LT1457 データシートの表示（PDF） - Linear Technology
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LT1457 Datasheet PDF : 8 Pages
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APPLICATIONS INFORMATION
High Speed Operation
When the feedback around the op amp is resisitive (RF), a
pole will be created with RF, the source resistance and
capacitance (RS, CS), and the amplifier input capacitance
(CIN ≈ 4pF). In low closed loop gain configurations and
with RS and RF in the kilohm range, this pole can create
excess phase shift and even oscillation on high speed
amplifiers. Because the LT1457’s phase margin is very
high, this problem is minimal. However, a small capacitor
(CF) in parallel with RF eliminates this problem. With RS(CS
+ CIN) = RFCF, the effect of the feedback pole is completely
removed.
LT1457
CF
RF
–
RS
CS
CIN
+
OUTPUT
LT1457 AI04
PACKAGE DESCRIPTION Dimension in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead Plastic DIP
0.300 – 0.320
(7.620 – 8.128)
0.009 – 0.015
(0.229 – 0.381)
+0.025
0.325 –0.015
( ) 8.255
+0.635
–0.381
0.045 – 0.065
(1.143 – 1.651)
0.065
(1.651)
TYP
0.045 ± 0.015
(1.143 ± 0.381)
0.100 ± 0.010
(2.540 ± 0.254)
0.130 ± 0.005
(3.302 ± 0.127)
0.125
(3.175)
MIN
0.020
(0.508)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.400
(10.160)
MAX
8
7
6
5
0.250 ± 0.010
(6.350 ± 0.254)
12
34
N8 0392
0°– 8° TYP
S8 Package
8-Lead Plastic SOIC
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.053 – 0.069
(1.346 – 1.752)
0.008 – 0.010
(0.203 – 0.254)
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
BSC
0.228 – 0.244
(5.791 – 6.197)
0.189 – 0.197
(4.801 – 5.004)
8
7
6
5
0.150 – 0.157
(3.810 – 3.988)
1
2
34
SO8 0392
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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