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LT1124/LT1125

APPLICATI

I FOR ATIO

The LT1124 may be inserted directly into OP-270 sockets.

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

standard dual and quad bipolar op amps can also be

replaced by these devices.

Matching Specifications

In many applications the performance of a system de-

pends 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, 70

µV maximum offset voltage implies that mis-

match cannot be more than 140

µV. 112dB (= 2.5µV/V)

CMRR means that worst case CMRR match is 106dB

Table 1. Expected Match

LT1124AC/AM

LT1124C/M

LT1125AC/AM

LT1125C/M

PARAMETER

50% YIELD

98% YIELD

50% YIELD

98% YIELD

UNITS

VOS Match, ∆VOS

LT1124

110

130

µV

LT1125

150

180

µV

Temperature Coefficient Match

0.35

1.0

0.5

1.5

µV/°C

Average Noninverting IB

618

Match of Noninverting IB

722

CMRR Match

126

115

123

112

PSRR Match

127

118

127

114

Figure 1. Test Circuit for Offset Voltage

and Offset Voltage Drift with Temperature

–

100

Ω*

50k*

15V

–15V

VOUT

VOUT = 1000VOS

*RESISTORS MUST HAVE LOW

THERMOELECTRIC POTENTIAL

1124/25 F01

µV/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.

Offset Voltage and Drift

Thermocouple effects, caused by temperature gradients

across dissimilar metals at the contacts to the input

terminals, 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.

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