Dual Low Power
Frequency Synthesizers
a
ADF4217L/ADF4218L/ADF4219L
FEATURES
GENERAL DESCRIPTION
Total IDD: 7.1 mA
Bandwidth/RF 3.0 GHz
ADF4217L/ADF4218L, IF 1.1 GHz
ADF4219L, IF 1.0 GHz
2.6 V to 3.3 V Power Supply
1.8 V Logic Compatibility
Separate VP Allows Extended Tuning Voltage
Selectable Dual Modulus Prescaler
Selectable Charge Pump Currents
Charge Pump Current Matching of 1%
3-Wire Serial Interface
The ADF4217L/ADF4218L/ADF4219L are low power dual
frequency synthesizers that can be used to implement local
oscillators in the up-conversion and down-conversion sections
of wireless receivers and transmitters. They can provide the LO
for both the RF and IF sections. They consist of a low noise
digital PFD (phase frequency detector), a precision charge pump,
programmable reference divider, programmable A and B counters,
a
and a dual modulus prescaler (P/P + 1). The A and B 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 fre-
quencies at the PFD input. A complete PLL (phase-locked
loop) can be implemented if the synthesizers are used with an
external loop filter and VCOs (voltage controlled oscillators).
Power-Down Mode
APPLICATIONS
Wireless Handsets (GSM, PCS, DCS, CDMA, WCDMA)
Base Stations for Wireless Radio (GSM, PCS, DCS, WCDMA)
Wireless LANs
Communications Test Equipment
Cable TV Tuners (CATV)
Control of all the on-chip registers is via a simple 3-wire interface
with 1.8 V compatibility. The devices operate with a power supply
ranging from 2.6 V to 3.3 V and can be powered down when
not in use.
FUNCTIONAL BLOCK DIAGRAM
ADF4219L ONLY
NC
V
1
V
2
V 1
V 2
P
DD
DD
P
ADF4217L/
ADF4218L/
ADF4219L
N = BP + A
IF
11(13)-BIT IF
B COUNTER
PHASE
COMPARATOR
IF
A
IN
CHARGE
PUMP
PRESCALER
CP
IF
IF
B
IN
6(5)-BIT IF
A COUNTER
ADF4217L
ADF4218L
ONLY
IF
LOCK
DETECT
REF
BUFFER
IN
14(15)-BIT IF
R COUNTER
OUTPUT
MUX
MUXOUT
CLOCK
DATA
LE
22-BIT
DATA
REGISTER
SDOUT
RF
14(15)-BIT RF
R COUNTER
LOCK
DETECT
N = BP + A
CHARGE
PUMP
11(13)-BIT RF
B COUNTER
CP
RF
RF
RF
A
B
IN
RF
PHASE
COMPARATOR
PRESCALER
IN
6(5)-BIT RF
A COUNTER
DGND
AGND
DGND
AGND
IF
FEATURES IN ( ) REFERTO ADF4219L
NC = NO CONNECT
RF
RF
IF
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© 2003 Analog Devices, Inc. All rights reserved.
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