LT1457 Linear Technology, LT1457 Datasheet - Page 7

• Manufacturer Part Number: LT1457
• Description: Dual/ Precision JFET Input Op Amp
• Manufacturer: Linear Technology

0°– 8° TYP
APPLICATIONS
PACKAGE
High Speed Operation
When the feedback around the op amp is resisitive (R
pole will be created with R
capacitance (R
(C
with R
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
(C
+ C
removed.
IN
F
) in parallel with R
IN
) = R
S
4pF). In low closed loop gain configurations and
and R
(7.620 – 8.128)
(0.229 – 0.381)
0.300 – 0.320
0.009 – 0.015
F
0.325
8.255
C
F
0.016 – 0.050
0.406 – 1.270
, the effect of the feedback pole is completely
+0.635
–0.381
(0.254 – 0.508)
–0.015
+0.025
0.010 – 0.020
F
S
, C
in the kilohm range, this pole can create
DESCRIPTION
S
U
), and the amplifier input capacitance
F
eliminates this problem. With R
INFORMATION
45
(0.203 – 0.254)
U
0.008 – 0.010
F
, the source resistance and
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.
(1.143 ± 0.381)
0.045 ± 0.015
(1.651)
0.065
TYP
(2.540 ± 0.254)
W
(1.346 – 1.752)
0.100 ± 0.010
0.053 – 0.069
U
(0.355 – 0.483)
0.014 – 0.019
(1.143 – 1.651)
0.045 – 0.065
Dimension in inches (millimeters) unless otherwise noted.
U
8-Lead Plastic SOIC
8-Lead Plastic DIP
S
F
(C
), a
N8 Package
S8 Package
S
(0.457 ± 0.076)
0.018 ± 0.003
(1.270)
0.050
BSC
(3.302 ± 0.127)
0.130 ± 0.005
(3.175)
(0.101 – 0.254)
0.125
MIN
0.004 – 0.010
R
(0.508)
0.020
S
MIN
(5.791 – 6.197)
0.228 – 0.244
C
S
8
1
–
+
8
1
R
C
F
F
2
7
(10.160)
0.400
MAX
(4.801 – 5.004)
0.189 – 0.197
C
7
2
IN
6
3
6
3
4
5
5
LT1457 AI04
4
OUTPUT
(6.350 ± 0.254)
LT1457
0.250 ± 0.010
(3.810 – 3.988)
0.150 – 0.157
N8 0392
SO8 0392
7