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參數(shù)資料
| 型號(hào)： | AR8618ARU |
| 廠商： | Analog Devices, Inc. |
| 元件分類(lèi)： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:8; Series:; Body Material:Aluminum Alloy; Connecting Termination:Solder; Connector Shell Size:24; Circular Contact Gender:Socket; Circular Shell Style:Cable Receptacle; Insert Arrangement:24-6 RoHS Compliant: No |
| 中文描述： | 精密20兆赫的CMOS軌到軌輸入/輸出運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大?。?/td> | 495K |
| 代理商： | AR8618ARU |
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AD8616/AD8618
HIGH SPEED PHOTODIODE PREAMPLIFIER
The AD8616/AD8618 are excellent choices for I-to-V
conversions. The very low input bias, low current noise, and
high unity gain bandwidth of the parts make them suitable,
especially for high speed photodiode preamps.
Rev. A | Page 14 of 16
In high speed photodiode applications, the diode is operated in
a photoconductive mode (reverse biased). This lowers the
junction capacitance at the expense of an increase in the
amount of dark current that flows out of the diode.
The total input capacitance, C1, is the sum of the diode
capacitance and that of the op amp. This creates a feedback pole
and causes degradation of the phase margin, making the op
amp unstable. It is therefore necessary to use a capacitor in the
feedback to compensate for this pole.
To get the maximum signal bandwidth, select
U
f
2
R
1
C
2
C
π
=
2
where
f
U
is the unity gain bandwidth of the amplifier.
V–
–2.5V
V+
+2.5V
R2
C2
C
IN
C
D
R
SH
I
D
–V
BIAS
0
–
+
Figure 46. High Speed Photodiode Preamplifier
ACTIVE FILTERS
The low input bias current and high unity gain bandwidth of
the AD8616 make it an excellent choice for precision filter
design.
Figure 47 shows the implementation of a second-order low-pass
filter. The Butterworth response has a corner frequency of
100 kHz and a phase shift of 90°. The frequency response is
shown in Figure 48.
V–
V
EE
V+
V
CC
2nF
1nF
1.1k
1.1k
V
IN
0
Figure 47. Second-Order Low-Pass Filter
–40
–30
–20
–10
0
10
G
1
0.1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
0
Figure 48. Second-Order Butterworth Low-Pass Filter Frequency Response
POWER DISSIPATION
Although the AD8616/AD8618 are capable of providing load
currents to 150 mA, the usable output load current drive
capability is limited to the maximum power dissipation allowed
by the device package used. In any application, the absolute
maximum junction temperature for the AD8616/AD8618 is
150°C; this should never be exceeded because the device could
suffer premature failure. Accurately measuring power dissipa-
tion of an integrated circuit is not always a straightforward
exercise; Figure 49 has been provided as a design aid for setting
a safe output current drive level or selecting a heat sink for the
package options available on the AD8616.
P
TEMPERATURE (
°
C)
0
0
0.5
1.0
1.5
20
40
60
80
120
100
140
0
SOIC
MSOP
Figure 49. Maximum Power Dissipation vs. Ambient Temperature
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| C052C102F1G5CA | MILITARY SPECIFCATIONS ON BACK |
| C052 | MILITARY SPECIFCATIONS ON BACK |
| C052C-K-G | MILITARY SPECIFCATIONS ON BACK |
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