ADF4153 Datasheet, PDF (1/24 Pages) Analog Devices – Fractional-N Frequency Synthesizer

Fractional-N Frequency Synthesizer
ADF4153
FEATURES
GENERAL DESCRIPTION
RF bandwidth 500 MHz to 4 GHz
2.7 V to 3.3 V power supply
Separate VP allows extended tuning voltage
Programmable dual-modulus prescaler 4/5, 8/9
Programmable charge pump currents
3-wire serial interface
Analog and digital lock detect
Power-down mode
Pin compatible with the
ADF4110/ADF4111/ADF4112/ADF4113 and ADF4106
Programmable modulus on fractional-N synthesizer
Trade-off noise versus spurious performance
The ADF4153 is a fractional-N frequency synthesizer that
implements local oscillators in the upconversion and
downconversion sections of wireless receivers and transmitters.
It consists of a low noise digital phase frequency detector
(PFD), a precision charge pump, and a programmable reference
divider. There is a Σ-Δ based fractional interpolator to allow
programmable fractional-N division. The INT, FRAC, and
MOD registers define an overall N divider (N = (INT +
(FRAC/MOD))). In addition, the 4-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 with an external loop filter and a voltage
APPLICATIONS
controlled oscillator (VCO).
CATV equipment
Base stations for mobile radio (GSM, PCS, DCS,
CDMA, WCDMA)
Wireless handsets (GSM, PCS, DCS, CDMA, WCDMA)
Control of all on-chip registers is via a simple 3-wire interface.
The device 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
Communications test equipment
FUNCTIONAL BLOCK DIAGRAM
AV_DD DV_DD V_P SDV_DD
R_SET
ADF4153
REF_IN
MUXOUT
×2
DOUBLER
4-BIT
R COUNTER
HIGH Z
OUTPUT
MUX
V_DD
DGND
V_DD
R_DIV
N_DIV
LOCK
DETECT
THIRD ORDER
FRACTIONAL
INTERPOLATOR
REFERENCE
+ _PHASE
FREQUENCY
CHARGE
CP
DETECTOR
–
PUMP
CURRENT
SETTING
RFCP3 RFCP2 RFCP1
N-COUNTER
RF_INA
RF_INB
CLOCK
DATA
LE
24-BIT
DATA
REGISTER
FRACTION MODULUS
REG
REG
INTEGER
REG
AGND
DGND
Figure 1.
CPGND
Rev. A
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