12-Bit, 70 MSPS ADC SE/Diff, Int/Ext Ref., Flexible Clocking, Selectable Fullscale Range & Powerdown
The ADS808 is a high-dynamic range, 12-bit, 70MHz, pipelined Analog-to-digital Converter (ADC). It includes a high-bandwidth linear track-and-hold that has a low jitter of only 0.25ps rms, leading to excellent SNR performance. The Clock input CAN accept a low-level differential sine wave or square wave signal down to 0.5Vp-p, further improving the SNR performance. It also accepts a single-ended Clock signal and has flexible threshold levels.
The ADS808 has a 2Vp-p differential input range (1Vp-p ? 2 inputs) for optimum signal-to-noise ratio. The differential operation gives the lowest even-order harmonic components. A lower input voltage of 1.5Vp-p or 1Vp-p CAN also be selected using the internal references, further optimizing SFDR. Alternatively, a single-ended input range CAN be used by tying the IN input to the common-mode voltage, if desired.
The ADS808 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 Conditioning circuitry. It also employs digital error-correction techniques to provide excellent differential linearity for demanding imaging applications. The ADS808 is available in a small TQFP-48 PowerPAD? thermally enhanced package.
By Texas Instruments
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