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AD743JR-16-REEL датащи(PDF) 10 Page - Analog Devices

номер детали AD743JR-16-REEL
подробное описание детали  Ultralow Noise BiFET Op Amp
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD743JR-16-REEL датащи(HTML) 10 Page - Analog Devices

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REV. E
–10–
AD743
AN INPUT IMPEDANCE COMPENSATED, SALLEN-KEY
FILTER
The simple high-pass filter of Figure 13 has an important source
of error which is often overlooked. Even 5 pF of input capacitance
in amplifier A will contribute an additional 1% of pass-band ampli-
tude error, as well as distortion, proportional to the C/V characteristics
of the input junction capacitance. The addition of the network
designated Z will balance the source impedance—as seen by
A—and thus eliminate these errors.
A
500k
500k
1000pF
1000pF
+VS
–VS
Z
1000pF
1000pF
500k
500k
Z
Figure 13. Input Impedance Compensated
Sallen-Key Filter
TWO HIGH PERFORMANCE ACCELEROMETER
AMPLIFIERS
Two of the most popular charge-out transducers are hydrophones
and accelerometers. Precision accelerometers are typically cali-
brated for a charge output (pC/g).
* Figures 14a and 14b show
two ways in which to configure the AD743 as a low noise charge
amplifier for use with a wide variety of piezoelectric accelerom-
eters. The input sensitivity of these circuits will be determined
by the value of capacitor C1 and is equal to
V
Q
C
OUT
OUT
=
1
The ratio of capacitor C1 to the internal capacitance (CT) of the
transducer determines the noise gain of this circuit (1 + CT/C1).
The amplifier’s voltage noise will appear at its output amplified
by this amount. The low frequency bandwidth of these circuits
will be dependent on the value of resistor R1. If a T network is
used, the effective value is R1(1 + R2/R3).
AD743
R2
9k
R1
110M
(5
22M )
OUTPUT
0.8mV/pC*
C1
1250pF
R3
1k
B AND K MODEL
4370 OR
EQUIVALENT
*pC = PICOCOULOMBS
g = EARTH’S GRAVITATIONAL CONSTANT
Figure 14a. Basic Accelerometer Circuit
AD743
R3
1k
R2
9k
R4
18M
R1
110M
(5
22M )
R5
18M
OUTPUT
0.8mV/pC
C1
1250pF
C3
2.2 F
C2
2.2 F
B AND K MODEL
4370 OR
EQUIVALENT
AD711
Figure 14b. Accelerometer Circuit Using a DC
Servo Amplifier
A dc servo loop (Figure 14b) can be used to assure a dc output
which is <10 mV, without the need for a large compensating
resistor when dealing with bias currents as large as 100 nA. For
optimal low frequency performance, the time constant of the
servo loop (R4C2 = R5C3) should be
Time Cons
R
R
R
C
tant
≥+


10 1 1
2
3
1
LOW NOISE HYDROPHONE AMPLIFIER
Hydrophones are usually calibrated in the voltage out mode.
The circuits of Figures 15a and 15b can be used to amplify the
output of a typical hydrophone. Figure 15a shows a typical
dc-coupled circuit. The optional resistor and capacitor serve
to counteract the dc offset caused by bias currents flowing through
resistor R1. Figure 15b, a variation of the original circuit, has a
low frequency cutoff determined by an RC time constant equal to
Time Cons
t
C
C
tan
=
××
1
2
100
πΩ
R2
1900
R4*
108
R1
108
R3
100
OUTPUT
AD743
*OPTIONAL, SEE TEXT
INPUT SENSITIVITY = –179 dB re. 1V/ Pa**
**1V PER MICROPASCAL
B AND K TYPE 8100
HYDROPHONE
CT
C1*
Figure 15a. Basic Hydrophone Amplifier


Аналогичный номер детали - AD743JR-16-REEL

производительномер деталидатащиподробное описание детали
logo
Analog Devices
AD743JR-16-REEL AD-AD743JR-16-REEL Datasheet
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Аналогичное описание - AD743JR-16-REEL

производительномер деталидатащиподробное описание детали
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Rev. E
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