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參數資料
| 型號： | AD8512AR-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Precision, Very Low Noise, Low Input Bias Current, Wide Bandwidth JFET Operational Amplifiers |
| 中文描述： | DUAL OP-AMP, 1800 uV OFFSET-MAX, 8 MHz BAND WIDTH, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁數： | 17/20頁 |
| 文件大小： | 497K |
| 代理商： | AD8512AR-REEL |
AD8510/AD8512/AD8513
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.
Rev. E | Page 17 of 20
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
V
EE
V
CC
0
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, which may 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
R
2 can be determined by the ratio V/I
D
, where V is
the desired output voltage of the op amp and I
D
is the diode
current. For example, if I
D
is 100 μA and a 10 V output voltage is
desired, R2 should be 100 k. Rd 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 M. Since Rd >> R2,
the circuit behavior is not impacted by the effect of the junction
resistance. The maximum signal bandwidth is
Ct
2
R
ft
f
MAX
2
π
=
where f
t
is the unity gain frequency of the amplifier.
Using the parameters above,
Cf
≈ 1 pF, which yields a signal
bandwidth of about 2.6 MHz.
ft
R
Ct
Cf
2
2
π
=
where
ft
is the unity gain frequency of the op amp, achieves a
phase margin, Φ
m
, 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
Φ
m
= 65° and a maximally flat frequency response, but reduces
the maximum signal bandwidth by 50%.
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