LT1178/LT1179
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The LT
1178 is a micropower dual op amp in the standard
8-pin configuration; the LT1179 is a micropower quad op
amp offered in the standard 14-pin packages. Both
devices are optimized for single supply operation at 5V.
Specifications are also provided at 15V supplies.
The extremely low supply current is combined with true
precision specifications: offset voltage is 30V, offset
current is 50pA. Both offset parameters have low drift with
temperature. The 1.5pAp-p current noise and picoampere
offset current permit the use of megaohm level source
resistors without introducing serious errors. Voltage noise,
at 0.9Vp-p, is remarkably low considering the low
supply current.
Both the LT1178 and LT1179 can be operated from a
single supply (as low as one lithium cell or two NiCd
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.
For applications where three times higher supply
current is acceptable, the micropower LT1077 single,
LT1078 dual and LT1079 quad are recommended. The
LT1077/78/79 have significantly higher bandwidth, slew
rate, lower voltage noise and better output drive capability.
17A Max Supply Current per Amplifier
70V Max Offset Voltage
250pA Max Offset Current
5nA Max Input Bias Current
0.9V
P-P
0.1Hz to 10Hz Voltage Noise
1.5pA
P-P
0.1Hz to 10Hz Current Noise
0.5V/C Offset Voltage Drift
85kHz Gain-Bandwidth Product
0.04V/s Slew Rate
Single Supply Operation:
Input Voltage Range Includes Ground
Output Swings to Ground While Sinking Current
No Pull Down Resistors are Needed
Output Sources and Sinks 5mA Load Current
17A Max, Dual and Quad,
Single Supply, Precision Op Amps
Self-Buffered, Dual Output, Micropower Reference
Supply Current vs Temperature
Battery or Solar Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Satellite Circuitry
Micropower Sample-and-Hold
Thermocouple Amplifier
Micropower Filters
TEMPERATURE (C)
50
10
SUPPLY CURRENT PER AMPLIFIER (
A)
12
14
16
25
0
25
50
LT1178/LT1179 TA02
75
18
20
100
V
S
= 15V
V
S
= 5V, 0V
V
S
= 1.5V
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
+
+
2
2M
1M*
1M*
1
250k*
0.1F
0.1F
LT1004-1.2
1/2 LT1178
1/2 LT1178
4
6
5
8
4V TO 9V
1.2365V
OUTPUT
2.470V
OUTPUT
TOTAL BATTERY CURRENT
OUTPUT ACCURACY
TEMPERATURE COEFFICIENT
LOAD REGULATION
LINE REGULATION
*
= 28A
= 0.4% MAX
= 20ppm/C
= 25ppm/mA, I
L
5mA, V
+
5V
= 10ppm/V
= 0.1% FILM RESISTORS
7
3
LT1178/LT1179 TA01
, LTC and LT are registered trademarks of Linear Technology Corporation.
LT1178/LT1179
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Supply Voltage ...................................................... 22V
Differential Input Voltage ....................................... 30V
Input Voltage ............... Equal to Positive Supply Voltage
Input Voltage ............ 5V Below Negative Supply Voltage
Output Short-Circuit Duration .......................... Indefinite
Consult LTC Marketing for parts specified with wider operating temperature ranges. Please note that the LT1178S8 surface mount pinout differs from that
of the LT1178 standard plastic or ceramic dual-in-line packages. For similiar performance with standard pinout, see the LT2178.
(Note 1)
ABSOLUTE AXI U RATI GS
W
W
W
U
PACKAGE/ORDER I FOR ATIO
U
U
W
Operating Temperature Range
LT1178I/LT1179I .................................. 40C to 85C
LT1178C/LT1178S/LT1179C/LT1179S ....... 0C to 70C
Storage Temperature Range ................ 65C to 150C
Lead Temperature (Soldering, 10 sec.)................. 300C
LT1178ACH
LT1178CH
ORDER PART
NUMBER
LT1178ACN8
LT1178CN8
LT1178IN8
LT1178ACJ8
LT1178CJ8
LT1179ACN
LT1179CN
LT1179IN
LT1179ACJ
LT1179CJ
LT11778/1179 POI01
1
2
3
4
5
6
7
8
TOP VIEW
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
ORDER PART
NUMBER
LT1178SW
LT1179SW
ORDER PART
NUMBER
ORDER PART
NUMBER
ORDER PART
NUMBER
TOP VIEW
OUT B
V+
OUT A
IN A
IN B
IN A
+ IN B
V (CASE)
8
7
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
OUT A
IN A
+IN A
V
V +
OUT B
IN B
+IN B
N PACKAGE
8-LEAD PDIP
B
-
+
A
-
+
1
2
3
4
5
6
7
TOP VIEW
J PACKAGE 14-LEAD CERAMIC DIP
N PACKAGE
14-LEAD PDIP
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
D
-
+
A
-
+
C
+
-
B
+
-
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150
C,
JA
= 200
C/W
PART
MARKING
LT1178S8
1178
J PACKAGE 8-LEAD CERDIP
OBSOLETE PACKAGE
Consider the N8 or S8 Package for Alternate Source
OBSOLETE PACKAGE
Consider the N14 Package for Alternate Source
SW PACKAGE
16-LEAD PLASTIC SO WIDE
1
2
3
4
8
7
6
5
TOP VIEW
IN A
OUT A
V
+
OUT B
+IN A
V
+IN B
IN B
SW PACKAGE
16-LEAD PLASTIC SO WIDE
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
NC
NC
OUT A
IN A
+IN A
V
NC
NC
NC
NC
V +
OUT B
IN B
+IN B
NC
NC
LT1178
LT1179
T
JMAX
= 100
C,
JA
= 150
C/W
T
JMAX
= 150
C,
JA
= 90
C/W
T
JMAX
= 150
C,
JA
= 90
C/W
T
JMAX
= 110
C,
JA
= 130
C/W
Not Recommended. Use LT1178S8 for
New Designs.
