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INA111

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High Speed FET-Input Instrumentation Amplifier

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Data sheet

INA111

ACTIVE
Data sheet Order now

Product details

Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 12 Input offset (+/-) (Max) (uV) 500 Gain (Min) (V/V) 1 Gain (Max) (V/V) 1000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 10 Features Low bias current CMRR (Min) (dB) 106 Input offset drift (+/-) (Max) (uV/C) 5 Input bias current (+/-) (Max) (nA) 0.02 Iq (Typ) (mA) 3.3 Bandwidth at min gain (Typ) (MHz) 2 Gain error (+/-) (Max) (%) 0.5 Operating temperature range (C) -40 to 85 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 2.3 Output swing headroom (to positive supply) (Typ) (V) -2.3 Input common mode headroom (to negative supply) (Typ) (V) 3 Input common mode headroom (to positive supply) (Typ) (V) -3 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 1 Gain non-linearity (+/-) (Max) (%) 0.005
Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 12 Input offset (+/-) (Max) (uV) 500 Gain (Min) (V/V) 1 Gain (Max) (V/V) 1000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 10 Features Low bias current CMRR (Min) (dB) 106 Input offset drift (+/-) (Max) (uV/C) 5 Input bias current (+/-) (Max) (nA) 0.02 Iq (Typ) (mA) 3.3 Bandwidth at min gain (Typ) (MHz) 2 Gain error (+/-) (Max) (%) 0.5 Operating temperature range (C) -40 to 85 Type Resistor Output swing headroom (to negative supply) (Typ) (V) 2.3 Output swing headroom (to positive supply) (Typ) (V) -2.3 Input common mode headroom (to negative supply) (Typ) (V) 3 Input common mode headroom (to positive supply) (Typ) (V) -3 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 1 Gain non-linearity (+/-) (Max) (%) 0.005
PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (DW) 16 77 mm² 7.52 x 10.28
  • FET INPUT: IB = 20pA max
  • HIGH SPEED: TS = 4us (G = 100, 0.01%)
  • LOW OFFSET VOLTAGE: 500uV max
  • LOW OFFSET VOLTAGE DRIFT: 5uV/°C max
  • HIGH COMMON-MODE REJECTION: 106dB min
  • 8-PIN PLASTIC DIP, SOL-16 SOIC
  • APPLICATIONS
    • MEDICAL INSTRUMENTATION
    • DATA ACQUISITION
  • FET INPUT: IB = 20pA max
  • HIGH SPEED: TS = 4us (G = 100, 0.01%)
  • LOW OFFSET VOLTAGE: 500uV max
  • LOW OFFSET VOLTAGE DRIFT: 5uV/°C max
  • HIGH COMMON-MODE REJECTION: 106dB min
  • 8-PIN PLASTIC DIP, SOL-16 SOIC
  • APPLICATIONS
    • MEDICAL INSTRUMENTATION
    • DATA ACQUISITION

The INA111 is a high speed, FET-input instrumentation amplifier offering excellent performance.

The INA111 uses a current-feedback topology providing extended bandwidth (2MHz at G = 10) and fast settling time (4us to 0.01% at G = 100). A single external resistor sets any gain from 1 to over 1000.

Offset voltage and drift are laser trimmed for excellent DC accuracy. The INA111's FET inputs reduce input bias current to under 20pA, simplifying input filtering and limiting circuitry.

The INA111 is available in 8-pin plastic DIP, and SOL-16 surface-mount packages, specified for the -40°C to +85°C temperature range.

The INA111 is a high speed, FET-input instrumentation amplifier offering excellent performance.

The INA111 uses a current-feedback topology providing extended bandwidth (2MHz at G = 10) and fast settling time (4us to 0.01% at G = 100). A single external resistor sets any gain from 1 to over 1000.

Offset voltage and drift are laser trimmed for excellent DC accuracy. The INA111's FET inputs reduce input bias current to under 20pA, simplifying input filtering and limiting circuitry.

The INA111 is available in 8-pin plastic DIP, and SOL-16 surface-mount packages, specified for the -40°C to +85°C temperature range.
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Technical documentation

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Type Title Date
* Data sheet High Speed FET-Input Instrumentation Amplifier datasheet 27 Sep 2000
Application note Importance of Input Bias Current Return Paths in Instrumentation Amplifier Apps PDF | HTML 27 Jul 2021
Technical article What is an instrumentation amplifier? 09 Aug 2019
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
Technical article How to layout a PCB for an instrumentation amplifier 14 Oct 2016
Technical article Dealing with rejection: Instrumentation amplifier PSRR and CMRR (Part I) 25 Nov 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

INA111 PSpice Model (Rev. B)

SBOM012B.ZIP (23 KB) - PSpice Model
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Simulation model

INA111 TINA-TI Reference Design (Rev. B)

SBOC137B.TSC (99 KB) - TINA-TI Reference Design
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Simulation model

INA111 TINA-TI Spice Model (Rev. A)

SBOM206A.ZIP (5 KB) - TINA-TI Spice Model
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Calculation tool

ANALOG-ENGINEER-CALC — Analog engineer's calculator

The Analog Engineer’s Calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting op-amp gain with feedback (...)
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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 (...)
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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
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PDIP (P) 8 View options
SOIC (DW) 16 View options

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