IC FOR OPTO DETECTOR
FUNCTIONAL DIAGRAM
+
Rtd1
Rtd2
+
IRD
PROXIMITY
+
Ro
Co
FO
+
+
D
BARRIER
T
:128
T1
:4
T2
C
+
short circuit
pulse
generatation
VCC
VZ
CSC
Csc
AM 336
+
+
current
regulation
RS
Rs
+
VS
Re
QC
P/B
IND
Cin
+
Rin
OUTA
Ra
Ca
INA
Rb
VR
ALR
I(Rd,Rh)
VTA
Rta
Rtb
VTB
B
A
FFA
D
Q
A
+
QO
FFB
D Q
B
+
T1
SC
A
B
+
A
X
L
L
H
T2
B
X
L
H
H
SC LED
L
T1
H
L
H
T2
H
H
+
LED
GN
RH
RD
Rd
Rh
+
Figure 1:
Functional circuit
FUNCTIONAL DESCRIPTION
GENERAL:
The AM 336 is designed for proximity and barrier applications with the possibility of external
synchronisation (mode selection by Pin P/B).
The circuit contains different functional modules.
Oscillator:
Oscillator thresholds refer to VCC/2, driver output for IR–LED, emitting–pulse length and duty
cycle adjusted by external components RO and CO.
Amplifier:
Current to voltage converter, ambient light rejection.
analog microelectronics
February 2005
4/12
AME [ ANALOG MICROELECTRONICS ]
