LT1077
Micropower, Single Supply,
Precision Op Amp
U
FEATURES
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DESCRIPTIO
60µA Max Supply Current
40µV Max Offset Voltage
350pA Max Offset Current
0.5µVP-P 0.1Hz to 10Hz Voltage Noise
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
Output Sources and Sinks 5mA Load Current
U
APPLICATIO S
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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 LT®1077 is a micropower precision operational
amplifier optimized for single supply operation at 5V. In
addition, ±15V specifications are provided.
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
are all two to ten times better than on previous micropower
op amps.
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.
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.
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
TYPICAL APPLICATIO
Distribution of Input Offset Voltage
35
Self Buffered Micropower Reference
30
–
7
LT1077
3
0.1µF
750k
+
6
4
LT1034
1.2V
OUTPUT
1.230V
±1.2% MAX
SUPPLY CURRENT = 60µA MAX
SOURCES UP TO 10mA
LOAD REGULATION = 30µV/mA
TEMPERATURE DRIFT = 12ppm/°C
LT1077 • TA01
PERCENT OF UNITS
3.6V TO 9V
2
25
20
VS = 5V, 0V
TA = 25°C
1072 UNITS
TESTED IN
H, J8, N8
PACKAGES
15
10
5
0
0
–40 –30 –20 –10
10 20 30 40
INPUT OFFSET VOLTAGE (µV) LT1077 • TA02
1077fa
1
LT1077
W W
W
AXI U
U
ABSOLUTE
RATI GS (Note 1)
Operating Temperature Range
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
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
U
U
W
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VOS TRIM
8
A
–IN 2
+IN 3
–
TOP VIEW
7 V+
VOS TRIM 1
B
+ +
6 OUT
–
5 NC
4
V–
H PACKAGE
8-LEAD TO-5 METAL CAN
TJMAX = 150°C, θJA = 150°C/W, θJC = 45°C/W
ORDER PART NUMBER
LT1077AMH
LT1077MH
LT1077ACH
LT1077CH
TOP VIEW
VOS TRIM 1
8
VOS TRIM
VOS TRIM 1
8
VOS TRIM
–IN 2
7
V+
–IN 2
7
V+
+IN 3
6
OUT
+IN 3
6
OUT
5
NC
V
–
4
5
V–
NC
J8 PACKAGE
8-LEAD CERDIP
TJMAX = 150°C, θJA = 100°C/W
ORDER PART NUMBER
LT1077AMJ8
LT1077MJ8
LT1077ACJ8
LT1077CJ8
OBSOLETE PACKAGE
Consider the N8 or S8 Package for Alternate Source
4
N8 PACKAGE
8-LEAD PDIP
TJMAX = 100°C, θJA = 130°C/W
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 190°C/W
ORDER PART NUMBER
LT1077S8
LT1077IS8
LT1077AIN8
LT1077IN8
LT1077ACN8
LT1077CN8
S8 PART MARKING
1077
1077I
LT1077 • POI01
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
VOS
Input Offset Voltage
VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C unless noted.
CONDITIONS
LT1077AM/AI/AC
MIN
TYP
MAX
9
40
LT1077S8
MIN
LT1077M/I/C/S8
TYP
MAX
10
12
60
150
µV
µV
∆VOS
∆Time
Long Term Input Offset
Voltage Stability
0.4
IOS
Input Offset Current
0.06
0.35
0.06
0.45
nA
IB
Input Bias Current
7
9
7
11
nA
en
Input Noise Voltage
0.1Hz to 10Hz (Note3)
0.5
1.1
0.5
µVP-P
Input Noise Voltage Density
fO = 10Hz (Note 3)
fO = 1000Hz (Note3)
28
27
43
35
28
27
nV/√Hz
nV/√Hz
Input Noise Current
0.1Hz to 10Hz (Note3)
2.5
4.5
2.5
pAP-P
in
0.4
UNITS
µV/Mo
1077fa
2
LT1077
ELECTRICAL CHARACTERISTICS
SYMBOL
VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C unless noted.
