Low-noise wide-bandwidth precision programmable-gain amplifier

The PGA848 is a

wide-bandwidth, low-noise programmable gain instrumentation amplifier for

differential-to-single-ended conversion. The PGA848 is equipped

with eight decade (scope) gain settings, from an attenuating gain of 0.5V/V to a maximum of

100V/V. Gain is set using three digital gain selection pins.

The PGA848

architecture is optimized to drive inputs of high-resolution, precision analog-to-digital

converters (ADCs) with sampling rates up to 1MSPS without additional ADC drivers. The

output-stage power supplies are decoupled from the input stage to protect the ADC or

downstream devices against overdrive damage.

The super-beta input transistors offer an

impressively low input bias current, which in turn provides a very low input current noise

density of 0.3pA/√Hz. This capability makes the PGA848 a versatile choice for virtually any sensor type. The low-noise

current-feedback front-end architecture offers exceptional gain flatness even at high

frequencies, making the PGA848 an excellent high-impedance

sensor readout device. Integrated protection circuitry on the input pins handles

overvoltages of up to ±40V beyond the power-supply voltages.