DVR datasheet(31/416 Pages) MICROCHIP

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DS30010118D-page 31

PIC24FJ256GA705 FAMILY

2.4

Voltage Regulator Pin (VCAP)

Refer to Section 29.3 “On-Chip Voltage Regulator”

for details on connecting and using the on-chip

regulator.

A low-ESR (< 5Ω) capacitor is required on the VCAP pin

to stabilize the voltage regulator output voltage. The

VCAP pin must not be connected to VDD and must use a

capacitor of 10 µF connected to ground. The type can be

ceramic or tantalum. Suitable examples of capacitors

are shown in Table 2-1. Capacitors with equivalent

specifications can be used.

Designers may use Figure 2-3 to evaluate the ESR

equivalence of candidate devices.

The placement of this capacitor should be close to VCAP.

It is recommended that the trace length not exceed

0.25 inch (6 mm). Refer to Section 32.0 “Electrical

Characteristics” for additional information.

FIGURE 2-3:

FREQUENCY vs. ESR

PERFORMANCE FOR

SUGGESTED VCAP

Note:

This section applies only to PIC24FJ

devices with an on-chip voltage regulator.

0.1

0.01

0.001

0.01

0.1

100

1000 10,000

Frequency (MHz)

Note: Typical data measurement at +25°C, 0V DC bias.

TABLE 2-1:

SUITABLE CAPACITOR EQUIVALENTS (0805 CASE SIZE)

Make

Part #

Nominal

Capacitance

Base Tolerance

Rated Voltage

TDK

C2012X5R1E106K085AC

10 µF

±10%

25V

TDK

C2012X5R1C106K085AC

10 µF

±10%

16V

Kemet

C0805C106M4PACTU

10 µF

±10%

16V

Murata

GRM21BR61E106KA3L

10 µF

±10%

25V

Murata

GRM21BR61C106KE15

10 µF

±10%

16V

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