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PDF LT1012A Data sheet ( Hoja de datos )
| Número de pieza | LT1012A | |
| Descripción | Low Noise Op Amp | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s OP-07 Type Performance:
at 1/8th of OP-07’s Supply Current
at 1/20th of OP-07’s Bias and Offset Currents
s Guaranteed Offset Voltage: 25µV Max
s Guaranteed Bias Current: 100pA Max
s Guaranteed Drift: 0.6µV/°C Max
s Low Noise, 0.1Hz to 10Hz: 0.5µVP-P
s Guaranteed Low Supply Current: 500µA Max
s Guaranteed CMRR: 114dB Min
s Guaranteed PSRR: 114dB Min
s
Guaranteed
Operation
U
at
±1.2V
Supplies
APPLICATIO S
s Replaces OP-07 While Saving Power
s Precision Instrumentation
s Charge Integrators
s Wide Dynamic Range Logarithmic Amplifiers
s Light Meters
s Low Frequency Active Filters
s Thermocouple Amplifiers
LT1012A/LT1012
Picoamp Input Current,
Microvolt Offset,
Low Noise Op Amp
DESCRIPTIO
The LT®1012 is an internally compensated universal
precision operational amplifier which can be used in
practically all precision applications. The LT1012
combines picoampere bias currents (which are
maintained over the full –55°C to 125°C temperature
range), microvolt offset voltage (and low drift with time
and temperature), low voltage and current noise, and
low power dissipation. The LT1012 achieves precision
operation on two Ni-Cad batteries with 1mW of power
dissipation. Extremely high common mode and
power supply rejection ratios, practically unmeasurable
warm-up drift, and the ability to deliver 5mA load current
with a voltage gain of one million round out the LT1012’s
superb precision specifications.
The all around excellence of the LT1012 eliminates the
necessity of the time consuming error analysis procedure
of precision system design in many applications; the
LT1012 can be stocked as the universal internally
compensated precision op amp.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Protected by U. S. patents 4,575,685 and 4,775,884
TYPICAL APPLICATIO
± 250V Common Mode Range Instrumentation Amplifier (AV = 1)
–IN 3
R1
1M
COMMON
MODE
INPUT
± 250V
+IN 7
R3
1M
R5
975k
4
1
R2 6V TO 18V R6
20k 25k
2– 7
LT1012
2
6
50k OPTIONAL
CMRR
TRIM
OUT
63 +
4
R1 TO R6: VISHAY 444
R4 ACCUTRACT THIN FILM
19.608k
SIP NETWORK
5 – 6V TO –18V X : VISHAY 444 PIN NUMBERS
VISHAY INTERTECHNOLOGY, INC
63 LINCOLN HIGHWAY
MALVERN, PA 19355
COMMON MODE REJECTION RATIO = 74dB (RESISTOR LIMITED)
WITH OPTIONAL TRIM = 130dB
OUTPUT OFFSET (TRIMMABLE TO ZERO) = 500µV
OUTPUT OFFSET DRIFT = 10µV/°C
INPUT RESISTANCE = 1M
LT1012A • TA01
Typical Distribution of Input
Offset Voltage
200
1140 UNITS
FROM THREE
160 RUNS
VS = ±15V
TA = 25°C
VCM = 0V
120
80
40
0
– 40
– 20
0
20 40
INPUT OFFSET VOLTAGE (µV)
LT1012A • TA02
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LT1012A/LT1012
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range of –55°C ≤ TA ≤ 125°C for LT1012AM and LT1012M, and –40°C ≤ TA≤ 85°C for LT1012AI and LT1012I.
