MCP960X datasheet(46/57 Pages) MICROCHIP

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DS20005426G-page 46

MCP960X/L0X/RL0X

6.3.4

ALIASING AND ANTI-ALIASING

FILTER

Aliasing occurs when the input signal contains time

varying signals with frequency greater than half the

sample rate. In the aliasing conditions, the ADC can

output unexpected codes. The ADC integrates a first

order sync filter; however, an external anti-aliasing filter

can provide an added filter for high noise applications.

This can be done with a simple RC low-pass filter at the

inputs, as shown in Figure 6-8. Open-circuit detection

resistors can also be added, as shown in Figure 6-9.

FIGURE 6-8:

Adding a Low-Pass Filter.

FIGURE 6-9:

Adding Open-Circuit

Detection Resistors with an Input Low-Pass

Filter (MCP9600/L00/RL00, see Section 6.3.3

“Open and Short Detection Circuits”).

FIGURE 6-10:

Adding Open-Circuit

Detection Resistors with an Input Low-Pass

Filter (MCP9601/L01/RL01).

6.3.5

ESD PROTECTION USING FERRITE

BEADS

Ferrite beads and Transient Voltage Suppression

(TVS) Diodes are highly recommended to protect the

MCP960X/L0X/RL0X and other devices from a high

frequency noise and ESD discharge through the

thermocouple wire. These additional components can

be added to the input channel as shown in Figure 6-11

and Figure 6-12.

FIGURE 6-11:

Adding Ferrite Beads

(MCP9600/L00/RL00).

FIGURE 6-12:

Adding Ferrite Beads

(MCP9601/L01/RL01).

Del Sig

VIN+

VIN-

Thermocouple

ADC Core

Del Sig

VIN+

VIN-

Thermocouple

VDD

MCP9600/L00/RL00

Del Sig

VIN+

VIN-

Thermocouple

VDD

VSENSE

MCP9601/L01/RL01

Del Sig

VIN+

VIN-

Thermocouple

VDD

MCP9600/L00/RL00

Del Sig

VIN+

VIN-

Thermocouple

RA VDD

VDD

MCP9601/L01/RL01

VSENSE

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