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ADRF6806ACPZ-R7 датащи(PDF) 15 Page - Analog Devices

номер детали ADRF6806ACPZ-R7
подробное описание детали  50 MHz to 525 MHz Quadrature Demodulator with Fractional-N PLL and VCO
PDF  36 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

ADRF6806ACPZ-R7 датащи(HTML) 15 Page - Analog Devices

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Data Sheet
ADRF6806
Rev. B | Page 15 of 36
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
00
00
00
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)
DIVIDE RATIO
21 (INTEGER MODE ONLY)
22 (INTEGER MODE ONLY)
23 (INTEGER MODE ONLY)
24
...
...
56 (DEFAULT)
INTEGER
INTEGER DIVIDE RATIO
CONTROL BITS
DIVIDE MODE
FRACTIONAL (DEFAULT)
121 (INTEGER MODE ONLY)
122 (INTEGER MODE ONLY)
123 (INTEGER MODE ONLY)
Figure 33. Integer Divide Control Register (R0)
Register 0—Integer Divide Control
With R0[2:0] set to 000, the on-chip integer divide control register
is programmed as shown in Figure 33. The internal VCO
frequency (fVCO) equation is
fVCO = fPFD × (INT + (FRAC/MOD)) × 2
(1)
where:
fVCO is the output frequency of the internal VCO.
INT is the preset integer divide ratio value (21 to 123 for integer
mode, 24 to 119 for fractional mode).
MOD is the preset fractional modulus (1 to 2047).
FRAC is the preset fractional divider ratio value (0 to MOD − 1).
The integer divide ratio sets 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.
Note that the demodulator LO frequency is given by fLO = fVCO/M,
where M is the programmed LO main divider (see Table 5).
Divide Mode
Divide mode determines whether fractional mode or integer mode
is used. In integer mode, the VCO output frequency, fVCO, is
calculated by
fVCO = fPFD × (INT) × 2
(2)



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