SA9024 datasheet(19/23 Pages) PHILIPS

No de pièce	SA9024

Description	900 MHz transmit modulator and 1.3 GHz fractional-N synthesizer

PDF	23 Pages

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Fabricant	PHILIPS [NXP Semiconductors]

Site Internet	http://www.nxp.com

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Philips Semiconductors

Objective specification

SA9024

900 MHz transmit modulator and 1.3 GHz

fractional–N synthesizer

1997 Aug 01

SR01451

REF DIVIDER

AUX/MAIN

DIVIDER

CLK

“1”

CLK

“1”

VDDA

GND

VSSA

P–TYPE

CHARGE PUMP

N–TYPE

CHARGE PUMP

INR

IPH

Figure 9.

Phase Detector Structure With Timing

Main Output Charge Pumps and Fractional

Compensation Currents

The main charge pumps on pin PHP and PHI are driven by the main

phase detector. The current value is determined by the current at

pin RN. The fractional compensation current is linearly dependent

on the main charge pump current and its level relative to the main

charge pumps is set by an 8-bit programmable DAC. The timing for

the fractional compensation is derived from the main divider. The

current level based on the value of FRD, FDAC and ISET. Figure 10

shows the waveforms (not to scale) for a typical base.

SA9024 Fiches technique(PDF) 19 Page - NXP Semiconductors