a
RF PLL Frequency Synthesizers
ADF4110/ADF4111/ADF4112/ADF4113
GENERAL DESCRIPTION
FEATURES
The ADF4110 family of frequency synthesizers can be used
to implement local oscillators in the upconversion and down-
conversion 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 (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 imple-
mented if the synthesizer is used with an external loop filter and
VCO (Voltage Controlled Oscillator).
ADF4110: 550 MHz
ADF4111: 1.2 GHz
ADF4112: 3.0 GHz
ADF4113: 4.0 GHz
2.7 V to 5.5 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 Antibacklash Pulsewidth
3-Wire Serial Interface
Analog and Digital Lock Detect
Hardware and Software Power-Down Mode
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
RSET
CPGND
REFERENCE
14-BIT
R COUNTER
REFIN
PHASE
FREQUENCY
DETECTOR
CHARGE
PUMP
CP
14
R COUNTER
LATCH
CLK
DATA
LE
24-BIT
INPUT REGISTER
FUNCTION
LATCH
LOCK
DETECT
CURRENT
SETTING 1
CURRENT
SETTING 2
22
A, B COUNTER
LATCH
SDOUT
CPI3 CPI2 CPI1 CPI6 CPI5 CPI4
19
FROM
FUNCTION
LATCH
HIGH Z
AVDD
13
MUX
MUXOUT
N = BP + A
13-BIT
B COUNTER
SDOUT
RFIN
A
LOAD
LOAD
PRESCALER
P/P +1
RFINB
6-BIT
A COUNTER
M3 M2 M1
ADF4110/ADF4111
ADF4112/ADF4113
6
CE
AGND
DGND
REV. 0
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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
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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© Analog Devices, Inc., 2000