LT 2178/LT 2179
17µA Max, Dual and Quad,
Single Supply, Precision Op Amps
FEATURES
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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 opera-
tion 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.
s
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
s
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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 APPLICATION
Self-Buffered, Dual Output, Micropower Reference
2
SUPPLY CURRENT PER AMPLIFIER (µA)
TOTAL BATTERY CURRENT = 28
µA
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
1/2 LT2178
1
250k
6
2M
0.1µF
LT1004-1.2
1M*
1M*
LT2178/79 • TA01
–
+
+
3
1.2365V
OUTPUT
4V TO 9V
4
5
8
7
2.470V
OUTPUT
1/2 LT2178
0.1µF
U
U
U
Supply Current vs Temperature
20
–
18
V
S
=
±15V
16
14
V
S
= 5V, 0V
12
V
S
=
±1.5V
10
–50
–25
25
50
0
TEMPERATURE (°C)
75
100
LT2178/79 • TPC02
1
LT2178/LT 2179
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
PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V
–
4
–
+
8
A
–
V
+
OUT B
–IN B
+IN B
7
B
+
6
5
–IN B 6
OUT B 7
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 190°C/ W
PART MARKING
2178A 2178
2178AI 2178I
S PACKAGE
14-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/ W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
OS
∆V
OS
∆Time
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
Common Mode Rejection Ratio V
CM
= 0V to 3.5V
Power Supply Rejection Ratio
V
S
= 2.2V to 12V
LT2178
LT2179
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, T
A
= 25°C, unless otherwise noted.
LT2178AC/LT2178AI
LT2179AC/LT2179AI
MIN
TYP
MAX
30
35
0.5
0.05
3
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
0.6
3.5
0
90
92
2.0
12
3.9
– 0.3
102
104
0.35
6
120
150
CONDITIONS (NOTE 1)
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
0.9
50
49
1.5
0.03
0.01
2.0
12
3.9
– 0.3
103
104
2
–
B
C
+
–
+
LT2178ACS8
LT2178AIS8
LT2178CS8
LT2178IS8
U
U
W
W W
U
W
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V
+
4
+IN B 5
–
+
–
14 OUT D
A
D
+
13 –IN D
12 +IN D
11 V
–
10 +IN C
9
8
–IN C
OUT C
ORDER PART
NUMBER
LT2179ACS
LT2179AIS
LT2179CS
LT2179IS
UNITS
µV
µV
µV/Mo
nA
nA
µV
P-P
nV√Hz
nV√Hz
pA
P-P
pA√Hz
pA√Hz
GΩ
GΩ
V
V
dB
dB
LT 2178/LT 2179
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
A
VOL
Large-Signal Voltage Gain
Maximum Output Voltage
Swing
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, T
A
= 25°C, unless otherwise noted.
LT2178AC/LT2178AI
LT2179AC/LT2179AI
MIN
TYP
MAX
140
80
700
200
6.5
0.2
120
4.2
3.5
0.013
4.4
3.8
0.025
60
13
12
110
2.0
2.2
18
17
9
0.6
160
4.2
3.5
0.013
LT2178C/LT2178I
LT2179C/LT2179I
MIN
TYP
MAX
110
70
700
200
6.5
0.2
120
4.4
3.8
0.025
60
14
13
110
2.0
2.2
21
20
9
0.6
160
CONDITIONS (NOTE 1)
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
UNITS
V/mV
V/mV
mV
mV
mV
V
V
V/µs
kHz
µA
µA
dB
V
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
∆V
IN
= 3V, R
L
= 10k
(Note 4)
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
∆V
OS
∆T
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 V
CM
= 0.05V to 3.2V
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage
Swing
V
S
= 3V 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
I
S
Supply Current per Amplifier
CONDITIONS
LT2178
LT2179
LT2178 (Note 5)
LT2179
q
q
q
q
q
q
q
q
q
q
q
q
q
q
LT2178AI/LT2179AI
MIN
TYP
MAX
70
80
0.4
0.5
0.07
3
86
88
75
40
100
100
350
130
9
160
3.9
3.0
4.2
3.7
15
24
13
220
270
300
1.8
3.0
0.70
7
LT2178I/LT2179I
MIN
TYP
MAX
95
100
0.5
0.6
0.1
4
84
86
50
30
98
100
350
130
9
160
3.9
3.0
4.2
3.7
15
27
13
220
370
400
2.5
3.5
1.0
8
UNITS
µV
µV
µV/°C
µV/°C
nA
nA
dB
dB
V/mV
V/mV
mV
mV
V
V
µA
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
∆V
OS
∆T
I
OS
I
B
CMRR
PSRR
Input Offset Voltage
Input Offset Voltage Drift
Input Offset Current
Input Bias Current
Common Mode Rejection Ratio V
CM
= 0V to 3.4V
Power Supply Rejection Ratio
V
S
= 2.5V to 12V
CONDITIONS
LT2178
LT2179
LT2178 (Note 5)
LT2179
q
q
q
q
q
q
q
LT2178AC/LT2179AC
MIN
TYP
MAX
50
60
0.4
0.5
0.06
3
90
90
101
102
170
200
1.8
3.0
0.35
6
LT2178C/LT2179C
MIN
TYP
MAX
65
70
0.5
0.6
0.06
3
86
88
100
102
250
290
2.5
3.5
0.50
7
UNITS
µV
µV
µV/°C
µV/°C
nA
nA
dB
dB
3
LT2178/LT 2179
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
A
VOL
Large-Signal Voltage Gain
Maximum Output Voltage
Swing
CONDITIONS
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, 0°C
≤
T
A
≤
70°C, unless otherwise noted.
