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ADF4110BCP View Datasheet(PDF) - Analog Devices

Part Name
Description
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ADF4110BCP
ADI
Analog Devices ADI
ADF4110BCP Datasheet PDF : 28 Pages
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ADF4110/ADF4111/ADF4112/ADF4113
CIRCUIT DESCRIPTION
REFERENCE INPUT SECTION
The reference input stage is shown in Figure 28. 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.
POWER-DOWN
CONTROL
NC 100k
REFIN NC
SW2
SW1
SW3
NO
TO R COUNTER
BUFFER
Figure 28. Reference Input Stage
RF INPUT STAGE
The RF input stage is shown in Figure 29. It is followed by a
two-stage limiting amplifier to generate the current mode logic
(CML) clock levels needed for the prescaler.
BIAS
GENERATOR
1.6V
500
500
RFINA
RFINB
AVDD
AGND
Figure 29. RF Input Stage
PRESCALER (P/P + 1)
Along with the A and B counters, the dual-modulus prescaler
(P/P + 1) enables the large division ratio, N, to be realized (N =
BP + A). The dual-modulus prescaler, operating at CML levels,
takes the clock from the RF input stage and divides it down to a
manageable frequency for the CMOS A and B counters. The
prescaler is programmable; it can be set in software to 8/9,
16/17, 32/33, or 64/65. It is based on a synchronous 4/5 core.
A AND B COUNTERS
The A and B CMOS counters combine with the dual-modulus
prescaler to allow a wide ranging division ratio in the PLL
feedback counter. The counters are specified to work when the
prescaler output is 200 MHz or less. Thus, with an RF input
frequency of 2.5 GHz, a prescaler value of 16/17 is valid but a
value of 8/9 is not.
Pulse Swallow Function
The A and B counters, in conjunction with the dual-modulus
prescaler, make it possible to generate output frequencies that
are spaced only by the reference frequency divided by R. The
equation for the VCO frequency is
fVCO = [(P × B) + A]fREFIN/R
where:
fVCO = output frequency of external voltage controlled oscillator
(VCO)
P = preset modulus of dual-modulus prescaler
B = preset divide ratio of binary 13-bit counter(3 to 8191)
A = preset divide ratio of binary 6-bit swallow counter (0 to 63)
fREFIN = output frequency of the external reference frequency
oscillator
R = preset divide ratio of binary 14-bit programmable reference
counter (1 to 16383)
R COUNTER
The 14-bit R counter allows the input reference frequency to be
divided down to produce the reference clock to the phase
frequency detector (PFD). Division ratios from 1 to 16,383 are
allowed.
N = BP + A
FROM RF
INPUT STAGE
PRESCALER
P/P + 1
MODULUS
CONTROL
13-BIT B
COUNTER
LOAD
LOAD
6-BIT A
COUNTER
Figure 30. A and B Counters
TO PFD
Rev. C | Page 12 of 28
 

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