FEATURES
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LT1078/LT1079
Micropower, Dual and
Quad, Single Supply, Precision Op Amps
DESCRIPTIO
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
PERCENT OF UNITS
V
S
= 5V, 0V
T
A
= 25°C
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
APPLICATIO S
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.
TYPICAL APPLICATIO
10.1k
1M
Single Battery, Micropower, Gain = 100, Instrumentation Amplifier
1M
3V (LITHIUM CELL)
NONINVERTING
INPUT
+
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 = 85µV
P-P
0.1Hz TO 10Hz
= 300µV
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
–
–
2
A
1/2 LT1078
1
10.1k
6
8
7
OUT
B
1/2 LT1078
4
LT1078/79 • TA01
U
U
U
12
10
8
6
4
2
0
–120
–80
40
80
0
INPUT OFFSET VOLTAGE (µV)
–40
120
1078/79 • TA02
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1
LT1078/LT1079
ABSOLUTE
MAXIMUM
RATINGS
Supply Voltage ......................................................
±22V
Differential Input Voltage .......................................
±30V
Input Voltage ............... Equal to Positive Supply Voltage
............5V Below Negative Supply Voltage
Output Short-Circuit Duration .......................... Indefinite
Storage Temperature Range
All Grades ......................................... – 65°C to 150°C
PACKAGE/ORDER INFORMATION
TOP VIEW
V
+
8
OUT A 1
A
–IN A 2
+IN A 3
B
6 –IN B
5 +IN B
4
–
(CASE)
OUT A 1
7 OUT B
–IN A 2
+IN A 3
V
–
4
V
H PACKAGE
8-LEAD TO-5 METAL CAN
N8 PACKAGE
8-LEAD PDIP
T
JMAX
= 100°C,
θ
JA
= 130°C/ W (N8)
T
JMAX
= 150°C,
θ
JA
= 150°C/ W,
θ
JC
= 45°C/ W
ORDER PART NUMBER
LT1078ACN8
LT1078CN8
LT1078IN8
J8 PACKAGE
8-LEAD PDIP
T
JMAX
= 150°C,
θ
JA
= 100°C/ W (J8)
ORDER PART NUMBER
LT1078ACH
LT1078MH
OBSOLETE PACKAGES
Consider the N8 and S8 Packages for Alternate Source
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V
+
4
+IN B 5
–IN B 6
OUT B 7
B
C
A
D
14 OUT D
13 –IN D
12 +IN D
11 V
–
10 +IN C
9
8
–IN C
OUT C
LT1078AMJ8
LT1078MJ8
ORDER PART
NUMBER
LT1079ACN
LT1079CN
LT1079IN
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V
+
4
+IN B 5
–IN B 6
OUT B 7
NC 8
B
C
A
D
16 OUT D
15 –IN D
14 +IN D
13 V–
12 +IN C
11 –IN C
10 OUT C
9
NC
N PACKAGE
14-LEAD PDIP
T
JMAX
= 110°C,
θ
JA
= 130°C/ W (N)
J PACKAGE
14-LEAD CERAMIC DIP
T
JMAX
= 150°C,
θ
JA
= 100°C/ W (J)
LT1079MJ
OBSOLETE PACKAGE
Consider the N Packages for Alternate Source
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2
U
U
W
W W
U
W
(Note 1)
Operating Temperature Range
LT1078AM/LT1078M/
LT1079AM/LT1079M
(OBSOLETE) .....
– 55°C to 125°C
LT1078I/LT1079I .................................... – 40°C to 85°C
LT1078AC/LT1078C/LT1078S8/
LT1079AC/LT1079C .................................... 0°C to 70°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
8
A
B
7
6
5
V
+
OUT B
–IN B
+IN B
+IN A 1
V
–
2
+IN B 3
–IN B 4
TOP VIEW
8
A
7
6
B
5
–IN A
OUT A
V
+
OUT B
S8 PACKAGE
8-LEAD PLASTIC SO
NOTE: THIS PIN CONFIGURATION DIFFERS FROM THE
8-LEAD DIP PIN LOCATIONS. INSTEAD, IT FOLLOWS
THE INDUSTRY STANDARD LT1013DS8 SO PACKAGE
CONFIGURATION. FOR SIMILAR PERFORMANCE WITH
TRADITIONAL DIP PINOUT, SEE THE LT2078
T
JMAX
= 110°C,
θ
JA
= 220°C/ W
ORDER PART NUMBER
LT1078IS8
LT1078S8
PART MARKING
1078
ORDER PART
NUMBER
LT1079ISW
LT1079SW
SW PACKAGE
16-LEAD PLASTIC SO WIDE
NOTE: FOR 14-PIN NARROW
PACKAGE SEE THE LT2079
T
JMAX
= 110°C,
θ
JA
= 150°C/ W
LT1078/LT1079
The
q
denotes the specifications which apply over the temperature range
– 40°C
≤
T
A
≤
85°C for I grades, – 55°C
≤
T
A
≤
125°C for AM/M grades. V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V unless otherwise noted.
