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SA9025 Datasheet(Fiches technique) 19 Page - NXP Semiconductors

Numéro de pièce SA9025
Description  900 MHz transmit modulator and 2.2 GHz fractional-N synthesizer
Télécharger  23 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
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 19 page
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Philips Semiconductors
Objective specification
SA9025
900 MHz transmit modulator and 2.2 GHz
fractional–N synthesizer
1997 Aug 01
19
SR01451
R
X
P
N
REF DIVIDER
AUX/MAIN
DIVIDER
D
Q
CLK
“1”
R
D
R
CLK
“1”
X
Q
N
P
τ
VDDA
GND
PH
VSSA
P–TYPE
CHARGE PUMP
N–TYPE
CHARGE PUMP
R
INR
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.




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