LT2078CS8#PBF [Linear]
LT2078 - Micropower, Dual and Quad, Single Supply, Precision Op Amps; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C;
| 型号： | LT2078CS8#PBF |
| 厂家： | 
Linear |
| 描述： | LT2078 - Micropower, Dual and Quad, Single Supply, Precision Op Amps; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C 运算放大器 放大器电路 光电二极管 |
| 文件： | 总16页 (文件大小：433K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT2078/LT2079
Micropower, Dual and
Quad, Single Supply,
Precision Op Amps
U
FEATURES
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.
■
SO Package with Standard Pinout
■
Supply Current per Amplifier: 50µA Max
■
Offset Voltage: 70µV Max
■
Offset Current: 250pA Max
■
Voltage Noise: 0.6µVP-P, 0.1Hz to 10Hz
■
Current Noise: 3pAP-P, 0.1Hz to 10Hz
■
Offset Voltage Drift: 0.4µV/°C
Micropowerperformanceofcompetingdevicesisachieved
at the expense of seriously degrading precision, noise,
speedandoutputdrivespecifications. Thedesigneffortof
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.
■
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
U
APPLICATIONS
■
Battery or Solar-Powered Systems
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
Portable Instrumentation
Remote Sensor Amplifier
Satellite Circuitry
■
Micropower Sample-and-Hold
■
Thermocouple Amplifier
Micropower Filters
■
refer to the LT1078/LT1079.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATION
Single Battery, Micropower, Gain = 100, Instrumentation Amplifier
Distribution of Input Offset Voltage
800
10.1k
1M
V
= 5V, 0V
S
5000 OP AMPS
700
600
500
400
300
200
100
0
3V
(Li-Ion)
1M
–
2
3
10.1k
–
8
A
6
5
1
1/2 LT2078
B
+
7
INVERTING
–INPUT
OUT
1/2 LT2078
+
NONINVERTING
+INPUT
4
LT2078/79 • TA01
TYPICAL PERFORMANCE
OUTPUT NOISE = 8µ5V 0.1Hz TO 10Hz
P-P
INPUT OFFSET VOLTAGE = 40µV
INPUT OFFSET CURRENT = 0.2nA
TOTAL POWER DISSIPATION = 240µW
COMMON MODE REJECTION = 110dB (AMPLIFIER LIMITED)
GAIN BANDWIDTH PRODUCT = 200kHz
= 30µ0V
OVER FULL BANDWIDTH
RMS
= 0.03V TO 1.8V
INPUT RANGE
OUTPUT RANGE = 0.03V TO 2.3V
+
–
(0.3mV≤ V – V ≤ 23mV)
IN IN
–80
–40
40
–120
80
120
0
OUTPUTS SINK CURRENT—NO PULL-DOWN RESISTORS
INPUT OFFSET VOLTAGE (µV)
2078/79 • TA02
1
LT2078/LT2079
W W
U W
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ...................................................... ±22V
Differential Input Voltage ....................................... ±30V
Input Voltage ...............Equal to Positive Supply Voltage
............5V Below Negative Supply Voltage
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
Output Short-Circuit Duration.......................... Indefinite
U
W U
PACKAGE/ORDER INFORMATION
TOP VIEW
ORDER PART
ORDER PART
NUMBER
OUT A
–IN A
+IN A
1
2
3
4
5
6
7
14
13
12
11
10
9
NUMBER
OUT D
–IN D
+IN D
TOP VIEW
A
B
D
C
LT2078ACS8
LT2079AC
LT2079AI
LT2079C
LT2079I
+
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
LT2078AIS8
LT2078CS8
LT2078IS8
+
–
OUT B
–IN B
+IN B
V
V
A
+IN B
–IN B
OUT B
+IN C
–IN C
OUT C
B
–
V
8
PART MARKING
S8 PACKAGE
8-LEAD PLASTIC SO
S PACKAGE
14-LEAD PLASTIC SO
2078A
2078AI 2078I
2078
TJMAX = 150°C, θJA = 190°C/ W
TJMAX = 150°C, θJA = 150°C/ W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted.
LT2078AC/LT2078AI
LT2079AC/LT2079AI
LT2078C/LT2078I
LT2079C/LT2079I
SYMBOL PARAMETER
CONDITIONS (NOTE 1)
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT2078
LT2079
30
35
70
110
40
40
120
150
µV
µV
∆V
∆Time
Long Term Input Offset
Voltage Stability
0.4
0.5
µV/Mo
OS
I
I
Input Offset Current
Input Bias Current
0.05
6
0.25
8
0.05
6
0.35
10
nA
nA
OS
B
e
n
Input Noise Voltage
Input Noise Voltage Density
0.1Hz to 10Hz (Note 2)
0.6
1.2
0.6
µV
P-P
f = 10Hz (Note 2)
29
28
45
37
29
28
nV√Hz
nV√Hz
O
f = 1000Hz (Note 2)
O
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 = 10Hz (Note 2)
O
0.06
0.02
0.10
0.06
0.02
pA√Hz
pA√Hz
O
f = 1000Hz
Input Resistance
Differential Mode
Common Mode
(Note 3)
400
800
6
300
800
6
MΩ
GΩ
Input Voltage Range
3.5
0
3.8
–0.3
3.5
0
3.8
–0.3
V
V
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
V
= 0V to 3.5V
95
110
114
92
98
108
114
dB
dB
CM
V = 2.3V to 12V
100
S
2
LT2078/LT2079
ELECTRICAL CHARACTERISTICS VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C, unless otherwise noted.
