描述 Description

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.

特性 Features

·DYNAMIC RANGE: ????SNR: 64dB at 10MHz fIN ????SFDR: 68dB at 10MHz fIN
·PREMIUM TRACK-AND-HOLD: ???Low Jitter: 0.25ps rms ???Differential or Single-Ended Inputs ???Selectable Full-Scale Input Range
·FLEXIBLE CLOCKING: ???Differential or Single-Ended ???Accepts Sine or Square Wave Clocking ???Down to 0.5Vp-p ???Variable Threshold Level
·APPLICATIONS ·BASESTATION WIDEBAND RADIOS: ???CDMA, GSM, TDMA, 3G, AMPS, and NMT
·TEST INSTRUMENTATION
·CCD IMAGING

PowerPAD is a registered trademark of Texas Instruments.