Integer-N/Fractional-N PLL Synthesizer
Data Sheet
ADF4155
FEATURES
GENERAL DESCRIPTION
Input frequency range: 500 MHz to 8000 MHz
Fractional-N synthesizer and integer-N synthesizer
Phase frequency detector (PFD) up to 125 MHz
High resolution 38-bit modulus
The ADF4155 allows implementation of fractional-N or
integer-N phase-locked loop (PLL) frequency synthesizers
when used with an external loop filter, external voltage
controlled oscillator (VCO), and external reference frequency.
Separate charge pump supply (VP) allows extended tuning
voltage in 5 V systems
Programmable divide by 1, 2, 4, 8, 16, 32, or 64 output
Differential and single-ended reference inputs
Power supply: 3.3 V 5%
The ADF4155 is for use with external VCO parts up to an
8 GHz operating frequency. The high resolution programmable
modulus allows synthesis of exact frequencies with 0 Hz error.
The VCO frequency can be divided by 1, 2, 4, 8, 16, 32, or 64 to
allow the user to generate RF output frequencies as low as
7.8125 MHz.
Logic compatibility: 1.8 V
Programmable dual-modulus prescaler (P) of 4/5 or 8/9
Programmable output power level
3-wire serial interface
Control of all on-chip registers is through a simple 3-wire
interface. The device operates with a nominal power supply of
3.3 V 5% and can be powered down when not in use.
Analog and digital lock detect
APPLICATIONS
The ADF4155 is available in a 24-lead, 4 mm × 4 mm LFCSP
package.
Wireless infrastructure (W-CDMA, TD-SCDMA, WiMAX, GSM,
PCS, DCS, DECT)
Point to point/point to multipoint microwave links
Test equipment
Wireless LANs, CATV equipment
Clock generation
FUNCTIONAL BLOCK DIAGRAM
AV
DV
V
RFV
DD
R
SET
DD
DD
P
MULTIPLEXER
MUXOUT
10-BIT R
COUNTER
÷2
DIVIDER
REF
+
–
IN
×2
DOUBLER
LOCK
DETECT
REF
IN
CLK
DATA
LE
DATA REGISTER
FUNCTION
LATCH
CHARGE
PUMP
CP
OUT
PHASE
COMPARATOR
CE
C
1
2
REG
C
REG
ADF4155
INTEGER
REG
FRACTION
REG
MODULUS
REG
RF
RF
+
–
OUT
OUT
OUTPUT
STAGE
THIRD-ORDER
÷ 1/2/4/8/16/32/64
FRACTIONAL
INTERPOLATOR
PDB
RF
N COUNTER
RF
+
INPUT
STAGE
IN
IN
RF
–
A
D
CP
GND
RF
GND
GND
GND
Figure 1.
Rev. 0
Document Feedback
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rightsof third parties that may result fromits use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks andregisteredtrademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Technical Support
©2014 Analog Devices, Inc. All rights reserved.
www.analog.com
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