ALD2321A/ALD2321B/ALD2321 Advanced Linear Devices 8 of 11
PINS OUT
1,
OUT
1H,
OUT
2,
OUT
2H,
INTERNAL CIRCUIT CONFIGURATIONS
RESPONSE TIME MEASUREMENT CIRCUIT
E-TRIM CIRCUIT
+
OUT
OUT
H
Input
Offset
Trim
Circuit
Level
Shift/
Scaling
VE
1x
*
Input
Offset
Trim
Circuit
Level
Shift/
Scaling
VE
2x
*
+IN
-IN
-
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
LIMIT2
PHOTO-
DETECTOR
LIGHT
-
-
+
+
LED
BUZZER
V
LIMIT 1
V
External
1/2 ALD2321
1/2 ALD2321
LED turns on as photo-detector
voltage reaches V
LIMIT
1.
Both LED and horn turns on as photo-
detector voltage reachesV
LIMIT
2.
V
EXTERNAL
= +12V, V+ = +5V
DUAL LIMIT PHOTO DETECTOR MONTOR
DUAL LIMIT WINDOW COMPARTOR
+
+
-
-
1/2 ALD2321
OUTPUT HIGH FOR V
IN
<V
REF(HIGH)
R
LOAD
= 1.5KΩ
AND V
IN
> V
REF(LOW)
V
OUT
V
+
V
REF(HIGH)
1/2 ALD2321
V
REF(LOW)
R
LOAD
V
IN
* These pins should be isolated by surrounding them with ground trace in user's applications.
OUT
1
V
+
OUT
1H
OUT
1
OUT
2
V
+
OUT
2H
OUT
2
+
-
5.1KΩ
OUT
+5V
10X INPUT STEP
1KΩ
9KΩ
V
IN
TYPICAL APPLICATIONS (cont'd)