PARAMETER
CONDITIONS
Input Noise Current Density
fO = 10Hz (Note 3)
fO = 1000Hz
Input Resistance
Differential Mode
Common Mode
(Note 4)
Input Voltage Range
LT1077AM/AI/AC
MIN
TYP
MAX
0.065
0.02
MIN
LT1077M/I/C/S8
TYP
MAX
0.11
0.065
0.02
UNITS
pA/√Hz
pA/√Hz
350
700
6
270
700
6
MΩ
GΩ
3.5
0
3.8
– 0.3
3.5
0
3.8
– 0.3
V
V
CMRR
Common Mode Rejection Ratio
VCM = 0V to 3.5V
97
106
94
105
dB
PSRR
Power Supply Rejection Ratio
VS = 2.3V to 12V
102
118
100
117
dB
AVOL
Large-Signal Voltage Gain
VO = 0.03V to 4V, No Load
VO = 0.03V to 3.5V, RL = 50k
300
250
1000
1000
240
200
1000
1000
V/mV
V/mV
Maximum Output Voltage
Swing
Output Low, No Load
Output Low, 2k to GND
Output Low, lSINK = 100µA
Output High, No Load
Output High, 2k to GND
4.2
3.5
3.5
0.7
90
4.4
3.9
4.2
3.5
3.5
0.7
90
4.4
3.9
0.05
0.08
0.05
0.08
V/µs
230
kHz
SR
Slew Rate
(Note 2)
GBW
Gain Bandwidth Product
fO ≤ 20kHz
IS
Supply Current
6
1.1
130
230
48
= 10k, Wiper to V+
Offset Adjustment Range
Rpot
Minimum Supply Voltage
(Note 5)
±500
60
48
±900
±500
2.2
6
1.1
130
2.3
68
±900
2.2
mV
mV
mV
V
V
µA
µV
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.
VOS
Input Offset Voltage
∆VOS/∆T
Input Offset Voltage Drift
IOS
Input Offset Current
●
0.08
IB
Input Bias Current
●
8
CMRR
Common Mode Rejection Ratio
VCM = 0.05V to 3.2V
●
92
104
88
103
dB
PSRR
Power Supply Rejection Ratio
VS = 3.1V to 12V
●
98
114
94
113
dB
AVOL
Large-Signal Voltage Gain
VO = 0.05V to 3.5V, RL = 50k
●
120
600
100
600
V/mV
Maximum Output Voltage
Swing
Output Low, No Load
Output Low, ISINK = 100µA
Output High, No Load
Output High, 2k to GND
●
●
●
●
8
170
3.9
3
4.5
120
4.2
3.7
8
170
3.9
3
4.5
120
4.2
3.7
mV
mV
V
V
54
80
54
90
µA
Supply Current
MIN
50
●
LT1077IS8 (Note 6)
MIN
LT1077M/I
TYP
MAX
PARAMETER
IS
CONDITIONS
LT1077AM/AI
TYP MAX
SYMBOL
200
60
260
µV
1
2.5
µV/°C
0.60
0.08
0.80
nA
11
8
13
nA
●
●
UNITS
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.
SYMBOL
PARAMETER
VOS
Input Offset Voltage
CONDITIONS
LT1077S8
LT1077AC
TYP MAX
MIN
LT1077C/S8
TYP
MAX
UNITS
●
●
30
110
35
40
150
280
µV
µV
●
0.4
1.6
0.5
0.7
2.0
3.0
µV/°C
µV/°C
∆VOS/∆T
Input Offset Voltage Drift
IOS
Input Offset Current
●
0.07
0.45
0.07
0.60
nA
IB
Input Bias Current
●
7
10
7
12
nA
CMRR
Common Mode Rejection Ratio
VCM = 0V to 3.4V
●
94
105
90
104
dB
PSRR
Power Supply Rejection Ratio
VS = 2.6V to 12V
●
100
116
97
115
dB
AVOL
Large-Signal Voltage Gain
VO = 0.05V to 3.5V, RL = 50k
●
180
800
150
800
V/mV
Maximum Output Voltage Swing
Output Low, No Load
Output Low, ISINK = 100µA
Output High, No Load
Output High, 2k to GND
●
●
●
●
7
150
4.1
3.3
4.0
100
4.3
3.8
7
150
4.1
3.3
4.0
100
4.3
3.8
mV
mV
V
V
52
70
52
80
µA
IS
(Note 6)
LT1077S8 (Note 6)
MIN
Supply Current
●
VS = ±15V, TA = 25°C unless noted.
