Catalog
12-Bit, 70-MSPS Analog-to-Digital Converter (ADC)
Key Features
• DYNAMIC RANGE:SNR: 64dB at 10MHz fINSFDR: 68dB at 10MHz fINPREMIUM TRACK-AND-HOLD:Low Jitter: 0.25ps rmsDifferential or Single-Ended InputsSelectable Full-Scale Input RangeFLEXIBLE CLOCKING:Differential or Single-EndedAccepts Sine or Square Wave ClockingDown to 0.5Vp-pVariable Threshold LevelAPPLICATIONSBASESTATION WIDEBAND RADIOS:CDMA, GSM, TDMA, 3G, AMPS, and NMTTEST INSTRUMENTATIONCCD IMAGINGPowerPAD is a registered trademark of Texas Instruments.DYNAMIC RANGE:SNR: 64dB at 10MHz fINSFDR: 68dB at 10MHz fINPREMIUM TRACK-AND-HOLD:Low Jitter: 0.25ps rmsDifferential or Single-Ended InputsSelectable Full-Scale Input RangeFLEXIBLE CLOCKING:Differential or Single-EndedAccepts Sine or Square Wave ClockingDown to 0.5Vp-pVariable Threshold LevelAPPLICATIONSBASESTATION WIDEBAND RADIOS:CDMA, GSM, TDMA, 3G, AMPS, and NMTTEST INSTRUMENTATIONCCD IMAGINGPowerPAD is a registered trademark of Texas Instruments.
Description
AI
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.
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.