LT2078AC/LT2078AI
LT2079AC/LT2079AI
LT2078C/LT2078I
LT2079C/LT2079I
SYMBOL PARAMETER
CONDITIONS (NOTE 1)
V = 0.03V to 4V, No Load
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
A
Large-Signal Voltage Gain
200
150
1000
600
150
120
1000
600
V/mV
V/mV
VOL
O
V = 0.03V to 3.5V, R = 50k
O
L
Maximum Output Voltage
Swing
Output Low, No Load
3.5
0.55
95
6
1.0
130
3.5
0.55
95
6
1.0
130
mV
mV
mV
Output Low, 2k to GND
Output Low, I
= 100µA
SINK
Output High, No Load
Output High, 2k to GND
4.2
3.5
4.4
3.9
4.2
3.5
4.4
3.9
V
V
SR
Slew Rate
A = 1, V = ±2.5V
0.04
0.07
200
38
0.04
0.07
200
39
V/µs
kHz
µA
V
S
GBW
Gain Bandwidth Product
Supply Current per Amplifier
Channel Separation
f ≤ 20kHz
O
I
50
55
S
∆V = 3V, R = 10k, f ≤ 10Hz
110
2.2
110
2.2
dB
IN
L
Minimum Supply Voltage
(Note 4)
2.3
2.3
V
VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, –40°C ≤ TA ≤ 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
LT2079
●
●
70
80
250
280
95
100
370
400
µV
µV
∆V
∆T
Input Offset Voltage Drift
(Note 5)
LT2078
LT2079
●
●
0.4
0.6
1.8
3.0
0.5
0.6
2.5
3.5
µV/°C
µV/°C
OS
I
I
Input Offset Current
●
●
●
●
0.07
7
0.70
10
0.1
7
1.0
12
nA
nA
dB
dB
OS
Input Bias Current
B
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= 0.05V to 3.2V
90
96
106
110
86
92
104
110
CM
V = 3.1V to 12V
S
A
V = 0.05V to 4V, No Load
V = 0.05V to 3.5V, R = 50k
●
●
110
80
600
400
80
60
600
400
V/mV
V/mV
VOL
O
O
L
Maximum Output Voltage
Swing
Output Low, No Load
●
●
4.5
125
8
170
4.5
125
8
170
mV
mV
Output Low, I
= 100µA
SINK
Output High, No Load
Output High, 2k to GND
●
●
3.9
3.0
4.2
3.7
3.9
3.0
4.2
3.7
V
V
I
Supply Current per Amplifier
●
43
60
45
70
µA
S
VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, 0°C ≤ TA ≤ 70°C, unless otherwise noted (Note 6).
LT2078AC/LT2079AC
LT2078C/LT2079C
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
LT2078
LT2079
●
●
50
60
150
180
60
70
240
270
µV
µV
OS
∆V
∆T
Input Offset Voltage Drift
(Note 5)
LT2078
LT2079
●
●
0.4
0.5
1.8
3.0
0.5
0.6
2.5
3.5
µV/°C
µV/°C
OS
I
I
Input Offset Current
●
●
●
●
0.06
6
0.35
9
0.06
6
0.50
11
nA
nA
dB
dB
OS
B
Input Bias Current
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
V
= 0V to 3.4V
92
98
108
112
88
95
106
112
CM
V = 2.6V to 12V
S
3
LT2078/LT2079
VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, 0°C ≤ TA ≤ 70°C, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
LT2078AC/LT2079AC
LT2078C/LT2079C
SYMBOL PARAMETER
CONDITIONS
V = 0.05V to 4V, No Load
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
A
VOL
Large-Signal Voltage Gain
●
●
150
110
750
500
110
80
750
500
V/mV
V/mV
O
V = 0.05V to 3.5V, R = 50k
O
L
Maximum Output Voltage
Swing
Output Low, No Load
●
●
4.0
105
7
150
4.0
105
7
150
mV
mV
Output Low, I
= 100µA
SINK
Output High, No Load
Output High, 2k to GND
●
●
4.1
3.3
4.3
3.8
4.1
3.3
4.3
3.8
V
V
I
Supply Current per Amplifier
●
40
55
42
63
µA
S
VS = ±15V, TA = 25°C, unless otherwise noted.
LT2078AC/LT2078AI
LT2079AC/LT2079AI
LT2078C/LT2078I
LT2079C/LT2079I
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT2078
LT2079
50
60
250
350
70
80
350
450
µV
µV
I
I
Input Offset Current
Input Bias Current
Input Voltage Range
0.05
6
0.25
8
0.05
6
0.35
10
nA
nA
OS
B
13.5
–15.0
13.8
–15.3
13.5
–15.0
13.8
–15.3
V
V
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= 13.5V, –15V
98
114
114
95
98
114
114
dB
dB
CM
V = 5V, 0V to ±18V
100
S
A
VOL
V = ±10V, R = 50k
V = ±10V, R = 2k
1000
400
5000
1100
1000
300
5000
1100
V/mV
V/mV
O
O
L
L
V
OUT
Maximum Output Voltage
Swing
R = 50k
L
±13.0
±11.0
±14.0
±13.2
±13.0
±14.0
V
V
L
R = 2k
±11.0 ±13.2
SR
Slew Rate
0.06
0.10
46
0.06
0.10
47
V/µs
µA
I
Supply Current per Amplifier
65
75
S
VS = ±15V, –40°C ≤ TA ≤ 85°C for I grades, unless otherwise noted.
