Precision Ultralow Noise, Set Gain, Zero-Drift Differential Amplifier

he ADE1139 is a zero-drift fully-differential programmable-gain amplifier, targeted to interface with a di/dt current sensor. It features a rail-to-rail input and differential output swing. With an output common-mode offset voltage of 8 mV, output common-mode offset voltage drift of 15 μV/°C for all gain conditions, and typical differential noise density of 7 nV/√Hz, the ADE1139 is well suited for applications in which error sources cannot be tolerated.

The ADE1139 has a wide operating supply range of 3.0 V to 5.5 V, high gain, and excellent common-mode rejection ratio (CMRR) and power-supply rejection ratio (PSRR) specifications, which makes it ideal for applications that require precision amplification of low-level signals. The ADE1139 is specified over the extended industrial temperature (−40°C to +125°C), and is available in a 12-lead LFCSP package.

APPLICATIONS

* Thermocouple/thermopile

* Load cell and bridge transducer

* Precision instrumentation

* Electronic scales

* Medical instrumentation

* Handheld test equipment

* Low offset: 2.5 μV maximum

* Low offset voltage drift: 0.015 μV/°C maximum

* Low noise

* 5.6 nV/√Hz at f = 1 kHz, AV = +100

* 97 nV p-p at f = 0.1 Hz to 10 Hz, AV = +100

* Open-loop voltage gain: 130 dB minimum

* CMRR: 80 dB minimum

* PSRR: 80 dB minimum