FEATURES
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LT2178/LT2179
17µA Max, Dual and Quad,
Single Supply, Precision Op Amps
DESCRIPTION
The LT
®
2178 is a micropower dual op amp in a surface
mount standard 8-pin configuration, the LT2179 is a
micropower quad op amp offered in a surface mount
14-pin package. Both devices are optimized for single
supply operation at 5V. Specifications are also provided
at
±15V
supply.
The extremely low supply current is combined with true
precision specifications: offset voltage is 30μV and offset
current is 50pA. Both offset parameters have low drift with
temperature. The 1.5pA
P-P
current noise and picoampere
offset current permit the use the megohm level source
resistors without introducing serious errors. Voltage
noise, at 0.9μV
P-P
, is remarkably low considering the low
supply current.
The LT2178/LT2179 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 surface mount applications where three times higher
supply current is acceptable, the micropower LT1077
single, LT2078 dual and LT2079 quad are recommended.
The LT1077/LT2078/LT2079 have significantly higher
bandwidth, slew rate, lower voltage noise and better output
drive capability. For applications requiring DIP packages
refer to the LT1178/LT1179.
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SO Package with Standard Pinout
Supply Current per Amplifier: 17μA Max
Offset Voltage: 70μV Max
Offset Current: 250pA Max
Input Bias Current: 5nA Max
Voltage Noise: 0.9μV
P-P
, 0.1Hz to 10Hz
Current Noise: 1.5pA
P-P
, 0.1Hz to 10Hz
Offset Voltage Drift: 0.5μV/°C
Gain Bandwidth Product: 85kHz
Slew Rate: 0.04V/μs
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
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Battery- or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Satellite Circuitry
Micropower Sample-and-Hold
Thermocouple Amplifier
Micropower Filters
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Self-Buffered, Dual Output, Micropower Reference
–
2
SUPPLY CURRENT PER AMPLIFIER A)
TOTAL BATTERY CURRENT = 28mA
OUTPUT ACCURACY = 0.4% MAX
TEMPERATURE COEFFICIENT = 20ppm/°C
LOAD REGULATION = 25ppm/mA, I
L
≤ 5mA, V
+
≥ 5V
LINE REGULATION = 10ppm/V
* 0.1% FILM RESISTORS
20
Supply Current vs Temperature
1/2 LT2178
1
250k
6
0.1μF
LT1004-1.2
2M
1M*
1M*
21789 TA01
–
+
+
3
1.2365V
OUTPUT
4V TO 9V
18
V
S
= 15V
16
4
5
8
7
2.470V
OUTPUT
1/2 LT2178
0.1μF
14
V
S
= 5V, 0V
12
V
S
= 1.5V
10
–50
–25
25
50
0
TEMPERATURE (°C)
75
100
21789fc
21789 TA02
1
LT2178/LT2179
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
Specified Temperature Range
Commercial.............................................. 0°C to 70°C
