Phase Detector/Frequency Synthesizer
ADF4002
FEATURES
GENERAL DESCRIPTION
400 MHz bandwidth
2.7 V to 3.3 V power supply
Separate charge pump supply (VP) allows extended
tuning voltage in 3 V systems
Programmable charge pump currents
3-wire serial interface
Analog and digital lock detect
Hardware and software power-down mode
200 MHz phase detector
The ADF4002 frequency synthesizer is used to implement local
oscillators in the upconversion and downconversion sections of
wireless receivers and transmitters. It consists of a low-noise
digital phase frequency detector (PFD), a precision charge
pump, a programmable reference divider, and programmable
N divider. The 14-bit reference counter (R counter), allows
selectable REFIN frequencies at the PFD input. A complete
phase-locked loop (PLL) can be implemented if the synthesizer
is used with an external loop filter and voltage controlled
oscillator (VCO). In addition, by programming R and N to 1,
the part can be used as a stand alone PFD and charge pump.
APPLICATIONS
Clock conditioning
Clock generation
IF LO generation
FUNCTIONAL BLOCK DIAGRAM
AV
DV
R
SET
V
CPGND
DD
DD
P
REFERENCE
14-BIT
R COUNTER
PHASE
FREQUENCY
DETECTOR
REF
CHARGE
PUMP
IN
CP
14
R COUNTER
LATCH
LOCK
DETECT
CURRENT
SETTING 2
CURRENT
SETTING 1
CLK
DATA
LE
24-BIT INPUT
REGISTER
FUNCTION
LATCH
CPI6 CPI5 CPI4
HIGH Z
CPI3 CPI2 CPI1
22
N COUNTER
LATCH
SD
OUT
AV
DD
MUXOUT
MUX
SD
OUT
RF
RF
A
B
13-BIT
N COUNTER
IN
IN
M3 M2 M1
ADF4002
CE
AGND DGND
Figure 1.
Rev. 0
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