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MRF89XA Folha de dados(PDF) 16 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) 16 Page - Microchip Technology

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MRF89XA
DS70000622D-page 16
Preliminary
 2010-2017 Microchip Technology Inc.
2.4.4
IF GAIN AND SECOND I/Q MIXER
Following the LNA and first down-conversion, there is
an IF amplifier whose gain can be programmed from
13.5-0 dB in 4.5 dB steps, through the register
DMODREG.
For
more
information,
refer
to
Section 2.14.2, Data And Modulation Configuration
Register Details. The default setting corresponds to
0 dB gain, but lower values can be used to increase the
RSSI dynamic range.
2.4.5
CHANNEL FILTERS
The second mixer stages are followed by the channel
select filters. The channel select filters have a strong
influence on the noise bandwidth and selectivity of the
receiver, and therefore, its sensitivity. Each channel
select filter features a passive second-order RC filter,
with a programmable bandwidth, and the “fine” channel
selection is performed by an active, third-order,
Butterworth filter, which acts as a low-pass filter for the
zero-IF configuration (FSK), or a complex polyphase
filter for the low-IF (OOK) configuration. For more
information on configuring passive and active filters
see Section 3.4.4, Channel Filters.
2.5
Frequency Synthesizer Block
The frequency synthesizer of the MRF89XA is a fully
integrated integer-N type PLL. The crystal oscillator
provides the reference frequency for the PLL. The PLL
circuit requires only a minimum of five external
components for the PLL loop filter and the VCO tank
circuit.
Figure 2-4 illustrates a block schematic of the
MRF89XA PLL. The crystal reference frequency and
the software controlled dividers R, P, and S blocks
determine the output frequency of the PLL.
The VCO tank inductors are connected to an external
differential input. Similarly, the loop filter is also located
externally.
FIGURE 2-4:
FREQUENCY SYNTHESIZER BLOCK DIAGRAM
2.5.1
REFERENCE OSCILLATOR PINS
(OSC1/OSC2)
The MRF89XA has an internal, integrated oscillator
circuit, and the OSC1 and OSC2 pins are used to
connect to an external crystal resonator. The crystal
oscillator provides the reference frequency for the PLL.
The crystal oscillator circuit, with the required loading
capacitors, provides a 12.8-MHz reference signal for
the PLL. The PLL then generates the local oscillator
frequency. It is possible to “pull” the crystal to the
accurate frequency by changing the load capacitor
value. The crystal oscillator load capacitance is
typically 15 pF, which allows the crystal oscillator circuit
to accept a wide range of crystals.
Choosing a higher tolerance crystal results in a lower
TX to RX frequency offset and the ability to select a
smaller deviation in baseband bandwidth. Therefore,
the recommended crystal accuracy should be
 40
ppm. The guidelines for selecting the appropriate
crystal with specifications are explained in Section 4.7,
Crystal Specification and Selection Guidelines.
PFD
XO
(Ri + 1)
VCORS
OSC1
OSC2
PLLP
PLLN
VCOTN
VCOTP
LO
Vtune
FCOMP
75 * (Pi + 1) + Si
MRF89XA
Note:
Crystal frequency error directly translates
to carrier frequency (frf), bit rate, and
frequency deviation error.


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