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參數(shù)資料
| 型號(hào)： | AD743JRZ-16-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/12頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP BIFET 4.5MHZ LN 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 400 |
| 放大器類型： | J-FET |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 2.8 V/µs |
| -3db帶寬： | 4.5MHz |
| 電流 - 輸入偏壓： | 250pA |
| 電壓 - 輸入偏移： | 250µV |
| 電流 - 電源： | 8.1mA |
| 電流 - 輸出 / 通道： | 40mA |
| 電壓 - 電源，單路/雙路(±)： | 9.6 V ~ 36 V，±4.8 V ~ 18 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC W |
| 包裝： | 帶卷 (TR) |
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
1000pF
+VS
–VS
Z
1000pF
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
=
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
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
tan
=
××
1
2
100
π
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
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| AD743KN | 制造商:Rochester Electronics LLC 功能描述:LOW NOISE BIFET OP AMP IC - Bulk |
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