Datasheet

10
LT1078/LT1079
10789fe
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Small-Signal Transient Response
V
S
= ± 2.5V
20mV/DIV
A
V
= 1 10μs/DIV
C
L
= 15pF
LT1078/79 • TPC25
0V
Small-Signal Transient Response
V
S
= 5V, 0V
20mV/DIV
A
V
= 1 10μs/DIV
C
L
= 15pF
INPUT 50mV TO 150mV
LT1078/79 • TPC24
0.1V
Small-Signal Transient Response
V
S
= ± 15V
20mV/DIV
A
V
= 1 10μs/DIV
C
L
= 15pF
LT1078/79 • TPC26
0V
APPLICATIONS INFORMATION
WUU
U
The LT1078/LT1079 devices are fully specified with
V
+
= 5V, V
–
= 0V, V
CM
= 0.1V. This set of operating
conditions appears to be the most representative for
battery-powered micropower circuits. Offset voltage is
internally trimmed to a minimum value at these supply
voltages. When 9V or 3V batteries or ±2.5V dual supplies
are used, bias and offset current changes will be minimal.
Offset voltage changes will be just a few microvolts as
given by the PSRR and CMRR specifications. For example,
if PSRR = 114dB (= 2μV/V), at 9V the offset voltage change
will be 8μV. Similarly, V
S
= ±2.5V, V
CM
= 0V is equivalent
to a common mode voltage change of 2.4V or a V
OS
change of 7μV if CMRR = 110dB (3μV/V).
A full set of specifications is also provided at ±15V supply
voltages for comparison with other devices and for com-
pleteness.
Single Supply Operation
The LT1078/LT1079 are fully specified for single supply
operation, i.e., when the negative supply is 0V. Input
common mode range goes below ground and the output
swings within a few millivolts of ground while sinking
current. All competing micropower op amps either cannot
swing to within 600mV of ground (OP-20, OP-220, OP-420)
or need a pull-down resistor connected to the output to swing
to ground (OP-90, OP-290, OP-490, HA5141/42/44). This