LT2078AI/LT2079AI
LT2078I/LT2079I
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
LT2078
LT2079
●
●
90
100
430
500
120
130
600
700
µV
µV
OS
∆V
∆T
Input Offset Voltage Drift
(Note 5)
LT2078
LT2079
●
●
0.5
0.6
1.8
3.0
0.6
0.7
2.5
3.8
µV/°C
µV/°C
OS
I
I
Input Offset Current
●
●
●
●
●
●
●
0.07
7
0.70
10
0.1
7
1.0
12
nA
nA
OS
B
Input Bias Current
A
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
V = ±10V, R = 5k
200
92
700
110
110
±13.5
52
150
88
700
110
110
±13.5
54
V/mV
dB
VOL
O
L
CMRR
PSRR
V
= 13V, –14.9V
CM
V = 5V, 0V to ±18V
S
96
92
dB
Maximum Output Voltage Swing R = 5k
±11.0
±11.0
V
L
I
Supply Current per Amplifier
80
95
µA
S
4
LT2078/LT2079
VS = ±15V, 0°C ≤ TA ≤ 70°C, unless otherwise noted (Note 6).
ELECTRICAL CHARACTERISTICS
LT2078AC/LT2079AC
LT2078C/LT2079C
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
LT2078
LT2079
●
●
70
80
330
410
90
100
460
540
µV
µV
OS
∆V
∆T
Input Offset Voltage Drift
(Note 5)
LT2078
LT2079
●
●
0.5
0.6
1.8
3.0
0.6
0.7
2.5
3.8
µV/°C
µV/°C
OS
I
I
Input Offset Current
●
●
●
●
●
●
●
0.06
6
0.35
9
0.06
6
0.50
11
nA
nA
OS
B
Input Bias Current
A
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
V
V
= ±10V, R = 5k
300
95
1200
112
112
250
92
1200
112
112
V/mV
dB
VOL
O
L
CMRR
PSRR
= 13V, –15V
CM
V = 5V, 0V to ±18V
98
95
dB
S
Maximum Output Voltage Swing R = 5k
±11.0 ±13.6
±11.0 ±13.6
V
L
I
Supply Current per Amplifier
49
73
50
85
µA
S
The
●
denotes specifications which apply over the full operating
Note 3: This parameter is guaranteed by design and is not tested.
temperature range.
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 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 = ±2.5V, V = 0V.
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.
S
O
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Distribution of Offset Voltage
Drift with Temperature
Input Bias and Offset Currents vs
Temperature
Input Bias Current vs
Common Mode Voltage
100
50
0
0
–2
25
20
15
10
5
V
= 5V, 0V TO ±15V
V = 5V, 0V
S
S
V
V
= 5V, 0V
CM
S
= 0.1V
I
OS
80 LT2078'S
25 LT2079'S
= 260 OP AMPS
T
= 125°C
A
T
= –55°C
A
–4
T
= 25°C
–6
A
–5
–6
–7
–8
I
B
–10
–12
0
–50
0
25
50
75 100 125
–25
–1
0
1
2
3
4
–2
–1
0
1
2
TEMPERATURE (°C)
COMMON MODE VOLTAGE (V)
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (µV/°C)
LT2078/79 • TPC02
LT2078/79 • TPC03
LT2078/79 • TPC01
5
LT2078/LT2079
TYPICAL PERFORMANCE CHARACTERISTICS
W
U
0.1Hz to 10Hz Noise
0.01Hz to 10Hz Noise
Noise Spectrum
1000
T
S
= 25°C
T
= 25°C
T
V
= 25°C
A
A
A
S
V
= ±2.5V
V
= ±2.5V
= ±2.5V
S
CHANNEL A
CHANNEL B
(AT V = ±15V
S
VOLTAGE NOISE
IS 4% LESS
300
100
CURRENT
NOISE
CURRENT NOISE
IS UNCHANGED)
CHANNEL A
CHANNEL B
0.4µV
VOLTAGE
NOISE
30
10
1/f CORNER
0.7Hz
0.1
1
10
100
1000
0
2
4
6
8
10
0
20
40
60
80
100
FREQUENCY (Hz)
TIME (SEC)
TIME (SEC)
LT2078/79 • TPC06
LT2078/79 • TPC04
LT2078/79 • TPC05
Long Term Stability of Two
Representative Units (LT2078)
10Hz Voltage Noise Distribution
Warm-Up Drift
15
10
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
35
30
25
20
15
10
5
T
= 25°C, V = 5V, 0V
CM
T
= 25°C
V = ±15V
S
A
S
A
T
S
= 25°C
A
V
= 0.1V
V
= ±2.5V
WARM UP DRIFT
AT V = 5V, 0V IS
S
1A
2B
IMMEASURABLY LOW
5
0
–5
–10
–15
LT2079
1B
2A
LT2078
0
1
2
0
3
35
VOLTAGE NOISE DENSITY (nV/√Hz)
40
0
1
2
3
4
5
25
30
TIME (MONTHS)
TIME AFTER POWER-ON (MINUTES)
LT2078/79 • TPC09
LT2078/79 • TPC07
LT2078/79 • TPC08
Output Saturation vs Temperature
vs Sink Current
Output Voltage Swing vs
Load Current
Minimum Supply Voltage
+
1000
100
