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OPA651U Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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OPA651U Datasheet(HTML) 10 Page - Burr-Brown (TI) |
10 / 11 page 10 OPA651 ® DISTORTION The OPA651’s harmonic distortion characteristics into a 100 Ω load are shown versus frequency and power output in the typical performance curves. Distortion can be signifi- cantly improved by increasing the load resistance as illus- trated in Figure 5. Remember to include the contribution of the feedback network when calculating the effective load resistance seen by the amplifier. 10 100 1k –50 –55 –60 –65 –70 –75 –80 3fo 2fo G = +2 Load Resistance ( Ω) FIGURE 5. 5MHz Harmonic Distortion vs Load Resistance. NOISE FIGURE The OPA651 voltage noise spectral density is specified in the Typical Performance Curves. For RF applications, how- ever, Noise Figure (NF) is often the preferred noise specifi- cation since it allows system noise performance to be more easily calculated. The OPA651’s Noise Figure vs Source Resistance is shown in Figure 6. NOISE FIGURE vs SOURCE RESISTANCE Source Resistance ( Ω) 30 25 20 15 10 5 0 10 100 1k 100k 10k NF = 10 LOG 1 + e n 2 + (I nRS) 2 4KTR S FIGURE 6. Noise Figure vs Source Resistance. SPICE MODELS AND EVALUATION BOARD 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. SPICE models are available on a disk from the Burr-Brown Appli- cations Department. Demonstration boards are available for each OPA651 pack- age style. These boards implement a very low parasitic layout that will produce the excellent frequency and pulse responses shown in the Typical Performance Curves. For each package style, the recommended demonstration board is: Contact your local Burr-Brown sales office or distributor to order demonstration boards. BOARD LITERATURE PART REQUEST PRODUCT PACKAGE NUMBER NUMBER OPA651P 8-Pin DIP DEM-OPA65xP — OPA651U 8-Pin SO-8 DEM-OPA65xU — OPA651N 6-Pin SOT23-6 DEM-OPA6xxN MKT-348 OPA651 V OUT 402 Ω 402 Ω Video Input 75 Ω 75 Ω 75 Ω Transmission Line 75 Ω TYPICAL APPLICATION FIGURE 7. Low Distortion Video Amplifier. |
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Similar Description - OPA651U |
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