Industrial ............................................. –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V
–
4
–
+
OUT A 1
8
V
+
OUT B
–IN B
+IN B
–IN A 2
+IN A 3
V
+
4
B
C
+
+
–
+
–
14 OUT D
A
D
+
13 –IN D
12 +IN D
11 V
–
10 +IN C
9
8
–IN C
OUT C
A
–
7
B
+
6
5
+IN B 5
–IN B 6
OUT B 7
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 190°C/W
S PACKAGE
14-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT2178ACS8#PBF
LT2178AIS8#PBF
LT2178CS8#PBF
LT2178IS8#PBF
LT2179ACS#PBF
LT2179CS#PBF
LT2179IS#PBF
LEAD BASED FINISH
LT2178ACS8
LT2178AIS8
LT2178CS8
LT2178IS8
LT2179ACS
LT2179CS
LT2179IS
TAPE AND REEL
LT2178ACS8#TRPBF
LT2178AIS8#TRPBF
LT2178CS8#TRPBF
LT2178IS8#TRPBF
LT2179ACS#TRPBF
LT2179CS#TRPBF
LT2179IS#TRPBF
TAPE AND REEL
LT2178ACS8#TR
LT2178AIS8#TR
LT2178CS8#TR
LT2178IS8#TR
LT2179ACS#TR
LT2179CS#TR
LT2179IS#TR
PART MARKING
2178A
2178AI
2178
2178I
2179A
2179
2179I
PART MARKING
2178A
2178AI
2178
2178I
2179A
2179
2179I
PACKAGE DESCRIPTION
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
PACKAGE DESCRIPTION
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
8-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
14-Lead Plastic SO
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
2
–
–
21789fc
LT2178/LT2179
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
OS
ΔV
OS
ΔTime
I
OS
I
B
e
n
Input Offset Voltage
Long Term Input Offset
Voltage Stability
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Voltage Density
i
n
Input Noise Current
Input Noise Current Density
Input Resistance
Differential Mode
Common Mode
Input Voltage Range
CMRR
PSRR
A
VOL
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage Swing
V
CM
= 0V to 3.5V
V
S
= 2.2V to 12V
V
O
= 0.03V to 4V, No Load (Note 3)
V
O
= 0.03V to 3.5V, R
L
= 50k
Output Low, No Load
Output Low, 2k to GND
Output Low, I
SINK
= 100μA
Output High, No Load
Output High, 2k to GND
SR
GBW
I
S
Slew Rate
Gain Bandwidth Product
Supply Current per Amplifier
Channel Separation
Minimum Supply Voltage
A
V
= 1, C
L
= 10pF (Note 3)
f
O
≤ 5kHz
V
S
=
±1.5V,
V
O
= 0V
ΔV
IN
= 3V, RL = 10k
(Note 4)
4.2
3.5
0.1Hz to 10Hz (Note 2)
f
O
= 10Hz (Note 2)
f
O
= 1000Hz (Note 2)
0.1Hz to 10Hz (Note 2)
f
O
= 10Hz (Note 2)
f
O
= 1000Hz
(Note 3)
0.8
3.5
0
93
94
140
80
2
12
3.9
–0.3
103
104
700
200
6.5
0.2
120
4.4
3.8
60
13
12
110
2
2.2
18
17
9
0.6
160
4.2
3.5
0.6
3.5
0
90
92
110
70
2
12
3.9
–0.3
102
104
700
200
6.5
0.2
120
4.4
3.8
60
14
13
110
2
2.2
21
20
9
0.6
160
GΩ
GΩ
V
V
dB
dB
V/mV
V/mV
mV
mV
mV
V
V
V/μs
kHz
μA
μA
dB
V
CONDITIONS
LT2178
LT2179
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, T
A
= 25°C, unless otherwise noted.
