LMX2485E datasheet(6/46 Pages) TI1

tên linh kiện	LMX2485E

Giải thích chi tiết về linh kiện	3-GHz Delta-Sigma Low-Power Dual PLLatinum Frequency Synthesizer

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LMX2485, LMX2485E

SNAS236G – OCTOBER 2005 – REVISED JANUARY 2016

www.ti.com

Electrical Characteristics (continued)

(VCC = 3.0V; -40°C ≤ TA ≤ +85°C unless otherwise specified)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Magnitude of IF CP sink vs CP

VCPoutIF = VCC/2

| ICPoutIF%MIS |

1%

8%

source mismatch

TA = 25°C

Magnitude of IF CP current vs

0.5

≤ VCPoutIF ≤ VCC -0.5

| ICPoutIF%V |

4%

10%

CP voltage

TA = 25°C

Magnitude of IF CP current vs

| ICPoutIF%TEMP

VCPoutIF = VCC/2

4%

temperature

OSCILLATOR PARAMETERS

OSC2X = 0

5

110

MHz

fOSCin

Oscillator operating frequency

OSC2X = 1

5

20

MHz

vOSCin

Oscillator input sensitivity

0.5

VCC

VP-P

IOSCin

Oscillator input current

–100

100

µA

SPURS

Spurs in band

See (4)

–55

dBc

PHASE NOISE

RF_CPG = 0

–202

RF_CPG = 1

–202

RF synthesizer normalized

LF1HzRF

RF_CPG = 3

–206

dBc/Hz

phase noise contribution(5)

RF_CPG = 7

–208

RF_CPG = 15

–210

IF synthesizer normalized phase

LF1HzIF

–209

dBc/Hz

noise contribution

DIGITAL INTERFACE (DATA, CLK, LE, ENOSC, CE, Ftest/LD, FLoutRF)

VIH

High-level input voltage

1.6

VCC

V

VIL

Low-level input voltage

0.4

V

IIH

High-level input current

VIH = VCC

–1

1

µA

IIL

Low-level input current

VIL = 0 V

–1

1

µA

VOH

High-level output voltage

IOH = –500 µA

VCC - 0.4

V

VOL

Low-level output voltage

IOL = 500 µA

0.4

V

(4)

To measure the in-band spur, the fractional word is chosen such that when reduced to lowest terms, the fractional numerator is one.

The spur offset frequency is chosen to be the comparison frequency divided by the reduced fractional denominator. The loop bandwidth

must be sufficiently wide to negate the impact of the loop filter. Measurement conditions are: Spur Offset Frequency = 10 kHz, Loop

Bandwidth = 100 kHz, Fraction = 1/2000, Comparison Frequency = 20 MHz, RF_CPG = 7, DITH = 0, and a 4th Order Modulator (FM =

0). These are relatively consistent over tuning range.

(5)

Normalized Phase Noise Contribution is defined as: LN(f) = L(f) – 20log(N) – 10log(fCOMP) where L(f) is defined as the single side band

phase noise measured at an offset frequency, f, in a 1 Hz Bandwidth. The offset frequency, f, must be chosen sufficiently smaller than

the PLL loop bandwidth, yet large enough to avoid substantial phase noise contribution from the reference source. Measurement

conditions are: Offset Frequency = 11 kHz, Loop Bandwidth = 100 kHz for RF_CPG = 7, Fraction = 1/2000, Comparison Frequency =

20 MHz, FM = 0, DITH = 0.

6

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	LMX2485	868Kb / 37P	50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum??Frequency Synthesizers with 800 MHz Integer PLL
Texas Instruments	LMX2485	1Mb / 43P	[Old version datasheet] 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum??Frequency Synthesizers with 800 MHz Integer PLL
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