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參數(shù)資料
| 型號： | OPA655 |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Wideband, Unity Gain Stable, FET-Input OPERATIONAL AMPLIFIER |
| 中文描述： | 寬帶，單位增益穩(wěn)定，F(xiàn)ET輸入運(yùn)算放大器 |
| 文件頁數(shù)： | 14/14頁 |
| 文件大?。?/td> | 222K |
| 代理商： | OPA655 |
OPA655
14
Careful selection and placement of external compo-
nents will preserve the high frequency performance of
the OPA655.
Resistors should be a very low reactance
type. Surface mount resistors work best and allow a tighter
overall layout. Metal film or carbon composition axially-
leaded resistors can also provide good high frequency
performance. Again, keep their leads as short as possible.
Never use wirewound type resistors in the signal path for
a high frequency application. For the lowest parasitic
capacitance, consider the PR8351 style resistor from Pre-
cision Resistive Products (Phone No. 319-394-9131). These
precision buffed resistors typically have less than 0.02pF
shunt parasitic capacitance.
Since the output pin and inverting input pin are most
sensitive to parasitic capacitance, always place the feed-
back, gain setting, and series output resistor (if any) as
close as possible to the package pins. For a voltage
follower buffer application, a wide trace (0.1") on the
component side of the board between pins 6 and 2 will
reduce frequency response peaking. Be sure to open up
ground and power planes around this trace to limit para-
sitic capacitance to an AC ground on the output pin.
Connections to other wideband devices
on the board
may be made with short direct traces or through on-board
transmission lines. For short connections, consider the
trace and the input to the next device as a lumped capaci-
tive load. Relatively wide traces (50 to 100mils) should be
used, preferably with ground and power planes opened up
around them. Estimate the total capacitive load and set
R
ISO
from the plot of recommended R
ISO
vs capacitive
load. Low parasitic loads may not need an R
ISO
since the
OPA655 is nominally compensated to operate with a 5pF
parasitic load.
If a long trace is required and the 6dB signal loss intrinsic
to doubly terminated transmission lines is acceptable,
implement a matched impedance transmission line using
microstrip or stripline techniques (consult an ECL design
handbook for microstrip and stripline layout techniques).
A 50
environment is not necessary on board, and in fact
a higher impedance environment will improve distortion
as shown in the distortion vs load plot. With a character-
istic impedance defined based on board material and
desired trace dimensions, a matching series resistor into
the trace from the output of the amplifier is used as well
as a terminating shunt resistor at the input of the destina-
tion device; the total effective impedance should match
the trace impedance. Multiple destination devices are best
handled as separate transmission lines, each with their
own series and shunt terminations.
Socketing a high speed part like the OPA655 is not
recommended.
The additional lead length and pin-to-pin
capacitance introduced by the socket creates an extremely
troublesome parasitic network which can make it impos-
sible to achieve a smooth, stable response. Best results are
obtained by soldering the part onto the board. If socketing
for the DIP package is desired, high frequency flush
mount pins (e.g. McKenzie Technology No. 710C) can
give good results.
SPICE MODEL AND EVALUATION BOARDS
Computer simulation of circuit performance using SPICE is
often useful when analyzing the performance of analog
circuits and systems. This is particularly true for Video and
RF amplifier circuits where parasitic capacitance and induc-
tance can have a major effect on circuit performance. SPICE
models are available on a disk from the Burr-Brown Appli-
cations Department.
The OPA655 is similar in distortion performance and iden-
tical in pinout to the OPA642. The demonstration boards
developed for the OPA642 are recommended for the OPA655.
The six boards available are:
Contact your local Burr-Brown sales office or distributor to
order demonstration boards.
DEM-OPA64XP-F
8-pin DIP, unity gain follower configuration
DEM-OPA64XP-N
8-pin DIP, non-inverting gain configuration
DEM-OPA64XP-I
8-pin DIP, inverting gain configuration
DEM-OPA64XU-F
SO-8 Surface Mount, unity gain follower configuration
DEM-OPA64XU-N
SO-8 Surface Mount, non-inverting gain configuration
DEM-OPA64XU-I
SO-8 Surface Mount, inverting gain configuration
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PDF描述 |
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| OPA655P | Wideband, Unity Gain Stable, FET-Input OPERATIONAL AMPLIFIER |
| OPA655U | Wideband, Unity Gain Stable, FET-Input OPERATIONAL AMPLIFIER |
| OPA671AP | Wide Bandwidth, Fast Settling Difet OPERATIONAL AMPLIFIER |
| OPA671 | Wide Bandwidth, Fast Settling Difet OPERATIONAL AMPLIFIER |
| OPA683ID | OP-AMP|SINGLE|BIPOLAR|SOP|8PIN|PLASTIC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA655P | 制造商:BB 制造商全稱:BB 功能描述:Wideband, Unity Gain Stable, FET-Input OPERATIONAL AMPLIFIER |
| OPA655P | 制造商:Texas Instruments 功能描述:OP AMP WIDEBAND FET IP DIP8 655 |
| OPA655U | 功能描述:IC OPAMP VFB 240MHZ SGL WB 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產(chǎn)品變化通告:Discontinuation 18/May/2012 標(biāo)準(zhǔn)包裝:2,000 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.42 V/µs 增益帶寬積:1.5MHz -3db帶寬:- 電流 - 輸入偏壓:15nA 電壓 - 輸入偏移:1000µV 電流 - 電源:116µA 電流 - 輸出 / 通道:100mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5 V，±0.9 V ~ 2.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁面:851 (CN2011-ZH PDF) 其它名稱:296-20930-2 |
| OPA656 | 制造商:BB 制造商全稱:BB 功能描述:Precision, High-Speed Transimpedance Amplifier |
| OPA656-DIE | 制造商:TI 制造商全稱:Texas Instruments 功能描述:WIDEBAND, UNITY-GAIN STABLE, FET-INPUT OPERATIONAL AMPLIFIER |
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