MCS3142-ISLASHST datasheet(24/37 Pages) MICROCHIP

24 / 37 page

MCS3142

DS40001747A-page 24

 2014 Microchip Technology Inc.

6.4.2

CRYSTAL SELECTION

Once the frequency band has been selected, the choice

of crystal frequency is flexible provided the crystal

meets the specifications summarized in Table 6-3, the

boundaries of the Encoder Frequency Configuration

value are followed and the RF transmit frequency error

is acceptable to the system design.

6.4.3

FREQUENCY CALCULATION

Once the frequency band and crystal frequency are

selected, the transmit frequency is calculated by setting

the Encoder Frequency Configuration bits according to

the formula shown in Table 6-2. If the calculated value

for Encoder Frequency Configuration is not an integer,

there will be an associated transmit frequency error.

6.4.4

POWER OUTPUT

The RF output power is configurable to either +0 dBm

or +10 dBm (typical). This option is configurable for

each encoder. See Table 3-7 for the Classic KEELOQ

encoder and Table 3-15 for the Ultimate KEELOQ

encoder.

TABLE 6-3:

CRYSTAL RESONATOR SPECIFICATIONS

Symbol

Description

Min.

Typ.

Max.

Unit

fREF

Crystal Frequency

—

MHz

Load Capacitance

—

ESR

Equivalent Series Resistance

—

100

Ω

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