ADF4351 Datasheet, PDF (1/28 Pages) Analog Devices – Wideband Synthesizer

Data Sheet
Wideband Synthesizer
with Integrated VCO
ADF4351
FEATURES
GENERAL DESCRIPTION
Output frequency range: 35 MHz to 4400 MHz
Fractional-N synthesizer and integer-N synthesizer
Low phase noise VCO
Programmable divide-by-1/-2/-4/-8/-16/-32/-64 output
Typical jitter: 0.3 ps rms
Typical EVM at 2.1 GHz: 0.4%
Power supply: 3.0 V to 3.6 V
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
Switched bandwidth fast lock mode
Cycle slip reduction
The ADF4351 allows implementation of fractional-N or integer-N
phase-locked loop (PLL) frequency synthesizers when used with
an external loop filter and external reference frequency.
The ADF4351 has an integrated voltage controlled oscillator (VCO)
with a fundamental output frequency ranging from 2200 MHz to
4400 MHz. In addition, divide-by-1/-2/-4/-8/-16/-32/-64 circuits
allow the user to generate RF output frequencies as low as 35 MHz.
For applications that require isolation, the RF output stage can be
muted. The mute function is both pin- and software-controllable.
An auxiliary RF output is also available, which can be powered
down when not in use.
Control of all on-chip registers is through a simple 3-wire interface.
The device operates with a power supply ranging from 3.0 V to
3.6 V and can be powered down when not in use.
APPLICATIONS
Wireless infrastructure (W-CDMA, TD-SCDMA, WiMAX,
GSM, PCS, DCS, DECT)
Test equipment
Wireless LANs, CATV equipment
Clock generation
SDV_DD
FUNCTIONAL BLOCK DIAGRAM
AV_DD
DV_DD
V_P
R_SET V_VCO
REF_IN
CLK
DATA
LE
×2
DOUBLER
10-BIT R
COUNTER
÷2
DIVIDER
DATA REGISTER
FUNCTION
LATCH
INTEGER FRACTION MODULUS
VALUE
VALUE
VALUE
THIRD-ORDER
FRACTIONAL
INTERPOLATOR
N COUNTER
LOCK
DETECT
MULTIPLEXER
CHARGE
PUMP
PHASE
COMPARATOR
VCO
CORE
FAST LOCK
SWITCH
÷1/2/4/8/16/
32/64
OUTPUT
STAGE
OUTPUT
STAGE
MUXOUT
SW
LD
CP_OUT
V_TUNE
V_REF
V_COM
TEMP
RF_OUTA+
RF_OUTA–
PDB_RF
RF_OUTB+
RF_OUTB–
MULTIPLEXER
ADF4351
CE
AGND
DGND
CP_GND
SD_GND A_GNDVCO
Figure 1.
Rev. 0
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