SC5 Signal Conversion Fast Analog Output
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described in the Electrical ground section. The output stage consists of a 20-bit, 1 MS/s DAC, followed by a 1st
order low-pass filter with a corner frequency of 1.1 MHz (-3 dB) and a buffer, which is shown in the picture below.
Figure 16: Schematic of the fast analog output stage.
Specifications (fast output)
Connectors BNC
Coupling DC, referenced to AGND
Output voltage range ±10 V into 500 Ω or larger
(Note: Voltage errors due to load resistance: 10% on 500 Ω,
1% on 5 kΩ, 0.1% on 50 kΩ)
Output impedance 50 Ω, short circuit safe
Analog bandwidth DC – 1.1 MHz (-3 dB)
Analog filter type
1
order
DA converter 20-bit, monotonic, 1 MS/s
Effective resolution 20-bit.
DNL ± 0.5 LSB typical @ 20 bit
INL ± 2 LSB typical @ 20 bit
Output noise density < 20 nV/sqrt(Hz) @ 100 Hz, ±10 V output range
Rms noise 0.1 – 10 Hz < 600 nV rms, ±10 V output range
Peak-peak noise 0.1 – 10 Hz < 2.5 µVp-p, ±10 V output range
RMS noise 10 Hz – 300 kHz < 12 µV rms, ±10 V output range
Peak-peak noise 10 Hz – 300 kHz < 105 µVp-p, ±10 V output range
Maximum output current ± 70 mA
Maximum slew rate 20 V/µs into 2 kΩ
Offset < 800 µV
EMC protection According to EN61326-1, Table-1
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