4-Channel PC/104 Digital Drop Receiver Mezzanine

N/Asi/104 is a complete, high-performance digital drop receiver on a single PC/104 card. The board interfaces to ADSP-2106x SHARC processors on the company's PC/104 form factor host boards and features an Analog Devices AD6644 14-bit, 65MHz analog-to-digital converter (ADC) coupled with a Graychip GC4014 4-channel digital down converter (DDC) and a high stability local oscillator.

The receiver features a 100dB multi-tone SFDR, and a 74dB SNR. The converter is designed to target multi-channel, multi-mode receivers, and can be coupled with the Graychip GC4014 Digital Down Converter.

The receiver also features the DAC-8562, a 12-bit, 1 MSPS D/A converter from Analog Devices. It provides an automatic gain control (AGC) feedback loop that can be used to control receiver front-end electronics. An optional on-board OCXO of 59.535 MHz is available to replace the standard crystal oscillator. The OCXO is specified with frequency trimming to within +/- 0.1 ppm, frequency stability of +/- 2.5 ppm over –40 to +85 °C, +/- 0.3 ppm for a +/- 5% variation in power supply, and +/-1 ppm per year aging. Using either crystal as the source of the clock, the board generates an output word clock of 44.1 KHz with a TTL level, 50-Ohm drive.

<%=company%>, 33 North Main St., Concord, NH 03301, Tel: 603.226.0404, Fax: 603.226.6667