Microwave Wideband Synthesizer
with Integrated VCO
Data Sheet
ADF4355-2
FEATURES
GENERAL DESCRIPTION
RF output frequency range: 54 MHz to 4400 MHz
Fractional-N synthesizer and integer-N synthesizer
High resolution 38-bit modulus
The ADF4355-2 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 4400 MHz.
Low phase noise, 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 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
The ADF4355-2 has an integrated voltage controlled oscillator
(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.
3-wire serial interface
Analog and digital lock detect
APPLICATIONS
Control of all on-chip registers is through a simple 3-wire interface.
The ADF4355-2 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 ADF4355-2 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
RF
AV
DD
CE
DD
DD
P
SET
MULTIPLEXER
MUXOUT
10-BIT R
COUNTER
÷2
DIVIDER
REF
REF
A
B
IN
×2
DOUBLER
LOCK
DETECT
C
1
2
IN
REG
REG
C
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+
OUT
OUT
1/2/4/8
16/32/64
OUTPUT
STAGE
THIRD-ORDER
FRACTIONAL
INTERPOLATOR
÷
A–
PDB
RF
RF
B+
B–
OUTPUT
STAGE
OUT
N COUNTER
RF
OUT
MULTIPLEXER
SD
ADF4355-2
A
CP
A
GNDVCO
A
GND
GND
GND
GNDRF
Figure 1.
Rev. C
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