LT1077S8#TR [Linear]
LT1077 - Micropower, Single Supply, Precision Op Amp; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C;
| 型号： | LT1077S8#TR |
| 厂家： | 
Linear |
| 描述： | LT1077 - Micropower, Single Supply, Precision Op Amp; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C 放大器 光电二极管 |
| 文件： | 总16页 (文件大小：293K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1077
Micropower,SingleSupply,
Precision Op Amp
U
FEATURES
DESCRIPTIO
The LT®1077 is a micropower precision operational
amplifier optimized for single supply operation at 5V. In
addition, ±15V specifications are provided.
■
60µA Max Supply Current
■
40µV Max Offset Voltage
■
350pA Max Offset Current
■
0.5µVP-P 0.1Hz to 10Hz Voltage Noise
Micropower performance of competing devices is
achieved at the expense of seriously degrading precision,
noise, speed, and output drive specifications. The LT1077
reduces supply current without sacrificing other
parameters. The offset voltage achieved is the lowest
of any micropower op amp. Offset current, voltage
and current noise, slew rate and gain-bandwidth product
arealltwototen timesbetterthanonpreviousmicropower
op amps.
■
2.5pAP-P 0.1Hz to 10Hz Current Noise
■
O.4µV/°C Offset Voltage Drift
250kHz Gain-Bandwidth Product
0.12V/µs Slew Rate
Single Supply Operation
■
■
■
Input Voltage Range Includes Ground
Output Swings to Ground while Sinking Current
No Pull-Down Resistors are Needed
The 1/f corner of the voltage noise spectrum is at 0.7Hz.
This results in low frequency (0.1Hz to 10Hz) noise
performance which can only be found on devices with an
order of magnitude higher supply current.
■
Output Sources and Sinks 5mA Load Current
U
APPLICATIO S
The LT1077 is completely plug-in compatible (including
nulling) with all industry standard precision op amps.
Thus, it can replace these precision op amps in many
applications without sacrificing performance, yet with
significant power savings.
■
Replaces OP-07, OP-77, AD707, LT1001, LT1O12
at 10 to 60 Times Lower Power
■
Battery or Solar Powered Systems
4mA to 2OmA Current Loops
Two Terminal Current Source
Megaohm Source Resistance Difference Amplifier
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
■
■
The LT1077 can be operated from one lithium cell or two
Ni-Cad batteries. The input range goes below ground. The
all-NPN output stage swings to ground while sinking
current—no pull-down resistors are needed.
For dual and quad op amps with similar specifications
please see the LT1078/LT1079 datasheet.
U
Distribution of Input Offset Voltage
TYPICAL APPLICATIO
35
VS = 5V, 0V
Self Buffered Micropower Reference
TA = 25°C
30
25
3.6V TO 9V
7
1072 UNITS
TESTED IN
H, J8, N8
2
3
–
OUTPUT
1.230V
±1.2% MAX
PACKAGES
20
15
10
5
6
LT1077
4
+
SUPPLY CURRENT = 60µA MAX
SOURCES UP TO 10mA
LOAD REGULATION = 30µV/mA
TEMPERATURE DRIFT = 12ppm/°C
750k
LT1034
1.2V
0.1µF
LT1077 • TA01
0
–20 –10
0
30 40
–40 –30
10 20
LT1077 • TA02
INPUT OFFSET VOLTAGE (µV)
1077fa
1
LT1077
W W U W
ABSOLUTE AXI U RATI GS (Note 1)
Operating Temperature Range
Supply Voltage ...................................................... ±22V
Differential Input Voltage ....................................... ±30V
