ADS808中文资料12 位 70MSPS ADC，具有单端/差动输入、内部/外部参考、灵活时钟、可选择全范围和断电功能数据手册TI规格书

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.