TSC2010H datasheet(26/50 Pages) STMICROELECTRONICS

номер детали	TSC2010H

подробное описание детали	High temperature, high voltage, precision, bidirectional current sense amplifiers

PDF	50 Pages

Scroll/Zoom	100%

производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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26 / 50 page

Most of the current is still due to the pin In+ as we can see on the iibp curve of Figure 7. The current is about -

300 µA, some of it being Vicm / (R4 + R1) and some other supplies the circuit, roughly 250 µA. A small part of

the current, coming from the common mode rail, is also due to the input In– in order to power the TSC2011H, in a

range of -100 µV.

•

Output common mode range

The TSC2011H output common mode voltage level can be set thanks to voltages applied on the VREF1 and

VREF2 pins. These two pins allow the device to be set either in bidirectional or in unidirectional operation. The

voltage applied to those pins must not exceed the Vcc range. The different configurations are detailed in the

section Unidirectional/Bidirectional operation.

As depicted by Figure 4, VREF1 and VREF2 pins can be driven by an external voltage source capable of

sourcing/sinking a current following the equation below:

Iref= Vicm−Vref

5kΩ+275kΩ+25kΩ

(1)

Figure 57. Vref powered by an external voltage source

When the output common mode voltage is supplied by an external power supply, in order to improve the output

voltage measurement, it is recommended to measure the Vout differentially with respect to Vref voltage. It provides

a better CMRR measurement, better noise immunity and also a more accurate Vout voltage. A decoupling

capacitance of 1 nF minimum can be also added to better filter the power supply, and can also be used as a tank

capacitance in case an ADC is connected to this reference voltage.

TSC2010H, TSC2011H, TSC2012H

Theory of operation

DS13791 - Rev 1

page 26/50

TSC2010H датащи(PDF) 26 Page - STMicroelectronics