Input Voltage ...............Equal to Positive Supply Voltage
Input Voltage ............5V Below Negative Supply Voltage
Output Short-Circuit Duration.......................... Indefinite
LT1077AM/LT1077M (OBSOLETE).... –55°C to 125°C
LT1077AI/LT1077I.............................. –40°C to 85°C
LT1077AC/LT1077C/LT1077S8 ............... 0°C to 70°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
U W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V
TRIM
OS
TOP VIEW
TOP VIEW
8
+
V
7
V
OS
TRIM
1
3
V
OS
TRIM
–IN
1
2
3
4
V
V
TRIM
8
V
OS
TRIM
–IN
1
2
3
4
8
7
6
5
V
V
TRIM
OS
+
OS
+
A
B
+
7
6
5
–IN
2
6
OUT
+
–
–
+IN
OUT
NC
+IN
OUT
NC
5
NC
+IN
–
–
V
4
V
–
V
H PACKAGE
8-LEAD TO-5 METAL CAN
= 150°C, θ = 150°C/W, θ = 45°C/W
J8 PACKAGE
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD CERDIP
8-LEAD PLASTIC SO
T
T
= 150°C, θ = 100°C/W
T
= 100°C, θ = 130°C/W
T
= 150°C, θ = 190°C/W
JMAX
JA JC
JMAX
JA
JMAX
JA
JMAX
JA
ORDER PART NUMBER
ORDER PART NUMBER
ORDER PART NUMBER
S8 PART MARKING
LT1077AMH
LT1077MH
LT1077ACH
LT1077CH
LT1077AMJ8
LT1077MJ8
LT1077ACJ8
LT1077CJ8
LT1077S8
1077
1077I
LT1077IS8
LT1077AIN8
LT1077IN8
LT1077ACN8
LT1077CN8
OBSOLETE PACKAGE
Consider the N8 or S8 Package for Alternate Source
LT1077 • POI01
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C unless noted.
LT1077AM/AI/AC
LT1077M/I/C/S8
TYP
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
MAX
UNITS
V
OS
Input Offset Voltage
9
40
10
12
60
150
µV
µV
LT1077S8
∆V
∆Time
Long Term Input Offset
Voltage Stability
0.4
0.4
µV/Mo
OS
I
I
Input Offset Current
Input Bias Current
0.06
7
0.35
9
0.06
7
0.45
11
nA
nA
OS
B
e
Input Noise Voltage
Input Noise Voltage Density
0.1Hz to 10Hz (Note3)
0.5
1.1
0.5
µV
P-P
n
f = 10Hz (Note 3)
28
27
43
35
28
27
nV/√Hz
nV/√Hz
O
f = 1000Hz (Note3)
O
i
Input Noise Current
0.1Hz to 10Hz (Note3)
2.5
4.5
2.5
pA
P-P
n
1077fa
2
LT1077
ELECTRICAL CHARACTERISTICS
VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C unless noted.
LT1077AM/AI/AC
LT1077M/I/C/S8
TYP
SYMBOL
PARAMETER
CONDITIONS
f = 10Hz (Note 3)
f = 1000Hz
O
MIN
TYP
MAX
MIN
MAX
UNITS
Input Noise Current Density
0.065
0.02
0.11
0.065
0.02
pA/√Hz
pA/√Hz
O
Input Resistance
Differential Mode
Common Mode
(Note 4)
350
700
6
270
700
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
Large-Signal Voltage Gain
V
= 0V to 3.5V
97
106
118
94
105
117
dB
dB
CM
V = 2.3V to 12V
102
100
S
A
VOL
V = 0.03V to 4V, No Load
V = 0.03V to 3.5V, R = 50k
300
250
1000
1000
240
200
1000
1000
V/mV
V/mV
O
O
L
Maximum Output Voltage
Swing
Output Low, No Load
Output Low, 2k to GND
3.5
0.7
90
4.4
3.9
6
1.1
130
3.5
0.7
90
4.4
3.9
6
1.1
130
mV
mV
mV
V
Output Low, l = 100µA
SINK
Output High, No Load
Output High, 2k to GND
4.2
3.5
4.2
3.5
V
SR
Slew Rate
(Note 2)
0.05
0.08
230
48
0.05
0.08
230
48
V/µs
kHz
µA
GBW
Gain Bandwidth Product
Supply Current
f ≤ 20kHz
O
I
60
68
S
+
Offset Adjustment Range
Minimum Supply Voltage
R
= 10k, Wiper to V
±500
±900
2.2
±500
±900
2.2
µV
pot
(Note 5)
2.3
2.3
V
The ■ denotes the specifications which apply over the temperature range of –55°C ≤ TA ≤ 125°C for AM/M grades,
–40°C ≤ TA ≤ 85°C for AI/I grades. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V unless otherwise noted.
