LT1078/LT1079
U
W U U
APPLICATIONS INFORMATION
Matching Specifications
Some specifications are guaranteed by definition. For
example, 70µV maximum offset voltage implies that mis-
match cannot be more than 140µV. 97dB (= 14µV/V)
CMRR means that worst-case CMRR match is 91dB
(= 28µV/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.
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
characteristicsarenot100%testedontheLT1078/LT1079.
Table 1
LT1078AC/LT1079AC/LT1078AM/LT1079AM
LT1078C/LT1079C/LT1078M/LT1079M
PARAMETER
Match, ∆V
50% YIELD
98% YIELD
50% YIELD
98% YIELD
190
UNITS
µV
µV
µV/°C
nA
V
OS
LT1078
LT1079
30
40
0.5
6
110
150
1.2
8
50
50
0.6
6
OS
250
1.8
10
Temperature Coefficient ∆V
Average Noninverting I
OS
B
Match of Noninverting I
CMRR Match
PSRR Match
0.12
120
117
0.4
100
105
0.15
117
117
0.5
97
102
nA
dB
dB
B
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.
4
2
4
2
0
0
0
100
–100
0
VS = 5V, 0V
200µs/DIV
VS = 5V, 0V
200µs/DIV
LT2078/79 • F03
LT2078/79 • F04
Figure 4. Comparator Fall Response
Time to 10mV, 5mV, 2mV Overdrives
Figure 3. Comparator Rise Response
Time to 10mV, 5mV, 2mV Overdrives
12
Linear [ Linear ]
