ADF4212L_15 Datasheet, PDF (1/28 Pages) Analog Devices – Dual Low Power PLL Frequency Synthesizer

Data Sheet
Dual Low Power PLL
Frequency Synthesizer
ADF4212L
FEATURES
GENERAL DESCRIPTION
IDD total: 7.5 mA
The ADF4212L is a dual frequency synthesizer that can be used
Bandwidth RF/IF: 2.4 GHz/1.0 GHz
to implement local oscillators (LO) in the up-conversion and
2.7 V to 3.3 V power supply
down-conversion sections of wireless receivers and transmitters.
Separate VP allows extended tuning voltage
It can provide the LO for both the RF and IF sections. It consists
Programmable dual modulus prescaler
of a low noise digital phase frequency detector (PFD), a precision
RF and IF: 8/9, 16/17, 32/33, 64/65
charge pump, a programmable reference divider, programmable
Programmable charge pump currents
3-wire serial interface
Analog and digital lock detect
Fastlock mode
Power-down mode
20-lead TSSOP and 20-lead LFCSP packages
A and B counters, and a dual modulus prescaler (P/P + 1). The
A (6-bit) and B (12-bit) counters, in conjunction with the dual
modulus prescaler (P/P + 1), implement an N divider (N = BP +
A). In addition, the 15-bit reference counter (R counter) allows
selectable REFIN frequencies at the PFD input. A complete phase-
locked loop (PLL) can be implemented if the synthesizer is used
APPLICATIONS
with external loop filters and voltage controlled oscillators (VCOs).
Wireless handsets (GSM, PCS, DCS, DSC1800, CDMA,
WCDMA)
Base stations for wireless Radio (GSM, PCS, DCS,
CDMA, WCDMA)
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 2.7 V to 3.3 V and can be powered
down when not in use.
Wireless LANS
Cable TV tuners (CATV)
Communications test equipment
FUNCTIONAL BLOCK DIAGRAM
V_DD1
V_DD2
V_P1
V_P2
R_SET
ADF4212L
IF_IN
IF
PRESCALER
REF_IN
CLK
DATA
LE
OSCILLATOR
22-BIT
DATA
REGISTER
SDOUT
12-BIT IF
B-COUNTER
6-BIT IF
A-COUNTER
15-BIT IF
R-COUNTER
15-BIT RF
R-COUNTER
IF PHASE
FREQUENCY
DETECTOR
REFERENCE
CHARGE
PUMP
CP_IF
IF
LOCK
DETECT
IF CURRENT
SETTING
IFCP3 IFCP2 IFCP1
OUTPUT
MUX
MUXOUT
RF
LOCK
DETECT
RFCP3 RFCP2 RFCP1
REFERENCE
RF_IN
RF
PRESCALER
12-BIT RF
B-COUNTER
6-BIT RF
A-COUNTER
RF PHASE
FREQUENCY
DETECTOR
DGND_RF AGND_RF
DGND_IF
AGND_IF
Figure 1.
CHARGE
PUMP
REFERENCE
R_SET
FL_O SWITCH
CP_RF
FL_O
Rev. E
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