TYPICAL APPLICATIONS (cont'd)
DUAL LIMIT WINDOW COMPARTOR
DUAL LIMIT PHOTO DETECTOR MONTOR
V
External
V+
+
V
1/2 ALD2321
BUZZER
R
LOAD
V
+
-
REF(HIGH)
1/2 ALD2321
LED
V
LIMIT2
+
V
OUT
-
+
-
V
IN
V
LIMIT 1
LIGHT
PHOTO-
+
V
REF(LOW)
1/2 ALD2321
-
DETECTOR
R
LOAD
= 1.5KΩ
1/2 ALD2321
OUTPUT HIGH FOR V <V
AND V > V
IN REF(LOW)
IN REF(HIGH)
LED turns on as photo-detector
voltage reaches V 1.
LIMIT
Both LED and horn turns on as photo-
detector voltage reachesV 2.
LIMIT
= +12V, V+ = +5V
V
EXTERNAL
RESPONSE TIME MEASUREMENT CIRCUIT
PINS OUT OUT
1,
OUT OUT
2,
1H,
2H,
INTERNAL CIRCUIT CONFIGURATIONS
Response time is defined as the internal between the
application of an input step function and the instant
when the output reaches 50% of its maximum value
as measured by the following test circuit:
+
+
V
V
+5V
OUT
1
OUT
2
OUT
1H
OUT
OUT
2H
5.1KΩ
10X INPUT STEP
OUT
-
1
2
9KΩ
OUT
V
+
IN
1KΩ
E-TRIM CIRCUIT
-IN
-
OUT
H
OUT
+
+IN
Input
Level
Offset
Trim
Circuit
Shift/
Scaling
VE
VE
*
*
1x
Input
Level
Offset
Shift/
Scaling
2x
Trim
Circuit
* These pins should be isolated by surrounding them with ground trace in user's applications.
ALD2321A/ALD2321B/ALD2321
Advanced Linear Devices
8 of 11
ALD [ ADVANCED LINEAR DEVICES ]
