The ISL28274 is a combination of a micropower instrumentation amplifier (Amp A) with a low power precision amplifier (Amp B) in a single package. The ISL28474 consists of two micropower instrumentation amplifiers (Amp A) and two low power precision amplifiers (Amp B) in a single package. The amplifiers are optimized for operation at 2.4V to 5V single supplies. Inputs and outputs can operate rail-to-rail. As with all instrumentation amplifiers, a pair of inputs provide a high common-mode rejection and are completely independent from a pair of feedback terminals. The feedback terminals allow zero input to be translated to any output offset, including ground. A feedback divider controls the overall gain of the amplifier. The additional precision amplifier can be used to generate higher gain, with smaller feedback resistors or used to generate a reference voltage. The instrumentation amp (Amp A) is compensated for a gain of 100 or more and the precision amp (Amp B) is unity gain stable.
The ISL28274 combines a micropower instrumentation amplifier with a low‑power precision op‑amp in a single QSOP package, while the ISL28474 offers two of each. Both devices operate from a single 2.4 V to 5 V supply and feature rail‑to‑rail input and output ranges, low input bias current, and high CMRR.
Key features include 120 µA typical supply current for the ISL28274, input offset voltages of 500 µV (IN‑AMP) and 225 µV (OP‑AMP), 30 pA max input bias current, and RoHS‑compliant Pb‑free packaging. The datasheet provides pinouts, absolute maximum ratings, electrical specifications, and typical performance curves.
| Supply voltage range | 2.4 V to 5.0 V |
|---|---|
| Input offset voltage (OP‑AMP) | 225 µV max |
| Input bias current | ≤30 pA |
| CMRR | 100 dB |
| PSRR | 100 dB |
| Typical supply current (ISL28274) | 120 µA |
| Package (ISL28274) | QSOP‑16 |
| Package (ISL28474) | QSOP‑24 |
Both devices operate from a single supply of 2.4 V to 5.0 V.
The ISL28274 draws about 120 µA when all channels are enabled.
Yes, the parts are Pb‑free and meet RoHS requirements.
The ISL28274 is offered in a 16‑lead QSOP package, while the ISL28474 uses a 24‑lead QSOP package.