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Simplified signal conditioning for high-voltage ADCs

Designed to simplify the signal-conditioning task in data acquisition, data logging and other high-performance industrial and instrumentation equipment, Analog Devices' AD8275 level-translating ADC driver is ideal for driving higher-speed 16bit SAR converters and lower sample-rate 18bit converters.

The 15MHz part, which translates 10V signals to 0 to 4V input levels, means that just one component can now be used to attenuate, level-shift, and drive low-voltage ADCs in high-voltage applications. The amplifier can also be configured to drive differential input converters.

The AD8275 G = 0.2 difference amplifier includes internal, matched, laser-trimmed resistors that achieve 0.002 percent gain error, and 1 ppm/°C (maximum) gain drift. Claiming low distortion and a settling time of 450ns to 0.001%, ADI says that the amplifier suits applications where quick, accurate data capture is required.

This 3 x 5mm part has a +40V to “35V input voltage range and rail-to-rail outputs. Single-supply operation reduces the amplifier's power consumption and helps protect the ADC from overdrive conditions. The AD8275 can be used as an analog front end, or it can follow buffers to level translate high voltages to a voltage range accepted by the ADC.

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