PCF5079T Просмотр технического описания (PDF) - Philips Electronics

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PCF5079T

Dual-band power amplifier controller for GSM, PCN and DCS

Philips Electronics 

Philips Semiconductors

Dual-band power amplifier controller for

GSM, PCN and DCS

Product specification

PCF5079

handbook, full pagewidth

VDD

PU

VVDAC

CODE KICK

CODE START

td1

>5 µs

>70 mV

0

2

4

6

8...

td2

>20 µs

S1

S3

td3

<3 µs

(max)

S4

SFD, SFG

S5

VVCD, VVCG

Vhome

Vprebias

td4

2 µs (typ)

time

time

time (QB)

closed

open

time

closed

open

time

closed

open

time

closed

open

time

closed

open

time

time

MGT327

The maximum value of CODESTART is limited by the isolation requirement of the PA used in the application. The pulse determined by CODEKICK minus

CODESTART applied for two quarter-bits ensures a start-up of the control voltage with very low jitter and high repetitivity. The codes following CODEKICK

have to be chosen to get the best ramp shape and spectrum performance.

Fig.4 Start-up and initialization timing diagram.

2001 Nov 21

7

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