Microwave Wideband Synthesizer
with Integrated VCO
Data Sheet
ADF4355-3
FEATURES
GENERAL DESCRIPTION
RF output frequency range: 51.5625 MHz to 6600 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
All power supplies: 3.3 V
The ADF4355-3 allows the 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 at the output provide
operation from 51.5625 MHz to 6600 MHz.
The ADF4355-3 has an integrated VCO with a fundamental
output frequency ranging from 3300 MHz to 6600 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 RF output
frequencies as low as 51.5625 MHz. For applications that require
isolation, the RF output stage can be muted. The mute function
is both pin- and software-controllable.
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
APPLICATIONS
Control of all on-chip registers is through a simple 3-wire interface.
The ADF4355-3 operates with analog, digital, charge pump, and
VCO power supplies ranging from 3.1515 V to 3.4485 V. The
ADF4355-3 also contains hardware and software power-down
modes.
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
IN
C
C
1
2
REG
REG
CLK
DATA
LE
DATA REGISTER
FUNCTION
LATCH
CHARGE
PUMP
CP
OUT
PHASE
COMPARATOR
V
V
TUNE
REF
V
V
VCO
CORE
BIAS
INTEGER
REG
FRACTION
REG
MODULUS
REG
REGVCO
RF
RF
A+
A–
OUT
OUT
1/2/4/8
16/32/64
OUTPUT
STAGE
THIRD-ORDER
÷
FRACTIONAL
INTERPOLATOR
PDB
RF
RF
N COUNTER
B+
B–
OUTPUT
STAGE
OUT
RF
OUT
MULTIPLEXER
SD
ADF4355-3
A
CP
A
GNDVCO
A
GND
GND
GND
GNDRF
Figure 1.
Rev. B
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