10
100
0
V
–
V
= 0V
I
= 2mA
SINK
25°C
125°C
–55°C
–0.1V ≤ V ≤ 0.4V
CM
+
V
– 1
– 2
I
= 1mA
SINK
125°C
I
= 100µA
= 10µA
SINK
+
–100
–200
–300
–400
–500
V
I
SINK
70°C
V
S
= 5V, 0V
0°C
25°C
I
= 1µA
–55°C
SINK
–
–
V
V
+ 2
+ 1
NONFUNCTIONAL
125°C
NO LOAD
25°C
R
L
= 5k TO GND
–55°C
–
1
V
–50 –25
0
25
50
75 100 125
2
3
0
1
0.01
0.1
1
10
TEMPERATURE (°C)
SOURCING OR SINKING LOAD CURRENT (mA)
POSITIVE SUPPLY VOLTAGE (V)
LT2078/79 • TPC11
LT2078/79 • TPC11.5
LT2078/79 • TPC10
6
LT2078/LT2079
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Gain, Phase vs Frequency
Voltage Gain vs Load Resistance
Voltage Gain vs Frequency
10M
1M
140
120
100
80
30
V
V
= ±15V
= 5V, 0V
S
S
PHASE
MARGIN
58°
T
= 25°C
A
25°C
100
120
140
160
180
200
–55°C
V
= ±15V
125°C
S
20
±15V
5V, 0V
PHASE
MARGIN
46°
V
S
= 5V, 0V
–55°C
125°C
10
60
25°C
5V, 0V
±15V
40
0
20
0
100k
–10
–20
0.01 0.1
100
1k
10k
100k
1M
100 1k
1
10
10k 100k 1M
10
30
100
1000
300
LOAD RESISTANCE TO GROUND (Ω)
FREQUENCY (kHz)
FREQUENCY (Hz)
LT2078/79 • TPC14
LT2078/79 • TPC13
LTC2078/79 TPC12
Slew Rate, Gain Bandwidth Product
and Phase Margin vs Temperature
Channel Separation vs Frequency
Capacitive Load Handling
0.12
0.10
0.08
0.06
0.04
120
100
80
60
40
20
0
120
100
80
60
40
20
0
T
= 25°C
= 5V, 0V
A
S
SLEW = ±15V
V
75
SLEW = 5V, 0V
= ±15V
65
55
45
φ
M
A
V
= 1
φ
M
= 5V, 0V
A
V
= 5
240 GBW = ±15V
A
= 10
V
220
T
= 25°C
A
S
200
V
V
= ±2.5V
GBW = 5V, 0V
= 3V
IN
P-P
180
f
O
= 20kHz
R
= 10k
L
160
10
100
1000
10000
–50
0
25
50
75 100 125
–25
1
100
1k
10k
100k 1M
10
CAPACITIVE LOAD (pF)
TEMPERATURE (°C)
FREQUENCY (Hz)
LT2078/79 • TPC17
LT2078/79 • TPC15
LT2078/79 • TPC16
Power Supply Rejection Ratio
vs Frequency
Undistorted Output Swing
vs Frequency
Common Mode Rejection Ratio
vs Frequency
120
100
80
60
40
20
0
30
20
10
0
120
100
80
60
40
20
0
V
= ±15V
≥ 100k
T
= 25°C
S
L
A
R
5
4
3
2
1
0
V
= 5V, 0V
≥ 100k
S
L
V
= ±15V
S
R
POSITIVE
V
S
= 5V, 0V
NEGATIVE
SUPPLY
V
= 5V, 0V
SUPPLY
S
L
R
≥ 1k
V
R
= ±15V
S
L
= 30k
T
= 25°C
A
T
= 25°C
LOAD R ,
L
A
S
V
= ±2.5V + 1V SINE WAVE
TO GND
P-P
1k
FREQUENCY (Hz)
100k 1M
0.1
1
10 100
10k
0.01
1
10
100
10
100
1k
10k
100k
1M
FREQUENCY (kHz)
FREQUENCY (Hz)
LT2078/79 • TPC18
LT2078/79 • TPC20
LT2078/79 • TPC19
7
LT2078/LT2079
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Common Mode Range vs
Supply Current vs Temperature
Temperature
Closed-Loop Output Impedance
+
55
50
45
40
35
30
25
V
+
V
V
= 2.5V TO 18V
= 0V TO –18V
–
1k
+
+
–
V
V
V
– 1
– 2
+ 1
A
= 100
V
V
= ±15V
S
100
A
= 10
V
10
1
A
= 1
V
V
= 5V, 0V
S
–
V
0.1
–
V
– 1
–50 –25
10
100
1k
10k
100k
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
0
25
50
75 100 125
FREQUENCY (Hz)
TEMPERATURE (°C)
LT2078/79 • TPC23
LT2078/79 • TPC21
LT2078/79 • TPC22
Small-Signal Transient Response
VS = 5V, 0V
Small-Signal Transient Response
VS = ± 2.5V
Small-Signal Transient Response
VS = ± 15V
0V
0V
0V
AV = 1
L = 15pF
INPUT 50mV TO 150mV
10µs/DIV
AV = 1
L = 15pF
10µs/DIV
AV = 1
CL = 15pF
10µs/DIV
C
C
LT2078/79 • TPC24
LT2078/79 • TPC25
LT2078/79 • TPC26
Large-Signal Transient Response
VS = 5V, 0V
Large-Signal Transient Response
VS = ± 15V
0V
0V
AV = 1
NO LOAD
100µs/DIV
AV = 1, NO LOAD
50µs/DIV
INPUT PULSE 0V TO 3.8V
LT2078/79 • TPC28
LT2078/79 • TPC27
8
LT2078/LT2079
W
W
SI PLIFIED SCHEMATIC
1/2 LT2078, 1/4 LT2079
+
V
5k
11.5k
12.5k
3.6k
1.3k
10k
10k
Q6
2.2k
Q16
5.6k
Q54
1
Q53
2
1
Q14
Q15
Q32
Q5
Q52
Q47
Q37
Q30
Q46
Q29
Q3
–
V
Q24
Q4
1
3
Q40
3k
Q26
Q25
Q41
Q35
+
Q12
4
V
8.6k
C1
50pF
C4
4pF
2.9k
30Ω
OUT
Q11
1
