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LM2904-Q1 Datasheet(PDF) 23 Page - Texas Instruments |
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LM2904-Q1 Datasheet(HTML) 23 Page - Texas Instruments |
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23 / 38 page  12 Layout 12.1 Layout Guidelines For best operational performance of the device, use good PCB layout practices, including: • Noise can propagate into analog circuitry through the power pins of the circuit as a whole, as well as the operational amplifier. Bypass capacitors are used to reduce the coupled noise by providing low-impedance power sources local to the analog circuitry. – Connect low-ESR, 0.1-µF ceramic bypass capacitors between each supply pin and ground, placed as close to the device as possible. A single bypass capacitor from V+ to ground is applicable for single- supply applications. • Separate grounding for analog and digital portions of circuitry is one of the simplest and most-effective methods of noise suppression. One or more layers on multilayer PCBs are usually devoted to ground planes. A ground plane helps distribute heat and reduces EMI noise pickup. Make sure to physically separate digital and analog grounds, paying attention to the flow of the ground current. • To reduce parasitic coupling, run the input traces as far away from the supply or output traces as possible. If it is not possible to keep them separate, it is much better to cross the sensitive trace perpendicular as opposed to in parallel with the noisy trace. • Place the external components as close to the device as possible. Keeping RF and RG close to the inverting input minimizes parasitic capacitance, as shown in Section 12.2. • Keep the length of input traces as short as possible. Always remember that the input traces are the most sensitive part of the circuit. • Consider a driven, low-impedance guard ring around the critical traces. A guard ring can significantly reduce leakage currents from nearby traces that are at different potentials. 12.2 Layout Examples OUT1 OUT2 IN1 í IN1+ V í V+ IN2 í IN2+ RG RIN RF GND VIN VS í GND VS+ GND Run the input traces as far away from the supply lines as possible Only needed for dual-supply operation Place components close to device and to each other to reduce parasitic errors Use low-ESR, ceramic bypass capacitor (or GND for single supply) Ground (GND) plane on another layer Figure 12-1. Operational Amplifier Board Layout for Noninverting Configuration + RIN RG RF VOUT VIN Figure 12-2. Operational Amplifier Schematic for Noninverting Configuration www.ti.com LM2904-Q1, LM2904B-Q1 SLOS414J – MAY 2003 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 23 Product Folder Links: LM2904-Q1 LM2904B-Q1 |
Similar Part No. - LM2904-Q1_V04 |
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Similar Description - LM2904-Q1_V04 |
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