Bi-directional current monitors are based on zero drift architecture
Bi-directional current monitors based on a high-stability zero-drift architecture make up the ZXCT199 series from Diodes. According to the company, these devices are capable of accurately measuring very low sense voltages across a wide range of common mode voltages and are particularly suitable for laptop PCs, battery chargers, industrial servos, servers, power supply racks in server farms and robotic systems.
There are six devices in the series. Each ZXCT199 current monitor devices features a precision chopper stabilised op amp for high accuracy operation. The low offset voltage enables current sensing with maximum drops across shunts as low as 10mV full scale. This allows high currents to be measured via inexpensive, low value shunt resistor components, explained Diodes.
The ZXCT199 series are voltage output type devices, and are available in three fixed voltage gain options in 50V/V, 100V/V and 200V/V. The current monitors can measure voltages across shunts at common mode voltages from -0.1V to 26V, independent of the supply voltage.
The current sensors have an operational temperature range of -40 to +125 degrees C, exhibiting minimal gain error across this range. For the A and B versions (ZXCT199A and ZXCT199B), the maximum gain error over temperature is ± one per cent. The C version (ZXCT199C) is ±0.8 per cent. Offset voltage levels are a maximum of ±150 microV for the ZXCT199A, ±100 microV for the ZXCT199B, and just ±80 microV for the highest precision ZXCT199C version. All variants can be powered via a 2.7V to 26V supply. Maximum drawn supply current is just 100 microA.
The ZXCT199A, ZXCT199B and ZXCT199C are available now.
Diodes is a Standard and Poor’s SmallCap 600 and Russell 3000 Index company. It delivers semiconductor products to companies in the consumer electronics, computing, communications, industrial, and automotive markets. Its product portfolio consists of discrete, analogue, and mixed signal products and packaging technology. The company has operations at 32 sites, including engineering, testing, manufacturing, and customer service.
