Imaging and portable instrumentation and communications applications benefit from AD9237's 40 percent lower power consumption and pin-to-pin compatibility with existing ADI ADCs
Analog Devices has extended its portfolio of high-performance analog-to-digital converters (ADCs) with a 12-bit monolithic, 20/40/65 MSPS (mega samples per second) ADC that consumes 40 percent less power than comparable devices. Available in a 5 mm x 5 mm package, the AD9237 combines small size and low power to reduce board space in portable instrumentation, ultrasound, high-end imaging, digital still camera, scanner and low-power communications applications. The AD9237 is pin-to-pin compatible with existing members of ADI's high-performance family of ADCs, resulting in minimized board rework for system upgrades.
The AD9237 ADC is an ultra-low power extension of the company's existing AD9235 family. The device consumes a low 190 mW of power at 65 MSPS, 135 mW at 40 MSPS and 90 mW at 20 MSPS, allowing for a higher channel count and simplified signal path to portable 12-bit systems. Further power savings is available with a scaling feature, which lowers the power as the speed of the converter is reduced. The AD9237 operates from a single 3 V power supply and features a separate digital output driver supply to accommodate 2.5 V and 3 V logic families.
Pin-Compatibility and Differential Sample-and-Hold Amplifier
The AD9237 is pin-to-pin compatible with ADI's 10-bit AD9215, 12-bit AD9235 and 14-bit AD9245 20/40/65 MSPS ADCs, and also with the 12-bit AD9236 and 14-bit AD9245 80 MSPS ADCs. This enables designers to easily change resolutions and speeds, or upgrade performance in next-generation systems. In addition, a patented SHA (sample-and-hold amplifier) input allows for a variety of user-selectable input ranges and offsets including single-ended applications. The AD9237 is suitable for multiplexed systems that switch full-scale voltage levels in successive channels and for sampling single-channel inputs at frequencies well above the Nyquist rate. The AD9237 is also recommended for use with several of ADI's leading amplifier products, including the AD8351.
Availability and Pricing
The AD9237 20/40/65 MSPS ADCs are available now and priced between $7.75 and $12.40 per unit in 1,000-piece quantities. The devices are offered over the wider industrial temperature range (-40oC to +85oC) and are packaged in a space-saving 5 mm x 5 mm 32-pin LFCSP (lead frame chip scale package).
