參數(shù)資料
型號(hào)： HFA1113883
廠商： Intersil Corporation
英文描述： CAP .1UF 200V B SERIES POLY
中文描述： 輸出限制，超高速可編程增益緩沖放大器
文件頁(yè)數(shù)： 18/22頁(yè)
文件大?。?/td> 568K
代理商： HFA1113883
DESIGN INFORMATION
(Continued)
The information contained in this section has been developed through characterization by Intersil Semiconductor and is for use as
application and design information only. No guarantee is implied.
Application Information
206
HFA1113
Closed Loop Gain Selection
The HFA1113 features a novel design which allows the user
to select from three closed loop gains, without any external
components. The result is a more flexible product, fewer part
types in inventory, and more efficient use of board space.
This “buffer” operates in closed loop gains of -1, +1, or +2, and
gain selection is accomplished via connections to the
±
Inputs.
Applying the input signal to +IN and floating -IN selects a gain
of +1, while grounding -IN selects a gain of +2. A gain of -1 is
obtained by applying the input signal to -IN with +IN grounded.
The table below summarizes these connections:
PC Board Layout
The frequency response of this amplifier depends greatly on
the amount of care taken in designing the PC board.
The
use of low inductance components such as chip resis-
tors and chip capacitors is strongly recommended,
while a solid ground plane is a must!
Attention should be given to decoupling the power supplies.
A large value (10
μ
F) tantalum in parallel with a small value
(0.1
μ
F) chip capacitor works well in most cases.
Terminated microstrip signal lines are recommended at the
input and output of the device. Capacitance directly on the
output must be minimized, or isolated as discussed in the
next section.
For unity gain applications, care must also be taken to
minimize the capacitance to ground seen by the amplifier’s
inverting input. At higher frequencies this capacitance will
tend to short the -INPUT to GND, resulting in a closed loop
gain which increases with frequency. This will cause
excessive high frequency peaking and potentially other
problems as well.
An example of a good high frequency layout is the Evalua-
tion Board shown in Figure 2.
Driving Capacitive Loads
Capacitive loads, such as an A/D input, or an improperly
terminated transmission line will degrade the amplifier’s
phase margin resulting in frequency response peaking and
possible oscillations. In most cases, the oscillation can be
avoided by placing a resistor (R
S
) in series with the output
prior to the capacitance.
GAIN
(A
CL
)
-1
CONNECTIONS
+INPUT (PIN 3)
-INPUT (PIN 2)
GND
Input
+1
Input
NC (Floating)
+2
Input
GND
Figure 1 details starting points for the selection of this resis-
tor. The points on the curve indicate the R
S
and C
L
combina-
tions for the optimum bandwidth, stability, and settling time,
but experimental fine tuning is recommended. Picking a
point above or to the right of the curve yields an overdamped
response, while points below or left of the curve indicate
areas of underdamped performance.
R
S
and C
L
form a low pass network at the output, thus lim-
iting system bandwidth well below the amplifier bandwidth
of 850MHz. By decreasing R
S
as C
L
increases (as illus-
trated in the curves), the maximum bandwidth is obtained
without sacrificing stability. Even so, bandwidth does
decrease as you move to the right along the curve. For
example, at A
V
= +1, R
S
= 50
, C
L
= 30pF, the overall
bandwidth is limited to 300MHz, and bandwidth drops to
100MHz at A
V
= +1, R
S
= 5
, C
L
= 340pF.
FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs.
LOAD CAPACITANCE
Evaluation Board
The performance of the HFA1113 may be evaluated using
the HFA11XX Evaluation Board, slightly modified as follows:
1. Remove the 500
feedback resistor (R2), and leave the
connection open.
2. A. For A
V
= +1 evaluation, remove the 500
gain setting
resistor (R1), and leave pin 2 floating.
B. For A
V
= +2, replace the 500
gain setting resistor
with a 0
resistor to GND.
The layout and modified schematic of the board are shown
in Figure 2.
To order evaluation boards, please contact your local sales
office.
R
S
)
LOAD CAPACITANCE (pF)
50
45
40
35
30
25
20
15
10
5
00
40
80
120
160
200
240
280
320
360
400
A
V
= +1
A
V
= +2
Spec Number
511106-883
相關(guān)PDF資料
PDF描述
HFA1113IB Hook-Up Wire; Conductor Size AWG:30; No. Strands x Strand Size:Solid; Jacket Color:Purple; Approval Bodies:UL, CSA; Approval Categories:UL AWM Style 1061; CSA AWM; Conductor Material:Copper; Jacket Material:Polyvinylchloride (PVC) RoHS Compliant: Yes
HFA1113EVAL 850MHz, Low Distortion, Output Limiting, Programmable Gain, Buffer Amplifier
HFA1114IB 850MHz Video Cable Driving Buffer
HFA1114IP 850MHz Video Cable Driving Buffer
HFA1114 850MHz Video Cable Driving Buffer(850MHz、視頻電纜驅(qū)動(dòng)緩沖器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HFA1113EVAL 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:850MHz, Low Distortion, Output Limiting, Programmable Gain, Buffer Amplifier
HFA1113IB 功能描述:IC BUFFER 850MHZ 8-SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁(yè)面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5
HFA1113IBZ 功能描述:運(yùn)算放大器 - 運(yùn)放 W/ANNEAL BUFR 850MHZ CFB PRG-GAIN CLMP RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
HFA1113IBZ96 功能描述:運(yùn)算放大器 - 運(yùn)放 W/ANNEAL BUFR 850MHZ CFB PRG-GAIN CLMP RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
HFA1113IP 制造商:Rochester Electronics LLC 功能描述:- Bulk
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