Q44
C5
2.5pF
Q27
Q1
Q21
150k
600Ω
600Ω
–
+
IN
IN
Q31
C3
J1
40pF
Q36
Q18
Q28
Q2
Q22
Q33
Q48
+
Q19
V
Q42
Q50
Q49
Q39
Q9
Q23
Q17
Q10
+
9.1k
V
700k
Q51
Q55
C2
175pF
Q7
Q8
Q45
Q20
10k
Q34
Q43
Q38
4A
5.35k
30Ω
6.2k
1.35k
6.2k
700k
–
V
LT2078/79 • SIMPLIFIED SCHEM
9
LT2078/LT2079
U
W U U
APPLICATIONS INFORMATION
The LT2078/LT2079 devices are fully specified with
V+ = 5V, V– = 0V, VCM = 0.1V. This set of operating
conditions appears to be the most representative for
battery powered micropower circuits. Offset voltage is
internally trimmed to a minimum value at these supply
voltages. When 9V or 3V batteries or ±2.5V dual supplies
are used, bias and offset current changes will be minimal.
Offset voltage changes will be just a few microvolts as
givenbythePSRRandCMRRspecifications.Forexample,
if PSRR = 114dB (=2µV/V), at 9V the offset voltage change
will be 8µV. Similarly, VS = ±2.5V, VCM = 0V is equivalent
to a common mode voltage change of 2.4V or a VOS
change of 7µV if CMRR = 110dB (3µV/V).
As an example, consider the instrumentation amplifier
shown on the front page. When the common mode signal
is low and the output is high, amplifier A has to sink
current. When the common mode signal is high and the
output low, amplifier B has to sink current. The competing
devices require a 12k pull-down resistor at the output of
amplifier A and a 15k at the output of B to handle the
specified signals. (The LT2078 does not need pull-down
resistors.) When the common mode input is high and the
outputishighthesepull-downresistorsdraw300µA(150µA
each), which is excessive for micropower applications.
The instrumentation amplifier is by no means the only
application requiring current sinking capability. In seven
of the nine single supply applications shown in this data
sheet the op amps have to be able to sink current. In two
of the applications the first amplifier has to sink only the
6nA input bias current of thesecond opamp. The compet-
ing devices, however, cannot even sink 6nA without a
pull-down resistor
A full set of specifications is also provided at ±15V supply
voltages for comparison with other devices and for com-
pleteness.
Single Supply Operation
The LT2078/LT2079 is quite tolerant of power supply
bypassing. In some applications requiring faster settling
time the positive supply pin of the LT2078/LT2079 should
be bypassed with a small capacitor (about 0.1µF). The
same is true for the negative supply pin when using split
supplies.
Since the output of the LT2078/LT2079 cannot go exactly
to ground, but can only approach ground to within a few
millivolts, care should be exercised to ensure that the
output is not saturated. For example, a 1mV input signal
will cause the amplifier to set up in its linear region in the
gain 100 configuration shown in Figure 1, but is not
enough to make the amplifier function properly in the
voltage follower mode.
The LT2078/LT2079 are fully specified for single supply
operation, i.e., when the negative supply is 0V. Input
common mode range goes below ground and the output
swings within a few millivolts of ground while sinking
current. All competing micropower op amps either cannot
swing to within 600mV of ground (OP-20, OP-220, OP-
420) or need a pull-down resistor connected to the output
to swing to ground (OP-90, OP-290, OP-490, HA5141/42/
44). This difference is critical because in many applica-
tions these competing devices cannot be operated as
micropoweropampsandswingtogroundsimultaneously.
