FEATURES
s
s
s
s
s
s
s
s
s
s
s
LT1078/LT1079
Micropower, Dual and
Quad, Single Supply, Precision Op Amps
DESCRIPTION
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.
Distribution of Input Offset Voltage
(LT1078 and LT1079 in H, J, N Packages)
16
14
12
PERCENT OF UNITS
7
OUT
s
Available in 8-Pin SO Package
50µA Max Supply Current per Amplifier
70µV Max Offset Voltage
180µA Max Offset Voltage in 8-Pin SO
250pA Max Offset Current
0.6µV
P-P
, 0.1Hz to 10Hz Voltage Noise
3pA
P-P
, 0.1Hz to 10Hz Current Noise
0.4µV/°C Offset Voltage Drift
200kHz Gain Bandwidth Product
0.07V/µs 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
APPLICATIONS
s
s
s
s
Battery or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Satellite Circuitry
Micropower Sample-and-Hold
Thermocouple Amplifier
Micropower Filters
, LTC and LT are registered trademarks of Linear Technology Corporation.
Single Battery, Micropower, Gain = 100, Instrumentation Amplifier
10.1k
1M
1M
3V (LITHIUM CELL)
TYPICAL PERFORMANCE
INPUT OFFSET VOLTAGE = 40µV
INPUT OFFSET CURRENT = 0.2nA
TOTAL POWER DISSIPATION = 240µW
COMMON MODE REJECTION = 110dB (AMPLIFIER LIMITED)
GAIN BANDWIDTH PRODUCT = 200kHz
OUTPUT NOISE = 85
µV
P-P
0.1Hz TO 10Hz
= 300
µV
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
+
INVERTING
INPUT
–
+
3
5
NONINVERTING
INPUT
+
–
–
2
A
1/2 LT1078
1
10.1k
6
8
B
1/2 LT1078
4
LT1078/79 • TA01
U
10
8
6
4
2
U
V
S
= 5V, 0V
T
A
= 25°C
0
–120
–80
–40
40
80
0
INPUT OFFSET VOLTAGE (µV)
120
1078/79 • TA02
1
LINER [ LINEAR TECHNOLOGY ]
