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PDF LT1007 Data sheet ( Hoja de datos )
| Número de pieza | LT1007 | |
| Descripción | Low Noise / High Speed Precision Operational Amplifiers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1007/LT1037
Low Noise, High Speed
Precision Operational Amplifiers
FEATURES
s Guaranteed 4.5nV/√Hz 10Hz Noise
s Guaranteed 3.8nV/√Hz 1kHz Noise
s 0.1Hz to 10Hz Noise, 60nVP-P Typical
s Guaranteed 7 Million Min Voltage Gain, RL = 2k
s Guaranteed 3 Million Min Voltage Gain, RL = 600Ω
s Guaranteed 25µV Max Offset Voltage
s Guaranteed 0.6µV/°C Max Drift with Temperature
s Guaranteed 11V/µs Min Slew Rate (LT1037)
s Guaranteed 117dB Min CMRR
U
APPLICATIO S
s Low Noise Signal Processing
s Microvolt Accuracy Threshold Detection
s Strain Gauge Amplifiers
s Direct Coupled Audio Gain Stages
s Sine Wave Generators
s Tape Head Preamplifiers
s Microphone Preamplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTIO
The LT®1007/LT1037 series features the lowest noise
performance available to date for monolithic operational
amplifiers: 2.5nV/√Hz wideband noise (less than the noise of
a 400Ω resistor), 1/f corner frequency of 2Hz and 60nV peak-
to-peak 0.1Hz to 10Hz noise. Low noise is combined with
outstanding precision and speed specifications: 10µV offset
voltage, 0.2µV/°C drift, 130dB common mode and power
supply rejection, and 60MHz gain bandwidth product on the
decompensated LT1037, which is stable for closed-loop
gains of 5 or greater.
The voltage gain of the LT1007/LT1037 is an extremely high
20 million driving a 2kΩ load and 12 million driving a 600Ω
load to ±10V.
In the design, processing and testing of the device, particular
attention has been paid to the optimization of the entire
distribution of several key parameters. Consequently, the
specifications of even the lowest cost grades (the LT1007C
and the LT1037C) have been spectacularly improved com-
pared to equivalent grades of competing amplifiers.
The sine wave generator application shown below utilizes the
low noise and low distortion characteristics of the LT1037.
TYPICAL APPLICATIO
Ultrapure 1kHz Sine Wave Generator
430Ω
#327 LAMP
2–
LT1037
3+
R
6 OUTPUT
f= 1
C 2πRC
R = 1591.5Ω ±0.1%
C = 0.1µF ±0.1%
C R TOTAL HARMONIC DISTORTION = < 0.0025%
NOISE = < 0.0001%
AMPLITUDE = ±8V
OUTPUT FREQUENCY = 1.000kHz FOR VALUES GIVEN ±0.4%
1007/37 TA01
0.1Hz to 10Hz Noise
0 2 4 6 8 10
TIME (SEC)
1007/37 TA02
sn100737 100737fbs
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LT1007/LT1037
10Hz Voltage Noise Distribution
140
VS = ±15V
120 TA = 25°C
497 UNITS MEASURED
100 FROM SIX RUNS
80
60
40
20
0
0 1 2 3 4 5 6 7 8 9 10
VOLTAGE NOISE DENSITY (nV/√Hz)
1007/37 G01
0.01Hz to 1Hz Peak-to-Peak Noise
0 20 40 60 80 100
TIME (SEC)
1007/37 G04
Current Noise vs Frequency
10
3
MAXIMUM
1
0.3 1/f CORNER = 120Hz
TYPICAL
0.1
10
100 1k
FREQUENCY (Hz)
10k
1007/37 G07
Voltage Noise vs Frequency
100
VS = ±15V
TA = 25°C
30
0.02Hz to 10Hz RMS Noise. Gain = 50,000