Single supply operation can also create difficulties at the
input. Thedrivingsignalcanfallbelow0V—inadvertently
or on a transient basis. If the input is more than a few
hundred millivolts below ground, two distinct problems
can occur on previous single supply designs, such as the
LM124, LM158, OP-20, OP-21, OP-220, OP-221, OP-420
(1 and 2), OP-90/290/490 (2 only):
5V
5V
R
99R
–
–
OUTPUT
SATURATION
100mV
≈ 3.5mV
1mV
+
1mV
+
LT2078/79 • F02a
LT2078/79 • F02b
Figure 1a. Gain 100 Amplifier
Figure 1b. Voltage Follower
10
LT2078/LT2079
U
W U U
APPLICATIONS INFORMATION
1. Whentheinputismorethanadiodedropbelowground,
unlimited current will flow from the substrate (V–
terminal) to the input. This can destroy the unit. On the
LT2078/LT2079, resistors in series with the input protect
the devices even when the input is 5V below ground.
rejection of the LT2078/LT2079 is very good, typically
108dB. Therefore, as long as the input operates in the
normal common mode range, there will be very little
common mode induced distortion. If the op amp is oper-
ating inverting there is no common mode induced distor-
tion. Crossover distortion will increase as the output load
resistancedecreases.ForthelowestdistortiontheLT2078/
LT2079 should be operated with the output always sourc-
ing current, this is usually accomplished by putting a
resistor from the output to V–. In an inverting configura-
tion with no load, the output will source and sink current
through the feedback resistor. High value feedback resis-
tors will reduce crossover distortion and maintain
micropower operation.
2. When the input is more than 400mV below ground (at
25°C), the input stage saturates and phase reversal
occurs at the output. This can cause lockup in servo
systems. Due to a unique phase reversal protection cir-
cuitry, the LT2078/LT2079 output does not reverse, as
illustrated in Figure 2, even when the inputs are at –1V.
Distortion
There are two main contributors of distortion in op amps:
distortion caused by nonlinear common mode rejection
and output crossover distortion as the output transitions
from sourcing to sinking current. The common mode
Matching Specifications
In many applications the performance of a system de-
pends on the matching between two op amps, rather than
Table 1
LT2078AC/LT2079AC/LT2078AI/LT2079AI
LT2078C/LT2079C/LT2078I/LT2079I
PARAMETER
Match, ∆V
50% YIELD
98% YIELD
50% YIELD
98% YIELD
190
UNITS
µV
µV
µV/°C
nA
V
OS
LT2078
LT2079
30
40
0.5
6
110
150
1.2
8
50
50
0.6
6
OS
250
1.8
10
Temperature Coefficient ∆V
Average Noninverting I
OS
B
Match of Noninverting I
CMRR Match
PSRR Match
0.12
120
117
0.4
100
105
0.15
117
117
0.5
97
102
nA
dB
dB
B
4V
2V
4V
2V
4V
2V
0V
0V
0V
6VP-P INPUT
–1V TO 5V
1ms/DIV
1ms/DIV
OP-90 EXHIBITS OUTPUT PHASE REVERSAL
1ms/DIV
LT2078/LT2079 NO PHASE REVERSAL
LT2078/79 • F01a
LT2078/79 • F01b
LT2078/79 • F01C
Figure 2. Voltage Follower with Input Exceeding the Negative Common Mode Range (VS = 5V, 0V)
11
LT2078/LT2079
U
W U U
APPLICATIONS INFORMATION
the individual characteristics of the two devices, the two
and three op amp instrumentation amplifier configura-
tions shown in this data sheet are examples. Matching
characteristicsarenot100%testedontheLT2078/LT2079.
expected matching performance at VS = 5V, 0V between
the two sides of the LT2078, and between amplifiers A and
D, and between amplifiers B and C of the LT2079.
Comparator Applications
Some specifications are guaranteed by definition. For
example, 70µV maximum offset voltage implies that mis-
match cannot be more than 140µV. 95dB (= 17.5µV/V)
CMRR means that worst-case CMRR match is 89dB
(= 35µV/V). However, Table 1 can be used to estimate the
The single supply operation of the LT2078/LT2079 and its
ability to swing close to ground while sinking current
lends itself to use as a precision comparator with TTL
compatible output.
