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LM397MFX bảng dữ liệu(PDF) 11 Page - Texas Instruments |
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LM397MFX bảng dữ liệu(HTML) 11 Page - Texas Instruments |
11 / 19 page IN+ IN- V± V+ OUT VS+ GND GND Only needed for dual-supply operation OUT IN- IN+ Run the input traces as far away from the supply lines as possible Use low-ESR, ceramic bypass capacitor VS± or GND LM397 www.ti.com SNOS977E – MAY 2001 – REVISED OCTOBER 2015 9 Power Supply Recommendations Place 0.1- μF bypass capacitors close to the power-supply pins to reduce errors coupling in from noisy or high impedance power supplies. For more detailed information on bypass capacitor placement; see the Layout Guidelines section. 10 Layout 10.1 Layout Guidelines Comparators are very sensitive to input noise. For best results, maintain the following layout guidelines: • Use a printed-circuit-board (PCB) with a good, unbroken low-inductance ground plane. Proper grounding (use of ground plane) helps maintain specified performance of the LM397. • To minimize supply noise, place a decoupling capacitor (0.1- μF ceramic, surface-mount capacitor) as close as possible to VS as shown in Figure 12. • On the inputs and the output, keep lead lengths as short as possible to avoid unwanted parasitic feedback around the comparator. Keep inputs away from the output. • Solder the device directly to the PCB rather than using a socket. • For slow-moving input signals, take care to prevent parasitic feedback. A small capacitor (1000 pF or less) placed between the inputs can help eliminate oscillations in the transition region. This capacitor causes some degradation to propagation delay when the impedance is low. Run the top-side ground plane between the output and inputs. • Run the ground pin ground trace under the device up to the bypass capacitor, shielding the inputs from the outputs. 10.2 Layout Example Figure 12. Comparator Board Layout Copyright © 2001–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM397 |
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