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參數(shù)資料
| 型號： | AD8066AR |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 18/29頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP VF R-R DUAL LN LP 8SOIC |
| 設(shè)計資源： | Precision, Bipolar Configuration for the AD5426/32/43 8-Bit to12-Bit DACs (CN0036) Precision, Bipolar, Configuration for AD5450/1/2/3 8-14bit Multiplying DACs (CN0053) |
| 標準包裝： | 98 |
| 系列： | FastFET™ |
| 放大器類型： | 電壓反饋 |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 180 V/µs |
| -3db帶寬： | 145MHz |
| 電流 - 輸入偏壓： | 3pA |
| 電壓 - 輸入偏移： | 400µV |
| 電流 - 電源： | 6.6mA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 5 V ~ 24 V，±2.5 V ~ 12 V |
| 工作溫度： | -40°C ~ 85°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： | 管件 |
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AD8065/AD8066
Rev. J | Page 24 of 28
RSH = 1011Ω
VO
RF
CF
CM
RF
CM
CD
CF +CS
CS
VB
IPHOTO
02916-E
-058
Figure 58. Wideband Photodiode Preamp
INPUT-TO-OUTPUT COUPLING
To minimize capacitive coupling between the inputs and output,
the output signal traces should not be parallel with the inputs.
WIDEBAND PHOTODIODE PREAMP
Figure 58 shows an I/V converter with an electrical model of a
photodiode. The basic transfer function is
F
PHOTO
OUT
R
sC
R
I
V
+
×
=
1
where IPHOTO is the output current of the photodiode, and the
parallel combination of RF and CF sets the signal bandwidth.
The stable bandwidth attainable with this preamp is a function
of RF, the gain bandwidth product of the amplifier, and the total
capacitance at the amplifier’s summing junction, including CS
and the amplifier input capacitance. RF and the total capacitance
produce a pole in the amplifier’s loop transmission that can
result in peaking and instability. Adding CF creates a 0 in the
loop transmission that compensates for the pole’s effect and
reduces the signal bandwidth. It can be shown that the signal
bandwidth resulting in a 45° phase margin (f(45)) is defined by
()
S
F
CR
C
R
f
×
π
=
2
45
where fCR is the amplifier crossover frequency, RF is the feedback
resistor, and CS is the total capacitance at the amplifier summing
junction (amplifier + photodiode + board parasitics).
The value of CF that produces f(45) can be shown to be
CR
F
S
F
f
R
C
×
π
=
2
The frequency response in this case shows about 2 dB of
peaking and 15% overshoot. Doubling CF and cutting the
bandwidth in half results in a flat frequency response with
about 5% transient overshoot.
The preamp’s output noise over frequency is shown in Figure 59.
FREQUENCY (Hz)
VOLTAGE
NOISE
(
n
V/
Hz)
2
πRFCF
2
πRF (CF +CS +CM +2CD)
(CS +CM +2CD +CF)/CF
RF NOISE
VEN (CF +CS +CM + 2CD)/CF
f3
f2
f3 =
VEN
f1
f2 =
f1 =
1
fCR
NOISE DUE TO AMPLIFIER
02916-E
-059
Figure 59. Photodiode Voltage Noise Contributions
The pole in the loop transmission translates to a 0 in the
amplifier’s noise gain, leading to an amplification of the input
voltage noise over frequency. The loop transmission 0
introduced by CF limits the amplification. The noise gain
bandwidth extends past the preamp signal bandwidth and is
eventually rolled off by the decreasing loop gain of the
amplifier. Keeping the input terminal impedances matched is
recommended to eliminate common-mode noise peaking
effects, which adds to the output noise.
Integrating the square of the output voltage noise spectral
density over frequency and then taking the square root allows
users to obtain the total rms output noise of the preamp. Table 5
summarizes approximations for the amplifier and feedback and
source resistances. Noise components for an example preamp
with RF = 50 kΩ, CS = 15 pF, and CF = 2 pF (bandwidth of about
1.6 MHz) are also listed.
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| AD8066AR-EBZ | 功能描述:BOARD EVAL FOR AD8066AR RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 運算放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- |
| AD8066ARM | 功能描述:IC OPAMP VF R-R DUAL LN LP 8MSOP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:FastFET™ 標準包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| AD8066ARM-EBZ | 功能描述:BOARD EVAL FOR AD8066ARM RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 運算放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- |
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| AD8066ARM-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Dual Volt Fdbk R-R O/P ±12V/24V 8-Pin MSOP T/R |
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