SYMBOL
PARAMETER
VOS
Input Offset Voltage
CONDITIONS
LT1077AM/AI/AC
MIN
TYP
MAX
MIN
LT1077M/I/C/S8
TYP
MAX
20
150
25
30
200
300
µV
µV
0.06
0.35
0.06
0.45
nA
7
9
7
11
nA
LT1077S8
IOS
Input Offset Current
IB
Input Bias Current
Input Voltage Range
UNITS
13.5
– 15.0
13.8
– 15.3
13.5
– 15.0
13.8
– 15.3
V
V
CMRR
Common Mode Rejection Ratio
VCM = 13.5V to –15V
100
109
97
108
dB
PSRR
Power Supply Rejection Ratio
VS = 5V, 0V to ±18V
106
122
103
120
dB
AVOL
Large-Signal Voltage Gain
VO = ±10V, RL = 50k
VO = ±10V, RL = 2k
1000
400
8000
1500
800
300
8000
1500
V/mV
V/mV
VOUT
Maximum Output Voltage Swing
RL = 50k
RL = 2k
±13.0
±11.0
±14.0
±13.2
±13.0
±11.0
±14.0
±13.2
V
V
SR
Slew Rate
0.07
0.12
0.07
0.12
V/µs
IS
Supply Current
56
75
56
85
µA
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.
MIN
VOS
Input Offset Voltage
∆VOS/∆T
Input Offset Voltage Drift
IOS
Input Offset Current
●
0.08
IB
Input Bias Current
●
8
AVOL
Large-Signal Voltage Gain
VO = ±10V, RL = 5k
●
300
1000
250
1000
V/mV
CMRR
Common Mode Rejection Ratio
VCM = 13V, –14.9V
●
94
107
90
106
dB
PSRR
Power Supply Rejection Ratio
VS = 5V, 0V to ±18V
●
100
118
97
116
dB
Maximum Output Voltage Swing
RL = 5k
●
±11
±13.5
±11
±13.5
V
60
●
LT1077IS8 (Note 6)
Supply Current
MIN
LT1077M/I
TYP
MAX
PARAMETER
IS
CONDITIONS
LT1077AM/AI
TYP MAX
SYMBOL
330
75
450
1.1
3
0.60
0.08
0.80
nA
11
8
13
nA
●
60
●
UNITS
95
60
µV
µV/°C
105
µA
LT1077C/S8
TYP
MAX
UNITS
The ● denotes the specifications which apply over the temperature range of 0°C ≤ TA ≤ 70°C.
VS = ±15V unless otherwise noted.
SYMBOL
PARAMETER
VOS
Input Offset Voltage
CONDITIONS
MIN
LT1077AC
TYP MAX
MIN
●
●
40
230
LT1077S8
50
65
320
450
µV
µV
(Note 6)
LT1077S8 (Note 6)
●
●
0.4
1.8
0.5
0.8
2.5
3.5
µV/°C
µV/°C
∆VOS/∆T
Input Offset Voltage Drift
IOS
Input Offset Current
●
0.07
0.45
0.07
0.60
nA
IB
Input Bias Current
●
7
10
7
12
nA
AVOL
Large-Signal Voltage Gain
VO = ±10V, RL = 5k
●
500
2000
400
2000
V/mV
CMRR
Common Mode Rejection Ratio
VCM = 13V, –15V
●
97
108
94
107
dB
PSRR
Power Supply Rejection Ratio
VS = 5V, 0V to ±18V
●
103
120
100
118
dB
Maximum Output Voltage Swing
RL = 5k
●
±11
±13.6
±11
±13.6
V
IS
Supply Current
Note 1: Absolute Maximum Ratings are those values beyond which the life
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 3: This parameter is tested on a sample basis only. All noise
parameters are tested with VS = ± 2.5V, VO = 0V.
●
59
85
59
95
µA
Note 4: This parameter is guaranteed by design and is not tested.
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 6: This parameter is not 100% tested.
