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參數(shù)資料
| 型號： | LT1007 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low Noise, High Speed Precision Operational Amplifiers |
| 中文描述： | 低噪聲，高速精密運算放大器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 365K |
| 代理商： | LT1007 |
11
LT1007/LT1037
The LT1007/LT1037 achieve their low noise, in part, by
operating the input stage at 120
μ
A versus the typical 10
μ
A
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 R
S
)
2
+
(resistor noise)
2
]
1/2
Three regions can be identified as a function of source
resistance:
(i) R
S
≤
400
. Voltage noise dominates
(ii) 400
≤
R
S
≤
50k at 1kHz
400
≤
R
S
≤
8k at 10Hz
(iii) R
S
> 50k at 1kHz
R
S
> 8k at 10Hz
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 APPLICATIO
N
S
1007/37 TA03
365
1%
15k
5%
20k
TRIM
–
+
LT1037
2
15V
–15V
INPUT
3
7
6
4
OUTPUT
RN60C FILM RESISTORS
340k
1%
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.
FREQUENCY (Hz)
0.1
0.001
G
0.01
0.1
1
1
10
100
TYPICAL
PRECISION
OP AMP
LT1007
LT1037
GAIN ERROR =COPEN-LOOP GAIN
Gain 1000 Amplifier with 0.01% Accuracy, DC to 5Hz
Gain Error vs Frequency
Closed-Loop Gain = 1000
}
Resistor noise
dominates
}
Current noise
dominates
APPLICATIO
S I
N
FOR
ATIO
U
W
U
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1007_09 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Noise, High Speed Precision Op Amp |
| LT1007_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Noise, High Speed Precision Operational Amplifiers |
| LT1007A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-NOISE, HIGH-SPEED, PRECISION OPERATIONAL AMPLIFIERS |
| LT1007ACH | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Noise, High Speed Precision Operational Amplifiers |
| LT1007ACJ8 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Noise, High Speed Precision Operational Amplifiers |
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