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MICRF113 Datasheet(PDF) 11 Page - Micrel Semiconductor

Part # MICRF113
Description  QwikRadio짰 ASK Transmitter
PDF  20 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF113 Datasheet(HTML) 11 Page - Micrel Semiconductor

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Micrel, Inc.
MICRF113
June 2008
11
M9999-060208
(408) 944-0800
Functional Diagram
PLL X 32
XTLIN
XTLOUT
PFD
VCO
VDD
VSS
Lock
Amplitude
Divider
Enable
Control
Under Voltage
Detect
Charge
Pump
XTAL
Osc.
PA
PAOUT
ASK
Figure 3. Functional Block Diagram MICRF113
Functional Description
Figure 3 is a functional block diagram of the MICRF113
transmitter. The MICRF113 is best described as a phase
locked transmitter. The MICRF113 system is partitioned
into five functional blocks:
• Crystal oscillator
• PLL×32
• Power amplifier
• Enable control
• Under voltage detection
Crystal Oscillator
The
reference
oscillator
is
crystal-based
Pierce
configuration, 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
configuration for ASK operation. The reference oscillator
is capable of driving crystals with ESR range from 20Ω
to 300Ω.
When the ESR of crystal is at 20Ω, the crystal parameter
limits are:
ESR 20Ω
Cpar 2 to 10pF
Cmo 10 to 40fF



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