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參數(shù)資料
| 型號： | AD842KN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Wideband, High Output Current, Fast Settling Op Amp |
| 中文描述： | OP-AMP, 1500 uV OFFSET-MAX, 80 MHz BAND WIDTH, PDIP14 |
| 封裝： | PLASTIC, DIP-14 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 475K |
| 代理商： | AD842KN |
AD842
–
8
–
REV. E
GROUNDING AND BYPASSING
In designing practical circuits with the AD842, the user must
remember that whenever high frequencies are involved, some
Figure 24. AD842 Settling Demonstrating No Settling
Tails
special precautions are in order. Circuits must be built with
short interconnect leads. Large ground planes should be used
whenever possible to provide a low resistance, low inductance
circuit path, as well as minimizing the effects of high frequency
coupling. Sockets should be avoided because the increased
interlead capacitance can degrade bandwidth.
Feedback resistors should be of low enough value to assure that
the time constant formed with the circuit capacitances will not
limit the amplifier performance. Resistor values of less than
5 k
are recommended. If a larger resistor must be used, a small
(<10 pF) feedback capacitor connected in parallel with the feed-
back resistor, R
F
, may be used to compensate for these stray
capacitances and optimize the dynamic performance of the
amplifier in the particular application.
Power supply leads should be bypassed to ground as close as
possible to the amplifier pins. A 2.2
μ
F capacitor in parallel with
a 0.1
μ
F ceramic disk capacitor is recommended.
CAPACITIVE LOAD DRIVING ABILITY
Like all wideband amplifiers, the AD842 is sensitive to capaci-
tive loading. The AD842 is designed to drive capacitive loads of
up to 20 pF without degradation of its rated performance. Ca-
pacitive loads of greater than 20 pF will decrease the dynamic
performance of the part although instability should not occur
unless the load exceeds 100 pF.
USING A HEAT SINK
The AD842 draws less quiescent power than most precision
high speed amplifiers and is specified for operation without a
heat sink. However, when driving low impedance loads, the cur-
rent to the load can be 10 times the quiescent current. This will
create a noticeable temperature rise. Improved performance can
be achieved by using a small heat sink such as the Aavid Engi-
neering #602B.
TERMINATED LINE DRIVER
The AD842 is optimized for high speed line driver applications.
Figure 25 shows the AD842 driving a doubly terminated cable
in a gain-of-2 follower configuration. The AD842 maintains a
typical slew rate of 375 V/
μ
s, which means it can drive a
±
10 V,
6.0 MHz signal or a
±
3 V, 19.9 MHz signal.
The termination resistor, R
T
, (when equal to the characteristic
impedance of the cable) minimizes reflections from the far end
of the cable. A back-termination resistor (R
BT
, also equal to the
characteristic impedance of the cable) may be placed between
the AD842 output and the cable in order to damp any stray
signals caused by a mismatch between R
T
and the cable’s char-
acteristic impedance. This will result in a “cleaner” signal. With
this circuit, the voltage on the line equals V
IN
because one half
of V
OUT
is dropped across R
BT
.
The AD842 has
±
100 mA minimum output current and, there-
fore, can drive
±
5 V into a 50
cable.
The feedback resistors, R1 and R2, must be chosen carefully.
Large value resistors are desirable in order to limit the amount
of current drawn from the amplifier output. But large resistors
can cause amplifier instability because the parallel resistance
R1 R2 combines with the input capacitance (typically 2–5 pF) to
create an additional pole. Also, the voltage noise of the AD842
is equivalent to a 5 k
resistor, so large resistors can signifi-
cantly increase the system noise. Resistor values of 1 k
or 2 k
are recommended.
If termination is not used, cables appear as capacitive loads and
can be decoupled from the AD842 by a resistor in series with
the output.
AD842
–
TERMINATION
RESISTOR FOR
INPUT SIGNAL
V
IN
+V
S
0.1 F
2.2 F
–
V
S
0.1 F
2.2 F
R2
R1
R
ST
50 OR 75
CABLE
R
T
R
T
= R
ST
= CABLE CHARACTERISTIC
IMPEDANCE
+
Figure 25. Line Driver Configuration
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD842SCHIPS | Wideband, High Output Current, Fast Settling Op Amp |
| AD842SH | Wideband, High Output Current, Fast Settling Op Amp |
| AD842SQ | Wideband, High Output Current, Fast Settling Op Amp |
| AD842JQ | Wideband, High Output Current, Fast Settling Op Amp |
| AD842KQ | Wideband, High Output Current, Fast Settling Op Amp |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD842KNZ | 功能描述:IC OPAMP GP 80MHZ 100MA 14DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 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-SOIC 包裝:帶卷 (TR) |
| AD842KQ | 功能描述:IC OPAMP GP 80MHZ 100MA 14CDIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 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-SOIC 包裝:帶卷 (TR) |
| AD842SCHIPS | 制造商:AD 制造商全稱:Analog Devices 功能描述:Wideband, High Output Current, Fast Settling Op Amp |
| AD842SE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| ad842se/883b | 制造商:Analog Devices 功能描述:OP AMP SGL GP 18V 20PIN LCC - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:HIGH OUTPUT CURRENT AMP - Bulk |
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