4
2
4
2
0
0
0
100
0
–100
VS = 5V, 0V
200µs/DIV
VS = 5V, 0V
200µs/DIV
LT2078/79 • F03
LT2078/79 • F04
Figure 3. Comparator Rise Response
Time to 10mV, 5mV, 2mV Overdrives
Figure 4. Comparator Fall Response
Time to 10mV, 5mV, 2mV Overdrives
U
TYPICAL APPLICATIONS
Micropower, 10ppm/°C, ±5V Reference
Gain of 10 Difference Amplifier
2M
10M
9V
LT1034BC-1.2
220k
3V
5V
1M
OUT
1M
–IN
+IN
–
120k
8
OUTPUT
3
2
1/2 LT2078
0.0035V TO 2.4V
1M
+
1M
6
5
1
LT2078/79 • TA04
+
–
1/2 LT2078
7
BANDWIDTH
OUTPUT OFFSET
OUTPUT NOISE = µV80 (0.1Hz TO 10Hz)
=
=
20kHz
0.7mV
P-P
1/2 LT2078
–5.000V
–
OUT
510k
4
10M
+
LT2078/79 • TA03
–9V
µ2V60 OVER FULL
RMS
510k
1%
BANDWIDTH
SUPPLY CURRENT = 9V BATTERY = 115µA
–9V BATTERY = 8µ5A
OUTPUT NOISE = 36µV , 0.1Hz TO 10Hz
THE USEFULNESS OF DIFFERENCE AMPLIFIERS IS LIMITED BY THE FACT THAT
THE INPUT RESISTANCE IS EQUAL TO THE SOURCE RESISTANCE. THE PICOAMPERE
OFFSET CURRENT AND LOW CURRENT NOISE OF THE LT2078 ALLOWS THE USE OF
1M SOURCE RESISTORS WITHOUT DEGRADATION IN PERFORMANCE. IN ADDITION,
WITH MEGOHM RESISTORS MICROPOWER OPERATION CAN BE MAINTAINED
20k
160k
1%
P-P
THE LT2078 CONTRIBUTES LESS THAN 3% OF THE TOTAL OUTPUT NOISE AND
DRIFT WITH TIME AND TEMPERATURE. THE ACCURACY OF THE –5V OUTPUT
DEPENDS ON THE MATCHING OF THE TWO 1M RESISTORS
12
LT2078/LT2079
U
TYPICAL APPLICATIONS
Picoampere Input Current, Triple Op Amp
85V, –100V Common Mode Range
Instrumentation Amplifier (AV = 10)
Instrumentation Amplifier with Bias Current Cancellation
3
R2
–IN
+
1M
1M
1
1/4 LT2079
9V
10M
2
R1
1M
–
10M
10M
8
2
3
+IN
–IN
–
R3
100k
100k
1
6
9.1M
2R
–
R
1/2 LT2078
G
200k
20M
7
OUTPUT
+
1/2 LT2078
8V TO –9V
9
4
5
–
LT2078/79 • TA06
+
R1
1M
6
5
8
OUTPUT
4mV TO 8.2V
–9V
1M
–
1/4 LT2079
7
10
LT2078/79 • TA05
1/4 LT2079
+
BANDWIDTH
OUTPUT OFFSET
OUTPUT NOISE
=
=
=
=
2kHz
8mV
P-P
R2
1M
+IN
+
0.8mV(0.1Hz TO 10Hz)
R3
9.1M
1.4mV OVER FULL BANDWIDTH
RMS
(DOMINATED BY RESISTOR NOISE)
10M
9V
4
R
10M
INPUT RESISTANCE
=
12
13
+
2R1 R3
14
2R
20M
GAIN = 1 +
= 100 FOR VALUES SHOWN
1/4 LT2079
(
)
R
R2
G
–
INPUT BIAS CURRENT TYPICALLY < 150pA
11
INPUT RESISTANCE = 3R = 30M FOR VALUES SHOWN
NEGATIVE COMMON MODE LIMIT = (I )(2R) + 20mV ≈ 140mV
B
GAIN BANDWIDTH PRODUCT = 1.8MHz
Half-Wave Rectifier
Absolute Value Circuit (Full-Wave Rectifier)
2M
200k
3.5V
0V
5V
3V
2M
200k
8
2
3
INPUT
–
INPUT
–
1
5
6
OUTPUT
1/2 LT2078
+
1/2 LT2078
1M
7
1N4148
+
3.5V
OUTPUT
+
1/2 LT2078
4
V
= 6mV
OMIN
–
NO DISTORTION TO 100Hz
1.8V
–3.5V
1.8V
0V
LT2078/79 • TA08
V
= 4mV
OMIN
–1.8V
LT2078/79 • TA07
NO DISTORTION TO 100Hz
Programmable Gain Amplifier (Single Supply)
1.11k
10k
100k
1M
3V TO 18V
3V TO 18V
11
4
2
3
–
1
1
1/4 LT2079
13
12
–
A
+
6
5
14
2
4
9
OUT
–
1/4 LT2079
11
7
B
3
8
1/4 LT2079
+
LT2078/79 • TA09
9
+
–
C
7
8
CD4016B
PIN 5
LOW
1/4 LT2079
GAIN
1000
100
10
PIN 13
HIGH
LOW
PIN 6
LOW
LOW
HIGH
CD4016B
10
IN
+
HIGH
LOW
13
5
6
ERROR DUE TO SWITCH ON RESISTANCE,
LEAKAGE CURRENT, NOISE AND TRANSIENTS
ARE ELIMINATED
LOW
13
LT2078/LT2079
TYPICAL APPLICATIONS
U
Single Supply, Micropower, Second Order Lowpass Filter with 60Hz Notch
0.02µF
6
5
5V
8
27.6k
0.1%
27.6k
0.1%
–
OUTPUT
TYPICAL OFFSET
≈ 600µV
3
7
2.64M
0.1%
2.64M
0.1%
IN
+
1/2 LT2078
1
0.01µF
1/2 LT2078
+
2
2000pF
0.5%
–
4
5.1M
1%
120k
5%
1.35M
0.1%
100pF
1000pF
0.5%
1000pF
0.5%
f
= 40Hz
C
LT2078/79 • TA10
Q = 30
Micropower Multiplier/Divider
505k
0.1%
505k
0.1%
Z INPUT
(5mV TO 50V)
Y INPUT
(5mV TO 50V)
9V
4