LT2178AC/LT2178AI
LT2179AC
MIN
TYP MAX
30
35
0.5
0.05
3
0.9
50
49
1.5
0.03
0.01
0.25
5
2.0
75
65
2.5
0.07
70
100
LT2178C/LT2178I
LT2179C/LT2179I
MIN
TYP MAX
40
40
0.6
0.05
3
0.9
50
49
1.5
0.03
0.01
0.35
6
120
150
UNITS
μV
μV
μV/Mo
nA
nA
μV
P-P
nV√Hz
nV√Hz
pA
P-P
pA√Hz
pA√Hz
0.013 0.025
0.013 0.025
The
l
denotes the specifications which apply over the full operating temperature range. V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V,
–40°C ≤ T
A
≤ 85°C for I-grades, unless otherwise noted. (Note 6)
SYMBOL PARAMETER
V
OS
ΔV
OS
ΔT
I
OS
I
B
CMRR
PSRR
Input Offset Voltage
Input Offset Voltage Drift
Input Offset Current
Input Bias Current
Common Mode Rejection Ratio
Power Supply Rejection Ratio
V
CM
= 0.05V to 3.2V
V
S
= 3V to 12V
CONDITIONS
LT2178
LT2179
LT2178 (Note 5)
LT2179
l
l
l
l
l
l
l
LT2178AI
MIN
TYP MAX
70
80
0.4
0.5
0.07
3
86
88
100
100
270
300
1.8
3
0.70
7
LT2178I/LT2179I
MIN
TYP MAX
95
100
0.5
0.6
0.1
4
84
86
98
100
370
400
2.3
3.5
1
8
UNITS
μV
μV
μV/ºC
μV/ºC
nA
nA
dB
dB
21789fc
3
LT2178/LT2179
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
A
VOL
Large-Signal Voltage Gain
Maximum Output Voltage Swing
CONDITIONS
V
O
= 0.05V to 4V, No Load (Note 3)
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
I
S
Supply Current per Amplifier
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range. V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, –40°C ≤ T
A
≤ 85°C for I-grades, unless otherwise noted. (Note 6)
MIN
75
40
LT2178AI
TYP MAX
350
130
9
160
3.9
3
4.2
3.7
15
24
13
220
3.9
3
LT2178I/LT2179I
MIN
TYP MAX
50
30
350
130
9
160
4.2
3.7
15
27
13
220
UNITS
V/mV
V/mV
mV
mV
V
V
μA
The
l
denotes the specifications which apply over the full operating temperature range. V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V,
0°C ≤ T
A
≤ 70°C, unless otherwise noted. (Note 7)
SYMBOL PARAMETER
V
OS
ΔV
OS
ΔT
I
OS
I
B
CMRR
PSRR
A
VOL
Input Offset Voltage
Input Offset Voltage Drift
Input Offset Current
Input Bias Current
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage Swing
V
CM
= 0V to 3.4V
V
S
= 2.5V to 12V
V
O
= 0.05V to 4V, No Load (Note 3)
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
CONDITIONS
LT2178
LT2179
LT2178 (Note 5)
LT2179
l
l
l
l
l
l
l
l
l
l
l
l
l
l
LT2178AC/LT2179AC
MIN
TYP MAX
50
60
0.4
0.5
0.06
3
90
90
150
55
101
102
500
160
8
140
4.1
3.3
4.3
3.8
11
190
170
200
1.8
3
0.35
6
LT2178C/LT2179C
MIN
TYP MAX
65
70
0.5
0.6
0.06
3
86
88
80
45
100
102
500
160
8
140
4.1
3.3
4.3
3.8
11
190
250
290
2.5
3.5
0.5
7
UNITS
V/mV
V/mV
mV
mV
nA
nA
dB
dB
V/mV
V/mV
mV
mV
V
V
V
S
=
±15V,
T
A
= 25°C, unless otherwise noted.
LT2178AC/LT2178AI
LT2179AC
MIN
TYP MAX
70
80
0.05
3
13.5
–15
V
CM
= 13.5V to –15V
V
S
= 5V, 0V to
±18V
V
O
=
±10V,
R
L
= 50k
V
O
=
±10V,
No Load
R
L
= 50k
R
L
= 2k
A
V
= 1
96
96
300
600
±13
±11
0.02
13.9
–15.3
106
112
1200
2500
±14.2
±12.7
0.04
300
350
0.25
5
13.5
–15
93
94
250
400
±13
±11
0.02
LT2178C/LT2178I
LT2179C/LT2179I
MIN
TYP MAX
90
100
0.05
3
13.9
–15.3
106
112
1000
2500
±14.2
±12.7
0.04
400
450
0.35
6
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
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage Swing
Slew Rate
CONDITIONS
LT2178
LT2179
UNITS
μV
μV
nA
nA
V
V
dB
dB
V/mV
V/mV
V
V
V/μs
21789fc
4
LT2178/LT2179
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
GBW
I
S
Gain Bandwidth Product
Supply Current per Amplifier
CONDITIONS
f
O
≤ 5kHz
The
l
denotes the specifications which apply over the full operating
temperature range. V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, –40°C ≤ T
A
≤ 85°C for I-grades, unless otherwise noted. (Note 6)
LT2178AC/LT2178AI
LT2179AC
MIN
TYP MAX
85
16
21
LT2178C/LT2178I
LT2179C/LT2179I
MIN
TYP MAX
85
17
25
UNITS
kHz
μA
The
l
denotes the specifications which apply over the full operating temperature range. V
S
= ±15V, –40°C ≤ T
A
≤ 85°C for I-grades,
unless otherwise noted.
