COSINE Instrumentation and Current-Sense Amplifiers: Bridge and Shunt Front Ends

Precision measurement lives or dies at the front end. A bridge sensor, a thermocouple or a current shunt all produce a tiny differential signal on top of a large common-mode voltage, and the part that recovers it is an instrumentation or current-sense amplifier. This guide covers the COSINE (科山芯创) instrumentation and current-sense amplifiers we stock.

1. Precision instrumentation amplifiers

Instrumentation amplifiers give high common-mode rejection and a clean, fixed gain for differential sensors.

2. Current-sense amplifiers

Current sensing needs a part that tolerates the shunt common-mode voltage and amplifies the small drop accurately.

Selection checklist

• Define the common-mode voltage range first — it eliminates most candidates.
• Set the gain from your shunt drop and the ADC full-scale.
• Check offset and drift against the signal you must resolve.
• Confirm the input range survives the maximum bus voltage.

See the wider amplifiers range. Send us your common-mode range, gain and package for a quote.

Frequently asked questions

What is an instrumentation amplifier used for?

An instrumentation amplifier amplifies a small differential signal sitting on a large common-mode voltage — exactly the situation at a bridge sensor, a current shunt or a remote transducer. Its high common-mode rejection and fixed gain make it the standard front end for precision measurement.

How does a current-sense amplifier work?

A current-sense amplifier measures the small voltage across a shunt resistor and presents a larger, ground-referenced output. It must tolerate the shunt's common-mode voltage, which can be near the supply rail, so its input range matters as much as its gain.

Why use a dedicated current-sense amplifier instead of an op-amp?

A dedicated part is built for the high common-mode range and the small differential signal at the shunt, with the gain set internally. An op-amp can do it, but you must design the common-mode handling and gain yourself, which is easy to get wrong near the rail.

Are these COSINE parts drop-in replacements?

They are designed against the pinout and function of the referenced devices. Confirm package, pinout and electrical limits on the datasheet for your application before volume commitment.

About us & trademarks: JTDZ Tech (Shenzhen Jingteng Electronics Technology Co., Ltd.) is an independent distributor of electronic components. We are not an authorised distributor or representative of the manufacturers named in this article. Manufacturer and part names are used for indicative purposes only, to help identify the components discussed; all trademarks remain the property of their respective owners. Always verify specifications against the official datasheet before design-in or purchase.