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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