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MCS3142 датащи(PDF) 24 Page - Microchip Technology

номер детали MCS3142
подробное описание детали  MCS3142 Dual KEELOQ짰 Technology Encoder Data Sheet
PDF  37 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCS3142 датащи(HTML) 24 Page - Microchip Technology

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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
22
—
26
MHz
CL
Load Capacitance
—
15
—
pF
ESR
Equivalent Series Resistance
—
—
100
Ω



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