AD9237 12-Bit, 20/40/65 MSPS 3 V Low Power A/D Converter

A single-ended clock input is used to control all internal conversion cycles. The digital output data is presented in straight binary, twos complement, or gray code formats. An out-of-range (OTR) signal indicates an overflow condition, which can be used with the most significant bit to determine low or high overflow. Fabricated on an advanced CMOS process, the AD9237 is available in a 32-pin chip scale package and is specified over the industrial temperature range (-40°C to +85°C). Product Highlights Operating at 65 MSPS, the AD9237 consumes a low 190 mW and only consumes 135 mW at 40 MSPS and 90 mW at 20 MSPS. The AD9237 operates from a single 3V power supply, and features a separate digital output driver supply to accommodate 2.5V and 3.3V logic families. The patented SHA input maintains excellent performance for input frequencies beyond Nyquist, and can be configured for single-ended or differential operation. The AD9237 is pin compatible to the AD9235, a 12-bit, 20/40/65 MSPS A/D converter. This allows a simplified path for low power 12-bit systems. The AD9237 is optimized for selectable and flexible input ranges from 4 Vp-p to 1 Vp-p. Output Enable pin to allow for multiplexing of the outputs. Two-step power down supports a standby mode in addition to a power down mode. The OTR output bit indicates when the signal is beyond the selected input range. Applications Ultrasound and Medical Imaging Battery Powered Instruments Hand-Held Scopemeters Low Cost Digital Oscilloscopes Low Power Digital Still Cameras and Copiers Low power communications

The AD9237 is a monolithic, single 3 V supply, 12-bit, 20/40/65 MSPS Analog to Digital Converter with a high performance sample-and-hold amplifier and voltage reference. The AD9237 uses a multistage differential pipelined architecture with output error correction logic to provide 12-bit accuracy at 20/40/65 MSPS data rates and guarantee no missing codes over the full operating temperature range.

The wide bandwidth, truly differential SHA allows for a variety of user-selectable input ranges and offsets including single-ended applications. It is suitable for multiplexed systems that switch full-scale voltage levels in successive channels and for sampling single-channel inputs at frequencies well beyond the Nyquist rate. With significant power savings over previously available analog to digital converters, the AD9237 is suitable for applications imaging and medical ultrasound.

Fabricated on an advanced CMOS process, the AD9237 is available in a 32-pin chip scale package and is specified over the industrial temperature range (-40°C to +85°C).

Product Highlights

Operating at 65 MSPS, the AD9237 consumes a low 190 mW and only consumes 135 mW at 40 MSPS and 90 mW at 20 MSPS.
The AD9237 operates from a single 3V power supply, and features a separate digital output driver supply to accommodate 2.5V and 3.3V logic families.
The patented SHA input maintains excellent performance for input frequencies beyond Nyquist, and can be configured for single-ended or differential operation.
The AD9237 is pin compatible to the AD9235, a 12-bit, 20/40/65 MSPS A/D converter. This allows a simplified path for low power 12-bit systems.
The AD9237 is optimized for selectable and flexible input ranges from 4 Vp-p to 1 Vp-p.
Output Enable pin to allow for multiplexing of the outputs.
Two-step power down supports a standby mode in addition to a power down mode.
The OTR output bit indicates when the signal is beyond the selected input range.

Applications

Ultrasound and Medical Imaging
Battery Powered Instruments
Hand-Held Scopemeters
Low Cost Digital Oscilloscopes
Low Power Digital Still Cameras and Copiers
Low power communications

Features and Benefits

Ultra Low Power
85mW@20MSPS
135mW @ 40MSPS
190mW @ 65MSPS
SNR = 66 dBc to Nyquist at 65MSPS
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

Analog to Digital Converters

AD9237 IBIS Models

AD9237BCPZ (Valid for All Speed Grades) .IBS

Data Sheets

Document	note
AD9237: 12-Bit, 20 MSPS/40 MSPS/65 MSPS 3 V Low Power A/D Converter Data Sheet (Rev. C)	PDF 563.52 K

Application Notes

Document	note
AN-905: Visual Analog Converter Evaluation Tool Version 1.0 User Manual (Rev. 0)	PDF 2124 kB
AN-835: Understanding High Speed ADC Testing and Evaluation (Rev. B)	PDF 985 kB
AN-501: Aperture Uncertainty and ADC System Performance (Rev. A)	PDF 227 kB
AN-282: Fundamentals of Sampled Data Systems	PDF 2131 kB
AN-756: Sampled Systems and the Effects of Clock Phase Noise and Jitter (Rev. 0)	PDF 291.7 K
AN-827: A Resonant Approach to Interfacing Amplifiers to Switched-Capacitor ADCs (Rev. 0)	PDF 203 kB
AN-935: Designing an ADC Transformer-Coupled Front End (Rev. 0)	PDF 363 kB
AN-742: Frequency Domain Response of Switched-Capacitor ADCs (Rev. B)	PDF 401 kB
AN-345: Grounding for Low-and-High-Frequency Circuits	PDF 455 kB
AN-1142: Techniques for High Speed ADC PCB Layout (Rev. 0)	PDF 392 kB
AN-737: How ADIsimADC Models an ADC (Rev. B)	PDF 373 kB
AN-803: Pin Compatible High Speed ADCs Simplify Design Tasks (Rev. 0)	PDF 356 kB
AN-715: A First Approach to IBIS Models: What They Are and How They Are Generated (Rev. 0)	PDF 370.2 K
AN-741: Little Known Characteristics of Phase Noise (Rev. 0)	PDF 1679 kB