INA821中文资料德州仪器数据手册PDF规格书

1 Features

• Differential to single-ended conversion

• Eight pin-programmable decade (scope) gains

– G (V/V) = ½, 1, 2, 5, 10, 20, 50, and 100

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

• Faster signal processing:

– Wide bandwidth: 6.2MHz (G < 10), 2.4MHz (G

= 50, 100)

– Input stage noise: 8.5nV/√Hz at G > 10V/V

– Filter option to achieve better SNR

• Input overvoltage protection to ±40V beyond

supplies

• Input-stage supply range:

– Single supply: 9V to 36V

– Dual supply: ±4.5V 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 VQFN

2 Applications

• Factory automation and controls

• Analog input modules

• Data acquisition (DAQ)

• Test and measurement

• Parametric measurement units (PMU)

3 Description

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 currentfeedback

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.