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Электронный компонент: LT2078A

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1
LT 2078/LT 2079
Micropower, Dual and
Quad, Single Supply,
Precision Op Amps
FEATURES
s
SO Package with Standard Pinout
s
Supply Current per Amplifier: 50
A Max
s
Offset Voltage: 70
V Max
s
Offset Current: 250pA Max
s
Voltage Noise: 0.6
V
P-P
, 0.1Hz to 10Hz
s
Current Noise: 3pA
P-P
, 0.1Hz to 10Hz
s
Offset Voltage Drift: 0.4
V/
C
s
Gain Bandwidth Product: 200kHz
s
Slew Rate: 0.07V/
s
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
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 ampmicropower 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 currentno 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
Battery or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Satellite Circuitry
s
Micropower Sample-and-Hold
s
Thermocouple Amplifier
s
Micropower Filters
TYPICAL APPLICATIO
N
U
Single Battery, Micropower, Gain = 100, Instrumentation Amplifier
Distribution of Input Offset Voltage
INPUT OFFSET VOLTAGE (
V)
120
NUMBER OF OP AMPS
0
80
2078/79 TA02
80
40
40
800
700
600
500
400
300
200
100
0
120
V
S
= 5V, 0V
5000 OP AMPS
+
+
INVERTING
INPUT
1M
2
3
1
6
5
7
A
1/2 LT2078
10.1k
1M
10.1k
NONINVERTING
+INPUT
B
1/2 LT2078
4
8
3V
(Li-Ion)
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
LT2078/79 TA01
APPLICATIO
N
S
U
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2
LT2078/LT 2079
ABSOLUTE
M
AXI
M
U
M
RATINGS
W
W
W
U
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
T
JMAX
= 150
C,
JA
= 150
C/ W
T
JMAX
= 150
C,
JA
= 190
C/ W
Consult factory for Military grade parts.
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, T
A
= 25
C, unless otherwise noted.
LT2078AC/LT2078AI
LT2078C/LT2078I
LT2079AC/LT2079AI
LT2079C/LT2079I
SYMBOL
PARAMETER
CONDITIONS (NOTE 1)
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT2078
30
70
40
120
V
LT2079
35
110
40
150
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
95
110
92
108
dB
PSRR
Power Supply Rejection Ratio
V
S
= 2.3V to 12V
100
114
98
114
dB
ELECTRICAL CHARACTERISTICS
ORDER PART
NUMBER
LT2078ACS8
LT2078AIS8
LT2078CS8
LT2078IS8
2078A
2078AI
2078
2078I
PART MARKING
PACKAGE/ORDER I
N
FOR
M
ATIO
N
W
U
U
ORDER PART
NUMBER
LT2079AC
LT2079AI
LT2079C
LT2079I
1
2
3
4
8
7
6
5
TOP VIEW
V
+
OUT B
IN B
+IN B
OUT A
IN A
+IN A
V
S8 PACKAGE
8-LEAD PLASTIC SO
A
B
TOP VIEW
S PACKAGE
14-LEAD PLASTIC SO
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
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3
LT 2078/LT 2079
ELECTRICAL CHARACTERISTICS
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, T
A
= 25
C, unless otherwise noted.
LT2078AC/LT2078AI
LT2078C/LT2078I
LT2079AC/LT2079AI
LT2079C/LT2079I
SYMBOL
PARAMETER
CONDITIONS (NOTE 1)
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
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
1.2
0.55
1.2
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, f
10Hz
110
110
dB
Minimum Supply Voltage
(Note 4)
2.2
2.3
2.2
2.3
V
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, 40
C
T
A
85
C for I grades, unless otherwise noted.
