18 GHz Microwave PLL Synthesizer
Data Sheet
FEATURES
18 GHz maximum RF input frequency
Integrated SiGe prescaler
Software compatible with the ADF4106/ADF4107/ADF4108
family of PLLs
2.85 V to 3.15 V PLL power supply
Programmable dual-modulus prescaler
8/9, 16/17, 32/33, 64/65
Programmable charge pump currents
3-wire serial interface
Digital lock detect
Hardware and software power-down mode
4000 V HBM/1500 V CDM ESD performance
APPLICATIONS
Microwave point-to-point/multipoint radios
Wireless infrastructure
VSAT radios
Test equipment
Instrumentation
GENERAL DESCRIPTION
The ADF41020 frequency synthesizer can be used to implement
local oscillators as high as 18 GHz in the up conversion and
down conversion 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 high frequency programmable feedback dividers
(A, B, and P). A complete phase-locked loop (PLL) can be
implemented if the synthesizer is used with an external loop
filter and voltage controlled oscillator (VCO). The synthesizer
can be used to drive external microwave VCOs via an active
loop filter. Its very high bandwidth means a frequency doubler
stage can be eliminated, simplifying system architecture and
reducing cost. The ADF41020 is software-compatible with the
existing ADF4106/ADF4107/ADF4108 family of devices from
Analog Devices, Inc. Their pinouts match very closely with
the exception of the ADF41020’s single-ended RF input pin,
meaning only a minor layout change is required when updating
current designs.
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
CLK
DATA
LE
REF
IN
RF
IN
24-BIT INPUT
REGISTER
AV
DD
DV
DD
CEGND GND
R COUNTER
R COUNTER
LATCH
FUNCTION
LATCH
A, B COUNTER
LATCH
P/P+ 1
N = 4(BP + A)
A AND B
M3 M2 M1
MUX
SD
OUT
AV
DD
HIGH-Z
MUXOUT
GND
R
SET
V
P
CP
PHASE
FREQUENCY
DETECTOR
LOCK
DETECT
REFERENCE
CHARGE
PUMP
CURRENT
SETTING 1
ADF41020
CPI3 CPI2 CPI1
CPI6 CPI5 CPI4
CURRENT
SETTING 2
50Ω
3pF
COUNTERS
DIVIDE
BY 4
10304-001
Rev. C Document Feedback
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