參數(shù)資料
型號(hào)： ACD2204S8P1
廠商： ANADIGICS INC
元件分類： 上/下變頻器
英文描述： RF/MICROWAVE DOWN CONVERTER
封裝： S8, MO-137AF, SSOP-28
文件頁(yè)數(shù)： 2/20頁(yè)
文件大?。?/td> 350K
代理商： ACD2204S8P1
10
PRELIMINARY DATA SHEET - Rev 1.0
04/2003
ACD2204
(1)
(2)
VCO INPUT VOLTAGE
VCO OUTPUT
FREQUENCY
S
2
S
1
D
1
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10
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1
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A
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C
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D
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T
I
R
A
L
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P
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C
V
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C
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C
A
R
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2
1
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2
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Table 15: Phase Detector Polarity Selection
Programmable Modes
Each register contains bits set aside for programming
different modes of operation in the synthesizers.
Currently, the only programmable mode is the polarity
of the phase detector in each of the synthesizers. Bit
D1 in each reference divider register controls this
feature. Bits D2 through D5 in the reference divider
registers and bits C1 and C2 in the main divider
registers are reserved for future use, and have no
Table 14: Phase Detector Polarity Bit
Figure 10: VCO Characteristics
current function. They can be set either high or low
without affecting synthesizer performance.
Setting Phase Detector Polarity
Table 14 shows how bit D1 of each reference divider
register controls the polarity of the phase detector
associated with each PLL. The correct setting is
determined by using Table 15 and Figure 10.
Synthesizer Programming Example
The following example for programming the two synthesizers in the ACD2204 details the calculations
used to determine the required value of each bit in all four registers:
Requirements
Desired CATV input channel: “HHH” - 499.25 MHz picture carrier (501 MHz digital channel center frequency)
(Second) IF picture carrier output frequency: 45.75 MHz (44 MHz digital channel center frequency)
First IF frequency: 1087.75 MHz
Phase detector comparison frequency for down converter (also tuning increment): 62.5 KHz
Phase detector comparison frequency for up converter: 250 KHz
Crystal reference oscillator frequency: 4 MHz
Calculation of Reference Divider Values
The value for each reference divider is calculated by dividing the reference oscillator frequency by the desired
phase detector comparison frequency:
R = fOSC / fPD
For the down converter, the 4 MHz crystal oscillator frequency and the 62.5 KHz phase detector comparison
frequency are used to yield RPLL2 = 4 MHz / 62.5 KHz = 64, and so the bit values for the down converter
R counter are RPLL2 = 000000001000000.
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