CMX8341 datasheet(21/70 Pages) CMLMICRO

21 / 70 page

Digital PMR (dPMR) Baseband Processor

CMX8341

 2014 CML Microsystems Plc

D/8341/7

0 ≤│f │ < (1 - α) / 2T

│H( f )│= cos[(T / 4α)(2π│f │-π( 1 - α)/ T]

(1 + α) / 2T ≤│f │

(1 - α) / 2T ≤│f │ < (1 + α) / 2T

α = 0.2

T = 1/2400

*Tx Baseband Filter

Frequency

Modulator

4FSK

Output

Information

bits input

H(f )

Filter

4 FSK Deviation

Di-bit

Symbol

Deviation

012

+1 050Hz

+350Hz

-350Hz

-1050Hz

-1

-3

002

102

112

*Rx Baseband Filter

Frequency

Demod

FM IF

signal

H(f )

Filter

D(f )

Filter

Information

bits output

0 ≤│f │ < (1 - α) / 2T

│H( f )│= cos[(T / 4α)(2π│f │-π( 1 - α)/ T]

(1 + α) / 2T ≤│f │

(1 - α) / 2T ≤│f │ < (1 + α) / 2T

│D( f )│=

sin (π f T)

π f T

α = 0.2

T = 1/2400

Figure 9 dPMR Modulation Characteristics

6.2

Internal Data Processing

The CMX8341 operates as a half-duplex device, either receiving signals from the RF circuits in Rx mode,

or sourcing signals to the RF circuits in Tx mode. It also has a low power Idle mode to support battery

saving protocols. The internal data processing blocks for Tx and Rx modes are illustrated in Figure 10.

CMX8341 Datasheet(PDF) 21 Page - CML Microcircuits

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