ADS805

ADS805 ADS805E SBAS073B – JANUARY 1997 – REVISED NOVEMBER 2002 12-Bit, 20MHz Sampling ANALOG-TO-DIGITAL CONVERTER FEATURES q HIGH SFDR: 74dB at 9.8MHz fIN q HIGH SNR: 68dB q LOW POWER: 300mW q LOW DLE: 0.25LSB q FLEXIBLE INPUT RANGE q OVER-RANGE INDICATOR DESCRIPTION The ADS805 is a 20MHz, high dynamic range, 12-bit, pipelined Analog-to-Digital Converter ADC. This converter includes a high-bandwidth track-and-hold that gives excellent spurious performance up to and beyond the Nyquist rate. This highbandwidth, linear track-and-hold minimizes harmonics and has low jitter, leading to excellent Signal-to-Noise Ratio (SNR) performance. The ADS805 is also pin-compatible with the 10MHz ADS804 and the 5MHz ADS803. The ADS805 provides an internal reference or an external reference can be used. The ADS805 can be programmed for a 2Vp-p input range which is the easiest to drive with a single op amp and provides the best spurious performance. Alter- APPLICATIONS q STUDIO CAMERAS q IF AND BASEBAND DIGITIZATION q COPIERS q TEST INSTRUMENTATION natively, the 5Vp-p input range can be used for the lowest input-referred noise of 0.09LSBs rms giving superior imaging performance. There is also the capability to set the input range between 2Vp-p and 5Vp-p, either single-ended or differential. The ADS805 also provides an over-range flag that indicates when the input signal has exceeded the converter’s full-scale range. This flag can also be used to reduce the gain of the front end signal conditi...