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MRF89XA Folha de dados(PDF) 60 Page - Microchip Technology

Nome de Peças MRF89XA
Descrição Electrónicos  Ultra Low-Power, Integrated ISM BandSub-GHz Transceiver
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Fabricante Electrônico  MICROCHIP [Microchip Technology]
Página de início  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MRF89XA Folha de dados(HTML) 60 Page - Microchip Technology

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MRF89XA
DS70000622D-page 60
Preliminary
 2010-2017 Microchip Technology Inc.
3.3.6
POWER AMPLIFIER
3.3.6.1
Rise and Fall Time Control
In OOK mode, the PA ramp times can be accurately
controlled
through
the
PARC<1:0>
bits
(PACONREG<4:3>). These bits directly control the slew
rate of the PARS pin.
TABLE 3-2:
POWER AMPLIFIER RISE/
FALL TIMES
3.3.7
TRANSMIT MODE REGISTERS
The registers associated with the Transmit mode are:
• GCONREG (Register 2-1)
•DMODREG (Register 2-2)
•FDEVREG (Register 2-3)
• BRSREG (Register 2-4)
•R1CREG (Register 2-7)
• P1CREG (Register 2-8)
• S1CREG (Register 2-9)
•R2CREG (Register 2-10)
• P2CREG (Register 2-11)
• S2CREG (Register 2-12)
• PACREG (Register 2-13)
• FTXRXIREG (Register 2-14)
• FTPRIREG (Register 2-15)
During the Transmit mode of the MRF89XA, the Shift
register takes bytes from the FIFO and outputs them
serially (MSb first) at the programmed bit rate to the
modulator. When the transmitter is enabled, it starts
sending out data from the Shift register with respect to
the set bit rate. After power-up and with the Transmit
registers enabled, the transmitter preloads the FIFO
with preambles before sending the actual data based
on the mode of operation. Figure 3-4 illustrates the PA
Control Timing.
FIGURE 3-4:
PA TIMING CONTROL
PARC<1:0>
tPARS
tPAOUT
(rise/fall)
00
3 µs
2.5/2 µs
01
8.5 µs
5/3 µs
10
15 µs
10/6 µs
11
23 µs
20/10 µs
DATA
PARS
[V]
95%
tPARS
tPARS
95%
60 dB
60 dB
PA Output
Power
tPA_OUT
tPA_OUT


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