1 Features
• Eight pin-programmable binary gains
– G (V/V) = ⅛, ¼, ½, 1, 2, 4, 8, and 16
• Low gain error drift: 1 ppm/°C (max) at G = 1 V/V
• Fully differential outputs
– Independent output power-supply pins to allow
for ADC input overdrive protection
– Output common-mode control
• Faster signal processing:
– Wide bandwidth: 10 MHz at all gains
– High slew rate: 35 V/μs
– Settling time:
500 ns to 0.01%, 950 ns to 0.0015%
– Input stage noise: 7.8 nV/√Hz at G = 16 V/V
– Filter option to achieve better SNR
• Input overvoltage protection to ±40 V beyond
supplies
• Input-stage supply range:
– Single supply: 8 V to 36 V
– Dual supply: ±4 V to ±18 V
• Output-stage supply range:
– Single supply: 4.5 V to 36 V
– Dual supply: ±2.25 V to ±18 V
• Specified temperature range: –40°C to +125°C
• Small package: 3-mm × 3-mm VQFN

2 Applications
• Factory automation and control
• Analog input module
• Data acquisition (DAQ)
• Test and measurement
• Semiconductor test

3 Description
The PGA855 is a high-bandwidth programmable
gain instrumentation amplifier with fully differential
outputs. The PGA855 is equipped with eight binary
gain settings, from an attenuating gain of 0.125 V/V
to a maximum of 16 V/V, using three digital gain
selection pins. The output common-mode voltage can
be independently set using the VOCM pin.
The PGA855 architecture is optimized to drive
inputs of high-resolution, precision analog-to-digital
converters (ADCs) with sampling rates up to 1 MSPS
without the need for an additional ADC driver.
The output-stage power supplies (LVSS/LVDD) are
decoupled from the input stage and can be connected
to power supplies of the ADC to protect the ADC or
downstream device 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 0.3 pA/√Hz,
making the PGA855 a versatile choice for virtually
any sensor type. The low-noise current-feedback
front-end architecture offers excellent gain flatness,
even at high frequencies, making the PGA855 an
excellent high-impedance sensor readout device.
Integrated protection circuitry on the input pins
handles overvoltages up to ±40 V beyond the powersupply
voltages.