1
LT1078/LT1079
Micropower, Dual and
Quad, Single Supply, Precision Op Amps
FEATURES
s
Available in 8-Pin SO Package
s
50
A Max Supply Current per Amplifier
s
70
V Max Offset Voltage
s
180
A Max Offset Voltage in 8-Pin SO
s
250pA Max Offset Current
s
0.6
V
P-P
, 0.1Hz to 10Hz Voltage Noise
s
3pA
P-P
, 0.1Hz to 10Hz Current Noise
s
0.4
V/
C Offset Voltage Drift
s
200kHz Gain Bandwidth Product
s
0.07V/
s Slew Rate
s
Single Supply Operation
Input Voltage Range Includes Ground
Output Swings to Ground while Sinking Current
No Pull-Down Resistors Needed
s
Output Sources and Sinks 5mA Load Current
DESCRIPTIO
N
U
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.
s
Battery or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Satellite Circuitry
s
Micropower Sample-and-Hold
s
Thermocouple Amplifier
s
Micropower Filters
APPLICATIO
N
S
U
Distribution of Input Offset Voltage
(LT1078 and LT1079 in H, J, N Packages)
INPUT OFFSET VOLTAGE (
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
Single Battery, Micropower, Gain = 100, Instrumentation Amplifier
+
+
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
V
INPUT OFFSET CURRENT = 0.2nA
TOTAL POWER DISSIPATION = 240
W
COMMON MODE REJECTION = 110dB (AMPLIFIER LIMITED)
GAIN BANDWIDTH PRODUCT = 200kHz
OUTPUT NOISE = 85
V
P-P
0.1Hz TO 10Hz
= 300
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.
2
LT1078/LT1079
ABSOLUTE
M
AXI
M
U
M
RATINGS
W
W
W
U
Operating Temperature Range
LT1078AM/LT1078M/
LT1079AM/LT1079M ............................ 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
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 I
N
FOR
M
ATIO
N
W
U
U
ORDER PART
NUMBER
ORDER PART
NUMBER
1
2
3
4
8
7
6
5
TOP VIEW
IN A
OUT A
V
+
OUT B
+IN A
V
+IN B
IN B
S8 PACKAGE
8-LEAD PLASTIC SO
B
A
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
ORDER PART NUMBER
ORDER PART NUMBER
LT1078ACH
LT1078MH
LT1078ACN8
LT1078AMJ8
LT1078CN8
LT1078IN8
LT1078MJ8
LT1078IS8
LT1078S8
ORDER PART NUMBER
PART MARKING
1078
T
JMAX
= 150
C,
JA
= 100
C/ W (J8)
T
JMAX
= 100
C,
JA
= 130
C/ W (N8)
T
JMAX
= 150
C,
JA
= 150
C/ W,
JC
= 45
C/ W
TOP VIEW
OUT B
V
+
OUT A
IN A
IN B
+IN B
+IN A
V
(CASE)
8
7
6
5
3
2
1
4
H PACKAGE
8-LEAD TO-5 METAL CAN
A
B
1
2
3
4
8
7
6
5
TOP VIEW
V
+
OUT B
IN B
+IN B
OUT A
IN A
+IN A
V
N8 PACKAGE
8-LEAD PDIP
J8 PACKAGE
8-LEAD CERAMIC DIP
A
B
LT1079ACN
LT1079CN
LT1079IN
LT1079MJ
TOP VIEW
N PACKAGE
14-LEAD PDIP
J PACKAGE
14-LEAD CERAMIC DIP
1
2
3
4
5
6
7
14
13
12
11
10
9
8
OUT A
IN A
+IN A
V
+
+IN B
IN B
OUT B
OUT D
IN D
+IN D
V
+IN C
IN C
OUT C
A
D
B
C
T
JMAX
= 150
C,
JA
= 100
C/ W (J)
T
JMAX
= 110
C,
JA
= 130
C/ W (N)
LT1079ISW
LT1079SW
T
JMAX
= 110
C,
JA
= 220
C/ W
1
2
3
4
5
6
7
8
TOP VIEW
SW PACKAGE
16-LEAD PLASTIC SO WIDE
16
15
14
13
12
11
10
9
OUT A
IN A
+IN A
V
+
+IN B
IN B
OUT B
NC
OUT D
IN D
+IN D
V
+IN C
IN C
OUT C
NC
A
D
B
C
NOTE: FOR 14-PIN NARROW
PACKAGE SEE THE LT2079
T
JMAX
= 110
C,
JA
= 150
C/ W
3
LT1078/LT1079
ELECTRICAL CHARACTERISTICS
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, T
A
= 25
C, unless otherwise noted.
