a
RF PLL Frequency Synthesizers
ADF4116/ADF4117/ADF4118
GENERAL DESCRIPTION
FEATURES
ADF4116: 550 MHz
ADF4117: 1.2 GHz
ADF4118: 3.0 GHz
2.7 V to 5.5 V Power Supply
Separate V P Allows Extended Tuning Voltage in 3 V
Systems
Selected Charge Pump Currents
Dual Modulus Prescaler
ADF4116: 8/9
ADF4117/ADF4118: 32/33
3-Wire Serial Interface
Digital Lock Detect
Power-Down Mode
Fast Lock Mode
The ADF4116 family of frequency synthesizers can be used
to implement local oscillators in the up-conversion and downconversion sections of wireless receivers and transmitters. They
consist 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 (5-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 synthesizer is used with an external loop filter and
VCO (Voltage Controlled Oscillator).
Control of all the on-chip registers is via a simple 3-wire interface.
The devices operate with a power supply ranging from 2.7 V to
5.5 V and can be powered down when not in use.
APPLICATIONS
Base Stations for Wireless Radio (GSM, PCS, DCS,
CDMA, WCDMA)
Wireless Handsets (GSM, PCS, DCS, CDMA, WCDMA)
Wireless LANS
Communications Test Equipment
CATV Equipment
FUNCTIONAL BLOCK DIAGRAM
AVDD
DVDD
VP
CPGND
REFERENCE
ADF4116/ADF4117/ADF4118
14-BIT
R COUNTER
REFIN
PHASE
FREQUENCY
DETECTOR
14
CHARGE
PUMP
CP
R COUNTER
LATCH
CLK
21-BIT
INPUT REGISTER
DATA
FUNCTION
LATCH
19
LOCK
DETECT
LE
SDOUT
A, B COUNTER
LATCH
18
FROM
FUNCTION LATCH
HIGH Z
AVDD
13
MUX
N = BP + A
RFINA
PRESCALER
P/P +1
RFINB
13-BIT
B COUNTER
MUXOUT
SDOUT
LOAD
LOAD
5-BIT
A COUNTER
M3
M2
M1
FLO
SWITCH
FLO
5
CE
AGND
DGND
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which 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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Tel: 781/329-4700
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© Analog Devices, Inc., 2000
