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參數(shù)資料
| 型號(hào)： | OP37GS |
| 廠商： | PRECISION MONOLITHICS INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Low Noise, Precision, High Speed Operational Amplifier |
| 中文描述： | OP-AMP, 220 uV OFFSET-MAX, 63 MHz BAND WIDTH, PDSO8 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 389K |
| 代理商： | OP37GS |
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REV. A
OP37
–13–
Table I. TBD
Source
Impedance
<500
Device
Comments
Straln Gauge
Typically used in low-
frequency
applications.
Low I
B
very important to reduce
set-magnetization problems when
direct coupling is used. OP37
I
B
can be neglected.
Similar need for low I
B
in direct
coupled applications. OP47 will not
introduce any self-magnetization
problem.
Used in rugged servo-feedback
applications. Bandwidth of interest
is 400 Hz to 5 kHz.
Magnetic
Tapehead
<1500
Magnetic
Phonograph
Cartridges
<1500
Linear Variable
Differential
Transformer
<1500
Audio Applications
The following applications information has been abstracted from
a PMI article in the 12/20/80 issue of Electronic Design magazine
and updated.
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 8. TBD
Figure 8 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
μ
s, 318
μ
s, and 75
μ
s.
1
For initial equalization accuracy and stability, precision metal-
film resistors and film capacitors of polystyrene or polypropylene
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 or where space is at a premium.)
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.
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 R4form 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
against the RIAA amplified low frequency noise components
and pickup-produced low-frequency disturbances.
A preamplifier for NAB tape playback is similar to an RIAA
phono preamp, though more gain is typically demanded, along
with equalization requiring a heavy low-frequency boost. The
circuit In Figure 4 can be readily modified for tape use, as
shown by Figure 5.
Ca
Ra
R1
33k
TAPE
HEAD
0.47 F
0.01 F
R2
5k
100k
15k
T1 = 3180 s
T2 = 50 s
OP37
+
–
Figure 9. TBD
While the tape-equalization requirement has a flat high frequency
gain above 3 kHz (t
2
= 50
μ
s), the amplifier need not be stabilized
for unity gain. The decompensated OP37 provides a greater
bandwidth and slew rate. For many applications, the idealized
time constants shown may require trimming of R
A
and R2 to
optimize frequency response for non ideal tape head perfor-
mance and other factors.
5
The network values of the configuration yield a 50 dB gain at 1 kHz,
and the dc gain is greater than 70 dB. Thus, the worst-case
out-
put
offset is just over 500 mV. A single 0.47
μ
F output capacitor
can
block this level without affecting the dynamic range.
The tape head can be coupled directly to the amplifier input,
since the worst-case bias current of 85 nA with a 400 mH, 100
μ
in.
head (such as the PRB2H7K) will not be troublesome.
One potential tape-head problem is presented by amplifier bias-
current transients which can magnetize a head. The OP27 and
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| OP-37GS | 制造商:AD 制造商全稱:Analog Devices 功能描述:LOW NOISE, PRECISION, HIGH SPEED OPERATIONAL AMPLIFIER(AVCL>=5) |
| OP37GS+ | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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