Electronics Weekly
Called the ZXCT21xQ family, there are six gain options:
- 50V/V ZXCT213Q
- 75V/V ZXCT215Q
- 100V/V ZXCT214Q
- 200V/V ZXCT210Q
- 500V/V ZXCT211Q
- 1kV/V ZXCT212Q
Inside is a ‘zero-drift’ topology. Each type has A, B and C variants that offer a choice of input offset and gain linearity. C-types are the most precise as all have 0.5% gain linearity, and 200, 500 and 1,000V/V parts exhibit ±35μV input maximum offset (±550nV typical). 10ppm/°C maximum gain error drift is specified in all parts.
Operation is across 2.7V to 26V supplies (100μA max quiescent) and -40 to +125°C, and shunt drops down to 10mV full-scale are supported.
This is a slow device, with bandwidth measured in kHz and a 0.4V/µs slew rate. Where high-bandwidth differential input signal are expected, an RRC input filter can be implemented with a series resistor (up to 10Ω to retain accuracy) in each input lead and a capacitor across the inputs. “Ideally, select the capacitor to exactly match the time constant of the shunt resistor and its inductance,” said Diodes.
Packaging is 2 x 2.1mm 6pad SOT363.
All parts are AEC-Q100 Grade 1 qualified for automotive use, manufactured in IATF 16949 certified facilities, and support PPAP documentation.
Automotive applications include current sensing in brush-less dc motor controllers, dc-dc converters, on-board chargers, battery management systems, automated driving unit power supplies and wireless phone chargers.
The ZXCT21xQ product page can be found here, and its data sheet here
