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SA9025 Datasheet(Fiches technique) 5 Page - NXP Semiconductors

Numéro de pièce SA9025
Description  900 MHz transmit modulator and 2.2 GHz fractional-N synthesizer
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
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Philips Semiconductors
Objective specification
SA9025
900 MHz transmit modulator and 2.2 GHz
fractional–N synthesizer
1997 Aug 01
5
OPERATING MODES & POWER DOWN CONTROL
There are two power saving modes of operation which the SA9025
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.
SA9025 POWER MODE TRUTH TABLE
Sleep Mode
Receive Mode
Transmit Mode
Enabled
yes
no
yes
no
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







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