Microwave Wideband Synthesizer
with Integrated VCO
Data Sheet
ADF4355
FEATURES
GENERAL DESCRIPTION
RF output frequency range: 54 MHz to 6800 MHz
Fractional-N synthesizer and integer-N synthesizer
High resolution 38-bit modulus
Low phase noise, voltage controlled oscillator (VCO)
Programmable divide by 1, 2, 4, 8, 16, 32, or 64 output
Analog and digital power supplies: 3.3 V
Charge pump and VCO power supplies: 5.0 V typical
Logic compatibility: 1.8 V
Programmable dual modulus prescaler of 4/5 or 8/9
Programmable output power level
RF output mute function
3-wire serial interface
Analog and digital lock detect
The ADF4355 allows implementation of fractional-N or
integer-N phase-locked loop (PLL) frequency synthesizers
when used with an external loop filter and an external reference
frequency. A series of frequency dividers permits operation
from 54 MHz to 6800 MHz.
The ADF4355 has an integrated VCO with a fundamental
output frequency ranging from 3400 MHz to 6800 MHz. In
addition, the VCO frequency is connected to divide by 1, 2, 4, 8,
16, 32, or 64 circuits that allow the user to generate radio frequency
(RF) output frequencies as low as 54 MHz. For applications that
require isolation, the RF output stage can be muted. The mute
function is both pin and software controllable.
Control of all on-chip registers is through a simple 3-wire interface.
The ADF4355 operates with analog and digital power supplies
ranging from 3.15 V to 3.45 V, with charge pump and VCO
supplies from 4.75 V to 5.25 V. The ADF4355 also contains
hardware and software power-down modes.
APPLICATIONS
Wireless infrastructure (W-CDMA, TD-SCDMA, WiMAX, GSM,
PCS, DCS, DECT)
Point to point/point to multipoint microwave links
Satellites/VSATs
Test equipment/instrumentation
Clock generation
FUNCTIONAL BLOCK DIAGRAM
AV
DV
V
R
V
VCO
V
AV
DD
CE
DD
DD
P
SET
RF
MULTIPLEXER
MUXOUT
10-BIT R
COUNTER
÷2
DIVIDER
REF
REF
A
B
IN
×2
DOUBLER
LOCK
DETECT
C
1
IN
REG
REG
C
2
CLK
DATA
LE
DATA REGISTER
FUNCTION
LATCH
CHARGE
PUMP
CP
OUT
PHASE
COMPARATOR
V
V
TUNE
REF
V
VCO
CORE
BIAS
INTEGER
REGISTER
FRACTION
REGISTER
MODULUS
REGISTER
V
REGVCO
RF
RF
A+
A–
OUT
OUT
1/2/4/8
16/32/64
OUTPUT
STAGE
THIRD-ORDER
÷
FRACTIONAL
INTERPOLATOR
PDB
RF
RF
B+
B–
OUTPUT
STAGE
OUT
N COUNTER
RF
OUT
MULTIPLEXER
SD
ADF4355
A
CP
A
GNDVCO
A
GND
GND
GND
GNDRF
Figure 1.
Rev. B
Document Feedback
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rightsof third parties that may result fromits use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks andregisteredtrademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2015–2017 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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