LT1077AM/AI
LT1077M/I
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
µV
V
OS
Input Offset Voltage
■
■
■
■
■
■
■
50
200
60
260
2.5
∆V /∆T
OS
Input Offset Voltage Drift
Input Offset Current
LT1077IS8 (Note 6)
1
µV/°C
nA
I
I
0.08
8
0.60
11
0.08
8
0.80
13
OS
B
Input Bias Current
nA
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= 0.05V to 3.2V
92
98
104
114
600
88
94
103
113
600
dB
CM
V = 3.1V to 12V
S
dB
A
VOL
V = 0.05V to 3.5V, R = 50k
O
120
100
V/mV
L
Maximum Output Voltage
Swing
Output Low, No Load
■
■
■
■
4.5
120
4.2
3.7
8
170
4.5
120
4.2
3.7
8
170
mV
mV
V
Output Low, I
= 100µA
SINK
Output High, No Load
Output High, 2k to GND
3.9
3
3.9
3
V
I
Supply Current
■
54
80
54
90
µA
S
1077fa
3
LT1077
ELECTRICAL CHARACTERISTICS
The ■ denotes the specifications which apply over the temperature range
of 0°C ≤ TA ≤ 70°C otherwise, specifications are at TA = 25°C. VS = 5V, 0V, VCM = 0.1V, VO = 1.4V unless noted.
LT1077AC
TYP
LT1077C/S8
SYMBOL
PARAMETER
CONDITIONS
MIN
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
■
■
30
110
35
40
150
280
µV
µV
LT1077S8
∆V /∆T
OS
Input Offset Voltage Drift
(Note 6)
LT1077S8 (Note 6)
■
0.4
1.6
0.5
0.7
2.0
3.0
µV/°C
µV/°C
I
I
Input Offset Current
■
■
■
■
■
0.07
7
0.45
10
0.07
7
0.60
12
nA
nA
OS
B
Input Bias Current
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
= 0V to 3.4V
94
105
116
800
90
97
104
115
800
dB
CM
V = 2.6V to 12V
100
180
dB
S
A
V = 0.05V to 3.5V, R = 50k
150
V/mV
VOL
O
L
Maximum Output Voltage Swing Output Low, No Load
Output Low, I = 100µA
■
■
■
■
4.0
100
4.3
3.8
7
150
4.0
100
4.3
3.8
7
150
mV
mV
V
SINK
Output High, No Load
Output High, 2k to GND
4.1
3.3
4.1
3.3
V
I
Supply Current
■
52
70
52
80
µA
S
VS = ±15V, TA = 25°C unless noted.
LT1077AM/AI/AC
LT1077M/I/C/S8
TYP
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
MAX
UNITS
V
OS
Input Offset Voltage
20
150
25
30
200
300
µV
µV
LT1077S8
I
I
Input Offset Current
Input Bias Current
Input Voltage Range
0.06
7
0.35
9
0.06
7
0.45
11
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 to –15V
100
106
109
122
97
108
dB
dB
CM
V = 5V, 0V to ±18V
103
120
S
A
VOL
V = ±10V, R = 50k
V = ±10V, R = 2k
1000
400
8000
1500
800
300
8000
1500
V/mV
V/mV
O
L
O
L
V
OUT
Maximum Output Voltage Swing R = 50k
±13.0
±11.0
±14.0
±13.2
±13.0
±11.0
±14.0
±13.2
V
V
L
R = 2k
L
SR
Slew Rate
0.07
0.12
56
0.07
0.12
56
V/µs
µA
I
Supply Current
75
85
S
1077fa
4
LT1077
ELECTRICAL CHARACTERISTICS
The ■ denotes the specifications which apply over the temperature range of
–55°C ≤ TA ≤ 125°C for AM/M grades, –40°C ≤ TA ≤ 85°C for AI/I grades. VS = ±15V unless otherwise noted.
