MCP39F511 datasheet(13/62 Pages) MICROCHIP

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DS20005393B-page 13

MCP39F511

3.13

Noninverting Reference

Input/Internal Reference Output

Pin (REFIN+/OUT)

This pin is the noninverting side of the differential

voltage reference input for the Delta-Sigma ADCs or

the internal voltage reference output.

For optimal performance, bypass capacitances should

be connected between this pin and AGND at all times,

even when the internal voltage reference is used.

However, these capacitors are not mandatory to

ensure proper operation.

3.14

Digital Ground Connection Pins

(DGND)

DGND is the ground connection to internal digital

circuitry (SINC filters, oscillator, serial interface). If a

digital ground plane is available, it is recommended to

tie this pin to the digital plane of the PCB. This plane

should also reference all other digital circuitry in the

system.

3.15

Digital Power Supply Pin (DVDD)

DVDD is the power supply pin for the digital circuitry

within the MCP39F511. This pin requires appropriate

bypass capacitors and should be maintained between

+2.7V and +3.6V for specified operation. It is

recommended to use 0.1 µF ceramic capacitors.

3.16

Data-Ready Pin (DR)

The data-ready pin indicates if a new Delta-Sigma A/D

conversion result is ready to be processed. This pin is

for indication only and should be left floating. After each

conversion is finished, a low pulse will take place on the

data-ready pin to indicate the conversion result is ready

and an interrupt is generated in the calculation engine

(CE). This pulse is synchronous with the line frequency

to ensure an integer number of samples for each line

cycle.

3.17

Exposed Thermal Pad (EP)

This pin is the exposed thermal pad. It must be

connected to pin 24 (DGND).

Note:

This pin is internally connected to the IRQ

of the calculation engine and should be

left floating.

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