220pF
220pF
Q1
Q3
–
–
13
6
5
Q1,Q2, Q3, Q4 = MAT-04
30k
5%
TYPICAL LINEARITY = 0.01% OF FULL-SCALE OUTPUT
7
14
(X)(Y)
(Z)
1/4 LT2079
1/4 LT2079
OUTPUT =
, POSITIVE INPUTS ONLY
30k
5%
+
+
12
10k
GAIN
X + Y+ Z + OUT
500k
OUT
499k
0.5%
11
NEGATIVE SUPPLY CURRENT = 165µA +
POSITIVE SUPPLY CURRENT = 165µA +
–1.5V TO –9V
505k
0.1%
500k
X INPUT
(5mV TO 50V)
BANDWIDTH (< 3V SIGNAL): X AND Y INPUTS = 10kHz
P-P
–
9
Z INPUT = 4kHz
8
OUTPUT
(5mV TO 8V)
220pF
1/4 LT2079
+
–
2
3
Q2
Q4
10
1
1/4 LT2079
lt2078/79 • TA11
+
30k
5%
Micropower Dead Zone Generator
Q4
V
SET
DEAD ZONE
CONTROL INPUT
0.4V TO 5V
1M*
1M**
1M**
510k
–
2
3
Q2
Q3
INPUT
1
470k
1/4 LT2079
+
1M*
1M**
GAIN
200k
Q1
2N4393
–
9
1M**
–
8
13
1/4 LT2079
+
1N914
10
14
1M
V
OUT
1/4 LT2079
510k
510k
12
+
LT2078/79 • TA12
9V
1N914
1M
1M
680k
Q6
V
V
SET
OUT
2N4393
4
–
6
5
1000pF
7
V
IN
Q5
1/4 LT2079
BIPOLAR SYMMETRY IS EXCELLENT
BECAUSE ONE DEVICE, Q2,
SETS BOTH LIMITS
SUPPLY CURRENT ≈ 240µA
BANDWIDTH = 150kHz
+
V
SET
11
1% FILM
*
**
RATIO MATCH 0.05%
Q2, Q3, Q4, Q5 CA3096 TRANSISTOR ARRAY
–9V
14
LT2078/LT2079
U
TYPICAL APPLICATIONS
Lead-Acid Low-Battery Detector with System Shutdown
BATTERY
OUTPUT
2M
1%
2M
1%
910k
5%
3
12V
+
1
LO = BATTERY LOW
(IF V < 10.90V)
1/2 LT2078
S
2
–
8
5
6
+
LO = SYSTEM SHUTDOWN
(IF V < 10.05V)
7
1/2 LT2078
S
255k
1%
280k
1%
–
4
LT1004-1.2
LT2078/79 • TA13
TOTAL SUPPLY CURRENT = 105µA
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
0.189 – 0.197*
(4.801 – 5.004)
(LTC DWG # 05-08-1610)
7
5
8
6
0.228 – 0.244
(5.791 – 6.197)
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.150 – 0.157**
(3.810 – 3.988)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
1
2
3
4
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
SO8 0695
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 – 0.344*
(8.560 – 8.738)
14
13
12
11
10
9
8
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0° – 8° TYP
0.150 – 0.157**
(3.810 – 3.988)
0.050
(1.270)
TYP
0.014 – 0.019
(0.355 – 0.483)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
S14 0695
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
1
2
3
4
5
6
7
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
15
LT2078/LT2079
TYPICAL APPLICATION
U
Platinum RTD Signal Conditioner with Curvature Correction
3V (LITHIUM)
13k*
1µF
12.3k*
5k
220°C
TRIM
8
LT1004-1.2
3
2
+
10k*
1
43.2k**
1/2 LT2078
4
50k
–
1k**
1k**
1k**
5°C
TRIM
–
6
5
0.02V TO 2.2V
=
7
OUT
1/2 LT2078
+
2°C TO 220°C ±0.1°C
R
P
= ROSEMOUNT 118MF
** = TRW MAR-6 0.1%
* = 1% METAL FILM
R
P
1k AT
1.21M*
(SELECT AT 110°C)
1µF
0°C
LT2078/79 • TA14
RELATED PARTS
PART NUMBER DESCRIPTION
COMMENTS
LT1178/LT1179 Dual/Quad 17µA Max, Single Supply Precision Op Amps
70µV V Max and 2.5µV/°C Drift Max, 85kHz GBW, 0.04V/µs Slew
Rate, Input/Output Common Mode Includes Ground
OS
LT1211/LT1212 14MHz, 7V/µs Single Supply Dual and Quad Precision Op Amps 275µV V Max, 6µV/°C Drift Max Input Voltage Range Includes Ground
OS
LT1490/LT1491 Dual/ Quad Micropower Rail-to-Rail Input and Output Op Amps Single Supply Input Range: –0.4V to 44V, Micropower 50µA Amplifier,
Rail-to-Rail Input and Output, 200kHz GBW
LT2178/LT2179 Dual/Quad 17µA Max, Single Supply Precision Op Amps
SO-8 and 14-Lead Standard Pinout, 70µV VOS Max, 85kHz GBW
LT/GP 1096 7K • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
LINEAR TECHNOLOGY CORPORATION 1996
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