Description

The AD9240 is a 10 MSPS, single supply, 14-bit analog-to-digital converter (ADC). It combines a low cost, high speedCMOS process and a novel architecture to achieve the resolutionand speed of existing hybrid implementations at a fraction of thepower consumption and cost. It is a complete, monolithic ADCwith an on-chip, high performance, low noise sample-and-holdamplifier and programmable voltage reference. An external referencecan also be chosen to suit the dc accuracy and temperaturedrift requirements of the application. The device uses a multistage differential pipelined architecture with digital output error correction logic to guarantee no missing codes over the full operating temperature range.The input of the AD9240 is highly flexible, allowing for easyinterfacing to imaging, communications, medical and data-acquisition systems. A truly differential input structure allowsfor both single-ended and differential input interfaces of varyinginput spans. The sample-and-hold amplifier (SHA) is equallysuited for multiplexed systems that switch full-scale voltagelevels in successive channels as well as sampling single-channelinputs at frequencies up to and beyond the Nyquist rate. TheAD9240 also performs well in communication systems employing Direct-IF Down Conversion, since the SHA in the differential input mode can achieve excellent dynamic performance well beyond its specified Nyquist frequency of 5 MHz.A single clock input is used to control all internal conversioncycles. The digital output data is presented in straight binaryoutput format. An out-of-range (OTR) signal indicates anoverflow condition which can be used with the most significantbit to determine low or high overflow.PRODUCT HIGHLIGHTSThe AD9240 offers a complete single-chip sampling 14-bit, analog-to-digital conversion function in a 44-lead Metric Quad Flatpack. Low Power and Single Supply The AD9240 consumes only 280 mW on a single +5 V power supply. Excellent DC Performance Over Temperature The AD9240 provides no missing codes, and excellent temperature drift performance over the full operating temperature range. Excellent AC Performance and Low Noise The AD9240 provides nearly 13 ENOB performance and has an input referred noise of 0.36 LSB rms. Flexible Analog Input Range The versatile onboard sample-and-hold (SHA) can be configured for either single ended or differential inputs of varying input spans. Flexible Digital Outputs The digital outputs can be configured to interface with +3 V and +5 V CMOS logic families. Excellent Undersampling Performance The full power bandwidth and dynamic range of the AD9240 make it well suited for Direct-IF Down Conversion extending to 45 MHz.