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參數(shù)資料
| 型號： | OPA682P |
| 英文描述： | Wideband, Fixed Gain BUFFER AMPLIFIER With Disable |
| 中文描述： | 寬帶，固定增益緩沖放大器具有禁用 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 213K |
| 代理商： | OPA682P |
16
OPA682
PRECISION VOLTAGE BUFFER
The precision buffer in Figure 6 combines the DC precision
and low 1/f noise of the OPA227 with the high speed
performance of the OPA682. The 80.6k
resistor makes the
high frequency and low frequency nominal gains equal. The
OPA682 takes over from the OPA227 at approximately 32kHz.
DESIGN-IN TOOLS
DEMONSTRATION BOARDS
Several PC boards are available to assist in the initial
evaluation of circuit performance using the OPA682 in its
three package styles. All of these are available free as an
unpopulated PC board delivered with descriptive documen-
tation. The summary information for these boards is shown
in the table below.
OPERATING SUGGESTIONS
GAIN SETTING
Setting the gain with the OPA682 is very easy. For a gain of
+2, ground the –IN pin and drive the +IN pin with the signal.
For a gain of +1, leave the –IN pin open and drive the +IN
pin with the signal. For a gain of –1, ground the +IN pin and
drive the –IN pin with the signal. Since the internal resistor
values (but not their ratio) change significantly over tem-
perature and process, external resistors should not be used to
modify the gain.
OUTPUT CURRENT AND VOLTAGE
The OPA682 provides output voltage and current capabili-
ties that are unsurpassed in a low cost monolithic op amp.
Under no-load conditions at 25
°
C, the output voltage typi-
cally swings closer than 1V to either supply rail; the guaran-
teed swing limit is within 1.2V of either rail. Into a 15
load
(the minimum tested load), it is guaranteed to deliver more
than
±
135mA.
The specifications described above, though familiar in the
industry, consider voltage and current limits separately. In
many applications, it is the voltage x current, or V-I product,
which is more relevant to circuit operation. Refer to the
“Output Voltage and Current Limitations” plot in the Typical
Performance Curves. The X and Y axes of this graph show
the zero-voltage output current limit and the zero-current
output voltage limit, respectively. The four quadrants give a
more detailed view of the OPA682’s output drive capabili-
ties, noting that the graph is bounded by a “Safe Operating
Area” of 1W maximum internal power dissipation. Superim-
posing resistor load lines onto the plot shows that the
OPA682 can drive
±
2.5V into 25
or
±
3.5V into 50
without exceeding the output capabilities or the 1W dissipa-
tion limit. A 100
load line (the standard test circuit load)
shows the full
±
3.9V output swing capability, as shown in
the Typical Specifications.
The minimum specified output voltage and current over
temperature are set by worst-case simulations at the cold
temperature extreme. Only at cold startup will the output
current and voltage decrease to the numbers shown in the
guaranteed tables. As the output transistors deliver power,
their junction temperatures will increase, decreasing their
VBE’s (increasing the available output voltage swing) and
increasing their current gains (increasing the available out-
put current). In steady-state operation, the available output
voltage and current will always be greater than that shown in
the over-temperature specifications since the output stage
junction temperatures will be higher than the minimum
specified operating ambient.
To maintain maximum output stage linearity, no output
short-circuit protection is provided. This will not normally
be a problem since most applications include a series match-
ing resistor at the output that will limit the internal power
dissipation if the output side of this resistor is shorted to
ground. However, shorting the output pin directly to the
adjacent positive power supply pin will, in most cases,
destroy the amplifier. If additional short-circuit protection is
required, consider a small series resistor in the power supply
BOARD
PART
NUMBER
LITERATURE
REQUEST
NUMBER
PRODUCT
PACKAGE
OPA682P
OPA682U
OPA682N
8-Pin DIP
8-Lead SO-8
6-Lead SOT23-6
DEM-OPA68xP
DEM-OPA68xU
DEM-OPA68xN
MKT-350
MKT-351
MKT-348
Contact the Burr-Brown applications support line to request
any of these boards.
MACROMODELS AND APPLICATIONS SUPPORT
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. A
SPICE model for the OPA682 is available through the Burr-
Brown Internet web page (http://www.burr-brown.com).
These models do a good job of predicting small-signal AC
and transient performance under a wide variety of operating
conditions. They do not do as well in predicting the har-
monic distortions, temperature or dG/d
φ
characteristics. These
models do not attempt to distinguish between the package
types in their small-signal AC performance.
FIGURE 6. Precision Wideband, Unity Gain Buffer.
OPA227
OPA682
400
400
80.6k
200
V
IN
V
OUT
–5V
–5V
+5V
+5V
200
2.7nF
2.7nF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA686U | Wideband, Low Noise, Voltage Feedback OPERATIONAL AMPLIFIER |
| OPA686N | Wideband, Low Noise, Voltage Feedback OPERATIONAL AMPLIFIER |
| OPA686 | Wideband, Low Noise, Voltage Feedback OPERATIONAL AMPLIFIER |
| OPA687N | Wideband, Ultra-Low Noise, Voltage Feedback OPERATIONAL AMPLIFIER With Power Down |
| OPA687U | Wideband, Ultra-Low Noise, Voltage Feedback OPERATIONAL AMPLIFIER With Power Down |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA682U | 功能描述:高速運(yùn)算放大器 Wb Fixed Gain 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 |
| OPA682U/2K5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Buffer/Voltage Follower |
| OPA683 | 制造商:BB 制造商全稱:BB 功能描述:Wideband, Low-Power, Current Feedback Operational Amplifier |
| OPA683ID | 功能描述:高速運(yùn)算放大器 Very Lo-Pwr Current Feedback 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 |
| OPA683IDBVR | 功能描述:高速運(yùn)算放大器 Very Lo-Pwr Current Feedback 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 |
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