LT1077AM/AI
LT1077M/I
TYP
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
MAX
450
3
UNITS
µV
V
OS
Input Offset Voltage
■
■
■
■
■
■
■
■
■
60
330
75
1.1
∆V /∆T
OS
Input Offset Voltage Drift
Input Offset Current
LT1077IS8 (Note 6)
µV/°C
nA
I
I
0.08
8
0.60
11
0.08
8
0.80
13
OS
B
Input Bias Current
nA
A
VOL
Large-Signal Voltage Gain
Common Mode Rejection Ratio
Power Supply Rejection Ratio
V = ±10V, R = 5k
300
94
1000
107
118
±13.5
60
250
90
1000
106
116
±13.5
60
V/mV
dB
O
L
CMRR
PSRR
V
= 13V, –14.9V
CM
V = 5V, 0V to ±18V
S
100
±11
97
dB
Maximum Output Voltage Swing R = 5k
±11
V
L
I
Supply Current
95
105
µA
S
The ■ denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C.
VS = ±15V unless otherwise noted.
LT1077AC
LT1077C/S8
TYP
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
MAX
UNITS
V
OS
Input Offset Voltage
■
■
40
230
50
65
320
450
µV
µV
LT1077S8
∆V /∆T
OS
Input Offset Voltage Drift
(Note 6)
LT1077S8 (Note 6)
■
■
0.4
1.8
0.5
0.8
2.5
3.5
µV/°C
µV/°C
I
I
Input Offset Current
■
■
■
■
■
■
■
0.07
7
0.45
10
0.07
7
0.60
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
500
97
2000
108
120
±13.6
59
400
94
2000
107
118
±13.6
59
V/mV
dB
VOL
O
L
CMRR
PSRR
V
= 13V, –15V
CM
V = 5V, 0V to ±18V
S
103
±11
100
±11
dB
Maximum Output Voltage Swing R = 5k
V
L
I
Supply Current
85
95
µA
S
Note 1: Absolute Maximum Ratings are those values beyond which the life
Note 4: This parameter is guaranteed by design and is not tested.
of a device may be impared.
Note 2: Slew rate at 5V, 0V is guaranteed by inference from the slew rate
measurement at ±15V.
Note 5: 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 3: This parameter is tested on a sample basis only. All noise
Note 6: This parameter is not 100% tested.
parameters are tested with V = ± 2.5V, V = 0V.
S
O
1077fa
5
LT1077
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias and Offset Currents
vs Temperature
Input Bias Currents vs
Common Mode Voltage
Supply Current vs Temperature
–1
–3
V
= 5V, 0V
V
= 5V, 0V TO ±15V
S
S
100
75
60
50
40
I
OS
V
V
= ±15V
S
50
–5
–7
T
= 25°C
A
T
= 55°C
A
= 5V, 0V
S
T
= 125°C
A
–6
–7
–8
–9
–11
–13
I
B
–1
0
1
2
3
4
50
TEMPERATURE (˚C)
100 125
–50 –25
0
25
75
–50
0
25
50
75 100 125
–25
COMMON MODE VOLTAGE (V)
TEMPERATURE (°C)
LT1077 • TPC03
LT1077 • TPC01
LT1077 • TPC02
0.01Hz to 10Hz Noise
0.1Hz to 10Hz Noise
Noise Spectrum
1000
V
= ± 2.5V
= 2.5°C
V
= ± 2.5V
= 2.5°C
S
A
S
A
V
= ±2.5V
A
S
S
T
T
T
= 25°C
(AT V = ±15V
VOLTAGE NOISE
IS 4% LESS
CURRENT NOISE
IS UNCHANGED
300
100
CURRENT
NOISE
VOLTAGE
NOISE
30
10
1/f CORNER
0.7Hz
0
2
4
6
8
10
0
20
40
60
80
100
0.1
1
10
100
1000
FREQUENCY (Hz)
TIME (SECONDS)
TIME (SECONDS)
LT1077 • TPC06
LT1077 • TPC04
LT1077 • TPC05
Distribution of Offset Voltage Drift
with Temperature (In All Packages)
Distribution of Input Offset Voltage
in Small Outline (S8) Package
10Hz Voltage Noise Distribution
35
30
25
20
15
10
5
70
60
V
V
= 5V, 0V
= 0.1V
456 UNITS
TESTED
V
A
= 5V, 0V
