PLL Frequency Synthesizer
ADF4106
FEATURES
6.0 GHz Bandwidth
2.7 V to 3.3 V Power Supply
Separate Charge Pump Supply (V
P
) 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 Antibacklash Pulsewidth
3-Wire Serial Interface
Analog and Digital Lock Detect
Hardware and Software Power-Down Modes
APPLICATIONS
Broadband Wireless Access
Instrumentation
Wireless LANs
Base Stations for Wireless Radio
GENERAL DESCRIPTION
The ADF4106 frequency synthesizer can be used to implement
local oscillators in the upconversion and downconversion 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
REF
IN
frequencies at the PFD input. A complete PLL (phase-
locked loop) can be implemented if the synthesizer 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.
FUNCTIONAL BLOCK DIAGRAM
AV
DD
DV
DD
V
P
CPGND
R
SET
REFERENCE
REF
IN
14-BIT
R COUNTER
PHASE
FREQUENCY
DETECTOR
CHARGE
PUMP
CP
14
R COUNTER
LATCH
CLK
DATA
LE
24-BIT INPUT
REGISTER
22
FUNCTION
LATCH
CPI3 CPI2 CPI1
CPI6 CPI5 CPI4
LOCK
DETECT
CURRENT
SETTING 1
CURRENT
SETTING 2
FROM
FUNCTION
LATCH
AB COUNTER
LATCH
HIGH Z
19
13
AV
DD
MUX
MUXOUT
N = BP + A
13-BIT
B COUNTER
LOAD
RF
IN
A
RF
IN
B
PRESCALER
P/P + 1
LOAD
6-BIT
A COUNTER
SD
OUT
M3 M2 M1
ADF4106
6
REV. A
CE
AGND
DGND
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reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
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Tel: 781/329-4700
Fax: 781/326-8703
© 2003 Analog Devices, Inc. All rights reserved.
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