1077fa
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LT1077
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias and Offset Currents
vs Temperature
VS = ±15V
VS = 5V, 0V
–1
40
50
25
75
0
TEMPERATURE (˚C)
–50 –25
100
125
VS = 5V, 0V
VS = 5V, 0V TO ±15V
100
–3
IOS
75
50
50
BIAS CURRENT (nA)
SUPPLY CURRENT (µA)
60
Input Bias Currents vs
Common Mode Voltage
INPUT BIAS CURRENT (nA)
OFFSET CURRENT (pA)
Supply Current vs Temperature
–6
IB
–7
–5
TA = 25°C
TA = 55°C
–7
TA = 125°C
–9
–11
–8
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
–13
–1
125
4
0
1
2
3
COMMON MODE VOLTAGE (V)
LT1077 • TPC03
LT1077 • TPC01
LT1077 • TPC02
0.01Hz to 10Hz Noise
0.1Hz to 10Hz Noise
8
0
10
20
LT1077 • TPC04
VS = ± 2.5V
TA = 2.5°C
30
PERCENT OF UNITS
25
20
15
10
CURRENT
NOISE
VOLTAGE
NOISE
30
1/f CORNER
0.7Hz
10
0.1
100
VS = 5V, 0V
VCM = 0.1V
1
1000
Distribution of Input Offset Voltage
in Small Outline (S8) Package
70
10
10
100
FREQUENCY (Hz)
LT1077 • TPC06
400 UNITS TESTED
(100 IN EACH PACKAGE)
20
VS = ± 2.5V
TA = 25°C
(AT VS = ±15V
VOLTAGE NOISE
IS 4% LESS
CURRENT NOISE
IS UNCHANGED
100
Distribution of Offset Voltage Drift
with Temperature (In All Packages)
35
PERCENT OF UNITS
80
300
LT1077 • TPC05
10Hz Voltage Noise Distribution
30
60
40
TIME (SECONDS)
60
PERCENT OF UNITS
6
4
TIME (SECONDS)
0.4µV
NOISE VOLTAGE (0.4µV/DIV)
NOISE VOLTAGE (0.4µV/DIV)
2
VOLTAGE NOISE DENSITY (nV/√Hz)
CURRNET NOISE DENSITY (fA/√Hz)
VS = ± 2.5V
TA = 2.5°C
VS = ± 2.5V
TA = 2.5°C
0
Noise Spectrum
1000
VS = 5V, 0V
TA = 25°C
456 UNITS
TESTED
50
40
30
20
10
5
0
0
25
35
30
VOLTAGE NOISE DENSITY (nV/√Hz)
40
LT1077 • TPC07
–1.0
1.0
2.0
0
–2.0
OFFSET VOLTAGE DRIFT WITH TEMPERATURE (nV/°C)
LT1077 • TPC08
0
–150 –120 –90 –60 –30 0 30 60 90 120 150
INPUT OFFSET VOLTAGE (µV)
LT1077 • TPC09
1077fa
6
LT1077
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Voltage Gain vs Frequency
VS = 5V, 0V
5V, 0V
GAIN
10
±15V 140
PHASE
MARGIN
54°
160
±15V
180
5V, 0V
0
20
200
TA = 25°C
CL = 20pF
0
1
–10
10k
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
30k
100k
300k
FREQUENCY (Hz)
70
φM ±15V
60
50
GBW ±15V
40
220
180
–50 –25
10
100
1000
CAPACITIVE LOAD (pF)
10,000
LT1077 • TPC12
Large-Signal Transient
Response VS = ±15V
25 50
0
75
TEMPERATURE (°C)
100
0V
0V
100µs/DIV
GBW 5V, 0V
200
125
50µs/DIV
AV = 1
NO LOAD
INPUT PULSE 0V TO 3.8V
AV = 1
NO LOAD
Small-Signal Transient Response
VS = ± 2.5V
Small-Signal Transient Response
VS = ±15V
0.1V
AV = 1
10µs/DIV
CL = 15pF
INPUT 50mV TO 150mV
20mV/DIV
Small-Signal Transient Response
VS = 5V, 0V
0V
AV = 1
CL = 15pF
10µs/DIV
20mV/DIV
LT1077 • TPC13
20mV/DIV
GAIN BANDWIDTH
PRODUCT (kHz)
φM ±5V, 0V
260
240
0
1M
1V/DIV
80
0.08
0.06
AV = 10
AV = 5
SLEW ±15V
SLEW 5V, 0V
0.10
40
Large-Signal Transient
Response VS = 5V, 0V
PHASE MARGIN (DEGREES)
SLEW RATE (V/µs)
fO = 20kHz
AV = 1
60
LT1077 • TPC11
Slew Rate, Gain Bandwidth
Product and Phase Margin vs
Temperature
0.12
80
20
LT1077 • TPC10
0.14
VS = 5V, 0V