LT2178AC/LT2179AC
MIN
TYP
MAX
q
q
q
q
q
q
q
LT2178C/LT2179C
MIN
TYP
MAX
80
45
500
160
8
140
4.1
3.3
4.3
3.8
15
24
11
190
UNITS
V/mV
V/mV
mV
mV
V
V
µA
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
150
55
500
160
8
140
11
190
4.1
3.3
4.3
3.8
14
21
I
S
Supply Current per Amplifier
V
S
=
±15V,
T
A
= 25°C, unless otherwise noted.
LT2178AC/LT2178AI
LT2179AC/LT2179AI
MIN
TYP
MAX
70
300
80
350
0.05
3
13.5
–15.0
96
96
300
600
±13.0
±11.0
0.02
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
f
O
≤
5kHz
13.9
–15.3
106
112
1200
2500
±14.2
±12.7
0.04
85
16
21
0.25
5
13.5
–15.0
93
94
250
400
±13.0
±11.0
0.02
LT2178C/LT2178I
LT2179C/LT2179I
MIN
TYP
MAX
90
400
100
450
0.05
3
13.9
–15.3
106
112
1000
2500
±14.2
±12.7
0.04
85
17
25
0.35
6
SYMBOL PARAMETER
V
OS
Input Offset Voltage
I
OS
I
B
Input Offset Current
Input Bias Current
Input Voltage Range
CMRR
PSRR
A
VOL
V
OUT
SR
GBW
I
S
CONDITIONS
LT2178
LT2179
UNITS
µV
µV
nA
nA
V
V
dB
dB
V/mV
V/mV
V
V
V/µs
kHz
µA
Common Mode Rejection Ratio V
CM
= 13.5V to –15V
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Maximum Output Voltage
Swing
Slew Rate
Gain Bandwidth Product
Supply Current per Amplifier
V
S
=
±15V,
– 40°C
≤
T
A
≤
85°C for I grades, unless otherwise noted.
SYMBOL PARAMETER
V
OS
∆V
OS
∆T
I
OS
I
B
A
VOL
CMRR
PSRR
Input Offset Voltage
Input Offset Voltage Drift
Input Offset Current
Input Bias Current
Large-Signal Voltage Gain
V
O
=
±10V,
R
L
= 50k
V
S
= 0V, 5V to
±18V
CONDITIONS
LT2178
LT2179
LT2178 (Note 5)
LT2179
q
q
q
q
q
q
q
q
q
q
LT2178AI/LT2179AI
MIN
TYP
MAX
100
100
0.6
0.7
0.07
3
150
90
92
±11.0
500
105
110
±13.5
18
28
650
650
1.8
3.0
0.70
7
LT2178I/LT2179I
MIN
TYP
MAX
130
130
0.7
0.9
0.1
4
100
88
88
±11.0
500
103
109
±13.5
19
30
740
740
2.5
4.0
1.0
8
UNITS
µV
µV
µV/°C
µV/°C
nA
nA
V/mV
dB
dB
V
µA
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
4
LT 2178/LT 2179
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
OS
∆V
OS
∆T
I
OS
I
B
A
VOL
CMRR
PSRR
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
I
S
Supply Current per Amplifier
V
O
=
±10V,
R
L
= 50k
V
CM
= 13V, –15V
V
S
= 5V, 0V to
±18V
R
L
= 5k
CONDITIONS
LT2178
LT2179
LT2178 (Note 5)
LT2179
V
S
=
±15V,
0°C
≤
T
A
≤
70°C, unless otherwise noted.
LT2178AC/LT2179AC
MIN
TYP
MAX
q
q
q
LT2178C/LT2179C
MIN
TYP
MAX
130
150
0.7
0.9
0.06
3
150
91
91
±11.0
750
104
110
±13.6
18
28
660
750
2.5
4.0
0.35
7
UNITS
µV
µV
µV/°C
µV/°C
nA
nA
V/mV
dB
dB
V
µA
100
120
0.6
0.7
0.06
3
200
94
93
±11.0
800
104
110
±13.6
17
480
550
1.8
3.0
0.35
6
q
q
q
q
q
q
q
24
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1:
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 2:
This parameter is tested on a sample basis only. All noise
parameters are tested with V
S
=
±2.5V,
V
O
= 0V.
Note 3:
This parameter is guaranteed by design and is not tested.
Note 4:
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 5:
This parameter is not 100% tested.
Note 6:
During testing at –40°C, the 5V power supply turn-on time is less
than 0.5s.
Note 7:
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.
TYPICAL PERFORMANCE CHARACTERISTICS
Distribution of Input
Offset Voltage
800
V
S
= 5V, 0V
T
A
= 25°C
2500 OP AMPS
TESTED
100
INPUT OFFSET
CURRENT (pA)
OFFSET VOLTAGE SHIFT (µV)
NUMBER OF OP AMPS
600
400
–300
NONFUCTIONAL
–400
INPUT BIAS
CURRENT (nA)
200
0
–150 –100
100
–50
0
50
OFFSET VOLTAGE (µV)
U W
LT2178/79 • TPC01
Minimum Supply Voltage
100
V
–
= 0V
0
–100
85°C
–200
25°C
– 40°C
–2.5
–3.0
–3.5
75
50
25
Input Bias and Offset Currents vs
Temperature
V
S
= 5V, 0V
I
OS
I
B
–500
150
0
2
3
1
POSITIVE SUPPLY VOLTAGE (V)
LT2178/79 • TPC02
–4.0
–50
–25
50
25
0
TEMPERATURE (°C)
75
100
LT2178/79 • TPC03
5
PCB设计
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