DESCRIPTION The AD9237 is a family of monolithic, single 3 V supply, 12-bit, 20 MSPS/40 MSPS/65 MSPS analog-to-digital converters hold amplifier (SHA) and voltage reference. The AD9237 uses a multistage differential pipelined architecture with output error correction logic to provide 12-bit accuracy at 20 MSPS/ 40 MSPS/65 MSPS data rates and guarantees no missing codes over the full operating temperature range. With significant power savings over previously available ADCs, the AD9237 is suitable for applications in imaging and medical ultrasound. Fabricated on an advanced CMOS process, the AD9237 is available in a 32-lead LFCSP and is specified over the industrial temperature range ( 40 C to +85 C). PRODUCT HIGHLIGHTS 1. Evaluation boards available for all speed grades. 2. Operating at 65 MSPS, the AD9237 consumes a low 190 mW at 65 MSPS, 135 mW at 40 MSPS, and 85 mW at 20 MSPS. 3. Power scaling reduces the operating power further when running at lower speeds. 4. features a separate di FEATURES Ultralow power 85 mW at 20 MSPS 135 mW at 40 MSPS 190 mW at 65 MSPS SNR = 66 dBc to Nyquist at 65 MSPS SFDR = 80 dBc to Nyquist at 65 MSPS DNL = 0.7 LSB Differential input with 500 MHz bandwidth Flexible analog input: 1 V p-p to 4 V p-p range Offset binary, twos complement, or gray code data formats Output enable pin 2-step power-down Full power-down and sleep mode Clock duty cycle stabilizer APPLICATIONS Ultrasound and medical imaging Battery-powered instruments Hand-held scope meters Low cost digital oscilloscopes Low power digital still cameras and copiers Low power communications FUNCTIONAL BLOCK DIAGRAM SHAVIN+VIN-DRVDDCLKPDWNMODECLOCKDUTY CYCLESTABILIZERMODESELECTDGNDOTRD11D0AVDDMDAC1CORRECTION LOGICOUTPUT BUFFERSREFSELECTAGND0.5VVREFSENSEAD923705455-001REFTREFBMODE2A/DA/D415123OE10-STAGE1 1/2-BITPIPELINE Figure 1. GENERAL DESCRIPTION The AD9237 is a family of monolithic, single 3 V supply, 12-bit, 20 MSPS/40 MSPS/65 MSPS analog-to-digital converters hold amplifier (SHA) Specifications subject to change without notic