MCP3204 datasheet(23/40 Pages) MICROCHIP

23 / 40 page

DS21298E-page 23

MCP3204/3208

FIGURE 6-3:

The MCP601 Operational Amplifier is used to implement a second order anti-aliasing

filter for the signal being converted by the MCP3204.

6.4

Layout Considerations

When laying out a printed circuit board for use with

analog components, care should be taken to reduce

noise wherever possible. A bypass capacitor should

always be used with this device, placed as close as

possible to the device pin. A bypass capacitor value of

1 µF is recommended.

Digital and analog traces should be separated as much

as possible on the board, with no traces running

underneath the device or the bypass capacitor. Extra

precautions should be taken to keep traces with high

frequency signals (such as clock lines) as far as

possible from analog traces.

Use of an analog ground plane is recommended in

order to keep the ground potential the same for all

devices on the board. Providing VDD connections to

devices in a “star” configuration can also reduce noise

by eliminating return current paths and associated

errors (see Figure 6-4). For more information on layout

tips when using A/D converters, refer to AN688,

“Layout Tips for 12-Bit A/D converter Applications”

FIGURE 6-4:

DD traces arranged in a

‘Star’ configuration in order to reduce errors

caused by current return paths.

MCP3204

VDD

10 µF

IN-

IN+

VIN

VREF

4.096V

Reference

1µF

0.1 µF

MCP601

MCP1541

Connection

Device 1

Device 2

Device 3

Device 4

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