參數(shù)資料
型號: MICRF112YMM TR
廠商: Micrel Inc
文件頁數(shù): 12/20頁
文件大小: 550K
描述: IC XMITTER UHF ASK/FSK 10-MSOP
標準包裝: 2,500
頻率: 300MHz ~ 450MHz
應用: RKE
調(diào)制或協(xié)議: ASK,OOK
數(shù)據(jù)傳輸率 - 最大: 50 kbps
功率 - 輸出: 10dBm
電流 - 傳輸: 12.3mA
數(shù)據(jù)接口: PCB,表面貼裝
天線連接器: PCB,表面貼裝
電源電壓: 1.8 V ~ 3.6 V
工作溫度: -40°C ~ 125°C
封裝/外殼: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
包裝: 帶卷 (TR)
其它名稱: MICRF112YMMTR
MICRF112YMMTR-ND
Micrel, Inc.
MICRF112
 
 
December 2011 
12
M9999-120911
(408) 944-0800
 
 Functional Diagram
 
 
 
 
Figure 3. Functional Block Diagram MICRF112 10 Pin ASK / FSK Version
Functional Description
Figure 3 shows a functional block diagram of the
MICRF112 transmitter. The MICRF112 can be best
described as a phase locked transmitter. The system
can be partitioned into six functional blocks; crystal
oscillator, PLL?2, power amplier, enable control,
under voltage detect and open drain switch for FSK
operation.
Crystal Oscillator
The   reference   oscillator   is   crystal-based   Pierce
conguration. It is designed to accept crystals with
frequency from 9.375MHz to 14.0625MHz.
Crystal Oscillator Parameters for ASK Operation
Figure   4   shows   a   reference   oscillator   circuit
conguration for ASK operation. The reference oscillator
is capable of driving crystals with ESR range from 20&
to 300&.
When the ESR of crystal is at 20&, the crystal parameter
limits are:
ESR 20&
C
PAR
 2 to 10pF
C
MO
 10 to 40fF
 
Figure 4. Reference Oscillator ASK Operation
 
When the ESR of crystal is at 300&, the crystal
parameter limits are:  
ESR
300&
C
PAR
 
2 to 5pF
C
MO
 
 
10 to 40fF
C
LOAD
 
10 to 30pF
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