參數(shù)資料
型號(hào)： OPA680
英文描述： Wideband, Voltage Feedback OPERATIONAL AMPLIFIER With Disable TM
中文描述： 寬帶，電壓反饋運(yùn)算放大器，禁用商標(biāo)
文件頁(yè)數(shù)： 21/21頁(yè)
文件大小： 235K
代理商： OPA680
21
OPA680
unloaded phase margin) If a long trace is required, and the
6dB signal loss intrinsic to a doubly terminated transmission
line is acceptable, implement a matched impedance trans-
mission line using microstrip or stripline techniques (consult
an ECL design handbook for microstrip and stripline layout
techniques). A 50
environment is normally not necessary
on board, and in fact, a higher impedance environment will
improve distortion as shown in the distortion versus load
plots. With a characteristic board trace impedance defined
(based on board material and trace dimensions), a matching
series resistor into the trace from the output of the OPA680
is used as well as a terminating shunt resistor at the input of
the destination device. Remember also that the terminating
impedance will be the parallel combination of the shunt
resistor and the input impedance of the destination device;
this total effective impedance should be set to match the
trace impedance. The high output voltage and current capa-
bility of the OPA680 allows multiple destination devices to
be handled as separate transmission lines, each with their
own series and shunt terminations. If the 6dB attenuation of
a doubly terminated transmission line is unacceptable, a
long trace can be series-terminated at the source end only.
Treat the trace as a capacitive load in this case and set the
series resistor value as shown in the plot of Recommended
R
S
vs Capacitive Load. This will not preserve signal integ-
rity as well as a doubly terminated line. If the input imped-
ance of the destination device is low, there will be some
signal attenuation due to the voltage divider formed by the
series output into the terminating impedance.
e)
Socketing a high speed part like the OPA680 is not
recommended.
The additional lead length and pin-to-pin
capacitance introduced by the socket can create an ex-
tremely troublesome parasitic network which can make it
almost impossible to achieve a smooth, stable frequency
response. Best results are obtained by soldering the OPA680
onto the board. If socketing for the DIP package is desired,
high frequency flush mount pins (e.g., McKenzie Technol-
ogy #710C) can give good results.
INPUT AND ESD PROTECTION
The OPA680 is built using a very high speed complemen-
tary bipolar process. The internal junction breakdown volt-
ages are relatively low for these very small geometry de-
vices. These breakdowns are reflected in the Absolute Maxi-
mum Ratings table. All device pins are protected with
internal ESD protection diodes to the power supplies as
shown in Figure 15.
These diodes provide moderate protection to input overdrive
voltages above the supplies as well. The protection diodes
can typically support 30mA continuous current. Where higher
currents are possible (e.g., in systems with
±
15V supply
parts driving into the OPA680), current-limiting series resis-
tors should be added into the two inputs. Keep these resistor
values as low as possible since high values degrade both
noise performance and frequency response.
FIGURE 15. Internal ESD Protection.
External
Pin
+V
CC
–V
CC
Internal
Circuitry
相關(guān)PDF資料
PDF描述
OPA680N Wideband, Voltage Feedback OPERATIONAL AMPLIFIER With Disable TM
OPA680P Wideband, Voltage Feedback OPERATIONAL AMPLIFIER With Disable TM
OPA681U Wideband, Current Feedback OPERATIONAL AMPLIFIER With Disable
OPA681 Wideband, Current Feedback OPERATIONAL AMPLIFIER With Disable
OPA681N Wideband, Current Feedback OPERATIONAL AMPLIFIER With Disable
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OPA680N 制造商:BB 制造商全稱:BB 功能描述:Wideband, Voltage Feedback OPERATIONAL AMPLIFIER With Disable TM
OPA680N/250 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier
OPA680N/3K 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier
OPA680P 功能描述:高速運(yùn)算放大器 Wideband V Feedb RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
OPA680U 制造商:BB 制造商全稱:BB 功能描述:EVALUATION FIXTURE
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