LT1097_15 Datasheet, PDF (10/12 Pages) Linear Technology – Low Cost, Low Power Precision Op Amp

LT1097
APPLICATIONS INFORMATION
The availability of the compensation terminal permits the use
of feedforward frequency compensation to enhance slew
rate. The voltage follower feedforward scheme bypasses the
amplifier’s gain stages and slews at nearly 10V/µs.
The inputs of the LT1097 are protected with back-to-back
diodes. In the voltage follower configuration, when the
input is driven by a fast, large signal pulse (>1V), the input
protection diodes effectively short the output to the input
during slewing, and a current, limited only by the output
short circuit protection will flow through the diodes.
The use of a feedback resistor, as shown in the voltage
follower feedforward diagram, is recommended because
this resistor keeps the current below the short circuit limit,
resulting in faster recovery and settling of the output.
Follower Feedforward
Compensation
50pF
10k
5k
IN
2_–
LT1097
6
OUT
3₊
5
0.01µF
LT1097•F03
Pulse Response of Feedforward
Compensation
5µs/DIV
1097 G20
Test Circuit for Offset Voltage and
its Drift with Temperature
50k*
15V
2_– ⁷
100Ω*
LT1097
6
V_O
3₊
4
50k*
–15V
V_O = 1000V_OS
*RESISTORS MUST HAVE LOW
THERMOELECTRIC POTENTIAL
LT1097•F04
TYPICAL APPLICATIO
Low Power Comparator with <10µV Hysteresis
5V
1k
330k
7
+IN ^{10k 2} –
1
6
LT1097
–IN ^{10k 3} ₊
620k
100k
4
100k
OUT
2N3904
–5V
LT1097•TA02
10