Datasheet
SN55107A, SN75107A, SN75107B, SN75108A
DUAL LINE RECEIVERS
SLLS069D – JANUARY 1977 – REVISED APRIL 1998
17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
window detector
The window detector circuit in Figure 21 has a large number of applications in test equipment and in determining
upper limits, lower limits, or both at the same time, such as detecting whether a voltage or signal has exceeded
its window limits. Illumination of the upper-limit (lower-limit) indicator shows that the input voltage is above
(below) the selected upper (lower) limit. A mode selector is provided for selecting the desired test. For window
detecting, the upper-and-lower-limits test position is used.
Mode
Selector
1
2
3
4
500 Ω
500 Ω
5 V –5 V
1 kΩ 1 kΩ
Set
Upper
Limit
Set
Lower
Limit
5 kΩ
1 kΩ
Upper-Limit
Indicator
Lower-Limit
Indicator
MODE SELECTOR LEGEND
POSITION CONDITION
1Off
2 Test for Upper Limit
3 Test for Lower Limit
4 Test for Upper and Lower Limits
5 V
Input From
Test Point
4.7 kΩ
4.7 kΩ
4.7 kΩ
Figure 21. Window Detector Using SN75108A