LT1078I/LT1079I
LT1078AM/LT1079AM
LT1078M/LT1079M
MIN
TYP
MAX MIN
TYP
MAX
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
OS
∆V
OS
∆T
I
OS
I
B
CMRR
PSRR
A
VOL
Input Offset Voltage
CONDITIONS
UNITS
µV
µV
µV
µV/°C
µV/°C
µV/°C
nA
nA
nA
dB
dB
V/mV
V/mV
LT1078
LT1078IS8/LT1079
LT1079ISW
LT1078IS8
LT1079ISW
LT1078I/LT1079I
70
80
0.4
250
280
1.8
95
100
100
0.5
0.6
0.7
0.07
0.1
7
88
94
80
60
104
110
600
400
4.5
125
3.9
3.0
4.2
3.7
45
370
400
560
2.5
3.5
4.0
0.70
1.0
12
Input Offset Voltage Drift
(Note 6)
Input Offset Current
Input Bias Current
0.07
7
92
98
110
80
106
110
600
400
4.5
125
3.9
3.0
4.2
3.7
43
0.50
10
Common Mode Rejection Ratio V
CM
= 0.05V to 3.2V
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage
Swing
V
S
= 3.1V to 12V
V
O
= 0.05V to 4V, No Load
V
O
= 0.05V to 3.5V, R
L
= 50k
Output Low, No Load
Output Low, I
SINK
= 100µA
Output High, No Load
Output High, 2k to GND
8
170
8
170
mV
mV
V
V
I
S
Supply Current per Amplifier
60
70
µA
The
q
denotes the specifications which apply over the temperature range 0°C
≤
T
A
≤
70°C. V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V
unless otherwise noted.
LT1078C/LT1079C
LT1078AC/LT1079AC
LT1078S8/LT1079SW
MIN
TYP
MAX MIN
TYP
MAX
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
SYMBOL PARAMETER
V
OS
Input Offset Voltage
CONDITIONS
LT1078
LT1079
LT1078S8
LT1079SW
LT1078S8
LT1079SW
UNITS
µV
µV
µV
µV
µV/°C
µV/°C
µV/°C
nA
nA
dB
dB
V/mV
V/mV
50
60
150
180
60
70
85
90
0.5
0.6
0.7
0.06
6
90
97
110
80
106
112
750
500
4.0
105
4.1
3.3
4.3
3.8
42
240
270
350
480
2.5
3.5
4.0
0.50
11
∆V
OS
∆T
I
OS
I
B
CMRR
PSRR
A
VOL
Input Offset Voltage Drift
(Note 6)
Input Offset Current
Input Bias Current
0.4
1.8
0.06
6
94
100
150
110
108
112
750
500
4.0
105
4.1
3.3
4.3
3.8
40
0.35
9
Common Mode Rejection Ratio V
CM
= 0V to 3.4V
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage
Swing
V
S
= 2.6V to 12V
V
O
= 0.05V to 4V, No Load
V
O
= 0.05V to 3.5V, R
L
= 50k
Output Low, No Load
Output Low, I
SINK
= 100µA
Output High, No Load
Output High, 2k to GND
7
150
7
150
mV
mV
V
V
I
S
Supply Current per Amplifier
55
63
µA
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LT1078/LT1079
ELECTRICAL CHARACTERISTICS
V
S
=
±15V,
T
A
= 25°C unless otherwise noted.
LT1078C/LT1079C
LT1078I/LT1079I
LT1078M/LT1079M
LT1078S8/LT1079SW
MIN
TYP
MAX
70
80
0.05
6
13.5
–15.0
97
100
1000
300
±13.0
±11.0
0.06
65
13.8
–15.3
114
114
5000
1100
±14.0
±13.2
0.10
47
75
350
500
0.35
10
SYMBOL PARAMETER
V
OS
I
OS
I
B
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Voltage Range
CMRR
PSRR
A
VOL
V
OUT
SR
I
S
CONDITIONS
(Including LT1078IS8/LT1078S8)
LT1079ISW/LT1079SW
LT1078AC/LT1079AC
LT1078AM/LT1079AM
MIN
TYP
MAX
50
0.05
6
13.5
–15.0
100
102
1000
400
±13.0
±11.0
0.06
13.8
–15.3
114
114
5000
1100
±14.0
±13.2
0.10
46
250
0.25
8
UNITS
µV
µV
nA
nA
V
V
dB
dB
V/mV
V/mV
V
V
V/µs
µA
Common Mode Rejection Ratio V
CM
= 13.5V, –15V
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage
Swing
Slew Rate
Supply Current per Amplifier
V
S
= 5V, 0V to
±18V
V
O
=
±10V,
R
L
= 50k
V
O
=
±10V,
R
L
= 2k
R
L
= 50k
R
L
= 2k
The
q
denotes the specifications which apply over the temperature range – 40°C
≤
T
A
≤
85°C for I grades, – 55°C
≤
T
A
≤
125°C for
AM/M grades. V
S
=
±15V
unless otherwise noted.
LT1078I/LT1079I
LT1078AM/LT1079AM
LT1078M/LT1079M
MIN
TYP
MAX MIN
TYP
MAX
q
q
q
q
q
q
q
q
SYMBOL PARAMETER
V
OS
∆V
OS
∆T
I
OS
I
B
A
VOL
CMRR
PSRR
Input Offset Voltage
Input Offset Voltage Drift
(Note 6)
Input Offset Current
CONDITIONS
(Including LT1078IS8)
LT1079ISW
LT1078IS8
LT1079ISW
LT1078I/LT1079I
UNITS
µV
µV
µV/°C
µV/°C
µV/°C
nA
nA
nA
V/mV
dB
dB
V
µA
90
0.5
430
1.8
120
130
0.6
0.7
0.8
0.07
0.1
7
150
90
94
±11.0
700
110
110
±13.5
54
600
825
2.5
3.8
5.0
0.70
1.0
12
0.07
7
200
94
98
±11.0
700
110
110
±13.5
52
0.50
10
Input Bias Current
Large-Signal Voltage Gain
V
O
=
±10V,
R
L
= 5k
V
S
= 5V, 0V to
±18V
q
q
q
q
q
Common Mode Rejection Ratio V
CM
= 13V, –14.9V
Power Supply Rejection Ratio
Maximum Output Voltage Swing R
L
= 5k
I
S
Supply Current per Amplifier
80
95
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