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Precision differential amplifier drives 20-bit ADCs, uses 2 mA

Precision differential amplifier drives 20-bit ADCs, uses 2 mA

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By eeNews Europe



It can convert single-ended signals to differential outputs or be used in a fully differential manner, settling an 8 VP-P differential output step to 18-bit resolution in 780 nsec. Four external resistors set the amplifier’s gain. The LT5400 family of highly matched quad resistors can be used to achieve excellent linearity. The LTC6363 is stable whether configured for unity gain, higher gain, or attenuation; it operates on a 2.8V to 11V supply, its outputs swing rail-to-rail and a VOCM pin sets the output common mode voltage for optimal matching to the input range of precision 20-bit SAR ADCs such as the LTC2378-20.

The LTC6363 is specified over the -40°C to 85°C and -40°C to 125°C temperature ranges, and is available in MSOP-8 and 2 x 3 mm DFN packages. Prices start at $2.49 (1,000).

Linear Technology; www.linear.com/product/LTC6363.

Next page; feature list


Summary of Features: LTC6363

100 µV max offset voltage

50 nA max input offset current

Fast settling: 780 nsec to 18-bit, 8VP-P output

1.9 mA supply current

2.9 nV/√Hz input-referred noise

2.8V (±1.4V) to 11V (±5.5V) supply voltage range

Differential rail-to-rail outputs

Input common mode range includes ground

Low distortion: 115 dB SFDR at 2 kHz, 18 VP-P

500 MHz gain-bandwidth product

35 MHz -3 dB bandwidth

Low power shutdown: 20 µA (VS = 3V)

8-lead MSOP & 2 x 3mm 8-lead DFN packages

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