ADS809

The ADS809 is a high-dynamic range 12-bit, 80MHz pipelined Analog-to-Digital (A/D) converter. It includes a high-bandwidth linear track/hold that gives excellent spurious performance up to and beyond the Nyquist rate. This high-bandwidth track/hold also 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 ADS809 has a 2Vp-p differential input range (1Vp-p x 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 ADS809 also provides an over-range flag that indicates when the input signal has exceeded the converter's fullscale 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 ADS809 is available in a small TQFP-48 package.