S
S
CM
V
= ± 2.5V
= 2.5°C
S
A
400 UNITS TESTED
(100 IN EACH PACKAGE)
T
= 25°C
T
30
50
20
10
40
30
20
10
0
0
0
–1.0
0
1.0
2.0
35
VOLTAGE NOISE DENSITY (nV/√Hz)
40
–2.0
150
90 120
INPUT OFFSET VOLTAGE (µV)
25
30
–150
–60
60
–120 –90
–30
0
30
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (nV/°C)
LT1077 • TPC08
LT1077 • TPC07
LT1077 • TPC09
1077fa
6
LT1077
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Voltage Gain vs Frequency
Gain, Phase vs Frequency
Capacitive Load Handling
30
20
10
0
140
120
100
80
120
100
80
60
40
20
0
PHASE
MARGIN
66°
V
T
= 5V, 0V
= 25°C
T
= 25°C
S
A
A
100
120
140
160
180
PHASE
V
= ±15V
S
5V, 0V
PHASE
±15V
A
V
= 1
MARGIN
54°
GAIN
60
V
= 5V, 0V
S
±15V
40
A
= 10
5V, 0V
V
A
= 5
V
200
20
T
= 25°C
= 20pF
A
L
0
C
–10
–20
100 1k
10
FREQUENCY (Hz)
0.01 0.1
1
10k 100k 1M
10k
30k
100k
FREQUENCY (Hz)
300k
1M
10
100
1000
10,000
CAPACITIVE LOAD (pF)
LT1077 • TPC10
LT1077 • TPC11
LT1077 • TPC12
Slew Rate, Gain Bandwidth
Product and Phase Margin vs
Temperature
Large-Signal Transient
Response VS = 5V, 0V
Large-Signal Transient
Response VS = ±15V
0.14
SLEW ±15V
f
O
= 20kHz
0.12
0.10
0.08
0.06
SLEW 5V, 0V
80
70
60
50
40
0V
φ
M
±15V
0V
φ
M
±5V, 0V
260
240
220
200
180
GBW ±15V
GBW 5V, 0V
50µs/DIV
AV = 1
AV = 1
NO LOAD
INPUT PULSE 0V TO 3.8V
NO LOAD
–50
0
25
50
75 100 125
–25
TEMPERATURE (°C)
LT1077 • TPC13
Small-Signal Transient Response
VS = 5V, 0V
Small-Signal Transient Response
VS = ± 2.5V
Small-Signal Transient Response
VS = ±15V
0V
0.1V
0V
AV = 1
L = 15pF
INPUT 50mV TO 150mV
10µs/DIV
AV = 1
CL = 15pF
10µs/DIV
A
C
V = 1
L = 15pF
10µs/DIV
C
1077fa
7
LT1077
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Minimum Supply Voltage
Warm-Up Drift
Voltage Gain vs Load Resistance
0.8
10M
1M
100
0
–
V
T
= ±15V
= 25°C
1. 25°C
2. –55°C
3. 125°C
V
= 0V
70°C
S
A
1
V = ±15V
S
–0.1 ≤ V ≤ 0.4V
CM
WARM UP DRIFT
2
3
0.6 AT V = 5V, 0V IS
125°C
S
IMMEASURABLY LOW
–100
–200
4
5
6
0.4
0°C –55°C
NON
FUNCTIONAL
25°C
–300
–400
–500
0.2
0
4. –55°C
5. 25°C
6. 125°C
V
S
= 5V, 0V
100k
1
2
0
3
2
3
0
1
100
1k
10k
100k
1M
TIME AFTER POWER ON (MINUTES)
LOAD RESISTANCE TO GROUND (Ω)
POSITIVE SUPPLY VOLTAGE (V)
LT1077 • TPC21
LT1077 • TPC20
LT1077 • TPC19
Output Saturation vs Temperature
vs Sink Current
Output Voltage Swing vs
Load Current
Short-Circuit Current vs
Time
+
V
40
30
20
10
1000
100
25°C
V
= 5V, 0V
125°C
S
I
I
= 2mA
= 1mA
SINK
SINK
+
+
T
T
= 25°C, V = 5V, 0V
S
A
V
V
– 1
– 2
–55°C
= 25°C, V = ±15V
A
S
I
= 100µA
= 10µA
SINK
I
SINK
T
T
= 125°C, V = 5V, 0V
S
A
0
= 125°C, V = ±15V
A
S
I
= 1µA
–10
SINK
–
–
10
125°C
–55°C
V
V
+ 2
+ 1
T
= 125°C, V = ±15V
A
A
S
–20
–30
–40
NO LOAD
= 5k TO GROUND
25°C
T
= 25°C, V = ±15V
S
R
L
–
V
0
1
2
0
3
0.01
0.1
1
10
–50 –25
0
25
50
75 100 125
TIME FROM OUTPUT SHORT TO GROUND (MINUTES)
SOURCING OR SINKING LOAD CURRENT (mA)
TEMPERATURE (°C)
LT1077 • TPC24
LT1077 • TPC23
LT1077 • TPC22
Common Mode Range vs
Temperature
Undistorted Output Swing
vs Frequency
