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OPA2690 Datasheet(PDF) 22 Page - Burr-Brown (TI) |
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OPA2690 Datasheet(HTML) 22 Page - Burr-Brown (TI) |
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22 / 31 page  OPA830 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 µF 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 Ω 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 ORDERING 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 Ω 1.87k Ω 500 Ω +5V 1.87k Ω 4V I V I 150pF 0.1 µF 1MHz, 2nd−Order Butterworth Filter 100pF 432 Ω 137 Ω 0.1 µF Figure 8. Single-Supply, High-Frequency Active Filter |
Similar Part No. - OPA2690 |
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Similar Description - OPA2690 |
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