LT1125

Manufacturer Part NumberLT1125
DescriptionDual/quad Low Noise, High Speed Precision Op Amps
ManufacturerLinear Technology Corporation
LT1125 datasheet
 


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FEATURES
100% Tested Low Voltage Noise: 2.7nV/√Hz Typ
Slew Rate: 4.5V/µs Typ
Gain Bandwidth Product: 12.5MHz Typ
Offset Voltage, Prime Grade: 70µV Max
Low Grade: 100µV Max
High Voltage Gain: 5 Million Min
Supply Current Per Amplifier: 2.75mA Max
Common Mode Rejection: 112dB Min
Power Supply Rejection: 116dB Min
Available in 8-Pin SO Package
U
APPLICATIO S
Two and Three Op Amp Instrumentation Amplifiers
Low Noise Signal Processing
Active Filters
Microvolt Accuracy Threshold Detection
Strain Gauge Amplifiers
Direct Coupled Audio Gain Stages
Tape Head Preamplifiers
Infrared Detectors
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 4775884, 4837496.
U
TYPICAL APPLICATIO
Instrumentation Amplifier with Shield Driver
3
+
1
1/4
LT1125
2
GUARD
10
+
+
8
1/4
INPUT
LT1125
9
GUARD
13
14
1/4
LT1125
12
+
Dual/Quad Low Noise,
High Speed Precision Op Amps
DESCRIPTIO
®
The LT
1124 dual and LT1125 quad are high performance
4.2nV/√Hz Max
op amps that offer higher gain, slew rate and bandwidth
than the industry standard OP-27 and competing OP-270/
OP-470 op amps. In addition, the LT1124/LT1125 have
lower I
B
than the OP-270/OP-470.
In the design, processing and testing of the device, par-
ticular attention has been paid to the optimization of the
entire distribution of several key parameters. Slew rate,
gain bandwidth and 1kHz noise are 100% tested for each
individual amplifier. Consequently, the specifications of
even the lowest cost grades (the LT1124C and the
LT1125C) have been spectacularly improved compared
to equivalent grades of competing amplifiers.
Power consumption of the LT1124 is one half of two
OP-27s. Low power and high performance in an 8-pin SO
package make the LT1124 a first choice for surface mounted
systems and where board space is restricted.
For a decompensated version of these devices, with three
times higher slew rate and bandwidth, please see the
LT1126/LT1127 data sheet.
1k
30k
R
F
15V
3.4k
5
4
+
R
G
7
1/4
100Ω
OUTPUT
LT1125
6
11
R
30k
G
100Ω
–15V
) ≈ 1000
GAIN
= 30 (1 + R
/R
F
G
POWER BW
= 170kHz
SMALL-SIGNAL BW
= 400kHz
R
F
NOISE
= 3.8µV/ Hz AT OUTPUT
3.4k
V
= 35µV
OS
1k
1124/25 TA01
LT1124/LT1125
U
and I
than the OP-27; lower V
OS
OS
Input Offset Voltage Distribution
(All Packages, LT1124 and LT1125)
= ± 15V
758
DUALS
V
S
200
QUADS
T
= 25°C
A
30
2316 UNITS
TESTED
20
10
0
–100
– 60
– 20
20
60
INPUT OFFSET VOLTAGE (µV)
1124/25 TA02
and noise
100
11245fb
1

LT1125 Summary of contents

  • Page 1

    ... Dual/Quad Low Noise, High Speed Precision Op Amps DESCRIPTIO ® The LT 1124 dual and LT1125 quad are high performance 4.2nV/√Hz Max op amps that offer higher gain, slew rate and bandwidth than the industry standard OP-27 and competing OP-270/ OP-470 op amps. In addition, the LT1124/LT1125 have ...

  • Page 2

    ... Consult LTC Marketing for parts specified with wider operating temperature ranges (Note 1) Operating Temperature Range LT1124AC/LT1124C LT1125AC/LT1125C (Note 10) .......... – 40°C to 85°C LT1124AI/LT1124I ............................ – 40°C to 85°C LT1124AM/LT1124M LT1125AM/LT1125M OBSOLETE .... – 55°C to 125° ORDER PART NUMBER OUT A 1 –IN A ...

  • Page 3

    ... OUT ≥ 2k ±10V ● OUT ≥ 2k ±12.5 ● ≥ 2k (Notes 3, 7) ● R 2.3 L ● LT1124/LT1125 LT1124C/I/M LT1125AC/AM LT1125C/M TYP MAX MIN TYP MAX 100 140 0.3 0 ±7 ±20 ±8 ±30 ...

  • Page 4

    ... Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Typical parameters are defined as the 60% yield of parameter distributions of individual amplifiers; i.e., out of 100 LT1125s (or 100 LT1124s) typically 240 op amps (or 120) will be better than the indicated specification. ...

