Design Goals
Output | Thresholds | Supply | |||||
---|---|---|---|---|---|---|---|
Vo = HIGH | Vo = LOW | VH | VL | VHYS | Vcc | Vpu | Vref |
Vi > VH | Vi < VL | 1.7 V | 1.3 V | 400 mV | 3 V | 3 V | 3 V |
Design Description
Comparators are used to differentiate between two different signal levels. With noise, signal variation, or slow-moving signals, undesirable transitions at the output can be observed with a constant threshold. Setting upper and lower hysteresis thresholds eliminates these undesirable output transitions. This circuit example will focus on the steps required to design the positive feedback resistor network necessary to obtain the desired hysteresis for a non-inverting comparator application.
Design Notes
Design Steps
Design Simulations
DC Transfer Simulation Results
Transient Simulation Results
Design References
See Analog Engineer's Circuit Cookbooks for TI's comprehensive circuit library.
See Circuit SPICE Simulation File SLVMCR2.
For more information on many comparator topics including hysteresis, propagation delay and input common mode range please see TI Precision Labs - Op amps.
Design Featured Comparator
TLV7031, TLV7041 | |
---|---|
Output Type | PP (7031), OD (7041) |
Vcc | 1.6 V to 6.5 V |
VinCM | Rail-to-rail |
Vos | ±100 µV |
VHYS | 7 mV |
Iq | 335 nA/Ch |
tpd | 3 µs |
#Channels | 1 and 2 |
TLV7041 Product Page |
Design Alternate Comparator
TLV1701 | TLV7011, TLV7011 | |
---|---|---|
Output Type | Open Collector | PP (7011), OD (7021) |
Vcc | 2.2 V to 36 V | 1.6 V to 5.5 V |
VinCM | Rail-to-rail | Rail-to-rail |
VHYS | N/A | 4.2 mV |
Vos | ±500 µV | ±500 µV |
Iq | 55 µA/Ch | 335 nA/Ch |
tpd | 560 ns | 3 µs |
#Channels | 1, 2, and 4 | 1 and 2 |
TLV1701 Product Page | TLV7011 Product Page |