LT1167 Instrumentation Amplifier: Pinout, Applications, Datasheet [FAQ]

Product Overview

The LT ®1167 is a low power, precision instrumentation amplifier that requires only one external resistor to set gains of 1 to 10,000. The low voltage noise of 7.5nV/√Hz (at 1kHz) is not compromised by low power dissipation(0.9mA typical for ±2.3V to ±15V supplies).

 

The part’s high accuracy (10ppm maximum nonlinearity, 0.08% max gain error(G = 10)) is not degraded even for load resistors  as low as 2k. The LT1167 is laser trimmed for very low input offset voltage (40μV max), drift (0.3μV/°C), high CMRR(90dB, G = 1) and  PSRR (105dB, G = 1).

 

Low input bias currents of 350pA max are achieved with the use of superbeta processing. The output can handle capacitive loads up to 1000pF in any gain configuration while the inputs are ESD  protected up to 13kV (human body). The LT1167 with two external 5k resistors passes the IEC 1000-4-2 level 4 specification.

 

This blog will introduce LT1167 systematically from its features, pinout to its specifications, applications, also including LT1167 datasheet and so much more.

LT1167 Features

• Single Gain Set Resistor: G = 1 to 10,000
• Gain Error: G = 10, 0.08% Max
• Input Offset Voltage Drift: 0.3μV/°C Max
• Meets  IEC 1000-4-2 Level 4 ESD  Tests withTwo External 5k Resistors
• Gain Nonlinearity: G = 10, 10ppm Max
• Input Offset Voltage: G = 10, 60μV Max
• Input Bias Current: 350pA Max
• PSRR at G = 1: 105dB Min
• CMRR at G = 1: 90dB Min
• Supply Current: 1.3mA Max
• Wide Supply Range: ±3V to ±18V
• 1kHz Voltage Noise: 7.5nV/√Hz
• 1Hz to 10Hz Noise: 0.28μVP-P
• Available in 8-Pin   PDIP   and SO Packages

 

LT1167 Pinout

The following figure is the diagram of LT1167 pinout.

 

LT1167 Pinout

 

LT1167 Applications

• Bridge Amplifiers
• Strain Gauge Amplifi ers
• Thermocouple Amplifi ers
• Differential to Single-Ended Converters
• Medical Instrumentation

 

LT1167 Circuit Diagram

The followings are the circuit diagrams of LT1167.

 

Single Supply Barometer

 

Nerve Impulse Amplifier

 

Single Supply Bridge Amplifier

 

LT1167 Block Diagram

The following figure shows the block diagram of LT1167.

 

LT1167 Block Diagram

 

LT1167 Package

The following diagram shows the LT1167 package.

 

LT1167 Package

 

LT1167 Specification

Number of Amplifiers per Package	1
Minimum Total Supply Voltage (Vs+ to Vs-)	4.6V
Maximum Total Supply Voltage (Vs+ to Vs-)	40V
Slew Rate (V/µs)	1.2V/us
Short Circuit Current	27mA
Max Gain in V/V	10000V/V
Minimum Gain in V/V	1V/V
Bandwidth at min gain (typ)	1MHz
0.1 to 10 Hz Voltage Noise (typ)	280nV p-p
Bias Current Temperature Coefficient	400fA/°C
Min CMRR @ 60 Hz Min Gain	90dB
Min CMRR @ 60 Hz Max Gain	126dB
Current Noise Density	124fA/rtHz
Gain Control Interface	Resistor
Ibias (max)	350pA
Vos (max)	40µV
Input Headroom from V+ (max)	1.4V
Input Headroom from V- (max)	1.9V
Output Headroom from V+ (max)	1.2V
Output Headroom from V- (max)	1.1V
Output Voltage Noise (typ)	67nV/rtHz
Gain Temperature Coefficent - Lowest Gain (max)	1ppm/°C
Gain Temperature Coefficent - Highest Gain (max)	50ppm/°C
Gain Error - Highest Gain (max)	0.001
Gain Error - Lowest Gain (max)	0.0002
Input Offset Current (max)	320pA
Input Offset Current Temperature Drift (typ)	300fA/°C
Iq/Amp (max)	1.3mA
Input Voltage Noise (typ)	7.5nV/rtHz
0.1 to 10 Hz Current Noise (typ)	10pA p-p
Offset temperature drift (max)	300nV/°C

LT1167 Manufacturer

Analog Devices (NASDAQ: ADI) is a world leader in the design, manufacture, and marketing of a broad portfolio of high performance analog, mixed-signal, and digital signal processing (DSP) integrated circuits (ICs) used in virtually all types of electronic equipment.

 

LT1167 Datasheet

You can download LT1167 datasheet from the link given below:

LT1167 Datasheet

 

Using Warnings

Note: Please check their parameters and pin configuration before replacing them in your circuit.

 

LT1167 FAQ

What is an instrumentation amplifier?

An instrumentation amplifier (sometimes shorthanded as in-amp or InAmp) is a type of differential amplifier that has been outfitted with input buffer amplifiers, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment.

 

What is an instrumentation amplifier used for?

An instrumentation amplifier (IA) is used to provide a large amount of gain for very low-level signals, often in the presence of high noise levels. The major properties of IAs are high gain, large common-mode rejection ratio (CMRR), and very high input impedance.

 

What are features of instrumentation amplifier?

Instrumentation amplifiers are precision, integrated operational amplifiers that have differential input and single-ended or differential output. Some of their key features include very high common mode rejection ratio (CMRR), high open loop gain, low DC offset, low drift, low input impedance, and low noise.

 

What are the advantages of an instrumentation amplifier?

It has low noise. It has a very high open-loop gain. It has very high common-mode rejection ratio(CMRR). It has very high input impedances.

 

What is the difference between differential amplifier and instrumentation amplifier?

An instrumentation amplifier is a special kind of differential amplifier. In general, it is a differential amplifier, but the input impedances on the two inputs are very high (meaning very small input currents), and the same for each input. There is usually a way to change the gain with one resistor.