SA9024 データシートの表示（PDF） - Philips Electronics

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SA9024

900 MHz transmit modulator and 1.3 GHz fractional–N synthesizer

Philips Electronics 

Philips Semiconductors

900 MHz transmit modulator and 1.3 GHz

fractional–N synthesizer

Objective specification

SA9024

OPERATING MODES & POWER DOWN CONTROL

There are two power saving modes of operation which the SA9024

can be put into, dependent on the status of the system. The

intention of these different modes is to disable circuity that is not in

use at the time in order to reduce power consumption. During sleep

mode, only circuitry which is required to provide a master clock to

the digital portion of the system is enabled. During receive mode,

circuitry which is used to perform the receive function and provide a

master clock is enabled. In transmit mode all the functions of the

chip are enabled which are required to perform transmit, receive and

provide master clock.

SA9024 POWER MODE TRUTH TABLE

Sleep Mode

Enabled

yes

no

Crystal Oscillator



Phase detector and charge pump (transmit offset)



VCO



SSB Up-converter



MCLK Buffer



RCLK Buffer



÷M offset loop divider



TXLO Buffer



RXLO Buffer



I/Q Modulator



Variable Gain Amp.



Control Logic



Main Divider



Reference Divider



Auxiliary Divider



Main Phase Detector and charge pump



Auxiliary Phase Detector and charge pump



Lock Detect



Receive Mode

yes

no





































Transmit Mode

yes

no





































1997 Aug 01

5

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