LT1078_15 Datasheet, PDF (12/20 Pages) Linear Technology – Micropower, Dual and Quad, Single Supply, Precision Op Amps

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, 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 V_S = 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
PARAMETER
V_OS Match, ΔV_OS
LT1078
LT1079
Temperature Coefficient ΔV_OS
Average Noninverting I_B
Match of Noninverting I_B
CMRR Match
PSRR Match
LT1078AC/LT1079AC/LT1078AM/LT1079AM
50% YIELD
98% YIELD
30
110
40
150
0.5
1.2
6
8
0.12
0.4
120
100
117
105
LT1078C/LT1079C/LT1078M/LT1079M
50% YIELD
98% YIELD
50
190
50
250
0.6
1.8
6
10
0.15
0.5
117
97
117
102
UNITS
μV
μV
μV/°C
nA
nA
dB
dB
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
0
0
–100
V_S = 5V, 0V
200μs/DIV
LT2078/79 • F03
Figure 3. Comparator Rise Response
Time to 10mV, 5mV, 2mV Overdrives
4
2
0
100
0
V_S = 5V, 0V
200μs/DIV
LT2078/79 • F04
Figure 4. Comparator Fall Response
Time to 10mV, 5mV, 2mV Overdrives
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