- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376244 > OP37 (Analog Devices, Inc.) Low Noise, Precision, High Speed Operational Amplifier PDF資料下載
參數(shù)資料
| 型號： | OP37 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Noise, Precision, High Speed Operational Amplifier |
| 中文描述： | 低噪聲，高精度，高速運算放大器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 389K |
| 代理商： | OP37 |
REV. A
OP37
–12–
FREQUENCY
–
Hz
140
10
C
–
100
1k
10k
100k
1M
120
100
80
60
40
T
A
= 25 C
V
S
= 15V
V
= 20V p-p
AC TRIM @ 10kHz
R
S
= 0
R
= 100 ,
1k UNBALANCED
R
= 1k
BALANCED
R
S
= 0
Figure 4b. TBD
Comments on Noise
The OP37 is a very low-noise monolithic op amp. The outstanding
input voltage noise characteristics of the OP37 are achieved
mainly by operating the input stage at a high quiescent current.
The input bias and offset currents, which would normally increase,
are held to reasonable values by the input bias current cancellation
circuit. The OP37A/E has I
B
and I
OS
of only
±
40 nA and 35 nA
respectively at 25
°
C. This is particularly important when the input
has a high source resistance. In addition, many audio amplifier
designers prefer to use direct coupling. The high I
. TCV
OS
of
previous designs have made direct coupling difficult, if not
impossible, to use.
R
S
–
SOURCE RESISTANCE
–
10
50
10k
T
–
5
500
1k
5k
1
100
50
100
50k
R
S1
R
S2
1 R
S
UNMATCHED
e.g. R
S
= R
= 10k , R
S2
= 0
2 R
S
MATCHED
e.g. R
S
= 10k , R
S1
= R
S2
= 5k
OP07
5534
OP27/37
REGISTER
NOISE ONLY
OP08/108
1
2
Figure 5. Noise vs. Resistance (Including Resistor Noise
@ 1000 Hz)
Voltage noise is inversely proportional to the square-root of bias
current, but current noise is proportional to the square-root of
bias current. The OP37’s noise advantage disappears when high
source-resistors are used. Figures 5, 6, and 7 compare OP-37
observed total noise with the noise performance of other devices
in different circuit applications.
Total noise = [( Voltage noise)2 + (current noise RS)2 +
(resistor noise_]1/2
Figure 5 shows noise versus source resistance at 1000 Hz. The
same plot applies to wideband noise. To use this plot, just multiply
the vertical scale by the square-root of the bandwidth.
R
S
–
SOURCE RESISTANCE
–
100
50
10k
p
–
50
500
1k
5k
10
1k
500
100
50k
R
S1
R
S2
1 R
S
UNMATCHED
e.g. R
S
= R
= 10k , R
S2
= 0
2 R
S
MATCHED
e.g. R
S
= 10k , R
S1
= R
S2
= 5k
OP07
5534
OP27/37
REGISTER
NOISE ONLY
OP08/108
1
2
Figure 6. Peak-to-Peak Noise (0.1 Hz to 10 Hz) vs. Source
Resistance (Includes Resistor Noise)
At R
S
< 1 k
key the OP37’s low voltage noise is maintained.
With R
S
< 1 k
, total noise increases, but is dominated by the
resistor noise rather than current or voltage noise. It is only
beyond Rs of 20kil that current noise starts to dominate. The
argument can be made that current noise is not important for
applications with low to-moderate source resistances.
The
crossover
between the OP37 and OP07 and OP08 noise occurs
in the 15 k
to 40 k
region.
R
S
–
SOURCE RESISTANCE
–
10
50
10k
T
–
5
500
1k
5k
1
100
50
100
50k
OP07
5534
OP27/37
REGISTER
NOISE ONLY
OP08/108
R
S1
R
S2
1 R
S
UNMATCHED
e.g. R
S
= R
S1
= 10k , R
S2
= 0
2 R
S
MATCHED
e.g. R
S
= 10k , R
S1
= R
S2
= 5k
1
2
Figure 7. !0 Hz Noise vs. Source resistance (Inlcludes
Resistor Noise)
Figure 6 shows the 0.1 Hz to 10 Hz peak-to-peak noise. Here
the picture is less favorable; resistor noise is negligible, current
noise becomes important because it is inversely proportional to
the square-root of frequency. The crossover with the OP-07
occurs in the 3 k
to 5 k
range depending on whether bal-
anced or unbalanced source resistors are used (at 3 k
the I
B
.
I
OS
error also can be three times the V
OS
spec.).
Therefore, for low-frequency applications, the OP07 is better
than the OP27/37 when Rs > 3 k
. The only exception is when
gain error is important. Figure 3 illustrates the 10 Hz noise. As
expected, the results are between the previous two figures.
For reference, typical source resistances of some signal sources
are listed in Table I.
相關PDF資料 |
PDF描述 |
|---|---|
| OP413 | Low Noise, Low Drift Single-Supply Operational Amplifiers(低噪聲,低漂移,單電源運算放大器) |
| OP113 | Low Noise, Low Drift Single-Supply Operational Amplifiers(低噪聲,低漂移,單電源運算放大器) |
| OP213 | Low Noise, Low Drift Single-Supply Operational Amplifiers(低噪聲,低漂移,單電源運算放大器) |
| OP450 | CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifiers |
| OP450GRU | CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifiers |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| OP-37 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Noise, High Speed Precision Operational Amplifiers |
| OP370015Z | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OP370163SR | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OP370178Z | 制造商:Analog Devices 功能描述: |
| OP37A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS |
發(fā)布緊急采購，3分鐘左右您將得到回復。