Overview
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The two input channels on the RF employ Analog Devices AD9226 A/D
converters with 12-bit resolution at up to 65 MHz. The input signal
processing chain consists of 50 Ohm input termination, a high speed low
distortion input amp, an optional programmable gain amp giving a signal
amplification range of -14 dB to +34 dB, followed by a 7th order low-pass
filter to the A/D. The twos complement data from the A/D converters clock
into 1 KWord FIFOs, which are configured to interrupt the host card at
programmable levels. Clocking is provided to the two A/Ds using either the
on-board dual channel DDS or an external clock source. |