Datasheet AD9237 (Analog Devices)

12-Bit, 20 MSPS/40 MSPS/65 MSPS 3 V Low Power A/D Converter Data Sheet AD9237 FEATURES FUNCTIONAL BLOCK DIAGRAM Ultralow power AVDD DRVDD 85 mW at 20 MSPS 135 mW at 40 MSPS VIN+ 10-STAGE SHA MDAC1 1 1/2-BIT A/D 190 mW at 65 MSPS VIN– PIPELINE SNR = 66 dBc to Nyquist at 65 MSPS 4 15 3 REFT A/D SFDR = 80 dBc to Nyquist at 65 MSPS REFB DNL = ±0.7 LSB CORRECTION LOGIC Differential input with 500 MHz bandwidth 12 OE Flexible analog input: 1 V p-p to 4 V p-p range MODE2 OUTPUT BUFFERS OTR Offset binary, twos complement, or gray code data formats D11 AD9237 Output enable pin VREF D0 2-step power-down CLOCK DUTY CYCLE Full power-down and sleep mode MODE SENSE STABILIZER SELECT Clock duty cycle stabilizer REF 0.5V SELECT APPLICATIONS AGND CLK PDWN MODE DGND
05455-001
Ultrasound and medical imaging
Figure 1.
Battery-powered instruments Hand-held scope meters Low cost digital oscilloscopes Low power digital still cameras and copiers Low power communications GENERAL DESCRIPTION PRODUCT HIGHLIGHTS
The AD9237 is a family of monolithic, single 3 V supply, 12-bit, 1. Operating at 65 MSPS, the AD9237 consumes a low 190 mW 20 MSPS/40 MSPS/65 MSPS analog-to-digital converters at 65 MSPS, 135 mW at 40 MSPS, and 85 mW at 20 MSPS. (ADC). This family features a high performance sample-and- 2. Power scaling reduces the operating power further when hold amplifier (SHA) and voltage reference. The AD9237 uses a running at lower speeds. multistage differential pipelined architecture with output error 3. The AD9237 operates from a single 3 V power supply and correction logic to provide 12-bit accuracy at 20 MSPS/ features a separate digital output driver supply to 40 MSPS/65 MSPS data rates and guarantees no missing codes accommodate 2.5 V and 3.3 V logic families. over the ful operating temperature range. 4. The patented SHA input maintains excellent performance for input frequencies beyond Nyquist and can be configured With significant power savings over previously available ADCs, for single-ended or differential operation. the AD9237 is suitable for applications in imaging and medical 5. The AD9237 is optimized for selectable and flexible input ultrasound. ranges from 1 V p-p to 4 V p-p. 6. An output enable pin allows for multiplexing of the outputs. Fabricated on an advanced CMOS process, the AD9237 is 7. Two-step power-down supports a standby mode in addition available in a 32-lead LFCSP and is specified over the industrial to a power-down mode. temperature range (−40°C to +85°C). 8. The OTR output bit indicates when the signal is beyond the selected input range. 9. The clock duty cycle stabilizer (DCS) maintains converter performance over a wide range of clock pulse widths.
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Document Outline Features Applications Functional Block Diagram General Description Product Highlights Table of Contents Revision History Specifications DC Specifications Digital Specifications AC Specifications Switching Specifications Timing Diagram Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Terminology Equivalent Circuits Typical Performance Characteristics Applying the AD9237 Theory of Operation Analog Input and Reference Overview Differential Input Configurations Single-Ended Input Configuration Voltage Reference Internal Reference Connection External Reference Operation Clock Input Considerations Power Dissipation, Power Scaling, and Standby Mode Digital Outputs Operational Mode Selection Out of Range (OTR) Digital Output Enable Function (OE) Timing Outline Dimensions Ordering Guide