参数资料
型号: MICRF102YM
厂商: Micrel Inc
文件页数: 6/12页
文件大小: 335K
描述: IC ASK TRANSMITTER UHF 8SOIC
标准包装: 95
频率: 300MHz ~ 470MHz
应用: RKE
调制或协议: ASK,OOK
数据传输率 - 最大: 20 kbps
功率 - 输出: -4dBm
电流 - 传输: 4.7mA
数据接口: PCB,表面贴装
天线连接器: PCB,表面贴装
电源电压: 4.75 V ~ 5.5 V
工作温度: -40°C ~ 85°C
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 管件
产品目录页面: 571 (CN2011-ZH PDF)
其它名称: 576-1338
MICRF102
Micrel
MICRF102
6
December 2006
Functional Description
The block diagram illustrates the basic structure of the
MICRF102. Identi ed in the  gure are the principal functional
blocks of the IC, namely the (1, 2, 3, 4, 5) UHF Synthesizer,
(6a/b) Buffer, (7) Antenna tuner, (8) Power ampli er, (9) TX
bias control, (10) Reference bias and, (11) Process tuner.
The UHF synthesizer generates the carrier frequency with
quadrature outputs. The in-phase signal (I) is used to drive
the PA and the quadrature signal (Q) is used to compare the
antenna signal phase for antenna tuning purposes.
The Antenna tuner block senses the phase of the transmit
signal at the antenna port and controls the varactor capacitor
to tune the antenna.
The Power control unit senses the antenna signal and con-
trols the PA bias current to regulate the antenna signal to
the transmit power.
Block Diagram
TX
Bias
Control
Varactor
Device
Antenna
Tuning
Control
Power
Amp
Buffer
VSS
ANTM
ANTP
ASK
Buffer
Prescaler
Divide
by 32
REF.OSC
PC
VDD
VDD
(10)
(5)
(2)
Reference
Oscillator (1)
VCO (4)
(3)
(9)
(8)
(7)
(11)
(6a)
(6b)
STBY
Reference
Bias
Phase
Detector
The Process tune circuit generates process independent bias
currents for different blocks.
A PCB antenna loop coupled with a resonator and a resistor
divider network are all the components required to construct
a complete UHF transmitter for remote actuation applications
such as automotive keyless entry.
Included within the IC is a differential varactor that serves
as the tuning element to insure that the transmit frequency
and antenna are aligned with the receiver over all supply and
temperature variations.
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