參數(shù)資料
型號(hào)： AD8512BRZ-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 0K
描述： IC OPAMP JFET 8MHZ DUAL LN 8SOIC
設(shè)計(jì)資源： Precision, Bipolar Configuration for the AD5546/56 DAC (CN0024)
Precision, Bipolar, Configuration for AD5547/AD5557 DAC (CN0028)
標(biāo)準(zhǔn)包裝： 2,500
放大器類型： J-FET
電路數(shù)： 2
轉(zhuǎn)換速率： 20 V/µs
增益帶寬積： 8MHz
電流 - 輸入偏壓： 25pA
電壓 - 輸入偏移： 80µV
電流 - 電源： 2.2mA
電流 - 輸出 / 通道： 70mA
電壓 - 電源，單路/雙路(±)： ±4.5 V ~ 18 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SO
包裝： 帶卷 (TR)
AD8510/AD8512/AD8513
Rev. I | Page 17 of 20
I-V CONVERSION APPLICATIONS
Photodiode Circuits
Common applications for I-V conversion include photodiode
circuits where the amplifier is used to convert a current emitted
by a diode placed at the positive input terminal into an output
voltage.
The AD8510/AD8512/AD8513’s low input bias current, wide
bandwidth, and low noise make them each an excellent choice
for various photodiode applications, including fax machines,
fiber optic controls, motion sensors, and bar code readers.
The circuit shown in Figure 53 uses a silicon diode with zero
bias voltage. This is known as a photovoltaic mode; this
configuration limits the overall noise and is suitable for
instrumentation applications.
4
7
3
6
2
AD8510
Cf
R2
Rd
Ct
VEE
VCC
02
72
9-
0
48
Figure 53. Equivalent Preamplifier Photodiode Circuit
A larger signal bandwidth can be attained at the expense of
additional output noise. The total input capacitance (Ct)
consists of the sum of the diode capacitance (typically 3 pF to
4 pF) and the amplifier’s input capacitance (12 pF), which
includes external parasitic capacitance. Ct creates a pole in the
frequency response that can lead to an unstable system. To
ensure stability and optimize the bandwidth of the signal, a
capacitor is placed in the feedback loop of the circuit shown in
Figure 53. It creates a zero and yields a bandwidth whose corner
frequency is 1/(2π(R2Cf)).
The value of R2 can be determined by the ratio
V
/ID
where:
V
is the desired output voltage of the op amp.
ID
is the diode current.
For example, if ID is 100 μA and a 10 V output voltage is desired,
R2 should be 100 kΩ. Rd (see Figure 53) is a junction resistance
that drops typically by a factor of 2 for every 10°C increase in
temperature.
A typical value for Rd is 1000 MΩ. Because Rd >> R2, the
circuit behavior is not impacted by the effect of the junction
resistance. The maximum signal bandwidth is
Ct
R
ft
f
MAX
2
2π
=
where ft is the unity gain frequency of the amplifier.
Cf can be calculated by
ft
R
Ct
Cf
2
2π
=
where ft is the unity gain frequency of the op amp, and it achieves
a phase margin, φM, of approximately 45°.
A higher phase margin can be obtained by increasing the value
of Cf. Setting Cf to twice the previous value yields approximately
φM = 65° and a maximal flat frequency response, but it reduces the
maximum signal bandwidth by 50%.
Using the previous parameters with a Cf ≈ 1 pF, the signal
bandwidth is approximately 2.6 MHz.
Signal Transmission Applications
One popular signal transmission method uses pulse-width
modulation. High data rates may require a fast comparator
rather than an op amp. However, the need for sharp, undistorted
signals may favor using a linear amplifier.
The AD8510/AD8512/AD8513 make excellent voltage
comparators. In addition to a high slew rate, the AD8510/
AD8512/AD8513 have a very fast saturation recovery time. In
the absence of feedback, the amplifiers are in open-loop mode
(very high gain). In this mode of operation, they spend much of
their time in saturation.
The circuit shown in Figure 54 was used to compare two signals
of different frequencies, namely a 100 Hz sine wave and a 1 kHz
triangular wave. Figure 55 shows a scope plot of the resulting
output waveforms. A pull-up resistor (typically 5 kΩ) can be
connected from the output to VCC if the output voltage needs to
reach the positive rail. The trade-off is that power consumption
is higher.
VOUT
V1
V2
4
2
6
7
3
–15V
+15V
02
72
9-
0
49
Figure 54. Pulse-Width Modulator
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