參數(shù)資料
型號(hào)： AD8615AUJZ-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 5/20頁(yè)
文件大?。?/td> 0K
描述： IC OPAMP GP R-R CMOS LN TSOT23-5
產(chǎn)品培訓(xùn)模塊： Top Five Problems in Photodiode Opamp Circuits
設(shè)計(jì)資源： Compact, Low Cost, 5 V, Variable Gain, Noninverting Amplifier Using AD5270/2 and AD8615 (CN0161)
Compact, Low Cost, 5 V, Variable Gain, Inverting Amplifier Using AD5270/2 and AD8615(CN0168)
標(biāo)準(zhǔn)包裝： 1
系列： DigiTrim®
放大器類型： 通用
電路數(shù)： 1
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 12 V/µs
增益帶寬積： 24MHz
電流 - 輸入偏壓： 0.2pA
電壓 - 輸入偏移： 23µV
電流 - 電源： 1.7mA
電流 - 輸出 / 通道： 150mA
電壓 - 電源，單路/雙路(±)： 2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： SOT-23-5 細(xì)型，TSOT-23-5
供應(yīng)商設(shè)備封裝： TSOT-23-5
包裝： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面： 773 (CN2011-ZH PDF)
其它名稱： AD8615AUJZ-REEL7DKR
Data Sheet
AD8615/AD8616/AD8618
HIGH SPEED PHOTODIODE PREAMPLIFIER
The AD8615/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 preamplifiers.
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 and op
amp input capacitances. This creates a feedback pole that causes
degradation of the phase margin, making the op amp unstable.
Therefore, it is 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 fU is the unity-gain bandwidth of the amplifier.
V–
+2.5V
V+
–2.5V
R2
C2
CIN
CD
RSH
ID
–VBIAS
–
+
04648-
044
Figure 44. 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 45 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
V–
VCC
V+
VEE
2nF
1nF
1.1k
1.1k
VIN
04648-
045
Figure 45. Second-Order, Low-Pass Filter
–40
–30
–20
–10
0
10
G
A
IN
(
d
B)
1
0.1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
04648-
046
Figure 46. Second-Order Butterworth, Low-Pass Filter Frequency Response
POWER DISSIPATION
Although the AD8615/AD8616/AD8618 are capable of providing
load currents up to 150 mA, the usable output, load current,
and drive capability are limited to the maximum power dissipation
allowed by the device package.
In any application, the absolute maximum junction temperature
for the AD8615/AD8616/AD8618 is 150°C. This should never
be exceeded because the device could suffer premature failure.
Accurately measuring power dissipation of an integrated circuit
is not always a straightforward exercise; Figure 47 is a design aid
for setting a safe output current drive level or selecting a heat
sink for the package options available on the AD8616.
PO
W
ER
D
ISSI
PA
TION
(
W)
TEMPERATURE (°C)
0
0.5
1.0
1.5
20
40
60
80
120
100
140
SOIC
MSOP
04648-
047
Figure 47. Maximum Power Dissipation vs. Ambient Temperature
These thermal resistance curves were determined using the
AD8616 thermal resistance data for each package and a
maximum junction temperature of 150°C.
Rev. F | Page 13 of 20
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