LT1078C/LT1079C
LT1078I/LT1079I
LT1078AC/LT1079AC
LT1078M/LT1079M
LT1078AM/LT1079AM
LT1078S8/LT1079SW
SYMBOL
PARAMETER
CONDITIONS (NOTE 1)
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT1078
30
70
40
120
V
LT1078IS8/LT1078S8
60
180
V
LT1079
35
100
40
150
V
LT1079ISW/LT1079SW
60
300
V
V
OS
Long Term Input Offset
0.4
0.5
V/Mo
Time
Voltage Stability
I
OS
Input Offset Current
0.05
0.25
0.05
0.35
nA
I
B
Input Bias Current
6
8
6
10
nA
e
n
Input Noise Voltage
0.1Hz to 10Hz (Note 2)
0.6
1.2
0.6
V
P-P
Input Noise Voltage Density
f
O
= 10Hz (Note 2)
29
45
29
nV
Hz
f
O
= 1000Hz (Note 2)
28
37
28
nV
Hz
i
n
Input Noise Current
0.1Hz to 10Hz (Note 2)
2.3
4.0
2.3
pA
P-P
Input Noise Current Density
f
O
= 10Hz (Note 2)
0.06
0.10
0.06
pA
Hz
f
O
= 1000Hz
0.02
0.02
pA
Hz
Input Resistance
(Note 3)
Differential Mode
400
800
300
800
M
Common Mode
6
6
G
Input Voltage Range
3.5
3.8
3.5
3.8
V
0
0.3
0
0.3
V
CMRR
Common Mode Rejection Ratio
V
CM
= 0V to 3.5V
97
110
94
108
dB
PSRR
Power Supply Rejection Ratio
V
S
= 2.3V to 12V
102
114
100
114
dB
A
VOL
Large-Signal Voltage Gain
V
O
= 0.03V to 4V, No Load
200
1000
150
1000
V/mV
V
O
= 0.03V to 3.5V, R
L
= 50k
150
600
120
600
V/mV
Maximum Output Voltage
Output Low, No Load
3.5
6
3.5
6
mV
Swing
Output Low, 2k to GND
0.55
1.0
0.55
1.0
mV
Output Low, I
SINK
= 100
A
95
130
95
130
mV
Output High, No Load
4.2
4.4
4.2
4.4
V
Output High, 2k to GND
3.5
3.9
3.5
3.9
V
SR
Slew Rate
A
V
= 1, V
S
=
2.5V
0.04
0.07
0.04
0.07
V/
s
GBW
Gain Bandwidth Product
f
O
20kHz
200
200
kHz
I
S
Supply Current per Amplifier
38
50
39
55
A
Channel Separation
V
IN
= 3V, R
L
= 10k
130
130
dB
Minimum Supply Voltage
(Note 4)
2.2
2.3
2.2
2.3
V
4
LT1078/LT1079
ELECTRICAL CHARACTERISTICS
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, 40
C
T
A
85
C for I grades, 55
C
T
A
125
C for AM/M grades, unless otherwise noted.
LT1078I/LT1079I
LT1078AM/LT1079AM
LT1078M/LT1079M
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT1078
q
70
250
95
370
V
LT1078IS8/LT1079
q
80
280
100
400
V
LT1079ISW
q
100
560
V
V
OS
Input Offset Voltage Drift
q
0.4
1.8
0.5
2.5
V/
C
T
(Note 5)
LT1078IS8
q
0.6
3.5
V/
C
LT1079ISW
q
0.7
4.0
V/
C
I
OS
Input Offset Current
q
0.07
0.50
0.07
0.70
nA
LT1078I/LT1079I
q
0.1
1.0
nA
I
B
Input Bias Current
q
7
10
7
12
nA
CMRR
Common Mode Rejection Ratio
V
CM
= 0.05V to 3.2V
q
92
106
88
104
dB
PSRR
Power Supply Rejection Ratio
V
S
= 3.1V to 12V
q
98
110
94
110
dB
A
VOL
Large-Signal Voltage Gain
V
O
= 0.05V to 4V, No Load
q
110
600
80
600
V/mV
V
O
= 0.05V to 3.5V, R
L
= 50k
q
80
400
60
400
V/mV
Maximum Output Voltage
Output Low, No Load
q
4.5
8
4.5
8
mV
Swing
Output Low, I
SINK
= 100
A
q
125
170
125
170
mV
Output High, No Load
q
3.9
4.2
3.9
4.2
V
Output High, 2k to GND
q
3.0
3.7
3.0
3.7
V
I
S
Supply Current per Amplifier
q
43
60
45
70
A
LT1078C/LT1079C
