AD250 Creative Engineering Concepts 12-Bit 25 MSa/s Digitizer

The Creative Engineering Concepts AD250 is a single 6U VME board that implements the front end signal conditioning and variable gain amplifiers in addition to a high speed analog to digital converter operating at a sample rate of 25 MHz.

The AD250 features an analog RF preselector to reject out of band interference that would otherwise consume dynamic range.

Two variable gain amplifier stages provide up to 80 db of gain control, allowing the board toacquire low level signals or signals that have been processed by other signal conditioning systems.

An onboard antialiasing filter restricts the input bandwidth to approximately 11.5 MHz.

The analog to digital converter has resolution of twelve bits that are available as differential ECL or TTL signals on the front panel. The user may choose either option for data and clock at time of order. The VME bus backplane is used only for control.

The AD250 is intended to be used with a wideband digital filter, digital tuner, or other high speed digital signal processor as art of a multiple board DSP system. Custom versions of the AD250 are available with different sample rates and filter cutoff frequencies. For system applications where external bandlimiting is provided, the onboard antialiasing filter can be bypassed. The user may also choose between AC and DC input signal coupling or input disconnection.