SYMBOL PARAMETER
V
OS
ΔV
OS
ΔT
I
OS
I
B
A
VOL
CMRR
PSRR
I
S
Input Offset Voltage
Input Offset Voltage Drift
Input Offset Current
Input Bias Current
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Maximum Output Voltage Swing
Supply Current per Amplifier
V
O
=
±10V,
R
L
= 50k
V
CM
= 13V, –14.9V
V
S
= 0V, 5V to
±18V
R
L
= 5k
CONDITIONS
LT2178
LT2179
LT2178 (Note 5)
LT2179
l
l
l
l
l
l
l
l
l
l
LT2178AI
MIN
TYP MAX
100
100
0.6
0.7
0.07
3
150
90
92
±11
500
105
110
±13.5
18
28
650
650
1.8
3
0.7
7
LT2178I/LT2179I
MIN
TYP MAX
130
130
0.7
0.9
0.1
4
100
88
88
±11
500
103
109
±13.5
19
30
740
740
2.5
4
1
8
UNITS
μV
μV
μV/ºC
μV/ºC
nA
nA
V/mV
dB
dB
V
μA
The
l
denotes the specifications which apply over the full operating temperature range. V
S
=
±15V,
0°C ≤ T
A
≤ 70°C, unless otherwise noted.
SYMBOL PARAMETER
V
OS
ΔV
OS
ΔT
I
OS
I
B
A
VOL
CMRR
PSRR
I
S
Input Offset Voltage
Input Offset Voltage Drift
Input Offset Current
Input Bias Current
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Maximum Output Voltage Swing
Supply Current per Amplifier
V
O
=
±10V,
R
L
= 50k
V
CM
= 13V, –15V
R
L
= 5k
R
L
= 5k
CONDITIONS
LT2178
LT2179
LT2178 (Note 5)
LT2179
l
l
l
l
l
l
l
l
l
l
LT2178AC/LT2179AC
MIN
TYP MAX
100
120
0.6
0.7
0.06
3
200
94
93
±11
800
104
110
±13.6
17
24
480
550
1.5
3
0.35
6
LT2178C/LT2179C
MIN
TYP MAX
130
150
0.7
0.9
0.06
3
150
91
91
±11
750
104
110
±13.6
18
28
660
750
2.5
4
0.35
7
UNITS
μV
μV
μV/ºC
μV/ºC
nA
nA
V/mV
dB
dB
V
μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Typical parameters are defined as the 60% yield of parameter
distributions of individual amplifiers, i.e., out of 100 LT2179s (or 100
LT2178s) typically 240 op amps (or 120) will be better than the indicated
specification.
Note 3:
This parameter is tested on a sample basis only. All noise
parameters are tested with V
S
=
±2.5V,
V
O
= 0V.
Note 4:
This parameter is guaranteed by design and is not tested.
Note 5:
Power supply rejection ratio is measured at the minimum supply
voltage. The op amps actually work at 1.7V supply but with a typical offset
skew of –300μV.
Note 6:
This parameter is not 100% tested.
Note 7:
During testing at –40°C, the 5V power supply turn-on time is less
than 0.5s.
Note 8:
The LT2178C/LT2179C are designed, characterized and expected
to meet the industrial temperature limits, but are not tested at –40°C and
85°C. I-grade parts are guaranteed.
21789fc
5
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