LT1124/LT1125
Dual/Quad Low Noise,
High Speed Precision Op Amps
DESCRIPTIO
The LT
®
1124 dual and LT1125 quad are high performance
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
and I
OS
than the OP-27; lower V
OS
and noise
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.
FEATURES
s
s
s
s
s
s
s
s
s
100% Tested Low Voltage Noise: 2.7nV/√Hz Typ
4.2nV/√Hz Max
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
APPLICATIO S
s
s
s
s
s
s
s
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.
Protected by U.S. patents 4,775,884 and 4,837,496.
TYPICAL APPLICATIO
3
Instrumentation Amplifier with Shield Driver
+
1/4
LT1125
1
1k
R
F
3.4k
5
30k
Input Offset Voltage Distribution
(All Packages, LT1124 and LT1125)
V
S
=
±
15V
T
A
= 25°C
758 DUALS
200 QUADS
2316 UNITS
TESTED
2
–
15V
30
GUARD
+
INPUT
–
GUARD
+
8
1/4
LT1125
10
OUTPUT
30k
6
R
G
100Ω
–
PERCENT OF UNITS
R
G
100Ω
+
4
1/4
LT1125
11
–15V
7
20
–
9
10
13
–
1/4
LT1125
14
R
F
3.4k
1k
GAIN = 30 (1 + R
F
/R
G
)
≈
1000
POWER BW = 170kHz
SMALL-SIGNAL BW = 400kHz
NOISE = 3.8µV/
√
Hz AT OUTPUT
V
OS
= 35µV
0
–100
12
+
1124/25 TA01
U
U
U
20
60
– 60
– 20
INPUT OFFSET VOLTAGE (µV)
100
1124/25 TA02
1
LINER [ LINEAR TECHNOLOGY ]
