Low-Noise Analog Integrator for use with PCB-Based di/dt Sensors

The ADEMO141A/ADEMO141B is a low-drift, low-noise, fully-differential amplifier which can be operated as an analog integrator, for use with a PCB-based di/dt current sensor and analog-to-digital converter (ADC). It has a output common-mode voltage of 1.2V and supply voltage of 3.3V. The analog integrator amplifies signal and cancels the frequency dependance of the current sensor.

The ADEMO141A/ADEMO141B has high gain, low noise, and excellent common-mode rejection ratio (CMRR) and power-supply rejection ratio (PSRR) specifications, which makes it ideal for high accuracy energy measurement applications. The ADEMO141A/ ADEMO141B is specified over the extended industrial temperature (−40°C to +125°C), and is available in a 8-lead LFCSP.

For more details on the ADEMO141A/ADEMO141B, contact the local Analog Devices, Inc., sales office at www.analog.com/sales.

APPLICATIONS

* Single-phase energy meters

* Polyphase energy meters

* Split-phase energy meters

* Power quality monitoring

* Protective devices

* Smart breakers

* EV chargers

* Machine health

* Smart power distribution units

* Single-supply operation: 2.97V to 3.63V

* User configurable integrator gain, ADEMO141A gain at 50Hz, using different feedback capacitor

* 397.9, CFB = 10nF

* 265.3, CFB = 15nF

* 180.9, CFB= 22nF

* 102.0, CFB= 39nF

* ADEMO141B gain at 50Hz, using different feedback capacitor

* 49.7, CFB = 10nF

* 33.2, CFB = 15nF

* 22.6, CFB = 22nF