INA350 – Tiny and low-power (100 µA) selectable gain instrumentation amplifier

15 February, 2022

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INA350 is a selectable-gain instrumentation amplifier that offers four gain options across INA350ABS and INA350CDS variants available in small packages. INA350ABS has gain options of 10 or 20 and INA350CDS has gain options of 30 or 50. These gain options can be selected by toggling the gain select (GS) pin. INA350 is ideal for bridge-type sensing and for differential to single-ended conversion applications.

Built with precision matched integrated resistors, INA350 saves on BOM costs, pick-and-place machine handling costs, and board space by removing the need for precise or closely-matched external resistors. The device interface directly to low-speed, 10-bit to 14-bit, analog-to-digital converters (ADC) and is ideal for replacing the discrete implementation of instrumentation amplifiers built with commodity amplifiers and discrete resistors.

Designed with the three-amplifier architecture, INA350 is optimized for delivering performance. It achieves 85 dB of minimum CMRR and 0.6% of maximum gain error, along with 1.2 mV of maximum offset across all gain options, while consuming just 125 µA of maximum quiescent current. It has an integrated shutdown option to turn off the amplifier when idle for additional power savings in battery powered applications.

Features

Ideal for size, cost, and power conscious designs
Selectable gain options
- G = 10 or G = 20 (INA350ABS)
- G = 30 or G = 50 (INA350CDS)
Space saving ultra-small package options
- 10-pin X2QFN (RUG) – 3 mm²
- 8-pin WSON (DSG) – 4 mm²
- 8-pin SOT23-THN (DDF) – 4.64 mm²
Optimized performance for 10-bit to 14-bit systems
- CMRR: 95 dB (typ) across all gains
- Offset voltage: 0.2 mV (typ) across all gains
- Gain error (typ):
  - 0.05% for G = 10; 0.06% for G = 20
  - 0.075% for G = 30; 0.082% for G = 50
Bandwidth: 100 kHz for G = 10 (typ)
Drives 500 pF with less than 20% overshoot (typ)
Optimized quiescent current: 100 µA (typ)
Shutdown option for power conscious applications
Supply range: 1.8 V (±0.9 V) to 5.5 V (±2.75 V)
Specified temperature range: –40°C to 125°C

Block Diagram

more information: https://www.ti.com/product/INA350

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Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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