LT 2078/LT 2079
Micropower, Dual and
Quad, Single Supply,
Precision Op Amps
FEATURES
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DESCRIPTION
The LT
®
2078 is a micropower dual op amp in 8-pin small
outline, standard surface mount package, and LT2079 is
a micropower quad op amp offered in the standard 14-pin
surface mount package. 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 LT2078/LT2079 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.
Both the LT2078/LT2079 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 resis-
tors are needed. For applications requiring DIP packages
refer to the LT1078/LT1079.
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
SO Package with Standard Pinout
Supply Current per Amplifier: 50µA Max
Offset Voltage: 70µV Max
Offset Current: 250pA Max
Voltage Noise: 0.6µV
P-P
, 0.1Hz to 10Hz
Current Noise: 3pA
P-P
, 0.1Hz to 10Hz
Offset Voltage Drift: 0.4µV/°C
Gain Bandwidth Product: 200kHz
Slew Rate: 0.07V/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
s
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
TYPICAL APPLICATION
Single Battery, Micropower, Gain = 100, Instrumentation Amplifier
10.1k
1M
1M
3V
(Li-Ion)
8
7
OUT
Distribution of Input Offset Voltage
800
700
V
S
= 5V, 0V
5000 OP AMPS
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 = 85
µV
P-P
0.1Hz TO 10Hz
= 300
µV
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
+
+
INVERTING 3
–INPUT
NONINVERTING 5
+INPUT
–
A
1/2 LT2078
1
10.1k
6
NUMBER OF OP AMPS
–
2
600
500
400
300
200
100
0
–120
–80
–40
40
80
0
INPUT OFFSET VOLTAGE (µV)
120
2078/79 • TA02
B
1/2 LT2078
4
LT2078/79 • TA01
U
U
U
1
LT2078/LT 2079
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
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V
–
4
A
B
8
7
6
5
V
+
OUT B
–IN B
+IN B
ORDER PART
NUMBER
LT2078ACS8
LT2078AIS8
LT2078CS8
LT2078IS8
PART MARKING
2078A 2078
2078AI 2078I
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 190°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
= 2.3V to 12V
LT2078
LT2079
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, T
A
= 25°C, unless otherwise noted.
LT2078AC/LT2078AI
LT2079AC/LT2079AI
MIN
TYP
MAX
30
35
0.4
0.05
6
0.25
8
1.2
45
37
4.0
0.10
70
110
LT2078C/LT2078I
LT2079C/LT2079I
MIN
TYP
MAX
40
40
0.5
0.05
6
0.6
29
28
2.3
0.06
0.02
300
3.5
0
92
98
800
6
3.8
– 0.3
108
114
0.35
10
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)
400
3.5
0
95
100
2
U
U
W
W W
U
W
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
ORDER PART
NUMBER
LT2079AC
LT2079AI
LT2079C
LT2079I
S PACKAGE
14-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/ W
UNITS
µV
µV
µV/Mo
nA
nA
µV
P-P
nV√Hz
nV√Hz
pA
P-P
pA√Hz
pA√Hz
MΩ
GΩ
V
V
dB
dB
0.6
29
28
2.3
0.06
0.02
800
6
3.8
– 0.3
110
114
LT 2078/LT 2079
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.
LT2078AC/LT2078AI
LT2079AC/LT2079AI
MIN
TYP
MAX
200
150
1000
600
3.5
0.55
95
4.2
3.5
0.04
4.4
3.9
0.07
200
38
50
6
1.0
130
4.2
3.5
0.04
LT2078C/LT2078I
LT2079C/LT2079I
MIN
TYP
MAX
150
120
1000
600
3.5
0.55
95
4.4
3.9
0.07
200
39
110
2.3
2.2
2.3
55
6
1.0
130
CONDITIONS (NOTE 1)
V
O
= 0.03V to 4V, No Load
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
dB
V
SR
GBW
I
S
Slew Rate
Gain Bandwidth Product
Supply Current per Amplifier
Channel Separation
Minimum Supply Voltage
A
V
= 1, V
S
=
±2.5V
f
O
≤
20kHz
∆V
IN
= 3V, R
L
= 10k, f
≤
10Hz
(Note 4)
110
2.2
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, – 40°C
≤
T
A
≤
85°C for I grades, unless otherwise noted.
SYMBOL PARAMETER
V
OS
∆V
OS
∆T
I
OS
I
B
CMRR
PSRR
A
VOL
Input Offset Voltage
Input Offset Voltage Drift
(Note 5)
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
= 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
I
S
Supply Current per Amplifier
CONDITIONS
LT2078
LT2079
LT2078
LT2079
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
LT2078AI/LT2079AI
MIN
TYP
MAX
70
80
0.4
0.6
0.07
7
90
96
110
80
106
110
600
400
4.5
125
3.9
3.0
4.2
3.7
43
60
8
170
250
280
1.8
3.0
0.70
10
LT2078I/LT2079I
MIN
TYP
MAX
95
100
0.5
0.6
0.1
7
86
92
80
60
104
110
600
400
4.5
125
3.9
3.0
4.2
3.7
45
70
8
170
370
400
2.5
3.5
1.0
12
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 6).
