Avago Technologies ACPL-224-500E - Manual (Page 38)

AV02-4387EN 35 Avago Technologies
Description
The 6N136 Low-Input Current Op-
tocoupler is used to detect stand-
ard telephone ring signals. At the
optocoupler output, a 0.1 µF base-
collector capacitor provides a large
enough Miller-capacitance so that
a low-frequency ring signal (20 to
60 Hz) causes the output to remain
low when ringing occurs.
Performance of Circuit
• Can detect 20 to 60 Hz, 30 to 80
V
RMS
telephone ring signals
Benefits
• Simple and inexpensive circuit for
ring signal detection
• Meets worldwide regulatory iso-
lation standards
References
6N139 Low-Input Current Optocou-
pler Technical Data
Alternative Avago Parts
1) HCPL-0701 Small Outline, Low-
Input Current Optocoupler
2) HCPL-3700/60 Threshold Sensing
Optocoupler
3) HCNW139 Low-Input Current Op-
tocoupler
Telephone Ring Detection
Telecommunications Applications
7
5
6
8
2
3
4
1 R(–)
6N139
+5 V
56 k Ω
V
OUT
100 k Ω
R(+)
100 k Ω
22 M Ω
1N4150
-48 V dc
10 k Ω
0.1 µF
1 k Ω
0.02 µF
2N3906