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INA121P +BOM

The INA121P features a high input impedance and low output impedance for accurate signal amplification

Manufacturer:

Texas Instruments
Mfr.Part #:

INA121P
Datasheet:

INA121P Datasheet (PDF)
Amplifier Type:

Instrumentation
Number Of Circuits:

1
Slew Rate:

0.7V/µs
-3db Bandwidth:

600 kHz
EDA/CAD Models:

Request Free CAD Models for INA121P

INA121P General Description

The INA121 is a FET-input, low power instrumentation amplifier offering excellent accuracy. Its versatile three-op amp design and very small size make it ideal for a variety of general purpose applications. Low bias current (±4pA) allows use with high impedance sources.

Gain can be set from 1V to 10,000V/V with a single external resistor. Internal input protection can withstand up to ±40V without damage.

The INA121 is laser-trimmed for very low offset voltage (±200μV), low offset drift (±2μV/°C), and high common-mode rejection (106dB at G = 100). It operates on power supplies as low as ±2.25V (+4.5V), allowing use in battery operated and single 5V systems. Quiescent current is only 450μA.

Package options include 8-pin plastic DIP and SO-8 surface mount. All are specified for the -40°C to +85°C industrial temperature range.

Key Features

LOW BIAS CURRENT: ±4pA
LOW QUIESCENT CURRENT: ±450μA
LOW INPUT OFFSET VOLTAGE: ±200μV
LOW INPUT OFFSET DRIFT: ±2μV/°C
LOW INPUT NOISE: 20nV/sqrt(Hz) at f = 1kHz (G =100)
HIGH CMR: 106dB
WIDE SUPPLY RANGE: ±2.25V to ±18V
LOW NONLINEARITY ERROR: 0.001% max
INPUT PROTECTION TO ±40V
8-PIN DIP AND SO-8 SURFACE MOUNT

Application

Sensor Interfaces:
- Used in sensor interface circuits for amplifying small signals from sensors such as thermocouples, strain gauges, and pressure sensors.
Medical Instrumentation:
- Applied in medical devices and instrumentation for amplifying bioelectric signals, ECG (electrocardiogram) signals, and other medical sensor outputs.
Industrial Measurement Systems:
- Integrated into industrial measurement systems for precise amplification of signals from sensors in manufacturing and process control.
Bridge Amplification:
- Used in Wheatstone bridge amplification circuits for applications like load cells and other bridge-type sensors.
Data Acquisition Systems:
- Employed in data acquisition systems for accurate amplification of analog signals before digitization.

Specifications

Category	Integrated Circuits (ICs)LinearAmplifiersInstrumentation, OP Amps, Buffer Amps	Series	-
Amplifier Type	Instrumentation	Number of Circuits	1
Output Type	-	Slew Rate	0.7V/µs
-3db Bandwidth	600 kHz	Current - Input Bias	4 pA
Voltage - Input Offset	200 µV	Current - Supply	450µA
Current - Output / Channel	14 mA	Voltage - Supply Span (Min)	4.5 V
Voltage - Supply Span (Max)	36 V	Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole	Base Product Number	INA121