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| 型号： | RFPIC12F675K-E/SS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDSO20 |
| 封装： | 0.209 INCH, PLASTIC, MO-150, SSOP-20 |
| 文件页数： | 71/123页 |
| 文件大小： | 5438K |
| 代理商： | RFPIC12F675K-E/SS |
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2003 Microchip Technology Inc.
Preliminary
DS70091A-page 49
rfPIC12F675
9.0
UHF ASK/FSK TRANSMITTER
9.1
Transmitter Operation
The transmitter is a fully integrated UHF ASK/FSK
transmitter consisting of crystal oscillator, Phase-
Locked Loop (PLL), Power Amplifier (PA) with open-
collector output, and mode control logic. There are 3
variations of this device to optimize its performance for
the most commonly used frequency bands.
TABLE 9-1:
FREQUENCY BANDS
The internal structure of the transmitter is shown in
A
Colpitts
oscillator
generates
the
reference frequency set by the attached crystal. The
voltage controlled oscillator (VCO) converts the voltage
on the LF pin to a frequency. This frequency is divided
by 32 and compared to the crystal reference. If the
frequency or phase does not match the reference, the
charge pump corrects the voltage on the LF pin. The
VCO output signal is also amplified by the PA, whose
single ended output drives the user’s antenna.
The external components required are a crystal to set
the transmit frequency, a supply bypass capacitor, and
two to seven biasing/impedance matching components
to get maximum power to the antenna. The two control
signals from the microcontroller are connected exter-
nally for maximum design flexibility. The rfPIC12F675
is capable of transmitting data by Amplitude Shift
Keying (ASK) or Frequency Shift Keying (FSK).
The rfPIC12F675 is a radio frequency (RF) emitting
device. Wireless RF devices are governed by a
country’s regulating agency. For example, in the United
States it is the Federal Communications Committee
(FCC) and in Europe it is the European Conference of
Postal
and
Telecommunications
Administrations
(CEPT). It is the responsibility of the designer to ensure
that their end product conforms to rules and regulations
of the country of use and/or sale.
FIGURE 9-1:
TRANSMITTER BLOCK
DIAGRAM
9.2
Supply Voltage (V
DDRF, VSSRF)
Pins V
DDRF and VSSRF supply power and ground
respectively to the transmitter. These power pins are
separate from power supply pins V
DD and VSS to the
microcontroller
. Both VSSRF pins should be tied to the
ground plane with the shortest possible traces. The
microcontroller ground should be tied to the same RF
ground potential. However, the V
DDRF supply can be at
a different potential than the microcontroller as long as
the RFEN and DATA input levels are within specifica-
tion limits.
Device
Frequency
Modulation
rfPIC12F675K
290-350 MHz
ASK/FSK
rfPIC12F675F
390-450 MHz
ASK/FSK
rfPIC12F675H
850-930 MHz
ASK/FSK
RF devices require correct board level implementa-
tion in order to meet regulatory requirements. Layout
considerations are listed at the end of each subsec-
tion. It is required to place a ground plane on the PCB
to reduce unwanted radio frequency emissions.
Layout Considerations - Provide low impedance
power and ground traces to minimize spurious
emissions. A two-sided PCB with a ground plane on
the bottom layer is highly recommended. Separate
bypass capacitors should be connected as close as
possible to each of the supply pins V
DD and VDDRF.
Connect both V
SSRF pins to the ground plane using
multiple PCB vias adjacent to the V
SSRF pads. Do not
share these PCB vias with other ground traces. Filter
the V
DDRF with an RC filter if the microcontroller noise
spurs exceed regulatory limits.
Clock
Divider
Voltage
Controlled
Oscillator
RF Power
Amplifier
Crystal
Oscillator
Phase/Freq
Detector
Charge
Pump
FSK Switch
REFCLK
RF
Control
Logic
FSK
OUT
V
DDRF
V
SSRF
V
SSRF
RFEN
ANT
LF
RFXTAL
PS
DATA
ASK
Divide
by 32
DATA
FSK
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相关代理商/技术参数 |
参数描述 |
|---|---|
| RFPIC12F675K-I/SS | 功能描述:射频微控制器 - MCU 290-350MHz UHF ASK/FSK Transmitter RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:Si100x 数据总线宽度:8 bit 最大时钟频率:24 MHz 程序存储器大小:64 KB 数据 RAM 大小:4 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LGA-42 安装风格:SMD/SMT 封装:Tube |
| RFPIC12F675KT-I/SS | 功能描述:射频微控制器 - MCU 1 KB Flash FSK ASK RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:Si100x 数据总线宽度:8 bit 最大时钟频率:24 MHz 程序存储器大小:64 KB 数据 RAM 大小:4 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LGA-42 安装风格:SMD/SMT 封装:Tube |
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