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MRF89XA 数据表(PDF) 14 Page - Microchip Technology

部件名 MRF89XA
功能描述  Ultra Low-Power, Integrated ISM BandSub-GHz Transceiver
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MRF89XA 数据表(HTML) 14 Page - Microchip Technology

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MRF89XA
DS70000622D-page 14
Preliminary
 2010-2017 Microchip Technology Inc.
2.1
Power Supply and Ground Block
Pins
To
provide
stable
sensitivity
and
linearity
characteristics over a wide supply range, the
MRF89XA is internally voltage regulated. This internal
regulated power supply block structure is illustrated in
Figure 2-2.
The power supply bypassing is essential for better
handling of signal surges and noise in the power line.
To ensure correct operation of the regulator circuit, the
decoupling capacitor connection (shown in Figure 2-2)
is recommended. These decoupling components are
recommended for any design. The power supply block
generates four regulated supplies for the analog,
digital, VCO, and the PLL blocks to reduce the voltages
for their specific requirements. However, Power-on
Reset (POR), Configuration registers, and the SPI use
the VDD supply given to the MRF89XA.
The large value decoupling capacitors should be
placed at the PCB power input. The smaller value
decoupling capacitors should be placed at every power
point of the device and at bias points for the RF port.
Poor bypassing can lead to conducted interference,
which can cause noise and spurious signals to couple
into the RF sections, thereby significantly reducing the
performance.
It is recommended that the VDD pin have two bypass
capacitors to ensure sufficient bypass and decoupling.
However, based on the selected carrier frequency, the
bypass capacitor values vary. The trace length (VDD pin
to bypass capacitors) should be made as short as
possible.
FIGURE 2-2:
POWER SUPPLY BLOCK DIAGRAM
TABLE 2-2:
POWER SUPPLY PIN DETAILS
Blocks
Biasing Through
Associated Pins
Regulated Voltage
(in Volts)
POR, SPI and Configuration Registers
VDD
VDD
2.1–3.6
Regulated Supply (VINTS)VDD
VDD
1.4
Analog
VINTS
AVRS
1.0
Digital
VINTS
DVRS
1.0
VCO
VINTS
VCORS
0.85
PA
VDD
PARS
1.8
VDD – Pin 26
2.1 – 3.6V
External Supply
Internal Regulator
1.4 V
Digital Regulator
1.0 V
VCO Regulator
0.85 V
PA Regulator
1.80 V
VCORS
Pin 3
PARS
Pin 29
Biasing:
- PA Driver
- Ext. PA Choke
Biasing:
- VCO Circuit
- Ext. VCO Tank
Biasing Digital
Blocks
DVRS
Pin 28
Biasing Analog
Blocks
AVRS
Pin 27
Analog Regulator
1.0 V
Biasing:
- SPI
- Config. Registers
- POR
1 µF
Y5V
1 µF
Y5V
0.22 µF
X7R
0.1 µF
X7R
0.047 µF
X7R
VBAT
VINTS


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