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The AD9221, AD9223, and AD9220 are a generaTIon of highperformance, single supply 12-bit analog-to-digital converters.Each device exhibits true 12-bit linearity and temperature driftperformance1 as well as 11.5-bit or better ac performance.2 TheAD9221/AD9223/AD9220 share the same interface opTIons,package, and pinout. Thus, the product family provides an upwardor downward component selecTIon path based on performance,sample rate and power. The devices differ with respect to theirspecified sampling rate, and power consumpTIon, which is reflectedin their dynamic performance over frequency.The AD9221/AD9223/AD9220 combine a low cost, high speedCMOS process and a novel architecture to achieve the resolutionand speed of existing hybrid and monolithic implementations ata fraction of the power consumption and cost. Each device is acomplete, monolithic ADC with an on-chip, high performance,low noise sample-and-hold amplifier and programmable voltagereference. An external reference can also be chosen to suit thedc accuracy and temperature drift requirements of the application.The devices use a multistage differential pipelined architecturewith digital output error correction logic to provide 12-bit accuracyat the specified data rates and to guarantee no missingcodes over the full operating temperature range.The input of the AD9221/AD9223/AD9220 is highly flexible,allowing for easy interfacing to imaging, communications, medical,and data-acquisition systems. A truly differential inputstructure allows for both single-ended and differential inputinterfaces of varying input spans. The sample-and-hold