A
-
+
B
-
+
ELECTRICAL CHARACTERISTICS
V
S
= 5V, 0V; V
CM
= 0.1V, V
O
= 1.4V, T
A
= 25C, unless noted.
LT1178AC/LT1179AC LT1178I/C/S/LT1179I/C/S
SYMBOL
PARAMETER
CONDITIONS (NOTE 2)
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT1178
30
70
40
120
V
LT1179
35
100
40
150
V
LT1178SW
80
450
V
LT1179SW
90
600
V
LT1178S8
60
180
V
V
OS
Long Term Input Offset
0.5
0.6
V/Mo
Time
Voltage Stability
I
OS
Input Offset Current
0.05
0.25
0.05
0.35
nA
LT1178/LT1179
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V
S
= 5V, 0V; V
CM
= 0.1V, V
O
= 1.4V, T
A
= 25C, unless noted.
ELECTRICAL CHARACTERISTICS
LT1178AC/LT1179AC LT1178I/C/S/LT1179I/C/S
SYMBOL
PARAMETER
CONDITIONS (NOTE 2)
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
I
B
Input Bias Current
3
5
3
6
nA
e
n
Input Noise Voltage
0.1Hz to 10Hz (Note 3)
0.9
2.0
0.9
V
P-P
Input Noise Voltage Density
f
O
= 10Hz (Note 3)
50
75
50
nV/Hz
f
O
= 1000Hz (Note 3)
49
65
49
nV/Hz
i
n
Input Noise Current
0.1Hz to 10Hz (Note 3)
1.5
2.5
1.5
pAp-p
Input Noise Current Density
f
O
= 10Hz (Note 3)
0.03
0.07
0.03
pA/Hz
f
O
= 1000Hz
0.01
0.01
pA/Hz
Input Resistance
(Note 4)
Differential Mode
0.8
2.0
0.6
2.0
G
Common Mode
12
12
G
Input Voltage Range
3.5
3.9
3.5
3.9
V
0
0.3
0
0.3
V
CMRR
Common Mode Rejection Ratio V
CM
= 0V to 3.5V
93
103
90
102
dB
PSRR
Power Supply Rejection Ratio
V
S
= 2.2V to 12V
94
104
92
104
dB
A
VOL
Large Signal Voltage Gain
V
O
= 0.03V to 4V, No Load
140
700
110
700
V/mV
(Note 4)
V
O
= 0.03V to 3.5V, R
L
= 50k
80
200
70
200
V/mV
Maximum Output Voltage
Output Low, No Load
6.5
9
6.5
9
mV
Swing
Output Low, 2k to GND
0.2
0.6
0.2
0.6
mV
Output Low, I
SINK
= 100A
120
160
120
160
mV
Output High, No Load
4.2
4.4
4.2
4.4
V
Output High 2k to GND
3.5
3.8
3.5
3.8
V
SR
Slew Rate
A
V
= 1, C
L
= 10pF (Note 4)
0.013
0.025
0.013
0.025
V/s
GBW
Gain Bandwidth Product
f
O
5kHz
60
60
kHz
I
S
Supply Current
13
18
14
21
A
per Amplifier
V
S
= 1.5V, V
O
= 0V
12
17
13
20
A
Channel Separation
V
IN
= 3V, R
L
= 10k
130
130
dB
Minimum Supply Voltage
(Note 5)
2.0
2.2
2.0
2.2
V
LT1178/LT1179
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ELECTRICAL CHARACTERISTICS
LT1178I/LT1179I
LT1178SW/LT1179SW
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
lnput Offset Voltage
LT1178
80
315
120
650
V
LT1179
80
345
130
800
V
V
OS
/T
Input Offset Voltage Drift
(Note 6)
0.6
3.0
0.8
4.5
V/C
I
OS
Input Offset Current
0.07
0.7
0.06
0.50
nA
I
B
Input Bias Current
4
8
3
7
nA
CMRR
Common Mode Rejection
V
CM
= 0.05V to 3.2V I grade
84
98
86
100
dB
Ratio
V
CM
= 0V to 3.4V S grade
PSRR
Power Supply Rejection
V
S
= 3.0V to 12V I grade
86
100
88
102
dB
Ratio
V
S
= 2.5V to 12V S grade
A
VOL
Large-Signal Voltage Gain
V
O
= 0.05V to 4V, No Load (Note 4)
55
350
80
500
V/mV
V
O
= 0.05V to 3.5V, R
L
= 50k
35
130
45
160
V/mV
Maximum Output Voltage
Output Low, No Load
9
13
8
11
mV
Swing
Output Low, I
SINK
= 100A
160
220
140
190
mV
Output High, No Load
3.9
4.2
4.1
4.3
V
Output High, 2k to GND
3.0
3.7
3.3
3.8
V
I
S
Supply Current per Amplifier
