Low-noise wide-bandwidth precision programmable-gain amplifier

The PGA849 is a

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

differential-to-single-ended conversion. The PGA849 is

equipped with eight binary gain settings, from an attenuating gain of 0.125V/V to a

maximum of 16V/V, using three digital gain selection pins.

The PGA849

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

analog-to-digital converters (ADCs) with sampling rates up to 1MSPS without the need

for an additional ADC driver. 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, making the PGA849 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 PGA849 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.