Pentek, Inc. (Upper Saddle River, NJ) has introduced the Model 7153 digital down converter (DDC), a four-channel, high-speed digitizer PMC module designed for processing baseband RF or IF signals from a communications receiver. The PMC module employs the ADS5485 A/D Converter from Texas Instruments. Four of these 200 MHz, 16-bit monolithic A/Ds in the front end of the Model 7153 deliver extremely high speed and resolution. The A/Ds exhibit a signal-to-noise ratio of 75 dBFS, and a spurious-free dynamic range of 87 dBc at a 70 MHz input frequency.
The Model 7153 DDC offers two modes of operation. The two-channel DDC mode sacrifices two DDC channels to boost the maximum decimation to 65,536 and extend the lower bandwidth limit down to 3 kHz. The four-channel DDC mode provides an independently programmable decimation range from two to 256 on each DDC, covering signal bandwidths from about 700 kHz to 90 MHz. Switching between modes is invoked through firmware. In either mode, the user can independently select any one of the four A/Ds as the source for each DDC channel. With four A/Ds and four wideband DDCs, the Model 7153 is ideal for high-bandwidth radar and communication systems such as wideband CDMA, UMTS, SRW, LTE, and 4G wireless.
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