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參數(shù)資料
| 型號： | AD745KRZ-16-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP BIFET 20MHZ ULN 16SOIC |
| 標準包裝： | 400 |
| 放大器類型： | J-FET |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 12.5 V/µs |
| 增益帶寬積： | 20MHz |
| -3db帶寬： | 20MHz |
| 電流 - 輸入偏壓： | 150pA |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 8mA |
| 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. D
AD745
–10–
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 14 and 15 show two
ways in which to configure the AD745 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
OUT
=
Q
OUT
C1
The ratio of capacitor C1 to the internal capacitance (CT) of the
transducer determines the noise gain of this circuit (1 + CT/C1).
The amplifiers 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).
*
pC = Picocoulombs
g = Earth’s Gravitational Constant
R3
1k
R2
9k
R1
110M
(5
22M )
C1
1250pF
B AND K
4370 OR
EQUIVALENT
OUTPUT
0.8mV/pC
AD745
Figure 14. A Basic Accelerometer Circuit
R3
1k
R2
9k
R1
110M
(5
22M )
C1
1250pF
AD745
B AND K
4370 OR
EQUIVALENT
OUTPUT
0.8mV/pC
AD711
C2
2.2 F
R4
18M
R5
18M
C3
2.2 F
Figure 15. An Accelerometer Circuit Employing a DC
Servo Amplifier
A dc servo loop (Figure 15) can be used to assure a dc output
<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 Constant
≥10 R11+
R2
R3
C1
A LOW NOISE HYDROPHONE AMPLIFIER
Hydrophones are usually calibrated in the voltage-out mode.
The circuit of Figures 16 can be used to amplify the output of a
typical hydrophone. If the optional ac coupling capacitor CC is
used, the circuit will have a low frequency cutoff determined by
an RC time constant equal to:
Time Constant
≥
××
10
1
2
100
R
CC
π
where the dc gain is 1 and the gain above the low frequency
cutoff (1/(2
π CC(100 ))) is equal to (1 + R2/R3). The circuit
of Figure 17 uses a dc servo loop to keep the dc output at 0 V
and to maintain full dynamic range for IB’s up to 100 nA. The
time constant of R7 and C1 should be larger than that of R1
and CT for a smooth low frequency response.
C1*
CC
R3
100
R2
1900
R4*
CT
R1
108
B AND K TYPE 8100 HYDROPHONE
AD745
OUTPUT
INPUT SENSITIVITY = –179dB RE. 1V/mPa**
*OPTIONAL DC BLOCKING CAPACITOR
**OPTIONAL, SEE TEXT
Figure 16. A Low Noise Hydrophone Amplifier
The transducer shown has a source capacitance of 7500 pF. For
smaller transducer capacitances (
≤300 pF), lowest noise can be
achieved by adding a parallel RC network (R4 = R1, C1 = CT)
in series with the inverting input of the AD745.
C1*
R3
100
R2
1900
CT
R4*
108
AD745
OUTPUT
AD711K
R1
108
16M
C2
0.27 F
R5
100k
R4
16M
R6
1M
DC OUTPUT
1mV FOR IB (AD745)
100nA
*OPTIONAL, SEE TEXT
Figure 17. A Hydrophone Amplifier Incorporating a DC
Servo Loop
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