ADF41513 datasheet(1/33 Pages) AD

Il numero della parte	ADF41513

Spiegazioni elettronici	Integer N/Fractional-N, PLL Synthesizer

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Produttore elettronici	AD [Analog Devices]

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26.5 GHz, Integer N/Fractional-N,

PLL Synthesizer

Preliminary Technical Data

ADF41513

Rev. PrL

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Tel: 781.329.4700

Technical Support

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FEATURES

1 GHz to 26.5 GHz bandwidth

Ultralow noise PLL

Integer N: −234 dBc/Hz, fractional-N: −231 dBc/Hz

High maximum PFD frequency

Integer N: 250 MHz, fractional-N: 125 MHz

25-bit fixed/49-bit variable fractional modulus mode

Single-ended reference input

3.3 V power supply, 3.3 V charge pump

Integrated 1.8 V logic capability

Phase resync

Programmable charge pump currents: 16× range

Digital lock detect

3-wire serial interface with register readback option

Hardware and software power-down mode

APPLICATIONS

Test equipment and instrumentation

Wireless infrastructure

Microwave point to point and multipoint radios

VSAT radios

GENERAL DESCRIPTION

The ADF41513 is an ultralow noise frequency synthesizer that

can be used to implement local oscillators (LOs) as high as

26.5 GHz in the upconversion and downconversion sections of

wireless receivers and transmitters.

The ADF41513 is designed on a high performance silicon

geranium (SiGe), bipolar complementary metal-oxide

semiconductor (BiCMOS) process, achieving a normalized

phase noise floor of −234 dBc/Hz. The phase frequency

detector (PFD) operates up to 250 MHz (integer N mode)/

125 MHz (fractional-N mode) for improved phase noise and

spur performance. The variable modulus, ∑-Δ modulator allows

extremely fine resolution when using a 49-bit divide value. The

ADF41513 can be used as either an integer N phase-locked loop

(PLL) or fractional-N PLL with either a fixed modulus for

subhertz frequency resolution or variable modulus for subhertz

exact frequency resolution.

A complete PLL is implemented when the synthesizer is used

with an external loop filter and voltage controlled oscillator

(VCO). The 26.5 GHz bandwidth means a frequency doubler or

divider stage can be eliminated, simplifying system architecture

and reducing cost. The ADF41513 is packaged in a compact,

24-lead, 4 mm × 4 mm LFCSP.

FUNCTIONAL BLOCK DIAGRAM

LOCK

DETECT

CP

DATA

LE

32-BIT

DATA

REGISTER

CLK

DVDD

DGND

RDIV

AVDD

SDOUT

N

AVDD1

AVDD2

AVDD3

AVDD4

AVDD5

CREG1

GND

CREG2

VP

CE

RFINA

RFINB

OUTPUT

MUX

MUXOUT

–

+

HIGH-Z

PHASE

FREQUENCY

DETECTOR

ADF41513

25-BIT FIXED/49-BIT VARIABLE

FRACTIONAL INTERPOLATOR

FRACTION

VALUE

INTEGER

VALUE

CHARGE

PUMP

1.8V

REGULATOR

TXDATA

REFERENCE

RSET

REFIN

×2

DOUBLER

5-BIT

R COUNTER

÷2

DIVIDER

MODULUS

225 VALUE

N COUNTER

+

–

DLD

DC1

DC2

CSR

Figure 1.

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