Closed Loop Output
Impedance
+
V
30
20
10
0
V+ = 2.5V TO 18V
T
= 25°C
A
– = 0V TO –18V
1k
V
LOAD R , TO GROUND
L
+
+
–
5
4
3
2
1
V
V
V
– 1
– 2
+ 1
V
= 5V, 0V, R ≥ 100k
L
S
A
= 100
100
10
1
V
V
= ±15V
≥ 100k
S
R
V
= 5V, 0V
L
L
S
R
≥ 1k
A
= 1
V
A
= 10
V
–
V
V
= ±15V
L
S
R
0.1
= 30k
–
V
– 1
0
–50
0
25
50
75 100 125
10
100
1k
10k
100k
–25
100
1k
10k
100k
TEMPERATURE (°C)
FREQUENCY (Hz)
FREQUENCY (Hz)
LT1077 • TPC25
LT1077 • TPC27
LT1077 • TPC26
1077fa
8
LT1077
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Common Mode Rejection Ratio
vs Frequency
Power Supply Rejection Ratio
vs Frequency
120
100
80
120
T
= 25°C
A
POSITIVE
SUPPLY
100
V
= ±15V
S
80
60
V
= 5V, 0V
S
60
NEGATIVE
SUPPLY
40
20
0
40
20
0
V
T
= ±2.5V + 1V SINE WAVE
= 25°C
S
A
P-P
1k
FREQUENCY (Hz)
100k
0.1
1
10 100
10k
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
LT1077 • TPC29
LT1077 • TPC28
W U U
U
APPLICATIO S I FOR ATIO
The LT1077 is 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 given by the PSRR and CMRR
specifications. For example, if PSRR = 114dB ( = 2µV/V),
at 9V the offset voltage change will be 8µV. Similarly,
VS ±2.5V,VCM =0isequivalenttoacommonmodevoltage
change of 2.4V or a VOS change of 7µV if
CMRR = 110dB (3µV/V).
The LT1077 replaces and upgrades such micropower op
ampsastheOP-20,LM4250,andOP-90,providedthatthe
externalnullingcircuitry(andsetresistorinthecaseofthe
LM4250) are removed. Since the offset voltage of the
LT1077 is extremely low, nulling will be unnecessary in
most applications.
Single Supply Operation
The LT1077 is 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.
A full set of specifications is also provided at ±15V supply
voltages for comparison with other devices and for
completeness.
The LT1077 is pin compatible to, and directly replaces,
such precision op amps as the OP-07, OP-77, AD7O7 and
LT1001 with 30 to 60 times savings in supply current. The
LT1077 is also a direct plug-in replacement for LT1012
and OP-97 devices with 10 times lower dissipation.
Compatibility includes externally nulling the offset
voltage, as all of the devices above are trimmed with
a potentiometer between Pins 1 and 8 and the wiper
tied to V+.
Consider the difference amplifiers shown in Typical
Applications as an example. When the common mode
signal is high and the output low, the amplifier has to sink
current. In the gain of 10 circuit, the competing devices
requirea30kpull-downresistorattheoutputtohandlethe
specified signals. (The LT1077 does not need pull-down
1077fa
9
LT1077
W U U
U
APPLICATIO S I FOR ATIO
resistors.) When the output is high the pull-down resistor
draws 80µA which dominates the micropower current
budget. This situation is much worse in the gain of one
circuitwithV–=0V.At100Vcommonmode,theoutputhas
to sink 2µA. At a minimum output voltage of 20mV
competing devices require a 10k pull-down resistor. As
the output now swings to 10V, this resistor draws 1mA of
current.
