LT1125 Linear Technology Corporation, LT1125 Datasheet - Page 10

• Manufacturer Part Number: LT1125
• Description: Dual/quad Low Noise, High Speed Precision Op Amps
• Manufacturer: Linear Technology Corporation

LT1124/LT1125
PERFOR A CE CO PARISO
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,
Table 2. Guaranteed Performance, V
PARAMETER/UNITS
Voltage Noise, 1kHz
Slew Rate
Gain Bandwidth Product
Offset Voltage
Offset Current
Bias Current
Supply Current/Amp
Voltage Gain, R
Common Mode Rejection Ratio
Power Supply Rejection Ratio
SO-8 Package
TYPICAL
10
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.
Gain 1000 Amplifier with 0.01% Accuracy, DC to 1Hz
L
= 2k
W U
365Ω
1%
A
LT1124
LT1125
LT1124
LT1125
PPLICATI
INPUT
340k
2
3
1%
–
+
1/2 LT1124
–15V
15V
15k
5%
Yes - LT1124
100% Tested
100% Tested
100% Tested
4
LT1124CN8
W
6 (S0-8)
8 (N8)
O
LT1125CN
S
= ±15V, T
2.75
RN60C FILM RESISTORS
100
140
106
110
4.2
2.7
8.0
1.5
20
30
30
U
7 (SO-8)
1 (N8)
TRIM
20k
S
A
= 25°C, Low Cost Devices
OUTPUT
U
Sample Tested
1124/25 TA03
Not Tested
Not Tested
OP-27 GP
5.67
100
100
Yes
4.5
1.7
5.0
0.7
75
80
94
–
–
but in most cases are superior. Normally dual and quad
performance is degraded when compared to singles, for
the LT1124/LT1125 this is not the case.
Gain Error vs Frequency Closed-Loop Gain = 1000
0.001
OP-270 GP
0.01
No Limit
No Limit
1.0
0.1
3.25
0.35
250
104
1.7
No
0.1
20
60
90
–
–
–
–
PRECISION
TYPICAL
OP AMP
GAIN ERROR =
FREQUENCY (Hz)
1
Sample Tested
LT1124/LT1125
CLOSED-LOOP GAIN
OP-470 GP
OPEN-LOOP GAIN
No Limit
1000
2.75
100
105
5.0
1.4
0.4
30
60
10
–
–
–
–
1124/25 TA04
100
nV/√Hz
UNITS
11245fb
V/µV
V/µs
MHz
mA
µV
µV
nA
nA
nA
dB
dB