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參數(shù)資料
| 型號： | AD811 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Performance Video Op Amp(高性能視頻運放) |
| 中文描述： | 高性能視頻運算放大器（高性能視頻運放） |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 286K |
| 代理商： | AD811 |
Applications–AD811
REV. C
–9–
AD811 APPLICAT IONS
General Design Considerations
T he AD811 is a current feedback amplifier optimized for use in
high performance video and data acquisition applications. Since
it uses a current feedback architecture, its closed-loop –3 dB
bandwidth is dependent on the magnitude of the feedback resis-
tor. T he desired closed-loop gain and bandwidth are obtained
by varying the feedback resistor (R
FB
) to tune the bandwidth,
and varying the gain resistor (R
G
) to get the correct gain. T able I
contains recommended resistor values for a variety of useful
closed-loop gains and supply voltages.
T able I. –3 dB Bandwidth vs. Closed-Loop Gain and
Resistance Values
V
S
=
6
15 V
Closed-Loop
Gain
–3 dB BW
(MHz)
R
FB
R
G
+1
+2
+10
–1
–10
750
649
511
590
511
140
120
100
115
95
649
56.2
590
51.1
V
S
=
6
5 V
Closed-Loop
Gain
–3 dB BW
(MHz)
R
FB
R
G
+1
+2
+10
–1
–10
619
562
442
562
442
80
80
65
75
65
562
48.7
562
44.2
V
S
=
6
10 V
Closed-Loop
Gain
–3 dB BW
(MHz)
R
FB
R
G
+1
+2
+10
–1
–10
649
590
499
590
499
105
105
80
105
80
590
49.9
590
49.9
Figures 11 and 12 illustrate the relationship between the feed-
back resistor and the frequency and time domain response char-
acteristics for a closed-loop gain of +2. (T he response at other
gains will be similar.)
T he 3 dB bandwidth is somewhat dependent on the power sup-
ply voltage. As the supply voltage is decreased for example, the
magnitude of internal junction capacitances is increased, causing
a reduction in closed-loop bandwidth. T o compensate for this,
smaller values of feedback resistor are used at lower supply
voltages.
Achieving the Flattest Gain Response at High Frequency
Achieving and maintaining gain flatness of better than 0.1 dB at
frequencies above 10 MHz requires careful consideration of sev-
eral issues.
Choice of Feedback and Gain Resistors
Because of the above-mentioned relationship between the 3 dB
bandwidth and the feedback resistor, the fine scale gain flatness
will, to some extent, vary with feedback resistor tolerance. It is,
therefore, recommended that resistors with a 1% tolerance be
used if it is desired to maintain flatness over a wide range of pro-
duction lots. In addition, resistors of different construction have
different associated parasitic capacitance and inductance.
Metal-film resistors were used for the bulk of the characteriza-
tion for this data sheet. It is possible that values other than those
indicated will be optimal for other resistor types.
Printed Circuit Board Layout Considerations
As to be expected for a wideband amplifier, PC board parasitics
can affect the overall closed loop performance. Of concern are
stray capacitances at the output and the inverting input nodes. If
a ground plane is to be used on the same side of the board as
the signal traces, a space (3/16" is plenty) should be left around
the signal lines to minimize coupling. Additionally, signal lines
connecting the feedback and gain resistors should be short
enough so that their associated inductance does not cause
high frequency gain errors. Line lengths less than 1/4" are
recommended.
Quality of Coaxial Cable
Optimum flatness when driving a coax cable is possible only
when the driven cable is terminated at each end with a resistor
matching its characteristic impedance. If the coax was ideal,
then the resulting flatness would not be affected by the length of
the cable. While outstanding results can be achieved using inex-
pensive cables, it should be noted that some variation in flatness
due to varying cable lengths may be experienced.
Power Supply Bypassing
Adequate power supply bypassing can be critical when optimiz-
ing the performance of a high frequency circuit. Inductance in
the power supply leads can form resonant circuits that produce
peaking in the amplifier’s response. In addition, if large current
transients must be delivered to the load, then bypass capacitors
(typically greater than 1
μ
F) will be required to provide the best
settling time and lowest distortion. Although the recommended
0.1
μ
F power supply bypass capacitors will be sufficient in many
applications, more elaborate bypassing (such as using two paral-
leled capacitors) may be required in some cases.
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| AD811_04 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Performance Video Op Amp |
| AD8110 | 制造商:AD 制造商全稱:Analog Devices 功能描述:260 MHz, 16 x 8 Buffered Video Crosspoint Switches |
| AD8110AST | 制造商:Analog Devices 功能描述:Analog Video Crosspoint 390MHz 16 x 8 80-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:TQFP 250MHZ 16X8 G=+1 BUF VID XPOINT SW. - Tape and Reel 制造商:Analog Devices 功能描述:SWITCH CROSSPOINT 16X8 SMD 8110 制造商:Analog Devices 功能描述:260 MHz, 168 Buffered Video Crosspoint Switches |
| AD8110ASTZ | 功能描述:IC VIDEO CROSSPOINT SWIT 80LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 其它有關(guān)文件:STG4159 View All Specifications 標(biāo)準(zhǔn)包裝:5,000 系列:- 功能:開關(guān) 電路:1 x SPDT 導(dǎo)通狀態(tài)電阻:300 毫歐 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±1.65 V ~ 4.8 V 電流 - 電源:50nA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:7-WFBGA，F(xiàn)CBGA 供應(yīng)商設(shè)備封裝:7-覆晶 包裝:帶卷 (TR) |
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