LT1079ACN datasheet(12/20 Pages) LINER

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LT1078/LT1079

APPLICATIONS INFORMATION

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 two

and three op amp instrumentation amplifier configura-

tions shown in this data sheet are examples. Matching

characteristics are not 100% tested on the LT1078/LT1079.

Some specifications are guaranteed by definition. For

example, 70

µV maximum offset voltage implies that mis-

match cannot be more than 140

µV. 97dB (= 14µV/V)

CMRR means that worst-case CMRR match is 91dB

(= 28

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

expected matching performance at VS = 5V, 0V between

the two sides of the LT1078, and between amplifiers A and

D, and between amplifiers B and C of the LT1079.

Table 1

LT1078AC/LT1079AC/LT1078AM/LT1079AM

LT1078C/LT1079C/LT1078M/LT1079M

PARAMETER

50% YIELD

98% YIELD

50% YIELD

98% YIELD

UNITS

VOS Match, ∆VOS

LT1078

110

190

µV

LT1079

150

250

µV

Temperature Coefficient

∆VOS

0.5

1.2

0.6

1.8

µV/°C

Average Noninverting IB

Match of Noninverting IB

0.12

0.4

0.15

0.5

CMRR Match

120

100

117

PSRR Match

117

105

117

102

Comparator Applications

The single supply operation of the LT1078/LT1079 and its

ability to swing close to ground while sinking current

lends itself to use as a precision comparator with TTL

compatible output.

VS = 5V, 0V

200

µs/DIV

LT2078/79 • F03

–100

Figure 3. Comparator Rise Response

Time to 10mV, 5mV, 2mV Overdrives

VS = 5V, 0V

200

µs/DIV

LT2078/79 • F04

100

Figure 4. Comparator Fall Response

Time to 10mV, 5mV, 2mV Overdrives

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