12.1 Layout Guidelines

Figure 54 shows an example of a PCB layout for a data acquisition system using the REF1930. Some key considerations are:

• Connect low-ESR, 0.1-μF ceramic bypass capacitors at V_IN, V_REF, and V_BIAS of the REF1930.
• Decouple other active devices in the system per the device specifications.
• Using a solid ground plane helps distribute heat and reduces electromagnetic interference (EMI) noise pickup.
• Place the external components as close to the device as possible. This configuration prevents parasitic errors (such as the Seebeck effect) from occurring.
• Minimize trace length between the reference and bias connections to the INA and ADC to reduce noise pickup.
• Do not run sensitive analog traces in parallel with digital traces. Avoid crossing digital and analog traces if possible and only make perpendicular crossings when absolutely necessary.

12.2 Layout Example

Figure 54. Layout Example