LTC6948IUFD-1#TRPBF datasheet, PDF

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LTC6948IUFD-1#TRPBF: DescriptionIC FRACTIONAL-N PLL W/VCO 28QFN; Categorysemiconductor Analog mixed-signal IC; File Size494KB，38 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LTC6948IUFD-1#TRPBF Overview

IC FRACTIONAL-N PLL W/VCO 28QFN

LTC6948IUFD-1#TRPBF Parametric

Parameter Name	Attribute value
type	Clock/Frequency Synthesizer (RF/IF), Fractional-N
PLL	yes
enter	clock
output	clock
Number of circuits	1
Ratio - Input:Output	1：1
Differential - Input:Output	Yes Yes
Frequency - maximum	3.74GHz
Frequency divider/multiplier	yes/no
Voltage - Power	3.15 V ~ 5.25 V
Operating temperature	-40°C ~ 105°C
Installation type	surface mount
Package/casing	28-WFQFN Exposed Pad
Supplier device packaging	28-QFN（4x5）

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FeaTures

LTC6948

Ultralow Noise 0.37GHz to

6.39GHz Fractional-N Synthesizer

with Integrated VCO

DescripTion

The

LTC

6948

is a high performance, low noise, 6.39GHz

phase-locked loop (PLL) with a fully integrated VCO,

including a reference divider, phase-frequency detector

(PFD), ultralow noise charge pump, fractional feedback

divider, and VCO output divider.

The fractional divider uses an advanced, 4th order Δ∑

modulator which provides exceptionally low spurious

levels. This allows wide loop bandwidths, producing

extremely low integrated phase noise values.

The programmable VCO output divider, with a range of 1

through 6, extends the output frequency range.

Output Frequency Options

LTC6948-1

O_DIV = 1

O_DIV = 2

O_DIV = 3

O_DIV = 4

O_DIV = 5

O_DIV = 6

LTC6948-2

LTC6948-3

LTC6948-4

2.240 to 3.740 3.080 to 4.910 3.840 to 5.790 4.200 to 6.390

1.120 to 1.870 1.540 to 2.455 1.920 to 2.895 2.100 to 3.195

0.747 to 1.247 1.027 to 1.637 1.280 to 1.930 1.400 to 2.130

0.560 to 0.935 0.770 to 1.228 0.960 to 1.448 1.050 to 1.598

0.448 to 0.748 0.616 to 0.982 0.768 to 1.158 0.840 to 1.278

0.373 to 0.623 0.513 to 0.818 0.640 to 0.965 0.700 to 1.065

Low Noise Fractional-N PLL with Integrated VCO

No ∆-∑ Modulator Spurs

18-Bit Fractional Denominator

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

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

–157 dBc/Hz Wideband Output Phase Noise Floor

Excellent Integer Boundary Spurious Performance

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

Output Buffer Muting

Reference Input Frequency Up to 425MHz

Fast Frequency Switching

FracNWizard™ Software Design Tool Support

applicaTions

Wireless Basestations (LTE, WiMAX, W-CDMA, PCS)

Microwave Data Links

Military and Secure Radio

Test and Measurement

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

FracNWizard is a trademark of Analog Devices, Inc. All other trademarks are the property of

their respective owners.

Typical applicaTion

6.3GHz Wideband Receiver

1.6nF

76.8

1µF

10µH

76.8

–90

1µF

GND

REF

–

REF+

CP+

GND

VCO+

REF

STAT

SCLK

SDI

SDO

LDO

D+

BVCO

GND

TUNE

1µF

2.2µF

0.01µF

56nF

0.01µF

PHASE NOISE (dBc/Hz)

1µF

–100

–110

–120

–130

RMS NOISE = 0.412°

–140 RMS JITTER = 183fs

PFD

= 50MHz

–150 LOOP BW = 186kHz

INTN = 0

CPLE = 1

–160

100

10k

100k

OFFSET FREQUENCY (Hz)

