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Fabricante

LT1124

Dual/Quad Low Noise, High Speed Precision Op Amps

Linear Technology 

LT1124/LT1125

Applications Information

The LT1124 may be inserted directly into OP-270 sock-

ets. The LT1125 plugs into OP-470 sockets. Of course,

all standard dual and quad bipolar op amps can also be

replaced by these devices.

(5µV/V). However, Table 1 can be used to estimate the

expected matching performance between the two sides of

the LT1124, and between amplifiers A and D, and between

amplifiers B and C of the LT1125.

Matching Specifications

In many applications the performance of a system depends

on the matching between two op amps, rather than the

individual characteristics of the two devices. The three op

amp instrumentation amplifier configuration shown in this

data sheet is an example. Matching characteristics are not

100% tested on the LT1124/LT1125.

Some specifications are guaranteed by definition. For

example, 70µV maximum offset voltage implies that mis-

match cannot be more than 140µV. 112dB (= 2.5µV/V)

CMRR means that worst-case CMRR match is 106dB

Offset Voltage and Drift

Thermocouple effects, caused by temperature gradients

across dissimilar metals at the contacts to the input termi-

nals, can exceed the inherent drift of the amplifier unless

proper care is exercised. Air currents should be minimized,

package leads should be short, the two input leads should

be close together and maintained at the same temperature.

The circuit shown in Figure 1 to measure offset voltage

is also used as the burn-in configuration for the LT1124/

LT1125, with the supply voltages increased to ±16V.

50k*

15V

–

100Ω*

+

50k*

–15V

VOUT

VOUT = 1000VOS

*RESISTORS MUST HAVE LOW

THERMOELECTRIC POTENTIAL

1124/25 F01

Figure 1. Test Circuit for Offset Voltage and

Offset Voltage Drift with Temperature

Table 1. Expected Match

PARAMETER

VOS Match, ∆VOS

LT1124

LT1125

Temperature Coefficient Match

Average Noninverting IB

Match of Noninverting IB

CMRR Match

PSRR Match

LT1124AC/AM

LT1125AC/AM

50% YIELD

98% YIELD

20

110

30

150

0.35

1.0

6

18

7

22

126

115

127

118

LT1124C/M

LT1125C/M

50% YIELD

98% YIELD

30

130

50

180

0.5

1.5

7

25

8

30

123

112

127

114

UNITS

µV

µV

µV/°C

nA

nA

dB

dB

10

For more information www.linear.com/LT1124

11245ff

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