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OPA2690I-14D Datasheet(PDF) 18 Page - Burr-Brown (TI) |
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OPA2690I-14D Datasheet(HTML) 18 Page - Burr-Brown (TI) |
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18 / 30 page  OPA2690 SBOS238D − JUNE 2002 − REVISED DECEMBER 2004 www.ti.com 18 The frequency response for a 10MHz Butterworth filter is shown in Figure 10. One advantage for using this type of filter is the independent setting of WO and Q. Q can be easily adjusted by changing the R3A, B resistors without affecting WO. Frequency (MHz) 0.1 1 10 20 1 0 −1 −2 −3 −4 −5 −6 −7 −8 −9 Figure 10. Multiple Feedback Filter Frequency Response SINGLE-SUPPLY DIFFERENTIAL ADC DRIVER The single-supply differential ADC driver shown on the front page is ideal for driving high-frequency ADCs. As shown in the plot on the front page, Harmonic Distortion vs Frequency for the Single-Supply Differential ADC Driver, the 2nd-harmonic reacts as expected and drops to a −95dBc at 1MHz and −87dBc at 5MHz—a significant improvement in going to differential from single-ended. The circuit shown on the front page has a 195MHz, −3dB bandwidth that can be easily bandlimited by using a capacitor in parallel with the feedback resistors. Refer to Figure 11 for more details. The −3dB frequency is given by Equation 5. f*3dB + 1 2 pR FCF Frequency (MHz) 9 6 3 0 −3 −6 −9 −12 0.1 10 1500 100 C F =8.6pF Figure 11. Single-Supply Differential ADC Driver For example, CF = 8.6pF in parallel with RF = 402Ω will control the −3dB frequency to 18MHz. DESIGN-IN TOOLS DEMONSTRATION BOARDS Several PC boards are available to assist in the initial evaluation of circuit performance using the OPA2690 in its two package styles. Both of these are available, free, as unpopulated PC boards delivered with descriptive documentation. The summary information for each board is shown below: PRODUCT PACKAGE BOARD PART NUMBER LITERATURE REQUEST NUMBER OPA2690ID SO-8 DEM-OPA268xU SBOU003 OPA2690IDBV SO-14 DEM-OPA268xN SBOU002 Consult the Texas Instruments web site (www.ti.com) to request either of these boards. (5) |
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