Single supply operation can also create difficulties at the
input. The driving signal can fall below 0V—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
(a and b), OP-90/290/490 (b only):
a) When the input is more than a diode drop below
ground, unlimited current will flow from the substrate
(V– terminal)totheinput(thiscandestroytheunit).Onthe
LT1077, resistors in series with the input protect the
device even when the input is 5V below ground.
Since the output of the LT1077 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 below; however, it is not
enough to make the amplifier function properly in the
voltage follower mode.
b) 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 lock-up in servo
systems). Due to a unique phase reversal protection
circuitry, the LT1077’s output does not reverse, as
illustrated below, even when the input is at –1.0V.
Gain 100 Amplifier
Voltage Follower
5V
5V
R
99R
100mV
–
–
OUTPUT
SATURATED
≈ 3.5mV
1mV
1mV
+
+
LT1077 • AI01
Voltage Follower with Input Exceeding the Negative Common Mode Range (VS = 5V, 0V)
4V
4V
4V
2V
0
2V
0
2V
0
6V INPUT
P-P
–1.0 TO 5.0V
1ms/DIV
OP-90
EXHIBITS OUTPUT
PHASE REVERSAL
1ms/DIV
LT1077
NO PHASE REVERSAL
1ms/DIV
1077fa
10
LT1077
W U U
APPLICATIO S I FOR ATIO
U
Comparator Applications
The single supply operation of the LT1077 and its
ability to swing close to ground while sinking current,
lends itself to use as a precision comparator with
TTL compatible output.
Comparator Rise Response Time
to 10mV, 5mV, 2mV Overdrive
Comparator Fall Response Time
to 10mV, 5mV, 2mV Overdrive
4
2
4
2
0
0
0
100
–100
0
VS = 5V, 0V 200µs/DIV
VS = 5V, 0V 200µs/DIV
U
TYPICAL APPLICATIO S
Megaohm Input Impedance
Gain of 10 Difference Amplifier
10M
3V
1M
2
3
7
4
6
OUTPUT
0.005 TO 2.4V
INPUT
1M
10M
BANDWIDTH = 20KHZ
OUTPUT OFFSET = 0.7mV
OUTPUT NOISE = 80µVPP (0.1Hz TO 10Hz)
260µV
OVER FULL BANDWIDTH
RMS
SUPPLY CURRENT = 45µA
THE USEFULNESS OF DIFFERENCE AMPLIFIERS IS LIMITED BY THE FACT
THAT THE INPUT RESISTANCE IS EQUAL TO THE SOURCE RESISTANCE.
THE PICO-AMPERE OFFSET CURRENT AND LOW CURRENT NOISE OF THE LT1077
ALLOWS THE USE OF 1M SOURCE RESISTORS WITHOUT DEGRADATION IN
PERFORMANCE. IN ADDITION, WITH MEGAOHM RESISTORS MICROPOWER
OPERATION CAN BE MAINTAINED
LT1077 • TA03
1077fa
11
LT1077
TYPICAL APPLICATIO S
U
±250V Common Mode Range Difference Amplifier (AV = 1)
R1
1M
R5
975k
– IN
3
4
1
50k OPTIONAL
CMRR
R2
20k
R6
25k
3V TO 18V
7
TRIM
2
2
6
R3
1M
OUT
3
COMMON
MODE
7
6
5
+IN
4
INPUT
R4
19.608k
±250V
OV TO –18V
R1 TO R6: VISHAY 444 ACCUTRACT THIN FILM
SIP NETWORK
X
:VISHAY 444 PIN NUMBERS
VISHAY INTERTECHNOLOGY, INC.
