ADS803

ADS803E ADS803 SBAS074B – JANUARY 1997 – REVISED SEPTEMBER 2002 12-Bit, 5MHz Sampling ANALOG-TO-DIGITAL CONVERTER FEATURES q HIGH SFDR: 82dB at NYQUIST q HIGH SNR: 69dB q LOW POWER: 115mW q LOW DLE: 0.25LSB q FLEXIBLE INPUT RANGE q OVER-RANGE INDICATOR DESCRIPTION The ADS803 is a high-speed, high dynamic range, 12-bit pipelined Analog-to-Digital (A/D) converter. This converter includes a high-bandwidth track-and-hold that gives excellent spurious performance up to and beyond the Nyquist rate. This high-bandwidth, linear track-and-hold minimizes harmonics and has low jitter, leading to excellent SNR performance. The ADS803 is also pin-compatible with the 10MHz ADS804 and the 20MHz ADS805. The ADS803 provides an internal reference and can be programmed for a 2Vp-p input range for the best spurious performance and ease of driving. Alternatively, the 5Vp-p input range can be used for the lowest input referred noise of +VS APPLICATIONS q IF AND BASEBAND DIGITIZATION q CCD IMAGING SCANNERS q TEST INSTRUMENTATION 0.09LSBs rms giving superior imaging performance. There is also a capability to set the input range in between the 2Vp-p and 5Vp-p input ranges or to use an external reference. The ADS803 also provides an over-range indicator flag to indicate an input range that exceeds the full-scale input range of the converter. This flag can be used to reduce the gain of the frontend gain-ranging circuitry. The ADS803 employs digital error-correction techniques to provide excellent ...