am336-2 AME, Inc., am336-2 Datasheet - Page 7

• Manufacturer Part Number: am336-2
• Description: Ic For Opto Detector - Analog Microelectronics
• Manufacturer: AME, Inc.

IC FOR OPTO DETECTOR
close as possible to the pin to prevent noise. Also, in case of high emission-currents, blocking
capacitors against V
The comparator signals are taken over into the flip–flops with the positive slope of the IRD–signal.
Connections pins: IND, RD, RH
OUTPUT STAGES:
There are two antivalent output drivers for external PNP Darlington transistors with a current
limitation and periodical shut down in case of overload (short circuit protection).
The output signal of the internal flip-flop A (depending on VT
consist of current sources which are attached to an internal pull-up resistor. The voltage drop at the
resistor RS, produced by the loading current, is compared with an internal voltage and is used to
limit the loading current. When limitation occurs, the external capacitor C
reaching the internal threshold both output drivers are switched off. After loading the capacitor C
is discharged and by reaching the threshold both output drivers are switched off. After charging the
capacitor C
Unused outputs have to be attached to V
that the necessary potential (V
current.
Connection pins : QO, QC, RS, CSC
LED DRIVER:
The push–pull driver for the LED indicates the different ranges of the window–comparator or short
circuit of the output stages.
Following conditions are possible:
Tabelle 3: LED indications
Blinking frequencies for LED:
analog microelectronics
A
X
H
L
L
T
T
Connection pin: LED
1
2
: oscillator frequency for devided by 128
: oscillator frequency for devided by 512
B
X
H
H
L
SC
to the upper threshold the output stages are enabled again.
SC
H
H
H
L
CC
are useful.
LED
T
T
H
L
1
2
short circuit, input voltage at IND has no effect
input voltage at IND is higher than VT
input voltage is higher than VT
input voltage is smaller than VT
CC
–2 u V
BE
CC
) is available at the outputs in order to limit the loading
. External PNP Darlington transistors have to be used so
A,
A
but smaller than VT
and VT
A
A
and VT
) controls the output drivers. They
B
B
B
SC
is discharged and by
AM 336
February 2005
7/12
SC