SA9024 데이터 시트보기 (PDF) - Philips Electronics
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SA9024 Datasheet PDF : 23 Pages
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Philips Semiconductors
900 MHz transmit modulator and 1.3 GHz
fractional–N synthesizer
Objective specification
SA9024
“1”
D
Q
INR
REF DIVIDER
CLK
R
R
τ
AUX/MAIN
DIVIDER
“1”
D
R
CLK
X
Q
VDDA
P
P–TYPE
CHARGE PUMP
PH
N–TYPE
CHARGE PUMP
N
GND
VSSA
INR
R
X
P
N
IPH
Figure 9. Phase Detector Structure With Timing
SR01451
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.
1997 Aug 01
19
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