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參數(shù)資料
| 型號： | OP27CZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low-Noise, Precision Operational Amplifier |
| 中文描述： | OP-AMP, 300 uV OFFSET-MAX, 8 MHz BAND WIDTH, CDIP8 |
| 封裝： | HERMETIC SEALED, CERAMIC, DIP-8 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 370K |
| 代理商： | OP27CZ |
REV. A
OP27
–13–
Therefore, for low-frequency applications, the OP07 is better
than the OP27/OP37 when R
S
> 3 k
. The only exception is
when gain error is important. Figure 6 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.
Table I.
Source
Impedance
<500
Device
Comments
Strain Gauge
Typically used in low-
frequency applications.
Magnetic
Tapehead
<1500
Low is very important to
reduce self-magnetization
problems when direct coupling
is used. OP27 I
B
can be
neglected.
Magnetic
Phonograph
Cartridges
<1500
Similar need for low I
B
in
direct coupled applications.
OP27 will not introduce any
self-magnetization problem.
Linear Variable
Differential
Transformer
<1500
Used in rugged servo-feedback
applications. Bandwidth of
interest is 400 Hz to 5 kHz.
Open-Loop Gain
Frequency at
OP07
OP27
OP37
3 Hz
10 Hz
30 Hz
100 dB
100 dB
90 dB
124 dB
120 dB
110 dB
125 dB
125 dB
124 dB
For further information regarding noise calculations, see
“
Minimization of Noise
in Op Amp Applications,
”
Application Note AN-15.
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
= 10k , R
S2
= 0
2 R
S
MATCHED
e.g. R
S
= 10k , R
S1
= R
S2
= 5k
1
2
Figure 6. 10 Hz Noise vs. Source Resistance (Includes
Resistor Noise)
AUDIO APPLICATIONS
The following applications information has been abstracted
from a PMI article in the 12/20/80 issue of Electronic De-
sign magazine and updated.
Figure 7 is an example of a phono pre-amplifier circuit using the
OP27 for A1; R1-R2-C1-C2 form a very accurate RIAA net-
work with standard component values. The popular method to
accomplish RIAA phono equalization is to employ frequency-
dependent feedback around a high-quality gain block. Properly
chosen, an RC network can provide the three necessary time
constants of 3180, 318, and 75
μ
s.
1
For initial equalization accuracy and stability, precision metal
film resistors and film capacitors of polystyrene or polypropy-
lene are recommended since they have low voltage coefficients,
dissipation factors, and dielectric absorption.
4
(High-K ceramic
capacitors should be avoided here, though low-K ceramics
—
such as NPO types, which have excellent dissipation factors
and somewhat lower dielectric absorption
—
can be considered
for small values.)
Ca
150pF
A1
OP27
Ra
47.5k
R1
97.6k
MOVING MAGNET
CARTRIDGE INPUT
R2
7.87k
R3
100
C1
0.03 F
C2
0.01 F
C3
0.47 F
R4
75k
+
+
C4 (2)
220 F
LF ROLLOFF
OUT
IN
OUTPUT
R5
100k
G = 1kHz GAIN
= 0.101 (
)
R1
1 +
= 98.677 (39.9dB) AS SHOWN
Figure 7.
The OP27 brings a 3.2 nV/
√
Hz
voltage noise and 0.45 pA/
√
Hz
current noise to this circuit. To minimize noise from other
sources, R3 is set to a value of 100
, which generates a voltage
noise of 1.3 nV/
√
Hz
. The noise increases the 3.2 nV/
√
Hz
of the
amplifier by only 0.7 dB. With a 1 k
source, the circuit noise
measures 63 dB below a 1 mV reference level, unweighted, in a
20 kHz noise bandwidth.
Gain (
G
) of the circuit at 1 kHz can be calculated by the
expression:
G
R
R
=
+
0 101 1
.
1
3
For the values shown, the gain is just under 100 (or 40 dB).
Lower gains can be accommodated by increasing R3, but gains
higher than 40 dB will show more equalization errors because of
the 8 MHz gain-bandwidth of the OP27.
This circuit is capable of very low distortion over its entire range,
generally below 0.01% at levels up to 7 V rms. At 3 V output
levels, it will produce less than 0.03% total harmonic distortion
at frequencies up to 20 kHz.
Capacitor C3 and resistor R4 form a simple
–
6 dB-per-octave
rumble filter, with a corner at 22 Hz. As an option, the switch-
selected shunt capacitor C4, a nonpolarized electrolytic, bypasses
the low-frequency rolloff. Placing the rumble filter
’
s high-pass
action after the preamp has the desirable result of discriminating
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP-27CZ | 制造商:AD 制造商全稱:Analog Devices 功能描述:LOW NOISE, PRECISION OPERATIONAL AMPLIFIER |
| OP27CZ9D0211 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OP27E | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS |
| OP-27E | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Noise, High Speed Precision Operational Amplifiers |
| OP27EFK | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS |
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