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450MHz

offset

Figure 2.4: Input circuit for each of the four analog channels.

2.2.2 Analog Inputs

The analog inputs of the ADC are single ended LEMO00 coax connectors. The inputs have a

50Ω impedance and are DC coupled. The inputs are converted to a diﬀerential signal using an

operational ampliﬁer. The input voltage range is 1V

p-p

centered around a programmable oﬀset

voltage. See section 6.4.3 for details.

Analog Oﬀsets

+0.5V

analog_offset[i] = 0V

-0.5 V

+0.5 V

analog_offset[i] = 0.2V

-0.5 V

0.2V

Figure 2.5: Users can add analog oﬀset to the input before sampling

Users can set the approximate center of the input voltage range individually for each channel

by using the analog oﬀset parameter. The valid voltage range for the oﬀset is speciﬁed in section

cronologic GmbH & Co. KG 6 Ndigo250M-14 User Guide

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Cronologic Ndigo Crate Betriebsanweisung Seite 10