MICRF113 datasheet(12/20 Pages) MICREL

12 / 20 page

Micrel, Inc.

MICRF113

June 2008

M9999-060208

(408) 944-0800

ESR

XTLOUT

VSS

XTLIN

MICRF113 ASK

CRYSTAL MODEL

CLOAD

CPAR

CMO

CLOAD

Figure 4. Reference Oscillator ASK Operation

When the ESR of crystal is at 300Ω, the crystal

parameter limits are:

ESR

300Ω

CPAR

2 to 5pF

CMO

10 to 40fF

CLOAD

10 to 30pF

PLL ×32

The function of PLL×32 is to provide a stable carrier

frequency for transmission. It is a “divide by 32” phase

locked loop oscillator.

Power Amplifier

The power amplifier serves two purposes: 1) to buffer

the VCO from external elements and 2) to amplify the

phase locked signal. The power amplifier can produce

+10dBm at 3V (typical).

Enable Control

Enable control gates the ASK data. It only allows

transmission when Lock, Amplitude and Under Voltage

Detect conditions are valid.

Under Voltage Detect

“Under voltage detect” block senses operating voltage.

If the operating voltage falls below 1.6V, “under voltage

detect” block will send a signal to “enable control” block

to disable the PA.

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