|ADF4156BRUZ-RL||6 GHz Fractional-N Frequency Synthesizer|
|ADF4156BRUZ-RL Datasheet PDF : 24 Pages |
6 GHz Fractional-N Frequency Synthesizer
RF bandwidth to 6 GHz
2.7 V to 3.3 V power supply
Separate VP allows extended tuning voltage
Programmable fractional modulus
Programmable charge pump currents
3-wire serial interface
Digital lock detect
Pin compatible with
ADF4153 and ADF4154 frequency synthesizers
Programmable RF output phase
Loop filter design possible with ADISimPLL
Cycle slip reduction for faster lock times
Base stations for mobile radio (WiMAX, GSM, PCS, DCS,
SuperCell 3G, CDMA, WCDMA)
Wireless handsets (GSM, PCS, DCS, CDMA, WCDMA)
Wireless LANs, PMR
Communications test equipment
The ADF4156 is a 6 GHz 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 sigma-delta (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))). The RF output phase is programmable for
applications that require a particular phase relationship between
the output and the reference. The ADF4156 also features cycle
slip reduction circuitry leading to faster lock times without the
need for modifications to the loop filter.
Control of all on-chip registers is via a simple 3-wire interface.
The device operates with a power supply ranging from 2.7 V to
3.3 V and can be powered down when not in use.
FUNCTIONAL BLOCK DIAGRAM
AVDD DVDD VP
RFCP4 RFCP3 RFCP2 RFCP1
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