PGA855中文資料德州儀器數(shù)據(jù)手冊(cè)PDF規(guī)格書

1 Features

? Differential to single-ended conversion

? Eight pin-programmable binary gains

– G (V/V) = ?, ?, ?, 1, 2, 4, 8, and 16

? Low gain error drift: ±2ppm/°C (maximum)

? Faster signal processing:

– Wide bandwidth: 10MHz at all gains

– High slew rate: 35V/μs at G ≥ ? V/V

– Settling time:

700ns to 0.01%, 950ns to 0.0015%

– Input stage noise: 8.6nV/√Hz at G = 16V/V

– Filter option to achieve better SNR

? Input overvoltage protection to ±40V beyond

supplies

? Input-stage supply range:

– Single supply: 8V to 36V

– Dual supply: ±4V to ±18V

? Independent output power-supply pins

? Output-stage supply range:

– Single supply: 4.5V to 36V

– Dual supply: ±2.25V to ±18V

? Specified temperature range: –40°C to +125°C

? Small package: 3mm × 3mm QFN

2 Applications

? Factory automation and control

? Analog input module

? Data acquisition (DAQ)

? Test and measurement

? Parametric measurement unit (PMU)

3 Description

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.