LT1124/LT1125
perForMance coMparison
Table 2 summarizes the performance of the LT1124/LT1125
compared to the low cost grades of alternate approaches.
The comparison shows how the specs of the LT1124/
LT1125 not only stand up to the industry standard OP-27,
but in most cases are superior. Normally dual and quad
Table 2. Guaranteed Performance, V
S
= ±15V, T
A
= 25°C, Low Cost Devices
PARAMETER/UNITS
Voltage Noise, 1kHz
Slew Rate
Gain-Bandwidth Product
Offset Voltage
Offset Current
Bias Current
Supply Current/Amp
Voltage Gain, R
L
= 2k
Common Mode Rejection Ratio
Power Supply Rejection Ratio
SO-8 Package
LT1124
LT1125
LT1124
LT1125
LT1124CN8
LT1125CN
4.2
100% Tested
2.7
100% Tested
8.0
100% Tested
100
140
20
30
30
2.75
1.5
106
110
Yes – LT1124
OP-27 GP
4.5
Sample Tested
1.7
Not Tested
5.0
Not Tested
100
–
75
–
80
5.67
0.7
100
94
Yes
OP-270 GP
–
No Limit
1.7
–
No Limit
250
–
20
–
60
3.25
0.35
90
104
No
OP-470 GP
5.0
Sample Tested
1.4
–
No Limit
–
1000
–
30
60
2.75
0.4
100
105
–
UNITS
nV/√Hz
V/µs
MHz
µV
µV
nA
nA
nA
mA
V/µV
dB
dB
performance is degraded when compared to singles, for
the LT1124/LT1125 this is not the case.
Typical applicaTions
Gain 1000 Amplifier with 0.01% Accuracy, DC to 1Hz
340k
1%
15k
5%
15V
20k
TRIM
Gain Error vs Frequency Closed-Loop Gain = 1000
1.0
TYPICAL
PRECISION
OP AMP
0.1
365
1%
–
1/2 LT1124
OUTPUT
+
RN60C FILM RESISTORS
INPUT
–15V
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 “GAIN PRECISION —
BANDWIDTH PRODUCT” IS 75 TIMES HIGHER, AS SHOWN.
1124/25 TA03
GAIN ERROR (PERCENT)
0.01
LT1124/LT1125
GAIN ERROR =
0.001
0.1
CLOSED-LOOP GAIN
OPEN-LOOP GAIN
100
1124/25 TA04
1
10
FREQUENCY (Hz)
12
11245ff
For more information
LINER [ LINEAR TECHNOLOGY ]
