD16 – 16 bit / 180 MS/s Waveform Digitizer

Key Features

  • 180 MHz max sample speed
  • 16 bit resolution
  • Fully differential inputs
  • 16 input ranges
  • Selectable filters to reduce out-of-band noise
  • -92 dB THD typical at 1 MHz
  • 71 dB SNR typical
  • Programmable DC-offset voltage
  • For ATX series hardware platform

Technical Specifications

General

Resolution 16 bit
Sample rate 1 MHz - 180 MHz
Pattern depth 8M words

Input characteristics

Input impedance 50 Ohm or 10 kOhm /25 pF
Input ranges (Vpp) 0.512 V, 0.64 V, 0.786 V, 0.96 V, 1.042 V, 1.28 V, 1.536 V, 1.92 V, 2.048 V, 2.56 V, 3.072 V, 3.84 V, 4.096 V, 5.12 V, 6.114 V, 7.68 V
Input filters (3 pole Butterw.) Bypass, 15 MHz, 30 MHz, 60 MHz
Bandwidth -3 dB (typical) 100 MHz (50 Ohm)
Input configuration Differential, Single Ended, 50 Ohm or 10 kOhm, DC or AC coupled
Input operating area 2 times the input range

Accuracy (filter bypass)

Absolute accuracy ±(800 µV + 0.1 % of range)
Non Linearity ±0.006 of range
Temperature drift (typical) ±(10 ppm of range + 20 ppm of value)/ºC

DC-offset source

Resolution 16 bit
Voltage range equal to the input range
DC-offset accuracy ±(500 µV + 0.01 % of value)
Non Linearity ±100 ppm of range

Dynamic characteristics

(2 Vpp diff. input signal, 160 MS/s, BW DC-80 MHz)

SNR (1 MHz) 70 dB
SNR (10 MHz) 68 dB
THD (1 MHz) -89 dB
THD (10 MHz) -85 dB
SFDR (1 MHz) 90 dB

Clock inputs

Input impedance 50 Ohm
Threshold level 0 V / 1 V

Trigger inputs

Input impedance 1 kOhm
Threshold level 0 V / 1 V