lt1002amj Linear Technology Corporation, lt1002amj Datasheet - Page 8

• Manufacturer Part Number: lt1002amj
• Description: Dual, Matched Precision Operational Amplifier
• Manufacturer: Linear Technology Corporation

APPLICATIONS
The LT1002 dual amplifier may be inserted directly into
OP-10, OP207, OP227 sockets with or without removal of
external nulling potentiometers.
Offset Voltage Adjustment The input offset voltage of the
LT1002, and its drift with temperature, are permanently
trimmed at wafer testing to a low level. However, if further
adjustment of V
potentiometer will not degrade drift with temperature.
Trimming to a value other than zero creates a drift of (V
300) V/ C, e.g. if V
drift will be 1 V/ C. The adjustment range with a 10k or
20k pot is approximately 2.5mV. If less adjustment
range is needed, the sensitivity and resolution of the
nulling can be improved by using a smaller pot in conjunc-
tion with fixed resistors. The example has an approximate
null range of 100 V.
In matching applications, both amplifiers can be trimmed
to zero, or the offset of one amplifier can be trimmed to
match the offset of the other. Offset adjustment, however,
slightly degrades the gain, common-mode and power-
supply rejection match between the two op amps. Fortu-
LT1002
TYPICAL PERFORMANCE CHARACTERISTICS
8
OS
is necessary, nulling with a 10k or 20k
16
12
OS
U
8
4
0
100
Output Swing vs. Load Resistance
NEGATIVE SWING
is adjusted to 300 V, the change in
INFORMATION
U
300
W
LOAD RESISTANCE ( )
POSITIVE SWING
U
1000
W
3k
V
T
S
A
= 25 C
= 15V
U
1002 G28
10k
OS
/
nately, the guaranteed offset voltage match of the LT1002
is very low, in most applications offset adjustment will be
unnecessary.
–10
–20
–30
–40
–50
50
40
30
20
10
0
Output Short Circuit Current
vs Time
TIME FROM OUTPUT SHORT (MINUTES)
INPUT
INPUT
Improved Sensitivity Adjustment
1
(10)
(11)
(10)
(11)
3
4
3
4
Standard Adjustment
1
1
–
+
–
+
(8)
(8)
LT1002
7.5k
LT1002
7.5k
10k
20k
1/2
–15V
1k
1/2
–15V
or
2
2
2
12 (5)
12 (5)
(9)
(9)
14
–55 C
V
125 C
–55 C
125 C
25 C
14 (7)
(7)
S
25 C
13 (6)
13 (6)
3
= 15V
15V
15V
1002 G29
OUTPUT
OUTPUT
1002 TA03
1002 TA04
4
1002fb