Datasheet

Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
±
18V
Power Dissipation (Package
Limitation) (Note 2) 500 mW
Operating Ambient Temperature Range
LF198/LF198A −55˚C to +125˚C
LF298 −25˚C to +85˚C
LF398/LF398A 0˚C to +70˚C
Storage Temperature Range −65˚C to +150˚C
Input Voltage Equal to Supply Voltage
Logic To Logic Reference
Differential Voltage (Note 3) +7V, −30V
Output Short Circuit Duration Indefinite
Hold Capacitor Short
Circuit Duration 10 sec
Lead Temperature (Note 4)
H package (Soldering, 10 sec.) 260˚C
N package (Soldering, 10 sec.) 260˚C
M package:
Vapor Phase (60 sec.) 215˚C
Infrared (15 sec.) 220˚C
Thermal Resistance (θ
JA
) (typicals)
H package 215˚C/W (Board mount in still air)
85˚C/W (Board mount in
400LF/min air flow)
N package 115˚C/W
M package 106˚C/W
θ
JC
(H package, typical) 20˚C/W
Electrical Characteristics
The following specifcations apply for −V
S
+ 3.5V ≤ V
IN
≤ +V
S
− 3.5V, +V
S
= +15V, −V
S
= −15V, T
A
=T
j
= 25˚C, C
h
= 0.01 µF,
R
L
=10kΩ, LOGIC REFERENCE = 0V, LOGIC HIGH = 2.5V, LOGIC LOW = 0V unless otherwise specified.
Parameter Conditions LF198/LF298 LF398 Units
Min Typ Max Min Typ Max
Input Offset Voltage, (Note 5) T
j
= 25˚C 1 3 2 7 mV
Full Temperature Range 5 10 mV
Input Bias Current, (Note 5) T
j
= 25˚C 5 25 10 50 nA
Full Temperature Range 75 100 nA
Input Impedance T
j
= 25˚C 10
10
10
10
Ω
Gain Error T
j
= 25˚C, R
L
= 10k 0.002 0.005 0.004 0.01 %
Full Temperature Range 0.02 0.02 %
Feedthrough Attenuation Ratio T
j
= 25˚C, C
h
= 0.01 µF 86 96 80 90 dB
at 1 kHz
Output Impedance T
j
= 25˚C, “HOLD” mode 0.5 2 0.5 4 Ω
Full Temperature Range 4 6 Ω
“HOLD” Step, (Note 6) T
j
= 25˚C, C
h
= 0.01 µF, V
OUT
= 0 0.5 2.0 1.0 2.5 mV
Supply Current, (Note 5) T
j
≥25˚C 4.5 5.5 4.5 6.5 mA
Logic and Logic Reference Input T
j
= 25˚C 2 10 2 10 µA
Current
Leakage Current into Hold T
j
= 25˚C, (Note 7) 30 100 30 200 pA
Capacitor (Note 5) Hold Mode
Acquisition Time to 0.1% ∆V
OUT
= 10V, C
h
= 1000 pF 4 4 µs
C
h
= 0.01 µF 20 20 µs
Hold Capacitor Charging Current V
IN
−V
OUT
=2V 5 5 mA
Supply Voltage Rejection Ratio V
OUT
= 0 80 110 80 110 dB
Differential Logic Threshold T
j
= 25˚C 0.8 1.4 2.4 0.8 1.4 2.4 V
Input Offset Voltage, (Note 5) T
j
= 25˚C 1 1 2 2 mV
Full Temperature Range 2 3 mV
Input Bias Current, (Note 5) T
j
= 25˚C 5 25 10 25 nA
Full Temperature Range 75 50 nA
LF198/LF298/LF398, LF198A/LF398A
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