(Measured on HP3582 Spectrum Analyzer)
10
3
1/f CORNER = 2Hz
MAXIMUM
TYPICAL
1
0.1 1 10 100 1000
FREQUENCY (Hz)
1007/37 G02
MARKER AT 2Hz ( = 1/f CORNER) = 179µV/√Hz = 3.59 nV
50,000
√Hz
1007/37 G03
Total Noise vs Source Resistance
1000
R
R
VS = ±15V
TA = 25°C
SOURCE RESISTANCE = 2R
100
AT 1kHz
AT 10Hz
10
1
0.1
RESISTOR
NOISE ONLY
1 10
SOURCE RESISTANCE (kΩ)
100
1007/37 G05
Wideband Voltage Noise
(0.1Hz to Frequency Indicated)
10
1
0.1
0.01
0.1
1 10
BANDWIDTH (kHz)
100
1007/37 G08
Voltage Noise vs Temperature
5
VS = ±15V
4
AT 10Hz
3
AT 1kHz
2
1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1007/37 G06
Voltage Noise vs Supply Voltage
5
TA = 25°C
4
3 AT 10Hz
AT 1kHz
2
1
0
0 5 10 15 20 25
SUPPLY VOLTAGE (±V)
1007/37 G09
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5
5 Page 
LT1007/LT1037
APPLICATIONS INFORMATION
The LT1007/LT1037 achieve their low noise, in part, by
operating the input stage at 120µA versus the typical 10µA
of most other op amps. Voltage noise is inversely propor-
tional while current noise is directly proportional to the
square root of the input stage current. Therefore, the
LT1007/LT1037’s current noise will be relatively high. At
low frequencies, the low 1/f current noise corner fre-
quency (≈120Hz) minimizes current noise to some extent.
In most practical applications, however, current noise will
not limit system performance. This is illustrated in the
Total Noise vs Source Resistance plot in the Typical
Performance Characteristics section, where:
Total Noise = [(voltage noise)2 + (current noise • RS)2 +
(resistor noise)2]1/2
Three regions can be identified as a function of source
resistance:
(i) RS ≤ 400Ω. Voltage noise dominates
}(ii) 400Ω ≤ RS ≤ 50k at 1kHz Resistor noise
400Ω ≤ RS ≤ 8k at 10Hz dominates
}(iii) RS > 50k at 1kHz Current noise
RS > 8k at 10Hz dominates
Clearly the LT1007/LT1037 should not be used in region
(iii), where total system noise is at least six times higher
than the voltage noise of the op amp, i.e., the low voltage
noise specification is completely wasted.
TYPICAL APPLICATIONS
Gain 1000 Amplifier with 0.01% Accuracy, DC to 5Hz
340k 15k 20k
1% 5% TRIM
365Ω
1%
15V
2– 7
LT1037
3+
4
6
OUTPUT
RN60C FILM RESISTORS
INPUT
–15V
THE HIGH GAIN AND WIDE BANDWIDTH OF THE LT1037 (AND LT1007) IS
USEFUL IN LOW FREQUENCY, HIGH CLOSED-LOOP GAIN AMPLIFIER
APPLICATIONS. A TYPICAL PRECISION OP AMP MAY HAVE AN OPEN-LOOP
GAIN OF ONE MILLION WITH 500kHz BANDWIDTH. AS THE GAIN ERROR
PLOT SHOWS, THIS DEVICE IS CAPABLE OF 0.1% AMPLIFYING ACCURACY
UP TO 0.3Hz ONLY. EVEN INSTRUMENTATION RANGE SIGNALS CAN VARY
AT A FASTER RATE. THE LT1037’S “GAIN PRECISION-BANDWIDTH
PRODUCT” IS 200 TIMES HIGHER AS SHOWN.
Gain Error vs Frequency
Closed-Loop Gain = 1000
1
TYPICAL
PRECISION
OP AMP
0.1 LT1007
LT1037
0.01
0.001
0.1
GAIN ERROR = CLOSED-LOOP GAIN
OPEN-LOOP GAIN
1 10
FREQUENCY (Hz)
100
1007/37 TA03
sn100737 100737fbs
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1007.PDF ] | |
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