TA = 25°C
5V/DIV
–20
0.01 0.1
OVERSHOOT (%)
60
100
120
PHASE SHIFT (DEGREES)
VS = ±15V
80
100
PHASE
20
VOLTAGE GAIN (dB)
VOLTAGE GAIN (dB)
100
120
PHASE
MARGIN
66°
TA = 25°C
120
40
Capacitive Load Handling
Gain, Phase vs Frequency
30
140
0V
AV = 1
CL = 15pF
10µs/DIV
1077fa
7
LT1077
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Minimum Supply Voltage
Warm-Up Drift
0.8
–200
0°C
–300
–55°C
25°C
–400
0.4
0.2
0
–500
0
2
3
1
POSITIVE SUPPLY VOLTAGE (V)
1
0
2
125°C
OUTPUT VOLTAGE SWING (V)
SATURATION VOLTAGE (mV)
ISINK = 100µA
ISINK = 10µA
ISINK = 1µA
10
NO LOAD
V+ – 1
0
25
50
75
100
–55°C
125°C
25°C
0.1
1
TA = 25°C, VS = ±15V
10
TA = 125°C, VS = 5V, 0V
0
–10
TA = 125°C, VS = ±15V
–20
PEAK-TO-PEAK OUTPUT SWING, VS = ±15V (V)
V+ – 2
V– + 1
V–
100
125
LT1077 • TPC25
TA = 25°C, VS = ±15V
LT1077 • TPC24
Undistorted Output Swing
vs Frequency
V+ – 1
TA = 125°C, VS = ±15V
LT1077 • TPC23
30
Closed Loop Output
Impedance
TA = 25°C
LOAD RL, TO GROUND
5
VS = 5V, 0V, RL ≥ 100k
20
4
VS = ±15V
RL ≥ 100k
VS = 5V, 0V
RL ≥ 1k
3
2
10
1
VS = ±15V
RL = 30k
0
100
1k
10k
FREQUENCY (Hz)
0
100k
LT1077 • TPC26
PEAK-TO-PEAK OUTPUT SIWNG, VS = 5V, 0V (V)
COMMON MODE RANGE (V)
20
1
2
3
0
TIME FROM OUTPUT SHORT TO GROUND (MINUTES)
SOURCING OR SINKING LOAD CURRENT (mA)
Common Mode Range vs
Temperature
50
25
0
75
TEMPERATURE (°C)
TA = 25°C, VS = 5V, 0V
–40
10
LT1077 • TPC22
V– – 1
– 50 –25
30
–30
–55°C
V–
0.01
1M
40
25°C
V– + 1
125
V + = 2.5V TO 18V
V – = 0V TO –18V
10k
1k
100k
LOAD RESISTANCE TO GROUND (Ω)
Short-Circuit Current vs
Time
V– + 2
TEMPERATURE (°C)
V+
4. –55°C
5. 25°C VS = 5V, 0V
6. 125°C
LT1077 • TPC21
V+ – 2
RL = 5k TO GROUND
0
–50 –25
6
Output Voltage Swing vs
Load Current
V+
100
4
LT1077 • TPC20
ISINK = 2mA
ISINK = 1mA
2
5
TIME AFTER POWER ON (MINUTES)
Output Saturation vs Temperature
vs Sink Current
VS = 5V, 0V
1
1M
100k
100
3
LT1077 • TPC19
1000
1. 25°C
2. –55°C VS = ±15V
3. 125°C
3
VOLTAGE GAIN (V/V)
–100
WARM UP DRIFT
0.6 AT VS = 5V, 0V IS
IMMEASURABLY LOW
SHORT-CIRCUIT CURRENT (mA)
SINKING
SOURCING
INPUT OFFSET VOLTAGE (µV)
125°C
NON
FUNCTIONAL
VS = ±15V
TA = 25°C
70°C
0
Voltage Gain vs Load Resistance
10M
1k
OUTPUT IMPEDANCE (Ω)
V – = 0V
– 0.1 ≤ VCM ≤ 0.4V
CHANGE IN OFFSET VOLTAGE (µV)
100
AV = 100
100
10
AV = 1
AV = 10
1
0.1
10
10k
100
1k
FREQUENCY (Hz)
100k
LT1077 • TPC27
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8
LT1077
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Common Mode Rejection Ratio
vs Frequency
120
120
TA = 25°C
POWER SUPPLY REJECTION RATIO (dB)
COMMON MODE REJECTION RATIO (dB)
Power Supply Rejection Ratio
vs Frequency
100
VS = ±15V
80
VS = 5V, 0V
60
40
20
100
1k
10k
FREQUENCY (Hz)
100k
80
60
NEGATIVE
SUPPLY
40
20
VS = ± 2.5V + 1VP-P SINE WAVE
TA = 25°C
0
0.1
0
10
POSITIVE
SUPPLY
100
1M
1
10
100 1k
10k
FREQUENCY (Hz)
100k
LT1077 • TPC29
LT1077 • TPC28
U
W
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 = 0 is equivalent to a common mode voltage
