INA155 CMOS Instrumentation Amplifier

Specifications

Product Overview

The INA155 is a Texas Instruments CMOS instrumentation amplifier for Signal_Chain circuits requiring low input current and defined gain behavior from a single low-voltage supply. Electrical performance is specified over +2.7 to +5.5 V, with functional operation from +2.5 to +6 V. Gain is selectable as 10 V/V with RG pins open or 50 V/V with RG pins connected, and an external RG supports gains between 10 and 50 using G = 10 + 400 kΩ / (10 kΩ + RG).

Input characteristics include 10^13 Ω || 3 pF differential and common-mode input impedance, 1 pA typical input bias current, and 1 pA typical input offset current at +25 °C. Noise is specified as 4.5 µVp-p from 0.1 Hz to 10 Hz, with voltage noise density of 260 nV/√Hz at 10 Hz, 99 nV/√Hz at 100 Hz, and 40 nV/√Hz at 1 kHz.

The device is offered in SO-8 and MSOP-8 packages with 150 °C/W thermal resistance. It supports applications such as low-voltage sensor signal conditioning, differential measurement, common-mode rejection stages, and gain-of-10 or gain-of-50 analog front ends within the stated supply and temperature limits.

Key Features

• Specified +2.7 to +5.5 V electrical performance range
• Functional operation from +2.5 to +6 V
• Pin-strapped gain options of 10 V/V or 50 V/V
• External RG sets gains between 10 and 50
• 0.2 mV typical RTI offset at +25°C
• 1 pA typical input bias and offset currents
• 100 dB typical CMRR at G=10 and +25°C
• 550 kHz bandwidth at G=10, 110 kHz at G=50
• 6.5 V/µs typical slew rate with 100 pF load
• SO-8 and MSOP-8 packages, 150 °C/W thermal resistance

Typical Applications

• Low-voltage sensor signal conditioning
• Differential signal measurement
• Gain-of-10 analog front ends
• Gain-of-50 analog front ends
• Common-mode rejection input stages
• Low input-bias current interfaces
• Single-supply instrumentation channels

Procurement Notes

When requesting a quote for INA155, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.

If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.

For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.