LTC6945IUFD#TRPBF datasheet, PDF

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LTC6945IUFD#TRPBF: DescriptionIC SYNTHESIZER INTEGER N 28QFN; CategoryAnalog mixed-signal IC The signal circuit; File Size367KB，28 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LTC6945IUFD#TRPBF Overview

IC SYNTHESIZER INTEGER N 28QFN

LTC6945IUFD#TRPBF Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	conform to
Parts packaging code	QFN
package instruction	HVQCCN, LCC28,.16X.2,20
Contacts	28
Manufacturer packaging code	UFD
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	PLL FREQUENCY SYNTHESIZER
JESD-30 code	R-PQCC-N28
JESD-609 code	e3
length	5 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	28
Maximum operating temperature	105 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	HVQCCN
Encapsulate equivalent code	LCC28,.16X.2,20
Package shape	RECTANGULAR
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
power supply	3.3,5 V
Certification status	Not Qualified
Maximum seat height	0.8 mm
Maximum supply current (Isup)	125 mA
Maximum supply voltage (Vsup)	3.45 V
Minimum supply voltage (Vsup)	3.15 V
Nominal supply voltage (Vsup)	3.3 V
surface mount	YES
technology	CMOS
Temperature level	INDUSTRIAL
Terminal surface	Matte Tin (Sn)
Terminal form	NO LEAD
Terminal pitch	0.5 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	NOT SPECIFIED
width	4 mm
Base Number Matches	1

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FeaTures

LTC6945

Ultralow Noise and Spurious

0.35GHz to 6GHz Integer-N

Synthesizer

DescripTion

The

LTC

6945

is a high performance, low noise, 6GHz phase-

locked loop (PLL), including a reference divider, phase-

frequency detector (PFD) with phase-lock indicator, charge

pump, integer feedback divider and VCO output divider.

The part features a buffered, programmable VCO output

divider with a range of 1 through 6. The differential, low

noise output buffer has user-programmable output power

ranging from –6dBm to 3dBm, and may be muted through

either a digital input pin or software.

The low noise reference buffer outputs a typical 0dBm

square wave directly into a 50Ω impedance from 10MHz

to 250MHz, or may be disabled through software.

The ultralow noise charge pump contains selectable high

and low voltage clamps useful for VCO monitoring, and

also may be set to provide a V

/2 bias.

All device settings are controlled through a SPI-compatible

serial port.

LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

PLLWizard is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

Low Noise Integer-N PLL

350MHz to 6GHz VCO Input Range

–226dBc/Hz Normalized In-Band Phase Noise Floor

–274dBc/Hz Normalized In-Band 1/f Noise

–157dBc/Hz Wideband Output Phase Noise Floor

Excellent Spurious Performance

Output Divider (1 to 6, 50% Duty Cycle)

Low Noise Reference Buffer

Output Buffer Muting

Charge Pump Supply from 3.15V to 5.25V

Charge Pump Current from 250µA to 11.2mA

Configurable Status Output

SPI Compatible Serial Port Control

PLLWizard™ Software Design Tool Support

applicaTions

Wireless Base Stations (LTE, WiMAX, W-CDMA, PCS)

Broadband Wireless Access

Microwave Data Links

Military and Secure Radio

Test and Measurement

Typical applicaTion

LTC6945 Data Converter Sample Clock

LOOP

3.3V

BANDWIDTH

0.1µF

~2.3kHz

51.1

1µF

REF

–

REF

REF+

CP V

CP+

GND

REFO+

VCO+

REFO

STAT

SPI BUS

SCLK

SDI

SDO

3.3V

0.1µF

PFD

= 25MHz

LTC6945

GND

CO+

100pF

1.0µF

16.5

100pF

16.5

3.3V 0.01µF

PHASE NOISE (dBc/Hz)

0.1µF

432

570nF

TUNE

47nF

CRYSTEK

CVCSO-914-1000

1GHz Sample Clock Phase Noise

–100

–110

–120

–130

–140

–150

–160

–170

–180

100

10k

100k

OFFSET FREQUENCY (Hz)

10M 40M

6945 TA01b

100MHz

REF

1µF

3.3V

0.1µF

DSB INTEGRATION

(100Hz TO 1GHz)

RMS NOISE = 0.014°

RMS JITTER = 39fs

PFD

= 25MHz

BW = 2.3kHz

D+

CO–

MUTE

GND RF

–

RF+

68nH

100pF

68nH

16.5

100pF

SAMPLE CLOCK

1GHz, 7dBm

6945 TA01b

3.3V

3.3V 0.01µF

3.3V

100pF

ALT SAMPLE CLOCK

500MHz OR 1GHz

6945fa

For more information

www.linear.com/LTC6945

LTC6945IUFD#TRPBF Related Products

	LTC6945IUFD#TRPBF	LTC6945IUFD#PBF
Description	IC SYNTHESIZER INTEGER N 28QFN	IC SYNTHESIZER INTEGER N 28QFN
Brand Name	Linear Technology	Linear Technology
Is it Rohs certified?	conform to	conform to
Parts packaging code	QFN	QFN
package instruction	HVQCCN, LCC28,.16X.2,20	HVQCCN, LCC28,.16X.2,20
Contacts	28	28
Manufacturer packaging code	UFD	UFD
Reach Compliance Code	compliant	compliant
ECCN code	EAR99	EAR99
Analog Integrated Circuits - Other Types	PLL FREQUENCY SYNTHESIZER	PLL FREQUENCY SYNTHESIZER
JESD-30 code	R-PQCC-N28	R-PQCC-N28
JESD-609 code	e3	e3
length	5 mm	5 mm
Humidity sensitivity level	1	1
Number of functions	1	1
Number of terminals	28	28
Maximum operating temperature	105 °C	105 °C
Minimum operating temperature	-40 °C	-40 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	HVQCCN	HVQCCN
Encapsulate equivalent code	LCC28,.16X.2,20	LCC28,.16X.2,20
Package shape	RECTANGULAR	RECTANGULAR
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED	NOT SPECIFIED
power supply	3.3,5 V	3.3,5 V
Certification status	Not Qualified	Not Qualified
Maximum seat height	0.8 mm	0.8 mm
Maximum supply current (Isup)	125 mA	125 mA
Maximum supply voltage (Vsup)	3.45 V	3.45 V
Minimum supply voltage (Vsup)	3.15 V	3.15 V
Nominal supply voltage (Vsup)	3.3 V	3.3 V
surface mount	YES	YES
technology	CMOS	CMOS
Temperature level	INDUSTRIAL	INDUSTRIAL
Terminal surface	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	NO LEAD	NO LEAD
Terminal pitch	0.5 mm	0.5 mm
Terminal location	QUAD	QUAD
Maximum time at peak reflow temperature	NOT SPECIFIED	NOT SPECIFIED
width	4 mm	4 mm
Base Number Matches	1	1

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