Adc sub-system, Input level, Output codes – Sundance SMT356 User Manual

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SMT356356 User Manual

ADC Sub-System

This consists of 8 Analog Devices AD9240 converters. These provide an overall
system performance with an ENOB of 12 (minimum) for each of the eight channels.

All ADCs simultaneously sample using the same clock.

Input Level

The input to the ADC module is DC coupled with a pk-pk level of 2v. This is centred
about 0v.

Vmin=-1v

Vmax=+1v.

Output Codes

The converted samples are presented on the SDB connector as 16 bit offset binary.

Code 0x0000 is equivalent to –Vmax

Code 0x8000 is equivalent to 0V

Code 0xFFFC is equivalent to +Vmax

The two least significant bits of the output word are undefined and should be masked
by the user.