change of 2.4V or a V OS change of 7µV if
CMRR = 110dB (3µV/V).
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+.
The LT1077 replaces and upgrades such micropower op
amps as the OP-20, LM4250, and OP-90, provided that the
external nulling circuitry (and set resistor in the case of the
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 applications these competing devices cannot be operated as
micropower op amps and swing to ground simultaneously.
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
require a 30k pull-down resistor at the output to handle the
specified signals. (The LT1077 does not need pull-down
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9
LT1077
U
W
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
circuit with V –=0V. At 100V common mode, the output has
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.
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.
Gain 100 Amplifier
Voltage Follower
5V
R
–
+
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.
OUTPUT
SATURATED
≈ 3.5mV
100mV
1mV
a) When the input is more than a diode drop below
ground, unlimited current will flow from the substrate
(V – terminal) to the input (this can destroy the unit). On the
LT1077, resistors in series with the input protect the
device even when the input is 5V below ground.
5V
99R
–
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):
1mV
+
LT1077 • AI01
Voltage Follower with Input Exceeding the Negative Common Mode Range (VS = 5V, 0V)
4V
4V
4V
2V
2V
2V
0
0
0
6VP-P INPUT
–1.0 TO 5.0V
1ms/DIV
OP-90
1ms/DIV
EXHIBITS OUTPUT
PHASE REVERSAL
LT1077
1ms/DIV
NO PHASE REVERSAL
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10
LT1077
U
W
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APPLICATIO S I FOR ATIO
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
OUTPUT (V)
4
OUTPUT (V)
4
INPUT (mV)
0
0
INPUT (mV)
Comparator Applications
0
100
2
–100
200µs/DIV
0
VS = 5V, 0V
200µs/DIV
U
VS = 5V, 0V
2
TYPICAL APPLICATIO S
Megaohm Input Impedance
Gain of 10 Difference Amplifier
10M
–
1M
2
1M
3
3V
7
6
INPUT
+
OUTPUT
0.005 TO 2.4V
4
10M
BANDWIDTH = 20KHZ
OUTPUT OFFSET = 0.7mV
OUTPUT NOISE = 80µVPP (0.1Hz TO 10Hz)
260µVRMS OVER FULL BANDWIDTH
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
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11
LT1077
U
TYPICAL APPLICATIO S
±250V Common Mode Range Difference Amplifier (AV = 1)
R1
1M
R5
975k
– IN 3
4
1
R2
20k
3V TO 18V
2
COMMON
MODE
INPUT
± 250V
7
6
OPTIONAL
CMRR
TRIM
2
6
R3
1M
+ IN 7
50k
R6
25k
OUT
3
4
R4
19.608k
5
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
LT1077 • TA04
= 100V, –13V, V + ≥ 3.2V, V – = 0V
Two Terminal Current Source
Half-Wave Rectifier
2M
3.6V TO 40V
2
–
7
1M
6
LT1077
3
+
INPUT
1M
4
IS
750k
+
VR1
–
R1
3V
–
LT1077
+
V0MIN = 6mV
NO DISTORTION TO 100Hz
1.8V
1.8V
–1.8V
LT1034
1.2V
OUTPUT
0
LT1077 • TA06
LT1077 • TA05
IO
RL
IO =
=
VR1
+ IS
R1
1.230V
+ 50µA
R1
MINIMUM CURRENT = 50µA (R1 → ∞)
