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MICRF112YMM Datasheet(PDF) 11 Page - Micrel Semiconductor

Part # MICRF112YMM
Description  300MHz to 450MHz, 10dBm, 1.8V to 3.6V, ASK/FSK Transmitter with Shutdown
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF112YMM Datasheet(HTML) 11 Page - Micrel Semiconductor

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Micrel, Inc.
MICRF112
February 2013
11
M9999-020713
Functional Diagram
Figure 1. Functional Block Diagram MICRF112 10 Pin ASK/FSK Version
Functional Description
Figure 1 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
amplifier, enable control,
undervoltage detect, and open-drain switch for FSK
operation.
Crystal Oscillator
The reference oscillator is a crystal-based Pierce
configuration. It is designed to accept crystals with
frequencies from 9.375MHz to 14.0625MHz.
Crystal Oscillator Parameters for ASK Operation
Figure
2
shows
a
reference
oscillator
circuit
configuration for ASK operation. The reference oscillator
can drive crystals with an ESR range from 20
Ω to 300Ω.
When the ESR of the crystal is at 20
Ω, the crystal
parameter limits are:
ESR
20
Ω
CPAR
2 to 10pF
CMO
10 to 40fF
Figure 2. Reference Oscillator ASK Operation
When the ESR of the
crystal is at 300Ω, the crystal
parameter limits are:
ESR
300
Ω
CPAR
2 to 5pF
CMO
10 to 40fF
CLOAD
10 to 30pF


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