REF200

GND

C

R

R

R

To RTD

To INA

REF200

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SBVS020B – SEPTEMBER 2000 – REVISED JULY 2015

9 Power Supply Recommendations

The REF200 device has completely floating current sources and current mirror. The REF200 device has a wide

compliance voltage range from 2.5 V to 40 V.

10 Layout

10.1 Layout Guidelines

Figure 42 illustrates an example of a printed-circuit-board (PCB) layout for a data acquisition system using the

REF2030. Some key considerations are:

•

Minimize trace lengths in the current source and current mirror paths to reduce impedance.

•

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.

•

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.

10.2 Layout Example

Figure 42. Example Layout of REF200 in a RTD Measurement System

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Product Folder Links: REF200