MAXIMUM CURRENT = 10.3mA (R1 = 120Ω)
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12
+IN
–IN
600Ω
600Ω
NULL
Q5
Q21
Q1
9k
700Ω
Q9
Q22
Q2
Q1
Q6
9k
NULL
C2
175pF
700Ω
Q7
6.2k
1
4
Q12
V+
Q39
Q28
Q27
Q3
Q16
2.2k
8.6k
Q24
6.2k
Q8
Q4
Q14
Q15
Q18
Q10 Q17
C5
2.5pF
C1
50pF
Q29
5.6k
Q19
1.3k
Q20
C3
40pF
Q37
Q32
1.35k
2.9k
Q34
Q23
Q31
Q25
3
Q30
C4
4pF
1
3.6k
3k
Q26
Q36
30Ω
10k
OUT
30Ω
Q35
1
1
LT1077 • S01
Q38
V+
150k
Q33
Q54
5k
Q50
Q47
2
Q53
Q45
11.5k
Q42
V–
Q46
5.35k
Q51
Q55
Q44
V+
V+
Q43
Q48
9.1k
Q40
Q41
Q49
J1
Q52
12.5k
700k
700k
W
W
SI PLIFIED SCHE ATIC
V–
LT1077
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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
.305 – .335
(7.747 – 8.509)
.027 – .045
(0.686 – 1.143)
PIN 1
45°TYP
.028 – .034
(0.711 – 0.864)
.040
(1.016)
MAX
.050
(1.270)
MAX
SEATING
PLANE
.200
(5.080)
TYP
.165 – .185
(4.191 – 4.699)
GAUGE
PLANE
.010 – .045*
(0.254 – 1.143)
REFERENCE
PLANE
.500 – .750
(12.700 – 19.050)
.016 – .021**
(0.406 – 0.533)
.110 – .160
(2.794 – 4.064)
INSULATING
STANDOFF
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND THE SEATING PLANE
.016 – .024
**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS
(0.406 – 0.610) H8(TO-5) 0.200 PCD 0801
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
CORNER LEADS OPTION
(4 PLCS)
.023 – .045
(0.584 – 1.143)
HALF LEAD
OPTION
.045 – .068
(1.143 – 1.650)
FULL LEAD
OPTION
.005
(0.127)
MIN
.405
(10.287)
MAX
8
7
6
5
.025
(0.635)
RAD TYP
.220 – .310
(5.588 – 7.874)
1
2
.300 BSC
(7.62 BSC)
3
4
.200
(5.080)
MAX
.015 – .060
(0.381 – 1.524)
.008 – .018
(0.203 – 0.457)
0° – 15°
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
.045 – .065
(1.143 – 1.651)
.014 – .026
(0.360 – 0.660)
.100
(2.54)
BSC
.125
3.175
MIN
J8 0801
OBSOLETE PACKAGES
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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
1
2
3
4
.255 ± .015*
(6.477 ± 0.381)
.300 – .325
(7.620 – 8.255)
.009 – .015
(0.229 – 0.381)
+.035
.325 –.015
(
8.255
+0.889
–0.381
)
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.065
(1.651)
TYP
.100
(2.54)
BSC
.125
(3.175) .020
MIN
(0.508)
MIN
.018 ± .003
(0.457 ± 0.076)
N8 0502
NOTE:
1. DIMENSIONS ARE
INCHES
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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)
NOTE 3
.045 ±.005
.050 BSC
8
7
6
5
N
N
.245
MIN
.160 ±.005
1
.030 ±.005
TYP
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
2
3
N/2
N/2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
× 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
1
.053 – .069
(1.346 – 1.752)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
.014 – .019
(0.355 – 0.483)
TYP
INCHES
(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)
2
3
4
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
SO8 0502
1077fa
16
Linear Technology Corporation
LW/TP 1002 1K REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
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