VS = ± 15V, VCM = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
LT1012AM/AI
LT1012M/I
MIN TYP MAX MIN TYP MAX UNITS
VOS Input Offset Voltage
(Note 3)
Average Temperature Coefficient of
Input Offset Voltage
q 30 60
q 40 180
q 0.2 0.6
30 180
40 250
µV
µV
0.2 1.5 µV/°C
IOS Input Offset Current
(Note 3)
q 30 250
q 70 350
30 250
70 350
pA
pA
Average Temperature Coefficient of
Input Offset Current
q 0.3 2.5
0.3 2.5 pA/°C
IB Input Bias Current
(Note 3)
q ±80 ±600
q ±150 ±800
±80 ±600
±150 ±800
pA
pA
Average Temperature Coefficient of
Input Bias Current
q 0.6 6.0
0.6 6.0 pA/°C
AVOL Large-Signal Voltage Gain
CMRR
PSRR
VOUT
IS
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Input Voltage Range
Output Voltage Swing
Supply Current
VOUT = ±12V, RL ≥ 10kΩ
VOUT = ±10V, RL ≥ 2kΩ
VCM = ±13.5V
VS = ±1.5V to ± 20V
RL = 10kΩ
q
q
q
q
q
q
q
200
200
110
110
±13.5
±13
1000
600
128
126
±14
400
150 1000
100 600
108 128
108 126
±13.5
±13 ±14
650 400
800
V/mV
V/mV
dB
dB
V
V
µA
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LT1012A/LT1012
APPLICATIO S I FOR ATIO
The LT1012 may be inserted directly into OP-07, LM11,
108A or 101A sockets with or without removal of external
frequency compensation or nulling components. The
LT1012 can also be used in 741, LF411, LF156 or OP-15
applications provided that the nulling circuitry is
removed.
Although the OP-97 is a copy of the LT1012, the LT1012
directly replaces and upgrades OP-97 applications. The
LT1012C and D have lower offset voltage and drift than the
OP-97F. The LT1012A has lower supply current than the
OP-97A/E. In addition, all LT1012 grades guarantee
operation at ±1.2V supplies.
Achieving Picoampere/Microvolt Performance
In order to realize the picoampere/microvolt level
accuracy of the LT1012, proper care must be exercised.
For example, leakage currents in circuitry external to
the op amp can significantly degrade performance. High
quality insulation should be used (e.g. Teflon, Kel-F);
cleaning of all insulating surfaces to remove fluxes and
other residues will probably be required. Surface coating
may be necessary to provide a moisture barrier in high
humidity environments.
Board leakage can be minimized by encircling the input
circuitry with a guard ring operated at a potential close
to that of the inputs: in inverting configurations the
guard ring should be tied to ground, in non-inverting
connections to the inverting input at Pin 2. Guarding both
sides of the printed circuit board is required. Bulk leakage
reduction depends on the guard ring width. Nanoampere
level leakage into the offset trim terminals can affect offset
voltage and drift with temperature.
OFFSET TRIM
V+
OUTPUT
OVER COMP
78 1
6
52
43
V–
GUARD
LT1012A * AI01
Microvolt level error voltages can also be generated in
the external circuitry. Thermocouple effects caused by
temperature gradients across dissimilar metals at the
contacts to the input terminals can exceed the inherent
drift of the amplifier. Air currents over device leads should
be minimized, package leads should be short, and the two
input leads should be as close together as possible and
maintained at the same temperature.
Noise Testing
For application information on noise testing and calcula-
tions, please see the LT1008 data sheet.
Frequency Compensation
The LT1012 can be overcompensated to improve
capacitive load handling capability or to narrow noise
bandwidth. In many applications, the feedback loop around
the amplifier has gain (e.g. Iogarithmic amplifiers);
overcompensation can stabilize these circuits with a single
capacitor.
The availability of the compensation terminal permits
the use of feedforward frequency compensation to
enhance slew rate. The voltage follower feedforward
scheme bypasses the amplifier’s gain stages and slews at
nearly 10V/µs.
The inputs of the LT1012 are protected with back-to-back
diodes. Current limiting resistors are not used, because
the leakage of these resistors would prevent the realization
of picoampere level bias currents at elevated tempera-
tures. In the voltage follower configuration, when the input
is driven by a fast, large signal pulse (>1V), the input
protection diodes effectively short the output to the input
during slewing, and a current, limited only by the output
short-circuit protection will flow through the diodes.
The use of a feedback resistor, as shown in the voltage
follower feedforward diagram, is recommended because
this resistor keeps the current below the short-circuit
limit, resulting in faster recovery and settling of the output.
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11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LT1012A.PDF ] | |
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