LOW INPUT CURRENT
HIGH GAIN SPLIT
DARLINGTON OPTOCOUPLERS
SINGLE-CHANNEL
6N138
DUAL-CHANNEL
HCPL-2730
6N139
HCPL-2731
Noise
Pulse
Noise
Shield
+
I
F
Shield
VCC
V
CC
Generator
tr = 5ns
+5 V
+5 V
0.1 µF
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
Pulse
Generator
tr = 5ns
ZO = 50
10% D.C.
I/ f< 100
ZO = 50
$
VF1
RL
IF
+
VB
V01
-
10% DUTY CYCLE
I/f < 100 µS
VO
RL
$
VF
-
(
s
C
L
= 15 µF*
VO
V02
VO
-
I
F
VF2
0.1 µF
MONITOR
IF Monitor
Rm
GND
Rm
+
C
L = 15 µF*
GND
Test Circuit for 6N138, 6N139
Test Circuit for HCPL-2730 and HCPL-2731
IF
0
5 V
VO
1.5 V
1.5 V
VOL
TPHL
TPLH
Fig. 22 Switching Time Test Circuit
*Includes Probe and Fixture Capacitance
IF
Noise
Shield
Noise
Shield
VCC
VCC
+
+5 V
+5 V
VO
1
8
7
6
5
1
2
3
4
8
7
6
5
IF
V
F1
RL
+
2
VB
V01
-
RL
A
VF
-
0.1 µF
A
B
VO
V02
-
VO
3
4
B
VFF
V
F2
0.1 µF
VFF
+
GND
GND
-
VCM
+
-
VCM
-
+
Pulse Gen
Pulse Gen
Test Circuit for 6N138 and 6N139
Test Circuit for HCPL-2730 and HCPL-2731
VCM 10 V
0 V
90% 90%
10%
tr
10%
tf
VO
5 V
Switch at A : I F = 0 mA
VO
VOL
Switch at B : I F = 1.6 mA
Fig. 23 Common Mode Immunity Test Circuit
12/27/99
200023A
QT [ QT OPTOELECTRONICS ]