LT1078AC/LT1079AC
LT1078S8/LT1079SW
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT1078
q
50
150
60
240
V
LT1079
q
60
180
70
270
V
LT1078S8
q
85
350
V
LT1079SW
q
90
480
V
V
OS
Input Offset Voltage Drift
q
0.4
1.8
0.5
2.5
V/
C
T
(Note 5)
LT1078S8
q
0.6
3.5
V/
C
LT1079SW
q
0.7
4.0
V/
C
I
OS
Input Offset Current
q
0.06
0.35
0.06
0.50
nA
I
B
Input Bias Current
q
6
9
6
11
nA
CMRR
Common Mode Rejection Ratio
V
CM
= 0V to 3.4V
q
94
108
90
106
dB
PSRR
Power Supply Rejection Ratio
V
S
= 2.6V to 12V
q
100
112
97
112
dB
A
VOL
Large-Signal Voltage Gain
V
O
= 0.05V to 4V, No Load
q
150
750
110
750
V/mV
V
O
= 0.05V to 3.5V, R
L
= 50k
q
110
500
80
500
V/mV
Maximum Output Voltage
Output Low, No Load
q
4.0
7
4.0
7
mV
Swing
Output Low, I
SINK
= 100
A
q
105
150
105
150
mV
Output High, No Load
q
4.1
4.3
4.1
4.3
V
Output High, 2k to GND
q
3.3
3.8
3.3
3.8
V
I
S
Supply Current per Amplifier
q
40
55
42
63
A
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, 0
C
T
A
70
C, unless otherwise noted.
5
LT1078/LT1079
ELECTRICAL CHARACTERISTICS
V
S
=
15V, T
A
= 25
C, unless otherwise noted.
LT1078C/LT1079C
LT1078I/LT1079I
LT1078AC/LT1079AC
LT1078M/LT1079M
LT1078AM/LT1079AM
LT1078S8/LT1079SW
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
(Including LT1078IS8/LT1078S8)
50
250
70
350
V
LT1079ISW/LT1079SW
80
500
V
I
OS
Input Offset Current
0.05
0.25
0.05
0.35
nA
I
B
Input Bias Current
6
8
6
10
nA
Input Voltage Range
13.5
13.8
13.5
13.8
V
15.0
15.3
15.0
15.3
V
CMRR
Common Mode Rejection Ratio
V
CM
= 13.5V, 15V
100
114
97
114
dB
PSRR
Power Supply Rejection Ratio
V
S
= 5V, 0V to
18V
102
114
100
114
dB
A
VOL
Large-Signal Voltage Gain
V
O
=
10V, R
L
= 50k
1000
5000
1000
5000
V/mV
V
O
=
10V, R
L
= 2k
400
1100
300
1100
V/mV
V
OUT
Maximum Output Voltage
R
L
= 50k
13.0
14.0
13.0
14.0
V
Swing
R
L
= 2k
11.0
13.2
11.0
13.2
V
SR
Slew Rate
0.06
0.10
0.06
0.10
V/
s
I
S
Supply Current per Amplifier
46
65
47
75
A
V
S
=
15V, 40
C
T
A
85
C for I grades, 55
C
T
A
125
C for AM/M grades unless otherwise noted.
LT1078I/LT1079I
LT1078AM/LT1079AM
LT1078M/LT1079M
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
(Including LT1078IS8)
q
90
430
120
600
V
LT1079ISW
q
130
825
V
V
OS
Input Offset Voltage Drift
q
0.5
1.8
0.6
2.5
V/
C
T
(Note 5)
LT1078IS8
q
0.7
3.8
V/
C
LT1079ISW
q
0.8
5.0
V/
C
I
OS
Input Offset Current
q
0.07
0.50
0.07
0.70
nA
LT1078I/LT1079I
q
0.1
1.0
nA
I
B
Input Bias Current
q
7
10
7
12
nA
A
VOL
Large-Signal Voltage Gain
V
O
=
10V, R
L
= 5k
q
200
700
150
700
V/mV
CMRR
Common Mode Rejection Ratio
V
CM
= 13V, 14.9V
q
94
110
90
110
dB
PSRR
Power Supply Rejection Ratio
V
S
= 5V, 0V to
18V
q
98
110
94
110
dB
Maximum Output Voltage Swing R
L
= 5k
q
11.0
13.5
11.0
13.5
V
I
S
Supply Current per Amplifier
q
52
80
54
95
A
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