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ADRF6655ACPZ-R7 Datasheet(PDF) 26 Page - Analog Devices

No. de pieza ADRF6655ACPZ-R7
Descripción Electrónicos  Broadband Up/Downconverting Mixer with Integrated Fractional-N PLL and VCO
PDF  44 Pages
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
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ADRF6655ACPZ-R7 Datasheet(HTML) 26 Page - Analog Devices

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ADRF6655
Rev. 0 | Page 26 of 44
Divide Mode
REGISTER 0—INTEGER DIVIDE CONTROL
Divide mode determines whether fractional mode or integer
mode is used. In integer mode, the RF VCO output frequency
(fVCO) is calculated by
With R0[2:0] set to 000, the on-chip integer divide control register
is programmed as shown in Figure 70.
Integer Divide Ratio
fVCO = 2 × fPFD × (INT)
(2)
The integer divide ratio is used to set the INT value in Equation 1.
The INT, FRAC, and MOD values make it possible to generate
output frequencies that are spaced by fractions of the PFD
frequency. The VCO frequency (FVCO) equation is
where INT is the integer divide ratio value (21 to 123 in integer
mode).
fVCO = 2 × fPFD × (INT + (FRAC/MOD))
(1)
where:
fVCO is the output frequency of the internal VCO.
fPFD is the frequency of operation of the phase-frequency
detector.
INT is the preset integer divide ratio value (24 to 119 in
fractional mode).
MOD is the preset fractional modulus (1 to 2047).
FRAC is the preset fractional divider ratio value (0 to MOD − 1).
DIVIDE
MODE
DB23
DB22
DB21
DB20
DB19
DB18
DB17
DB16
DB15
DB14
DB13
DB12
DB11
DB10
DB9 DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
00
00
00
000
00
0
0
DM
ID6
ID5
ID4
ID3
ID2
ID1
ID0
C3(0)
C2(0)
C1(0)
DM
0
1
ID6
ID5
ID4
ID3
ID2
ID1
ID0
00
1
0
1
0
1
00
1
0
1
1
0
00
1
0
1
1
1
00
1
1
0
0
0
...
...
...
...
...
...
...
...
...
...
...
...
...
...
01
1
1
0
0
0
...
...
...
...
...
...
...
...
...
...
...
...
...
...
11
1
0
1
1
1
11
1
1
0
0
0
11
1
1
0
0
1
11
1
1
0
1
0
11
1
1
0
1
1
...
...
119
120 (INTEGER MODE ONLY)
INTEGER DIVIDE RATIO
21 (INTEGER MODE ONLY)
22 (INTEGER MODE ONLY)
23 (INTEGER MODE ONLY)
24
...
...
56
INTEGER
INTEGER DIVIDE RATIO
CONTROL BITS
DIVIDE MODE
FRACTIONAL
121 (INTEGER MODE ONLY)
122 (INTEGER MODE ONLY)
123 (INTEGER MODE ONLY)
RESERVED
Figure 70. Integer Divide Control Register (R0)



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