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| 型號： | OPA830ID |
| 英文描述： | Low-Power, Single-Supply, Wideband Operational Amplifier |
| 中文描述： | 低功耗，單電源，寬帶運算放大器 |
| 文件頁數(shù)： | 22/31頁 |
| 文件大小： | 460K |
| 代理商： | OPA830ID |
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SBOS263B AUGUST 2004 REVISED JANUARY 2005
www.ti.com
22
SINGLE-SUPPLY ACTIVE FILTER
The OPA830, while operating on a single +3V or +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 8
shows an example design of a 1MHz 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 1, 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 noninverting input is
intentionally set larger to dominate input parasitic terms. At
a gain of +4, the OPA830 on a single supply will show
30MHz 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 1MHz, 3dB point with a maximally-flat
passband (above the 32kHz AC-coupling corner), and a
maximum stop band attenuation of 36dB at the amplifier’s
3dB bandwidth of 30MHz.
DESIGN-IN TOOLS
DEMONSTRATION BOARDS
Several PC boards are available to assist in the initial
evaluation of circuit performance using the OPA830 in its
two package styles. Both of these are available, free, as
unpopulated PC boards delivered with descriptive
documentation. The summary information for these
boards is shown in Table 1.
Table 1. Demo Board Availability
PRODUCT
PACKAGE
DEMO BOARD
NUMBER
ORDERING
NUMBER
OPA830ID
SO-8
DEM
-
OPA68xU
SBOU009
OPA830IDBV
SOT23-5
DEM
-
OPA6xxN
SBOU010
Go to the TI web site (www.ti.com) to request evaluation
boards through the OPA830 product folder.
OPA830
1.5k
1.87k
500
+5V
1.87k
4V
I
V
I
150pF
0.1
μ
F
1MHz, 2ndOrder
Butterworth Filter
100pF
432
137
0.1
μ
F
Figure 8. Single-Supply, High-Frequency Active Filter
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA830ID | 制造商:Texas Instruments 功能描述:IC OP-AMP VFB 110MHZ SGL 8SOIC 制造商:Texas Instruments 功能描述:IC, OP-AMP VFB 110MHZ SGL 8SOIC 制造商:Texas Instruments 功能描述:IC, OP-AMP VFB 110MHZ SGL 8SOIC; Op Amp Type:Low Power; No. of Amplifiers:1; Slew Rate:500V/s; Supply Voltage Range: 1.4V to 5.5V; Amplifier Case Style:SOIC; No. of Pins:8; Bandwidth:250MHz; Operating Temperature Min:-40C; ;RoHS Compliant: Yes |
| OPA830IDBV | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Low-Power, Single-Supply, Wideband Operational Amplifier |
| OPA830IDBVR | 功能描述:高速運算放大器 OPA830: Low-Power Sngl-Sply Oper Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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 |
| OPA830IDBVRG4 | 功能描述:高速運算放大器 OPA830: Low-Power Sngl-Sply Oper Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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 |
| OPA830IDBVT | 功能描述:高速運算放大器 OPA830: Low-Power Sngl-Sply Oper Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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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