PGA854 Low-Noise, Wide-Bandwidth, Decade Gain, Precision Programmable Gain

Instrumentation Amplifier

1 Features

• Eight pin-programmable decade (scope) gains

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

• Fully differential outputs

• Output common-mode control

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

• Faster signal processing:

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

(G = 50, 100)

– High slew rate: 45V/µs at all gains

– Settling time: 750ns to 0.01% (G < 20)

– Input stage noise: 8.8nV/√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 control

• Analog input module

• Data acquisition (DAQ)

• Test and measurement

• Parametric measurement unit (PMU)

3 Description

The PGA854 is a wide-bandwidth, high-voltage, low-

noise programmable gain instrumentation amplifier

with differential output. The PGA854 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 PGA854 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 PGA854 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 PGA854 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.

Package Information

PART NUMBER

PACKAGE(1)

PACKAGE SIZE(2)

PGA854

RGT (VQFN, 16)

3mm × 3mm

(1)

For more information, see Section 11.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

+

–

OUT+

IN

IN+

OUT

ADC

INP

INN

FDA_IN

FDA_IN+

PGA854

+

–

VIN+

VIN

VOCM

+

VOUT

Gain

Network

VDGND

OVP

OVP

VS

VS+

5V

VDD

VSS

R

R

Rf

Rf

VS+

VS

DGND

A<2:0>

VCOM

LVSS

LVDD

VIN

+

VOUT = G × VIN

VLVDD

VLVSS

A<2:0>

PGA854 Simplified Application

Frequency (Hz)

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

20

30

40

50

10

100

1k

10k

100k

1M

10M

G = 0.5

G = 1

G = 2

G = 5

G = 10

G = 20

G = 50

G = 100

Gain vs Frequency

PGA854

SBOSAN2A – AUGUST 2025 – REVISED DECEMBER 2025

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.