LT2078AI/LT2079AI
LT2078I/LT2079I
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT2078
q
70
250
95
370
V
LT2079
q
80
280
100
400
V
V
OS
Input Offset Voltage Drift
LT2078
q
0.4
1.8
0.5
2.5
V/
C
T
(Note 5)
LT2079
q
0.6
3.0
0.6
3.5
V/
C
I
OS
Input Offset Current
q
0.07
0.70
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
90
106
86
104
dB
PSRR
Power Supply Rejection Ratio
V
S
= 3.1V to 12V
q
96
110
92
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
LT2078AC/LT2079AC
LT2078C/LT2079C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT2078
q
50
150
60
240
V
LT2079
q
60
180
70
270
V
V
OS
Input Offset Voltage Drift
LT2078
q
0.4
1.8
0.5
2.5
V/
C
T
(Note 5)
LT2079
q
0.5
3.0
0.6
3.5
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
92
108
88
106
dB
PSRR
Power Supply Rejection Ratio
V
S
= 2.6V to 12V
q
98
112
95
112
dB
V
S
= 5V, 0V, V
CM
= 0.1V, V
O
= 1.4V, 0
C
T
A
70
C, unless otherwise noted (Note 6).
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4
LT2078/LT 2079
ELECTRICAL CHARACTERISTICS
LT2078AC/LT2079AC
LT2078C/LT2079C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
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.
V
S
=
15V, T
A
= 25
C, unless otherwise noted.
LT2078AC/LT2078AI
LT2078C/LT2078I
LT2079AC/LT2079AI
LT2079C/LT2079I
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT2078
50
250
70
350
V
LT2079
60
350
80
450
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
98
114
95
114
dB
PSRR
Power Supply Rejection Ratio
V
S
= 5V, 0V to
18V
100
114
98
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, unless otherwise noted.
LT2078AI/LT2079AI
LT2078I/LT2079I
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT2078
q
90
430
120
600
V
LT2079
q
100
500
130
700
V
V
OS
Input Offset Voltage Drift
LT2078
q
0.5
1.8
0.6
2.5
V/
C
T
(Note 5)
LT2079
q
0.6
3.0
0.7
3.8
V/
C
I
OS
Input Offset Current
q
0.07
0.70
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
92
110
88
110
dB
PSRR
Power Supply Rejection Ratio
V
S
= 5V, 0V to
18V
q
96
110
92
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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5
LT 2078/LT 2079
ELECTRICAL CHARACTERISTICS
V
S
=
15V, 0
C
T
A
70
C, unless otherwise noted (Note 6).
LT2078AC/LT2079AC
LT2078C/LT2079C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT2078
q
70
330
90
460
V
LT2079
q
80
410
100
540
V
V
OS
Input Offset Voltage Drift
LT2078
q
0.5
1.8
0.6
2.5
V/
C
T
(Note 5)
LT2079
q
0.6
3.0
0.7
3.8
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
A
VOL
Large-Signal Voltage Gain
V
O
=
10V, R
L
= 5k
q
300
1200
250
1200
V/mV
CMRR
Common Mode Rejection Ratio
V
CM
= 13V, 15V
q
95
112
92
112
dB
PSRR
Power Supply Rejection Ratio
V
S
= 5V, 0V to
18V
q
98
112
95
112
dB
Maximum Output Voltage Swing
R
L
= 5k
q
11.0
13.6
11.0
13.6
V
I
S
Supply Current per Amplifier
q
49
73
50
85
A
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 300
V.
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 PERFOR
M
A
N
CE CHARACTERISTICS
U
W
Input Bias Current vs
Common Mode Voltage
COMMON MODE VOLTAGE (V)
1
INPUT BIAS CURRENT (nA)
0
2
4
6
8
10
12
0
1
2
3
LT2078/79 TPC03
4
T
A
= 125
C
T
A
= 55
C
V
S
= 5V, 0V
T
A
= 25
C
Input Bias and Offset Currents vs
Temperature
TEMPERATURE (
C)
50
BIAS CURRENT (nA)
OFFSET CURRENT (pA)
100
50
0
5
6
7
0
50
75
LT2078/79 TPC02
25
25
100
125
I
OS
I
B
V
S
= 5V, 0V TO
15V
Distribution of Offset Voltage
Drift with Temperature
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (
V/
C)
PERCENT OF UNITS (%)
25
20
15
10
5
0
LT2078/79 TPC01
2
1
0
1
2
V
S
= 5V, 0V
V
CM
= 0.1V
80 LT2078'S
25 LT2079'S
= 260 OP AMPS