參數(shù)資料
型號： MICRF112YMM10
廠商： MICREL INC
元件分類： 消費(fèi)家電
英文描述： QwikRadio㈢ UHF ASK/FSK Transmitter
中文描述： SPECIALTY CONSUMER CIRCUIT, PDSO10
封裝： MSOP-10
文件頁數(shù)： 12/20頁
文件大?。?/td> 537K
代理商： MICRF112YMM10
Micrel, Inc.
MICRF112
Functional Diagram
March 2007
12
M9999-030107
(408) 944-0800
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×32, power ampli
fi
er, enable control,
under voltage detect and open drain switch for FSK
operation.
Crystal Oscillator
The reference oscillator is crystal-based
con
fi
guration. It is designed to accept crystals with
frequency from 9.375MHz to 14.0625MHz.
Pierce
Crystal Oscillator Parameters for ASK Operation
Figure
4
shows
a
con
fi
guration 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
reference
oscillator
circuit
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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