Linear Technology LT1079CN Linear IC DIP14 P Prec Quad Op Amp LT1079CN Data Sheet

1

LT1078/LT1079

10789fe

Micropower, Dual and

Quad, Single Supply, Precision Op Amps

■

Available in 8-Pin SO Package

■

50

µ

A Max Supply Current per Amplifier

■

70

µ

V Max Offset Voltage

■

180

µ

A Max Offset Voltage in 8-Pin SO

■

250pA Max Offset Current

■

0.6

µ

V

P-P

, 0.1Hz to 10Hz Voltage Noise

■

3pA

P-P

, 0.1Hz to 10Hz Current Noise

■

0.4

µ

V/

°

C Offset Voltage Drift

■

200kHz Gain Bandwidth Product

■

0.07V/

µ

s Slew Rate

■

Single Supply Operation

Input Voltage Range Includes Ground
Output Swings to Ground while Sinking Current
No Pull-Down Resistors Needed

■

Output Sources and Sinks 5mA Load Current

The LT

®

1078 is a micropower dual op amp in 8-pin

packages including the small outline surface mount pack-
age. The LT1079 is a micropower quad op amp offered in
the standard 14-pin packages. Both devices are optimized
for single supply operation at 5V. 

±

15V specifications are

also provided.

Micropower performance of competing devices is achieved
at the expense of seriously degrading precision, noise,
speed and output drive specifications. The design effort of
the LT1078/LT1079 was concentrated on reducing sup-
ply current without sacrificing other parameters. The
offset voltage achieved is the lowest on any dual or quad
nonchopper stabilized op amp—micropower or other-
wise. Offset current, voltage and current noise, slew rate
and gain bandwidth product are all two to ten times better
than on previous micropower op amps.

The 1/f corner of the voltage noise spectrum is at 0.7Hz,
at least three times lower than on any monolithic op amp.
This results in low frequency (0.1Hz to 10Hz) noise
performance which can only be found on devices with an
order of magnitude higher supply current.

Both the LT1078 and LT1079 can be operated from a
single supply (as low as one lithium cell or two Ni-Cad
batteries). The input range goes below ground. The all-
NPN output stage swings to within a few millivolts of
ground while sinking current—no power consuming pull
down resistors are needed.

■

Battery or Solar-Powered Systems

Portable Instrumentation
Remote Sensor Amplifier
Satellite Circuitry

■

Micropower Sample-and-Hold

■

Thermocouple Amplifier

■

Micropower Filters

INPUT OFFSET VOLTAGE (

µ

V)

–120

PERCENT OF UNITS

0

80

1078/79 • TA02

–80

–40

40

16

14

12

10

8

6

4

2

0

120

V

S

 = 5V, 0V

T

A

 = 25

°

C

–

+

–

+

INVERTING

INPUT

1M

2

3

1

6

5

7

A

1/2 LT1078

10.1k

1M

10.1k

NONINVERTING

INPUT

B

1/2 LT1078

4

8

3V (LITHIUM CELL)

OUT

TYPICAL PERFORMANCE
INPUT OFFSET VOLTAGE = 40

µ

V

INPUT OFFSET CURRENT = 0.2nA
TOTAL POWER DISSIPATION = 240

µ

W

COMMON MODE REJECTION = 110dB (AMPLIFIER LIMITED)
GAIN BANDWIDTH PRODUCT = 200kHz

OUTPUT NOISE  = 85

µ

V

P-P

 0.1Hz TO 10Hz

= 300

µ

V

RMS

 OVER FULL BANDWIDTH

INPUT RANGE  = 0.03V TO 1.8V
OUTPUT RANGE = 0.03V TO 2.3V

  (0.3mV 

≤

 V

IN+

 – V

IN–

 

≤

 23mV)

OUTPUTS SINK CURRENT—NO PULL-DOWN RESISTORS
ARE NEEDED

LT1078/79 • TA01

–

+

, LTC and LT are registered trademarks of Linear Technology Corporation.