Analogue / Linear / Mixed Signal ICs Rohm op amps operate full-swing on 1.7V

Analogue / Linear / Mixed Signal ICs Rohm op amps operate full-swing on 1.7V

2013/12/20

Rohm has developed a range of  op amps for use in motion sensor applications such as accelerometers (shock) and angular velocity detection.

The devices are used to amplify the small signals generated by sensors and the BD5291G and BD5291FVE op amps have input/output full-swing operation at only 1.7V.

The op amps derive their signal accuracy because the offset voltage generated at the differential input stage is reduced significantly, resulting in a high common-mode rejection ratio (70dB min).

As a result it is possible to amplify small signals, such as those from MEMS accelerometers and  sensors with greater accuracy.

This also makes them suitable for microphone amps, active filters, buffer amps and amplification circuits.

“Unlike conventional input/output full-swing opamps that operate from 1.8V, these products support 1.7V operation, providing sufficient margin against supply voltage fluctuations,” said the supplier.

Common-mode rejection ratio is 70dB (min), making it possible to provide high-accuracy signal amplification. (CMRR is calculated by dividing the common-mode signal variation with the output voltage variation, with 45dB and 70dB roughly equivalent to 178x and 3,162x, respectively.)

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