Datasheet AD9236 (Analog Devices)

12-Bit, 80 MSPS, 3 V A/D Converter Data Sheet AD9236 FEATURES FUNCTIONAL BLOCK DIAGRAM Single 3 V supply operation (2.7 V to 3.6 V) AVDD DRVDD SNR = 70.4 dBc to Nyquist AD9236 SFDR = 87.8 dBc to Nyquist VIN+ Low power: 366 mW 8-STAGE SHA MDAC1 A/D 1 1/2-BIT PIPELINE VIN– Differential input with 500 MHz bandwidth 4 16 3 On-chip reference and sample-and-hold REFT A/D DNL = ±0.4 LSB REFB Flexible analog input: 1 V p-p to 2 V p-p range CORRECTION LOGIC OTR Offset binary or twos complement data format 12 Clock duty cycle stabilizer OUTPUT BUFFERS D11 (MSB) VREF APPLICATIONS D0 (LSB) High end medical imaging equipment SENSE 0.5V CLOCK MODE DUTY CYCLE IF sampling in communications receivers SELECT REF STABILIZER SELECT WCDMA, CDMA-One, CDMA-2000 Battery-powered instruments AGND CLK PDWN MODE DGND Hand-held scopemeters
03066-0-001
Low cost digital oscilloscopes
Figure 1.
DTV subsystems
presented in straight binary or twos complement formats. An
GENERAL DESCRIPTION
out-of-range (OTR) signal indicates an overflow condition that can be used with the most significant bit to determine low or The AD9236 is a monolithic, single 3 V supply, 12-bit, 80 MSPS high overflow. Fabricated on an advanced CMOS process, the analog-to-digital converter featuring a high performance sample- AD9236 is available in a 28-lead TSSOP and a 32-lead LFCSP and-hold amplifier (SHA) and voltage reference. The AD9236 and is specified over the industrial temperature range uses a multistage differential pipelined architecture with output (−40°C to +85°C). error correction logic to provide 12-bit accuracy at 80 MSPS
PRODUCT HIGHLIGHTS
and guarantee no missing codes over the full operating temperature range. 1. The AD9236 operates from a single 3 V power supply and features a separate digital output driver supply to The wide bandwidth, truly differential SHA al ows a variety of accommodate 2.5 V and 3.3 V logic families. user-selectable input ranges and common modes, including single-ended applications. It is suitable for multiplexed systems 2. Operating at 80 MSPS, the AD9236 consumes a low 366 mW. that switch ful -scale voltage levels in successive channels and 3. The patented SHA input maintains excellent performance for for sampling single-channel inputs at frequencies well beyond input frequencies up to 100 MHz, and can be configured for the Nyquist rate. Combined with power and cost savings over single-ended or differential operation. previously available analog-to-digital converters, the AD9236 is 4. The AD9236 is pin compatible with the AD9215, AD9235, suitable for applications in communications, imaging, and and AD9245. This allows a simplified migration from 10 bits medical ultrasound. to 14 bits and 20 MSPS to 80 MSPS. A single-ended clock input is used to control all internal 5. The DCS maintains overal ADC performance over a wide conversion cycles. A duty cycle stabilizer (DCS) compensates range of clock pulse widths. for wide variations in the clock duty cycle while maintaining 6. The OTR output bit indicates when the signal is beyond the excellent overall ADC performance. The digital output data is selected input range.
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Document Outline Features Applications General Description Functional Block Diagram Product Highlights Revision History DC Specifications AC Specifications Digital Specifications Switching Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Terminology Pin Configurations and Function Descriptions Equivalent Circuits Typical Performance Characteristics Theory of Operation Analog Input and Reference Overview Differential Input Configurations Single-Ended Input Configuration Clock Input Considerations Jitter Considerations Power Dissipation and Standby Mode Digital Outputs Timing Voltage Reference Internal Reference Connection External Reference Operation Operational Mode Selection Evaluation Board TSSOP Evaluation Board LFCSP Evaluation Board Outline Dimensions Ordering Guide