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LMH6643MMX Datasheet(PDF) 18 Page - National Semiconductor (TI) |
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LMH6643MMX Datasheet(HTML) 18 Page - National Semiconductor (TI) |
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18 / 22 page  Application Notes (Continued) For this example, optimum C f was empirically determined to be around 5pF. This time domain response is shown in Figure 4 below showing about 9ns rise/fall times, corre- sponding to about 39MHz for f p. The overall supply current from the +5V supply is around 5mA with no load. Printed Circuit Board Layout and Component Values Sections: Generally, a good high frequency layout will keep power supply and ground traces away from the inverting input and output pins. Parasitic capacitances on these nodes to ground will cause frequency response peaking and possible circuit oscillations (see Application Note OA-15 for more information). National Semiconductor suggests the following evaluation boards as a guide for high frequency layout and as an aid in device testing and characterization: Device Package Evaluation Board PN LMH6642MF SOT23-5 CLC730068 LMH6642MA 8-Pin SOIC CLC730027 LMH6643MA 8-Pin SOIC CLC730036 LMH6643MM 8-Pin MSOP CLC730123 LMH6644MA 14-Pin SOIC CLC730031 LMH6644MT 14-Pin TSSOP CLC730131 These free evaluation boards are shipped when a device sample request is placed with National Semiconductor. Another important parameter in working with high speed/ high performance amplifiers, is the component values selec- tion. Choosing external resistors that are large in value will effect the closed loop behavior of the stage because of the interaction of these resistors with parasitic capacitances. These capacitors could be inherent to the device or a by- product of the board layout and component placement. Ei- ther way, keeping the resistor values lower, will diminish this interaction to a large extent. On the other hand, choosing very low value resistors could load down nodes and will contribute to higher overall power dissipation. Ordering Information Package Part Number Package Marking Transport Media NSC Drawing 5-Pin SOT-23 LMH6642MF A64A 1k Units Tape and Reel MF05A LMH6642MFX 3k Units Tape and Reel SOIC-8 LMH6642MA LMH6642MA Rails M08A LMH6642MAX 2.5k Units Tape and Reel LMH6643MA LMH6643MA Rails LMH6643MAX 2.5k Units Tape and Reel MSOP-8 LMH6643MM A65A 1k Units Tape and Reel MUA08A LMH6643MMX 3.5k Units Tape and Reel SOIC-14 LMH6644MA LMH6644MA Rails M14A LNH6644MAX 2.5k Units Tape and Reel TSSOP-14 LMH6644MT LMH6644MT Rails MTC14 LMH6644MTX 2.5k Units Tape and Reel 20018565 FIGURE 4. Converter Step Response (1V PP, 20 ns/DIV) www.national.com 18 |
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