LT1457 Linear Technology, LT1457 Datasheet

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LT1457

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

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APPLICATIONS
FEATURES
TYPICAL PERFORMANCE CHARACTERISTICS
Sample-and-Hold (Drives Large Hold Capacitors)
A/D and D/A Converters
Photodiode Amplifiers
Voltage-to-Frequency Converters
Handles 10,000pF Capacitive Load
450 V Max Offset Voltage
1200 V Max Offset Voltage in S8 Package
50pA Bias Current at 70 C
13nV/ Hz Voltage Noise
4V/ s Slew Rate
4 V/ C Drift
130dB Channel Separation
100
80
60
40
20
0
0.1
V
T
A
A
S
V
Capacitive Load Handling
= 25 C
= ±15V
= +1
U
CAPACITIVE LOAD (nF)
1
W
10
U
LT11457• TA01
100
DESCRIPTION
The LT1457 is a dual, JFET input op amp optimized for
handling large capacitive loads in combination with preci-
sion performance.
Precision specifications include 220 V offset voltage in
plastic and surface mount packages. At 70 C input bias
current is 50pA, input offset current is 20pA. Channel
separation is 130dB.
Other dual JFET input op amps from Linear Technology
include the LT1057, which is three times faster than the
LT1457 but at the expense of significantly lower capacitive
load handling capability; and the LT1113 with 4.5nV/ Hz
voltage noise.
21
18
15
12
9
6
3
0
–1.0
Input Offset Voltage Distribution
–0.8
JFET Input Op Amp
V
T
S
A
= 15V
= 25 C
–0.6
INPUT OFFSET VOLTAGE (mV)
U
–0.4
S8 Package
–0.2
Dual, Precision
0
0.2
400 DUALS
(800 OP AMPS)
TESTED FROM
3 RUNS
0.4
0.6
LT1457 • TA02
0.8
1.0
LT1457
1

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LT1457 Summary of contents

Page 1

... CAPACITIVE LOAD (nF) DESCRIPTION The LT1457 is a dual, JFET input op amp optimized for handling large capacitive loads in combination with preci- sion performance. Precision specifications include 220 V offset voltage in plastic and surface mount packages input bias current is 50pA, input offset current is 20pA. Channel separation is 130dB ...

Page 2

... ORDER PART TOP VIEW NUMBER + OUT B LT1457ACN8 A 6 –IN B LT1457CN8 B + PACKAGE = 115 C, = 130 TOP VIEW LT1457S8 8 – OUT OUT PART MARKING S8 PACKAGE 1457 = 130 C, = 190 unless otherwise noted. (Note 1) LT1457AC LT1457C/LT1457S8 ...

Page 3

... Note 1: Typical parameters are defined as the 60% yield of distributions of individual amplifiers; i.e., out of 100 LT1457s (200 op amps) typically 120 will be better than the indicated specification. Note 2: This parameter is tested on a sample basis only. ...

Page 4

... TEMPERATURE ( C) LT1457 • TPC05 0.1Hz to 10Hz Noise V = ±15V TIME (SECONDS) LT1457 • TPC08 Warm-Up Drift 150 V = ±15V 120 S8 PACKAGE PACKAGE TIME AFTER POWER ON (MINUTES) LT1457 • ...

Page 5

... C 120 100 POSITIVE SUPPLY 80 60 NEGATIVE SUPPLY 10M 10 100 1k 10k 100k FREQUENCY (Hz) LT11457• TPC17 75 100 LT1457 • TPC12 T = – – LT1457 • TPC15 10M LT1457• TPC13 5 ...

Page 6

... LF412A in the unity gain follower mode (B), and the response of the LT1457 (C). The phase reversal of photo (B) can cause lock-up in servo systems. The LT1457 does not phase-reverse due to a unique phase reversal protection circuit. LT1457 AI02 (B) LF412A Output Small-Signal Response ...

Page 7

... R and R in the kilohm range, this pole can create S F 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 ( parallel with R eliminates this problem. With R F ...

Page 8

... LT1457 NORTHEAST REGION Linear Technology Corporation One Oxford Valley 2300 E. Lincoln Hwy.,Suite 306 Langhorne, PA 19047 Phone: (215) 757-8578 FAX: (215) 757-5631 Linear Technology Corporation 266 Lowell St., Suite B-8 Wilmington, MA 01887 Phone: (508) 658-3881 FAX: (508) 658-2701 FRANCE Linear Technology S.A.R.L. Immeuble "Le Quartz" ...

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