MICRF113 datasheet(11/20 Pages) MICREL

11 / 20 page

Micrel, Inc.

MICRF113

June 2008

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.

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

crystal-based

Pierce

conﬁguration, designed to accept crystals with frequency

from 9.375MHz to 14.0625MHz.

Crystal Oscillator Parameters for ASK Operation

Figure

shows

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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