ADF4217L Datasheet PDF - Analog Devices

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ADF4217L
Analog Devices

Part Number ADF4217L
Description Dual Low Power Frequency Synthesizers
Page 24 Pages


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a
Dual Low Power
Frequency Synthesizers
ADF4217L/ADF4218L/ADF4219L
FEATURES
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
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)
GENERAL DESCRIPTION
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, a
programmable reference divider, programmable A and B counters,
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).
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.
IFINA
IFINB
ADF4217L
ADF4218L
ONLY
REFIN
CLOCK
DATA
LE
RFINA
RFINB
FUNCTIONAL BLOCK DIAGRAM
ADF4219L ONLY
NC VDD1 VDD2
VP1
VP2
N = BP + A
IF
PRESCALER
BUFFER
11(13)-BIT IF
B COUNTER
6(5)-BIT IF
A COUNTER
PHASE
COMPARATOR
ADF4217L/
ADF4218L/
ADF4219L
CHARGE
PUMP
CPIF
IF
LOCK
DETECT
22-BIT
DATA SDOUT
REGISTER
14(15)-BIT IF
R COUNTER
14(15)-BIT RF
R COUNTER
OUTPUT
MUX
MUXOUT
RF
LOCK
DETECT
N = BP + A
RF
PRESCALER
11(13)-BIT RF
B COUNTER
6(5)-BIT RF
A COUNTER
PHASE
COMPARATOR
CHARGE
PUMP
CPRF
REV. C
FEATURES IN ( ) REFER TO ADF4219L
NC = NO CONNECT
DGNDRF AGNDRF DGNDIF AGNDIF
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 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved.

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