SYMBOL PARAMETER
V
OS
∆V
OS
∆T
I
OS
I
B
CMRR
PSRR
Input Offset Voltage
Input Offset Voltage Drift
(Note 5)
Input Offset Current
Input Bias Current
Common Mode Rejection Ratio V
CM
= 0V to 3.4V
Power Supply Rejection Ratio
V
S
= 2.6V to 12V
CONDITIONS
LT2078
LT2079
LT2078
LT2079
q
q
q
q
q
q
q
q
LT2078AC/LT2079AC
MIN
TYP
MAX
50
60
0.4
0.5
0.06
6
92
98
108
112
150
180
1.8
3.0
0.35
9
LT2078C/LT2079C
MIN
TYP
MAX
60
70
0.5
0.6
0.06
6
88
95
106
112
240
270
2.5
3.5
0.50
11
UNITS
µV
µV
µV/°C
µV/°C
nA
nA
dB
dB
3
LT2078/LT 2079
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.
LT2078AC/LT2079AC
MIN
TYP
MAX
q
q
q
q
q
q
q
LT2078C/LT2079C
MIN
TYP
MAX
110
80
750
500
4.0
105
4.1
3.3
4.3
3.8
42
63
7
150
UNITS
V/mV
V/mV
mV
mV
V
V
µA
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
150
110
750
500
4.0
105
7
150
4.1
3.3
4.3
3.8
40
55
I
S
Supply Current per Amplifier
V
S
=
±15V,
T
A
= 25°C, unless otherwise noted.
LT2078AC/LT2078AI
LT2079AC/LT2079AI
MIN
TYP
MAX
50
60
0.05
6
13.5
–15.0
98
100
1000
400
±13.0
±11.0
0.06
V
S
= 5V, 0V to
±18V
V
O
=
±10V,
R
L
= 50k
V
O
=
±10V,
R
L
= 2k
R
L
= 50k
R
L
= 2k
13.8
–15.3
114
114
5000
1100
±14.0
±13.2
0.10
46
65
250
350
0.25
8
13.5
–15.0
95
98
1000
300
±13.0
±11.0
0.06
LT2078C/LT2078I
LT2079C/LT2079I
MIN
TYP
MAX
70
80
0.05
6
13.8
–15.3
114
114
5000
1100
±14.0
±13.2
0.10
47
75
350
450
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
LT2078
LT2079
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
=
±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
(Note 5)
Input Offset Current
Input Bias Current
Large-Signal Voltage Gain
V
O
=
±10V,
R
L
= 5k
V
S
= 5V, 0V to
±18V
CONDITIONS
LT2078
LT2079
LT2078
LT2079
q
q
q
q
q
q
q
q
q
q
q
LT2078AI/LT2079AI
MIN
TYP
MAX
90
100
0.5
0.6
0.07
7
200
92
96
±11.0
700
110
110
±13.5
52
80
430
500
1.8
3.0
0.70
10
LT2078I/LT2079I
MIN
TYP
MAX
120
130
0.6
0.7
0.1
7
150
88
92
±11.0
700
110
110
±13.5
54
95
600
700
2.5
3.8
1.0
12
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 2078/LT 2079
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
OS
∆V
OS
∆T
I
OS
I
B
A
VOL
CMRR
PSRR
Input Offset Voltage
Input Offset Voltage Drift
(Note 5)
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
= 5k
V
CM
= 13V, –15V
V
S
= 5V, 0V to
±18V
R
L
= 5k
CONDITIONS
LT2078
LT2079
LT2078
LT2079
V
S
=
±15V,
0°C
≤
T
A
≤
70°C, unless otherwise noted (Note 6).
LT2078AC/LT2079AC
MIN
TYP
MAX
q
q
q
q
q
q
q
q
q
q
q
LT2078C/LT2079C
MIN
TYP
MAX
90
100
0.6
0.7
0.06
6
250
92
95
±11.0
1200
112
112
±13.6
50
85
460
540
2.5
3.8
0.50
11
UNITS
µV
µV
µV/°C
µV/°C
nA
nA
V/mV
dB
dB
V
µA
70
80
0.5
0.6
0.06
6
300
95
98
±11.0
1200
112
112
±13.6
49
330
410
1.8
3.0
0.35
9
73
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 LT2079s (or 100
LT2078s) 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 1.8V supply but with a typical offset
skew of –300µV.
Note 5:
This parameter is not 100% tested.
Note 6:
The LT2078C/LT2079C 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 Offset Voltage
Drift with Temperature
25
V
S
= 5V, 0V
V
CM
= 0.1V
80 LT2078'S
25 LT2079'S
= 260 OP AMPS
OFFSET CURRENT (pA)
INPUT BIAS CURRENT (nA)
20
PERCENT OF UNITS (%)
15
BIAS CURRENT (nA)
10
5
0
–2
0
1
–1
2
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C)
LT2078/79 • TPC01
U W
Input Bias and Offset Currents vs
Temperature
100
V
S
= 5V, 0V TO
±15V
I
OS
Input Bias Current vs
Common Mode Voltage
0
V
S
= 5V, 0V
–2
–4
–6
–8
–10
–12
–1
0
1
2
3
COMMON MODE VOLTAGE (V)
4
T
A
= 125°C
T
A
= –55°C
T
A
= 25°C
50
0
–5
I
B
–6
–7
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
LT2078/79 • TPC02
LT2078/79 • TPC03
5
嵌入式系统
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