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LT1078/LT1079

TYPICAL PERFORMANCE CHARACTERISTICS

Small-Signal Transient Response

VS = ± 2.5V

AV = 1

µs/DIV

CL = 15pF

LT1078/79 • TPC25

Small-Signal Transient Response

VS = 5V, 0V

AV = 1

µs/DIV

CL = 15pF

INPUT 50mV TO 150mV

LT1078/79 • TPC24

0.1V

Small-Signal Transient Response

VS = ± 15V

AV = 1

µs/DIV

CL = 15pF

LT1078/79 • TPC26

APPLICATIONS INFORMATION

The LT1078/LT1079 devices are fully specified with

V + = 5V, V – = 0V, VCM = 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 (= 2

µV/V), at 9V the offset voltage change

will be 8

µV. Similarly, VS = ±2.5V, VCM = 0V is equivalent

to a common mode voltage change of 2.4V or a VOS

change of 7

µV 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

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