12

REV1.2

www.3peakic.com.cn

TP2011/TP2012/TP2014

Ultra-Low Power 200nA, 1.6V, RRIO, Push-Pull Output Comparators

Inverting Comparator with Hysteresis

The inverting comparator with hysteresis requires a three-resistor network that is referenced to the comparator supply

Figure 5. Inverting Configuration with Hysteresis

DD

V

2

3

||

1

2

tr

V

R

R

R

R





DD

V

1

3

||

2

3

||

2

tf

V

R

R

R

R

R





DD

V

3

2

||

1

2

||

1

tf

V

tr

V

hyst

V

R

R

R

R

R









Low Input Bias Current

The TP201x family is a CMOS comparator family and features very low input bias current in pA range. The low input

bias current allows the comparators to be used in applications with high resistance sources. Care must be taken to

minimize PCB Surface Leakage. See below section on “PCB Surface Leakage” for more details.

PCB Surface Leakage

In applications where low input bias current is critical, Printed Circuit Board (PCB) surface leakage effects need to be

considered. Surface leakage is caused by humidity, dust or other contamination on the board. Under low humidity

which is greater than the TP201x’s input bias current at +27°C (±6pA, typical). It is recommended to use multi-layer

PCB layout and route the comparator’s -IN and +IN signal under the PCB surface.

The effective way to reduce surface leakage is to use a guard ring around sensitive pins (or traces). The guard ring is

biased at the same voltage as the sensitive pin. An example of this type of layout is shown in Figure 6 for Inverting

configuration application.

1. For Non-Inverting Configuration:

comparator.