15
27
15
24
A
The
denotes specifications which apply over the full operating
temperature range of 40C T
A
85C for I grades, 0C T
A
70C for SW grades, V
S
= 5V, 0V; V
CM
= 0.1V, V
O
= 1.4V, unless
noted. (Note 7)
LT1178AC/LT1179AC
LT1178C/S8/LT1179C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
lnput Offset Voltage
LT1178
50
170
65
250
V
LT1178S8
85
350
V
LT1179
60
200
70
290
V
V
OS
/T
Input Offset Voltage Drift
(Note 6)
0.5
2.2
0.6
3.0
V/C
LT1178S8
0.6
3.5
V/C
I
OS
Input Offset Current
0.06
0.35
0.06
0.50
nA
I
B
Input Bias Current
3
6
3
7
nA
CMRR
Common Mode Rejection Ratio
V
CM
= 0V to 3.4V
90
101
86
100
dB
PSRR
Power Supply Rejection Ratio
V
S
= 2.5V to 12V
90
102
88
102
dB
A
VOL
Large-Signal Voltage Gain
V
O
= 0.05V to 4V, No Load (Note 4)
105
500
80
500
V/mV
V
O
= 0.05V to 3.5V, R
L
= 50k
55
160
45
160
V/mV
Maximum Output Voltage
Output Low, No Load
8
11
8
11
mV
Swing
Output Low, I
SINK
= 100A
140
190
140
190
mV
Output High, No Load
4.1
4.3
4.1
4.3
V
Output High, 2k to GND
3.3
3.8
3.3
3.8
V
I
S
Supply Current per Amplifier
14
21
15
24
A
The
denotes specifications which apply over the full operating temperature range of 0C T
A
70C, V
S
= 5V, 0V, V
CM
= 0.1V,
V
O
= 1.4V, unless noted.
LT1178/LT1179
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ELECTRICAL CHARACTERISTICS
LT1178AC/LT1179AC LT1178I/C/S/LT1179I/C/S
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
80
350
100
480
V
LT1178SW
150
900
V
LT1179SW
160
1050
V
LT1178S8
120
350
V
I
OS
lnput Offset Current
0.05
0.25
0.05
0.35
nA
I
B
Input Bias Current
3
5
3
6
nA
Input Voltage Range
13.5
13.9
13.5
13.9
V
15.0
15.3
15.0
15.3
V
CMRR
Common Mode Rejection Ratio
V
CM
= 13.5V, 15V
97
106
94
106
dB
PSRR
Power Supply Rejection Ratio
V
S
= 5V, 0V to 18V
96
112
94
112
dB
A
VOL
Large-Signal Voltage Gain
V
O
= 10V, R
L
= 50k
300
1200
250
1000
V/mV
V
O
= 10V, No Load
600
2500
400
2500
V/mV
V
OUT
Maximum Output Voltage Swing
R
L
= 50k
13.0
14.2
13.0
14.2
V
R
L
= 2k
11.0
12.7
11.0
12.7
V
SR
Slew Rate
A
V
= 1
0.02
0.04
0.02
0.04
V/s
GBW
Gain Bandwidth Product
f
O
5kHz
85
85
kHz
I
S
Supply Current per Amplifier
16
21
17
25
A
V
S
= 15V, T
A
= 25C, unless noted.
LT1178I/LT1179I
LT1178SW/LT1179SW
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
lnput Offset Voltage
LT1178
130
740
190
1150
V
LT1179
130
740
200
1300
V
V
OS
/T
Input Offset Voltage Drift
(Note 6)
0.7
4.0
0.9
5.5
V/C
I
OS
Input Offset Current
0.07
0.7
0.06
0.35
nA
I
B
Input Bias Current
4
8
3
7
nA
A
VOL
Large-Signal Voltage Gain
V
O
= 10V, R
L
= 50k
100
500
150
750
V/mV
CMRR
Common Mode Rejection Ratio
V
CM
= 13V, 14.9V
88
103
91
104
dB
PSRR
Power Supply Rejection Ratio
V
S
= 5V, 0V to 18V
88
109
91
110
dB
Maximum Output Voltage Swing
R
L
= 5k
11.0
13.5
11.0
13.5
V
I
S
Supply Current per Amplifier
19
30
18
28
A
The
denotes specifications which apply over the full operating temperature range of 40C T
A
85C for I grades,
0C T
A
70C for SW grades, V
S
= 15V, unless noted.
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