MAX4238/MAX4239 are low-noise, low-drift, ultra- high precision amplifiers that offer near-zero DC offset and drift through the use of patented autocorrelating zeroing techniques. This method constantly measures and compensates the input offset, eliminating drift over time and temperature and the effect of 1/f noise. Both devices feature rail-to-rail outputs, operate from a single 2.7V to 5.5V supply, and consume only 600µA. An active- low shutdown mode decreases supply current to 0.1µA. The MAX4238 is unity-gain stable with a gain-band- width product of 1MHz, while the decompensated MAX4239 is stable with AV ≥ 10V/V and a GBWP of 6.5MHz. The MAX4238/MAX4239 are available in 8-pin narrow SO, 6-pin TDFN and SOT23 packages.
The MAX4238 and MAX4239 are ultra‑low offset, low‑drift, low‑noise precision amplifiers that use a patented auto‑zeroing technique to achieve near‑zero DC offset and drift. They operate from a single 2.7 V to 5.5 V supply, consume 600 µA typical current, and feature an active‑low shutdown mode that reduces supply current to 0.1 µA.
Available in 6‑pin SOT23, 8‑pin SO, and 6‑pin TDFN packages, these devices are suited for thermocouple, strain‑gauge, ADC‑buffer, and medical instrumentation applications. Ordering information and package outlines are provided on Maxim’s website.
| Input Offset Voltage (typical) | 0.1 µV |
|---|---|
| Shutdown Current (typical) | 0.1 µA |
| Gain‑Bandwidth Product (MAX4238) | 1 MHz |
| Gain‑Bandwidth Product (MAX4239) | 6.5 MHz |
| Operating Temperature Range | -40 °C to +125 °C |
The shutdown mode draws only 0.1 µA when the SHDN pin is pulled low.
They are available in 6‑pin SOT23, 8‑pin SO, and 6‑pin TDFN packages.
The typical input offset voltage is 0.1 µV.
The MAX4239 has a gain‑bandwidth product of 6.5 MHz.