5

Application information

5.1

Nanopower applications

The TSU112IY can operate from 1.5 V to 5.5 V. The parameters are fully specified at 1.8 V, 3.3 V, and 5 V supply

industrial temperature range from -40 to 125 °C.

5.1.1

Schematic optimization aiming for nanopower

To benefit from the full performance of the TSU112IY, the impedances must be maximized so that current

consumption is not lost where it is not required.

For example, an aluminum electrolytic capacitance can have significantly high leakage. This leakage may be

greater than the current consumption of the op-amp. For this reason, ceramic type capacitors are preferred.

For the same reason, big resistor values should be used in the feedback loop. However, there are two main

limitations to be considered when choosing a resistor.

1.

Noise generated: a 100 kΩ resistor generates 40 nV/√Hz, a bigger resistor value generates even more

noise.

2.

Leakage on the PCB: leakage can be generated by moisture. This can be improved by using a specific

coating process on the PCB.

TSU112IY

Application information

DS13616 - Rev 1

page 18/32