  • Page 5

    ... Common Mode Rejection Ratio vs Frequency 160 T = 25° ±15V V 140 S = ±10V V CM 120 100 10k 100k 1M FREQUENCY (Hz) 1124/25 G08 LT1124/LT1125 Voltage Noise vs Frequency 100 30 10 MAXIMUM 3 TYPICAL 1/f CORNER 2.3Hz 1 0.1 1.0 10 100 100 FREQUENCY (Hz) Output Short-Circuit Current vs Time 50 = ±15V ...

  • Page 6

    ... Voltage Gain vs Temperature 20 18 LT1124AM/LT1125AM 10k L 14 LT1124M/LT1125M 12 ± 15V S 10 ± 10V OUT LT1124AM/LT1125AM LT1124M/LT1125M 0 –75 –50 – 100 TEMPERATURE (°C) 1124/25 G11 Offset Voltage Drift with Temperature of Representative Units 50 = ±15V –10 – ...

  • Page 7

    ... –1, –10, –100 V MEASUREMENT BANDWIDTH 0.1 = 10Hz TO 22kHz 0.010 A = –100 –10 V 0.001 A = –1 V 0.0001 30 0 OUTPUT SWING (Vp-p) LT1124/LT1125 Warm-Up Drift 10 = ±15V 25° PACKAGE PACKAGES 10M TIME AFTER POWER ON (MINUTES) 1124/25 G20 Total Harmonic Distortion ...

  • Page 8

    ... A PPLICATI S I FOR ATIO The LT1124 may be inserted directly into OP-270 sockets. The LT1125 plugs into OP-470 sockets. Of course, all standard dual and quad bipolar op amps can also be replaced by these devices. Matching Specifications In many applications the performance of a system de- pends on the matching between two op amps, rather than the individual characteristics of the two devices ...

  • Page 9

    ... F F Each individual amplifier is tested to 4.2nV/√Hz voltage noise; i.e., for the LT1124 two tests, for the LT1125 four tests are performed. Noise testing for competing multiple op amps, if done at all, may be sample tested or tested using the circuit shown in Figure 4. ...

  • Page 10

    ... RN60C FILM RESISTORS –15V INPUT THE HIGH GAIN AND WIDE BANDWIDTH OF THE LT1124/LT1125, IS USEFUL IN LOW FREQUENCY HIGH CLOSED-LOOP GAIN AMPLIFIER APPLICATIONS. A TYPICAL PRECISION OP AMP MAY HAVE AN OPEN-LOOP GAIN OF ONE MILLION WITH 500kHz BANDWIDTH. AS THE GAIN ERROR PLOT SHOWS, THIS DEVICE IS CAPABLE OF 0.1% AMPLIFYING ACCURACY UP TO 0.3Hz ONLY. EVEN INSTRUMENTATION RANGE SIGNALS CAN VARY AT A FASTER RATE. THE LT1124/LT1125 “ ...

  • Page 11

    ... AGRA I S CHE TI Q7 21k Q9 Q13 Q8 Q10 – V NONINVERTING INPUT (+) Q1A Q1B Q3 INVERTING INPUT (–) (1/2 LT1124, 1/4 LT1125) 360µA 200pF 21k 3.6k Q17 Q19 Q20 Q2A Q2B + V Q22 Q11 Q12 Q15 Q16 200µA 100µA 200Ω 6k LT1124/LT1125 570µA 100µ ...

  • Page 12

    ... LT1124/LT1125 PACKAGE DESCRIPTIO .045 – .068 (1.143 – 1.650) FULL LEAD OPTION .300 BSC (7.62 BSC) .008 – .018 (0.203 – 0.457) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) + ...

  • Page 13

    ... TYP .016 – .050 .014 – .019 (0.406 – 1.270) (0.355 – 0.483) TYP INCHES (MILLIMETERS) LT1124/LT1125 .189 – .197 (4.801 – 5.004) NOTE .150 – .157 (3.810 – 3.988) ...

  • Page 14

    ... LT1124/LT1125 PACKAGE DESCRIPTIO .300 BSC (7.62 BSC) .008 – .018 (0.203 – 0.457) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) +.035 .325 –.015 ( ) +0.889 8.255 –0.381 ...

  • Page 15

    ... NOTE 3 N .093 – .104 × 45° (2.362 – 2.642) 0° – 8° TYP .050 (1.270) BSC .014 – .019 (0.356 – 0.482) TYP LT1124/LT1125 .398 – .413 (10.109 – 10.490) NOTE .394 – .419 (10.007 – 10.643) N ...

  • Page 16

    ... THE LT1124/LT1125 IS CAPABLE OF PROVIDING EXCITATION CURRENT DIRECTLY TO BIAS THE 350Ω BRIDGE AT 5V WITH ONLY 5V ACROSS THE BRIDGE (AS OPPOSED 1 TO THE USUAL 10V) TOTAL POWER DISSIPATION AND BRIDGE WARM-UP DRIFT IS REDUCED. THE BRIDGE OUTPUT SIGNAL IS HALVED, BUT THE LT1124/LT1125 CAN AMPLIFY THE REDUCED SIGNAL ACCURATELY. REFERENCE OUTPUT ...