A 20 bit Arbitrary Waveform Generator for medium-speed / high resolution waveform generation

The module features differential outputs with a programmable common-mode voltage. For single ended applications the positive output as well as the negative output can be used. There are 8 filter paths available, 4 of them can be user configured.

The module combines an excellent dynamic performance with a very high DC accuracy.

The module has 8 output ranges starting at 80mVpp up to 10.24Vpp, which covers a wide range of Unit Under Test input voltages.

A filter-bank with 4 Low Pass filters (1.2kHz, 12kHz, 40kHz, and 200kHz) provide excellent signal conditioning to obtain the best possible signal integrity. In addition there are 4 software selectable signal paths available for user defined filters.

The Module uses a combination of multiple DACs, sub-ranging and error correction to achieve a full 20 bit performance level.

The result is an excellent SNR, THD, linearity and step response, making it very suitable for sine wave generation, ultra linear ramp generation and fast stepping signals. With 4M-word (12M-byte) of memory very complex signal shapes can be generated.
All these features ensure a very accurate result when performing analog measurements. The unit is very suitable for testing ADCs on linearity and dynamic performance.

Resolution 20 bit
Update rate DC - 2MHz
Pattern depth 4M words
Clock and Trigger inputs
Input impedance > 1 MOhm
Threshold level 3.3 V CMOS/TTL (5 V tolerant)
Output characteristics
Output impedance 50 Ohm or low impedance (<1 Ohm)
Ranges Single Ended (Vpp) 80 mV, 0.16 V, 0.32 V, 0.64 V, 1.28 V, 2.56 V, 5.12 V, 10.24 V
Ranges differential (Vpp) 0.16 V, 0.32 V, 0.64 V, 1.28 V, 2.56 V, 5.12 V, 10.24 V, 20.48 V
Output filters (4 pole Butterw.) Bypass, 1.2 kHz, 12 kHz, 40 kHz, 200 kHz, plus 4 user signal paths
Bandwidth, -3 dB (typical) 500 kHz (5.12 Vpp range)
0.1 dB flatness (typical) 150kHz (5.12 Vpp range)
Output configuration Differential, Single Ended, 50 Ohm
Output operating range +/- 10.24 V
Dynamic characteristics
SNR (1 kHz) 92 dB
SNR (10 kHz) 91 dB
SNR (100 kHz) 88 dB
SNR (1 kHz input, A-weighted) 104 dB (BW 20 Hz - 20 kHz)
THD (1 kHz) -108 dB
THD (1 kHz with 1.2 kHz filter) -115 dB
THD (10 kHz) -106 dB
THD (100 kHz) -83 dB
THD (100 kHz 2 Vpp) -90 dB (typical)
SFDR (1 kHz) 108 dB

(5 Vpp output signal, 1.67 MS/s, BW DC-800 kHz)

Common mode voltage source
Resolution 20 Bit (10 µV)
Voltage range -5.12 V to +5.12 V
DC-offset accuracy ±(20 µV + 8 ppm of value)
Non Linearity ±10 ppm of range
Accuracy (filter bypass)
Absolute accuracy ±(40 µV + 10 ppm of range)
Non Linearity ±8 ppm of range (4 ppm typical)
Temperature drift (typical) ±(1 ppm of range + 2 ppm of value)/°C

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