ADF4217L_15 Datasheet, PDF (1/24 Pages) Analog Devices – Dual Low Power Frequency Synthesizers

a
Dual Low Power
Frequency Synthesizers
ADF4217L/ADF4218L/ADF4219L
FEATURES
Total I_DD: 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 V_P 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.
IF_INA
IF_INB
ADF4217L
ADF4218L
ONLY
REF_IN
CLOCK
DATA
LE
RF_INA
RF_INB
FUNCTIONAL BLOCK DIAGRAM
ADF4219L ONLY
NC
V_DD1 V_DD2
V_P1
V_P2
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
CP_IF
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
CP_RF
REV. C
FEATURES IN ( ) REFER TO ADF4219L
NC = NO CONNECT
DGND_RF AGND_RF DGND_IF AGND_IF
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