0.1µF 3.3V

2.4nF

LTC6948-4 Phase Noise,

= 6236MHz

100MHz

51.1

SPI BUS

0.1µF

LTC6948-4

MUTE

RF+

GND

–

3.3V

0.1µF

UNUSED OUTPUT

AVAILABLE FOR

OTHER USE

3.3V

68nH

3.3V

0.01µF

100pF

R = 2, f

PFD

= 50MHz

N = 84 TO 127.8

LBW = 186kHz

O=1

10M 40M

6946 TA01b

0.1µF

68nH 100pF

= 4200MHz TO 6390MHz IN 190.7Hz STEPS

RF INPUT SIGNAL

LO IF

IF OUTPUT

6948 TA01a

6948fa

For more information

www.linear.com/LTC6948

LTC6948IUFD-1#TRPBF Related Products

	LTC6948IUFD-1#TRPBF	LTC6948IUFD-2#TRPBF	LTC6948IUFD-3#TRPBF	LTC6948IUFD-4#TRPBF	LTC6948IUFD-2#PBF	LTC6948IUFD-3#PBF	LTC6948IUFD-1#PBF	LTC6948IUFD-4#PBF
Description	IC FRACTIONAL-N PLL W/VCO 28QFN	IC FRACTIONAL-N PLL W/VCO 28QFN	IC FRACTIONAL-N PLL W/VCO 28QFN	IC FRACTIONAL-N PLL W/VCO 28QFN	IC FRACTIONAL-N PLL W/VCO 28QFN	IC FRACTIONAL-N PLL W/VCO 28QFN	IC FRACTIONAL-N PLL W/VCO 28QFN	IC FRACTIONAL-N PLL W/VCO 28QFN
type	Clock/Frequency Synthesizer (RF/IF), Fractional-N	Clock/Frequency Synthesizer (RF/IF), Fractional-N	Clock/Frequency Synthesizer (RF/IF), Fractional-N	Clock/Frequency Synthesizer (RF/IF), Fractional-N	Clock/Frequency Synthesizer (RF/IF), Fractional-N	Clock/Frequency Synthesizer (RF/IF), Fractional-N	Clock/Frequency Synthesizer (RF/IF), Fractional-N	-
PLL	yes	yes	yes	yes	yes	yes	yes	-
enter	clock	clock	clock	clock	clock	clock	clock	-
output	clock	clock	clock	clock	clock	clock	clock	-
Number of circuits	1	1	1	1	1	1	1	-
Ratio - Input:Output	1：1	1：1	1：1	1：1	1：1	1：1	1：1	-
Differential - Input:Output	Yes Yes	Yes Yes	Yes Yes	Yes Yes	Yes Yes	Yes Yes	Yes Yes	-
Frequency - maximum	3.74GHz	4.91GHz	5.79GHz	6.39GHz	4.91GHz	5.79GHz	3.74GHz	-
Frequency divider/multiplier	yes/no	yes/no	yes/no	yes/no	yes/no	yes/no	yes/no	-
Voltage - Power	3.15 V ~ 5.25 V	3.15 V ~ 5.25 V	3.15 V ~ 5.25 V	3.15 V ~ 5.25 V	3.15 V ~ 5.25 V	3.15 V ~ 5.25 V	3.15 V ~ 5.25 V	-
Operating temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-
Installation type	surface mount	surface mount	surface mount	surface mount	surface mount	surface mount	surface mount	-
Package/casing	28-WFQFN Exposed Pad	28-WFQFN Exposed Pad	28-WFQFN Exposed Pad	28-WFQFN Exposed Pad	28-WFQFN Exposed Pad	28-WFQFN Exposed Pad	28-WFQFN Exposed Pad	-
Supplier device packaging	28-QFN（4x5）	28-QFN（4x5）	28-QFN（4x5）	28-QFN（4x5）	28-QFN（4x5）	28-QFN（4x5）	28-QFN（4x5）	-

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