LT1125CN Просмотр технического описания (PDF) - Linear Technology

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LT1125CN

Dual/Quad Low Noise, High Speed Precision Op Amps

Linear Technology 

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

performance is degraded when compared to singles, for

the LT1124/LT1125 this is not the case.

Table 2. Guaranteed Performance, VS = ±15V, TA = 25°C, Low Cost Devices

PARAMETER/UNITS

LT1124CN8

LT1125CN

OP-27 GP

Voltage Noise, 1kHz

4.2

100% Tested

4.5

Sample Tested

Slew Rate

2.7

100% Tested

1.7

Not Tested

Gain-Bandwidth Product

8.0

100% Tested

5.0

Not Tested

Offset Voltage LT1124

100

100

LT1125

140

–

Offset Current LT1124

20

75

LT1125

30

–

Bias Current

30

80

Supply Current/Amp

2.75

5.67

Voltage Gain, RL = 2k

1.5

0.7

Common Mode Rejection Ratio

106

100

Power Supply Rejection Ratio

110

94

SO-8 Package

Yes – LT1124

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

Typical Applications

Gain 1000 Amplifier with 0.01% Accuracy, DC to 1Hz

Gain Error vs Frequency Closed-Loop Gain = 1000

340k

1%

15k

5%

20k

TRIM

365Ω

1%

15V

–

1/2 LT1124

+

OUTPUT

INPUT

RN60C FILM RESISTORS

–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

1.0

TYPICAL

PRECISION

OP AMP

0.1

LT1124/LT1125

0.01

0.001

0.1

GAIN

ERROR

=

CLOSED-LOOP GAIN

OPEN-LOOP GAIN

1

10

FREQUENCY (Hz)

100

1124/25 TA04

12

For more information www.linear.com/LT1124

11245ff

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