For best operational performance of the device,
use good printed circuit board (PCB) layout practices, including the following
guidelines:
- Noise can propagate into analog circuitry
through the power pins of the circuit as a whole or through 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.
- The TLVx365 is capable of peak output current (in excess of 50 mA).
Applications with low impedance loads or capacitive loads with fast transient signals
demand large currents from the power supplies. Larger bypass capacitors, such as 1-µF
solid tantalum capacitors, can improve dynamic performance in these 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 these traces
cannot be kept separate, crossing the sensitive trace perpendicular is much better as
opposed to in parallel with the noisy trace.
- Place the external components as close to
the device as possible. Figure 8-8 shows that keeping RF and RG close to the inverting input
minimizes parasitic capacitance.
- 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.