a
PLL Frequency Synthesizer
ADF4106
GENERAL DESCRIPTION
FEATURES
The ADF4106 frequency synthesizer can be used to implement
local oscillators in the up-conversion and down-conversion
sections of wireless receivers and transmitters. It consists of a
low-noise digital PFD (Phase Frequency Detector), a precision
charge pump, a programmable reference divider, programmable
A and B counters and a dual-modulus prescaler (P/P + 1). The
A (6-bit) and B (13-bit) counters, in conjunction with the dual
modulus prescaler (P/P + 1), implement an N divider (N = BP + A).
In addition, the 14-bit reference counter (R Counter), allows
selectable REFIN frequencies at the PFD input. A complete
PLL (Phase-Locked Loop) can be implemented if the synthe-
sizer is used with an external loop filter and VCO (Voltage
Controlled Oscillator). Its very high bandwidth means that
frequency doublers can be eliminated in many high-frequency
systems, simplifying system architecture and lowering cost.
6.0 GHz Bandwidth
2.7 V to 3.3 V Power Supply
Separate Charge Pump Supply (VP) Allows Extended
Tuning Voltage in 3 V Systems
Programmable Dual Modulus Prescaler
8/9, 16/17, 32/33, 64/65
Programmable Charge Pump Currents
Programmable Anti-Backlash Pulsewidth
3-Wire Serial Interface
Analog and Digital Lock Detect
Hardware and Software Power-Down Mode
APPLICATIONS
Broadband Wireless Access
Instrumentation
Wireless LANS
Base Stations For Wireless Radio
FUNCTIONAL BLOCK DIAGRAM
AV
V
P
DV
CPGND
R
SET
DD
DD
REFERENCE
14-BIT
R COUNTER
REF
PHASE
FREQUENCY
DETECTOR
IN
CHARGE
PUMP
CP
14
R COUNTER
LATCH
LOCK
DETECT
CURRENT
SETTING 1
CURRENT
SETTING 2
CLK
DATA
LE
24-BIT INPUT
REGISTER
FUNCTION
LATCH
CPI3 CPI2 CPI1
CPI6 CPI5 CPI4
HIGH Z
22
AB COUNTER
LATCH
FROM
FUNCTION
LATCH
19
AV
DD
MUXOUT
MUX
13
SD
OUT
N = BP + A
13-BIT
B COUNTER
LOAD
M3 M2 M1
RF
A
B
IN
PRESCALER
P/P + 1
RF
IN
LOAD
6-BIT
A COUNTER
ADF4106
6
CE
AGND DGND
REV. 0
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use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
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© Analog Devices, Inc., 2001