ADF4217_15 Datasheet, PDF (1/20 Pages) Analog Devices – Dual RF PLL Frequency Synthesizers

a
Dual RF PLL Frequency Synthesizers
ADF4216/ADF4217/ADF4218
FEATURES
GENERAL DESCRIPTION
ADF4216: 550 MHz/1.2 GHz
The ADF4216/ADF4217/ADF4218 are dual frequency synthe-
ADF4217: 550 MHz/2.0 GHz
sizers that can be used to implement local oscillators (LOs) in
ADF4218: 550 MHz/2.5 GHz
the upconversion and downconversion sections of wireless
2.7 V to 5.5 V Power Supply
receivers and transmitters. They can provide the LO for both
Selectable Charge Pump Currents
the RF and IF sections. They consist of a low-noise digital PFD
Selectable Dual Modulus Prescaler
(Phase Frequency Detector), a precision charge pump, a pro-
OBSOLETE IF: 8/9or16/17
RF: 32/33 or 64/65
3-Wire Serial Interface
Power-Down Mode
APPLICATIONS
Wireless Handsets (GSM, PCS, DCS, CDMA, WCDMA)
Base Stations for Wireless Radio (GSM, PCS, DCS,
CDMA, WCDMA)
Wireless LANS
Communications Test Equipment
CATV Equipment
grammable reference divider, programmable A and B counters,
and a dual-modulus prescaler (P/P+1). The A (6-bit) and B
(11-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 synthesizers are
used with an external loop filter and VCOs (Voltage Con-
trolled Oscillators).
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.
FUNCTIONAL BLOCK DIAGRAM
V_DD1 V_DD2 V_P1 V_P2
N = BP + A
ADF4216/ADF4217/ADF4218
IF_INA
IF_INB
IF
PRESCALER
11-BIT IF
B-COUNTER
PHASE
COMPARATOR
CHARGE
PUMP
CP_IF
6-BIT IF
A-COUNTER
IF
LOCK
DETECT
REF_IN
CLOCK
DATA
LE
OSCILLATOR
22-BIT
DATA
REGISTER
SDOUT
RF_INA
RF_INB
N = BP + A
RF
PRESCALER
14-BIT IF
R-COUNTER
14-BIT IF
R-COUNTER
11-BIT RF
B-COUNTER
6-BIT RF
A-COUNTER
OUTPUT
MUX
MUXOUT
RF
LOCK
DETECT
PHASE
COMPARATOR
CHARGE
PUMP
CP_RF
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.
DGND_RF AGND_RF DGND_IF DGND_IF AGND_IF
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone]
© Analog Devices, Inc., 2000