63 LINCOLN HIGHWAY
MALVERN, PA 19355
COMMON MODE REJECTION RATIO = 74dB (RESISTOR LIMITED)
WITH OPTIONAL TRIM = 108dB
OUTPUT OFFSET (TRIMMABLE TO ZERO) = 500µV
OUTPUT OFFSET DRIFT = 25µV/°C
INPUT RESISTANCE = 1M
COMMON MODE RANGE = ±250V, V+ = 6.2V TO 18V, V– = –4.7V TO –18V
= ±100V, V++≥ 3.2V, V– ≤ –1.8V
= 100V, –13V, V+ ≥ 3.2V, V– = 0V
LT1077 • TA04
Two Terminal Current Source
Half-Wave Rectifier
2M
3.6V TO 40V
3V
2
3
7
1M
1M
–
+
INPUT
–
6
LT1077
4
LT1077
OUTPUT
= 6mV
+
V
0MIN
I
+
V
–
NO DISTORTION TO 100Hz
S
750k
R1
R1
1.8V
1.8V
0
–1.8V
LT1034
1.2V
LT1077 • TA06
LT1077 • TA05
I
O
V
R
R1
R
I
=
=
+ I
S
L
O
1
1.230V
+ 50µA
R
1
MINIMUM CURRENT = 50µA (R1 → ∞)
MAXIMUM CURRENT = 10.3mA (R1 = 120Ω)
1077fa
12
LT1077
W
W
SI PLIFIED SCHE ATIC
1077fa
13
LT1077
U
PACKAGE DESCRIPTIO
H Package
8-Lead TO-5 Metal Can (.200 Inch PCD)
(Reference LTC DWG # 05-08-1320)
.335 – .370
(8.509 – 9.398)
DIA
.027 – .045
(0.686 – 1.143)
45°TYP
PIN 1
.028 – .034
(0.711 – 0.864)
.305 – .335
(7.747 – 8.509)
.040
(1.016)
MAX
.200
(5.080)
TYP
.050
(1.270)
MAX
.165 – .185
(4.191 – 4.699)
REFERENCE
PLANE
SEATING
PLANE
GAUGE
PLANE
.110 – .160
.500 – .750
(2.794 – 4.064)
INSULATING
STANDOFF
(12.700 – 19.050)
.010 – .045*
(0.254 – 1.143)
.016 – .021**
(0.406 – 0.533)
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND THE SEATING PLANE
.016 – .024
(0.406 – 0.610)
**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS
H8(TO-5) 0.200 PCD 0801
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
.405
(10.287)
MAX
CORNER LEADS OPTION
(4 PLCS)
.005
(0.127)
MIN
6
5
4
8
7
.023 – .045
(0.584 – 1.143)
HALF LEAD
OPTION
.025
.220 – .310
(5.588 – 7.874)
.045 – .068
(0.635)
RAD TYP
(1.143 – 1.650)
FULL LEAD
OPTION
1
2
3
.200
(5.080)
MAX
.300 BSC
(7.62 BSC)
.015 – .060
(0.381 – 1.524)
.008 – .018
(0.203 – 0.457)
0° – 15°
.045 – .065
(1.143 – 1.651)
.125
3.175
MIN
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
.014 – .026
(0.360 – 0.660)
.100
(2.54)
BSC
J8 0801
OBSOLETE PACKAGES
1077fa
14
LT1077
U
PACKAGE DESCRIPTIO
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400*
(10.160)
MAX
8
7
6
5
4
.255 ± .015*
(6.477 ± 0.381)
1
2
3
.130 ± .005
.300 – .325
.045 – .065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
.065
(1.651)
TYP
.009 – .015
(0.229 – 0.381)
.125
.020
(0.508)
MIN
(3.175)
MIN
+.035
.325
–.015
.018 ± .003
(0.457 ± 0.076)
.100
(2.54)
BSC
+0.889
8.255
(
)
N8 0502
–0.381
NOTE:
INCHES
1. DIMENSIONS ARE
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
1077fa
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
LT1077
U
PACKAGE DESCRIPTIO
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
.045 ±.005
NOTE 3
.050 BSC
N
7
5
8
6
N
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
1
2
3
N/2
N/2
4
.030 ±.005
TYP
RECOMMENDED SOLDER PAD LAYOUT
1
3
2
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0502
1077fa
LW/TP 1002 1K REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
■
■
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 1989
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