參數(shù)資料
型號(hào): SA9025
廠商: NXP SEMICONDUCTORS
元件分類(lèi): 通信及網(wǎng)絡(luò)
英文描述: 900 MHz transmit modulator and 2.2 GHz fractional-N synthesizer
中文描述: SPECIALTY TELECOM CIRCUIT, PQFP48
封裝: 7 X 7 X 1.40 MM, PLASTIC, LQFP-48
文件頁(yè)數(shù): 19/23頁(yè)
文件大?。?/td> 134K
代理商: SA9025
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
V
DDA
GND
PH
V
SSA
P–TYPE
CHARGE PUMP
N–TYPE
CHARGE PUMP
R
INR
INR
I
PH
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 I
SET
. Figure 10
shows the waveforms (not to scale) for a typical base.
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