Calculation tool
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PGA855
Low-noise, wide-bandwidth, fully-differential-output programmable-gain instrumentation amplifier
Data sheet
PGA855
- 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
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 power-supply voltages.
Technical documentation
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View all 5 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | PGA855 Low-Noise, Wide-Bandwidth, Fully Differential Output Programmable-Gain Instrumentation Amplifier datasheet (Rev. B) | PDF | HTML | 27 Sep 2023 |
| Product overview | PGA855 and PGA849 Product Overview (Rev. A) | PDF | HTML | 11 Jul 2024 | |
| Application note | Achieve High SNR with the PGA855, Fully Differential Programmable-Gain Amplifier | PDF | HTML | 21 Mar 2024 | |
| EVM User's guide | PGA855 Evaluation Module User's Guide (Rev. A) | PDF | HTML | 25 Sep 2023 | |
| Product overview | PLC Analog Input Front-End Architectures | PDF | HTML | 31 Jul 2022 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
PGA855EVM — PGA855 evaluation module for fully-differential-output programmable-gain instrumentation amplifier
The PGA855 evaluation module (EVM) is a development platform for evaluating the PGA855, which is a high-precision programmable-gain amplifier with differential outputs. PGA855 is optimized to drive inputs of high-performance analog-to-digital converters (ADCs) with fully differential inputs.
Simulation tool
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Simulation tool
TINA-TI — SPICE-based analog simulation program
TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
Reference designs
TIDA-010945 — Precision signal chain for digital multimeters reference design
This reference design explains the theory, design and testing of a high-performance signal chain for DC measurements. The main target application is digital multimeters (DMMs), however the design can also be applicable to other applications, such as data acquisition (DAQ) and condition monitoring. (...)
Design guide: PDF
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RGT) | 16 | Ultra Librarian |
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