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)： 14/21頁(yè)
文件大?。?/td> 235K
代理商： OPA680
14
OPA680
FIGURE 7. Single-Supply, High Frequency Active Filter.
SINGLE-SUPPLY ACTIVE FILTERS
The high bandwidth provided by the OPA680, while oper-
ating on a single +5V supply, lends itself well to high
frequency active filter designs. Again, the key additional
requirement is to establish the DC operating point of the
signal near the supply midpoint for highest dynamic range.
Figure 7 shows an example design of a 5MHz low pass
Butterworth filter using the Sallen-Key topology.
Both the input signal and the gain setting resistor are AC-
coupled using 0.1
μ
F blocking capacitors (actually giving
bandpass response with the low frequency pole set to 32kHz
for the component values shown). As discussed for Figure 2,
this allows the midpoint bias formed by the two 1.87k
resistors to appear at both the input and output pins. The
midband signal gain is set to +4 (12dB) in this case. The
capacitor to ground on the non-inverting input is intention-
ally set larger to dominate input parasitic terms. At a gain of
+4, the OPA680 on a single supply will show ~80MHz
small and large signal bandwidth. The resistor values have
been slightly adjusted to account for this limited bandwidth
in the amplifier stage. Tests of this circuit show a precise
5MHz, –3dB point with a maximally flat passband (above
the 32kHz AC-coupling corner), and a maximum stopband
attenuation of 36dB at the amplifier’s –3dB bandwidth of
80MHz.
DESIGN-IN TOOLS
DEMONSTRATION BOARDS
Several PC boards are available to assist in the initial evalu-
ation of circuit performance using the OPA680 in its three
package styles. All of these are available free as an
unpopulated PC board delivered with descriptive documenta-
tion. The summary information for these boards is shown
below:
OPA680
1.5k
432
137
500
1.87k
1.87k
V
I
+5V
DIS
0.1μF
150pF
0.1μF
100pF
4
V
I
5MHz, 2nd-Order
Butterworth Filter
BOARD
PART
NUMBER
LITERATURE
REQUEST
NUMBER
PRODUCT
PACKAGE
OPA680P
OPA680U
OPA680N
8-Pin DIP
8-Pin SO-8
6-Pin SOT23-6
DEM-OPA68xP
DEM-OPA68xU
DEM-OPA6xxN
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 OPA680 is available through either the
Burr-Brown Internet web page (http://www.burr-brown.com)
or as one model on a disk from the Burr-Brown Applications
Department (1-800-548-6132). The Application Department
is also available for design assistance at this number. 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 distortion or dG/dP characteristics. These models do
not attempt to distinguish between the package types in their
small-signal AC performance.
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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