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ADF4156 データシート(PDF) 8 Page - Analog Devices

部品番号 ADF4156
部品情報  6 GHz Fractional-N Frequency Synthesizer
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

ADF4156 データシート(HTML) 8 Page - Analog Devices

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ADF4156
Rev. 0 | Page 8 of 24
CIRCUIT DESCRIPTION
REFERENCE INPUT SECTION
The reference input stage is shown in Figure 11. SW1 and SW2
are normally closed switches. SW3 is normally open. When
power-down is initiated, SW3 is closed and SW1 and SW2 are
opened. This ensures that there is no loading of the REFIN pin
on power-down.
BUFFER
TO R COUNTER
REFIN
100kΩ
NC
SW2
SW3
NO
NC
SW1
POWER-DOWN
CONTROL
Figure 11. Reference Input Stage
RF INPUT STAGE
The RF input stage is shown in Figure 12. It is followed by a
2-stage limiting amplifier to generate the current-mode logic
(CML) clock levels needed for the prescaler.
BIAS
GENERATOR
1.6V
AGND
AVDD
RFINB
RFINA
2kΩ
2kΩ
Figure 12. RF Input Stage
RF INT DIVIDER
The RF INT counter allows a division ratio in the PLL feedback
counter. Division ratios from 23 to 4095 are allowed.
INT, FRAC, MOD, AND R RELATIONSHIP
The INT, FRAC, and MOD values, in conjunction with the
R counter, make it possible to generate output frequencies that
are spaced by fractions of the phase frequency detector (PFD).
See the RF Synthesizer: A Worked Example section for more
information. The RF VCO frequency (RFOUT) equation is
RFOUT = FPFD × (INT + (FRAC/MOD))
(1)
where RFOUT is the output frequency of external voltage
controlled oscillator (VCO).
FPFD = REFIN × [(1 + D)/(R × (1 + T))]
(2)
where:
REFIN is the reference input frequency.
D is the REFIN doubler bit.
T is the REFIN divide-by-2 bit (0 or 1).
R is the preset divide ratio of binary 5-bit programmable
reference counter (1 to 32).
INT is the preset divide ratio of binary 12-bit counter
(23 to 4095).
MOD is the preset fractional modulus (2 to 4095).
FRAC is the numerator of the fractional division (0 to MOD−1).
THIRD ORDER
FRACTIONAL
INTERPOLATOR
FRAC
VALUE
MOD
REG
INT
REG
RF N DIVIDER
N = INT + FRAC/MOD
FROM RF
INPUT STAGE
TO PFD
N COUNTER
Figure 13. RF INT Divider
RF R COUNTER
The 5-bit RF R counter allows the input reference frequency
(REFIN) to be divided down to produce the reference clock to
the PFD. Division ratios from 1 to 32 are allowed.


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