LTC6948 View Datasheet(PDF) - Linear Technology

Part Name

Description

View to exact match

LTC6948

Ultralow Noise 0.37GHz to 6.39GHz Fractional-N Synthesizer with Integrated VCO

Linear Technology 

LTC6948

Absolute Maximum Ratings

(Note 1)

Supply Voltages

V+ (VREF+, VRF+, VD+) to GND................................3.6V

VCP+, VVCO+ to GND..............................................5.5V

Voltage on CP Pin..................GND – 0.3V to VCP+ + 0.3V

Voltage on all other Pins............GND – 0.3V to V+ + 0.3V

Operating Junction Temperature Range, TJ (Note 2)

LTC6948I............................................ –40°C to 105°C

Junction Temperature, TJMAX................................. 125°C

Storage Temperature Range................... –65°C to 150°C

Pin Configuration

TOP VIEW

28 27 26 25 24 23

REF+ 1

22 BVCO

STAT 2

21 GND

CS 3

SCLK 4

SDI 5

SDO 6

20 CMA

29

19 CMB

GND

18 CMC

17 GND

LDO 7

VD+ 8

9

16 TB

15 TUNE

10 11 12 13 14

UFD PACKAGE

28-LEAD (4mm × 5mm) PLASTIC QFN

TJMAX = 125°C, θJCbottom = 7°C/W

EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB

Order Information

LEAD FREE FINISH

TAPE AND REEL

PART MARKING PACKAGE DESCRIPTION

LTC6948IUFD-1#PBF LTC6948IUFD-1#TRPBF 69481

28-Lead (4mm × 5mm) Plastic QFN

LTC6948IUFD-2#PBF LTC6948IUFD-2#TRPBF 69482

28-Lead (4mm × 5mm) Plastic QFN

LTC6948IUFD-3#PBF LTC6948IUFD-3#TRPBF 69483

28-Lead (4mm × 5mm) Plastic QFN

LTC6948IUFD-4#PBF LTC6948IUFD-4#TRPBF 69484

28-Lead (4mm × 5mm) Plastic QFN

Consult LTC Marketing for parts specified with wider operating temperature ranges.

Consult LTC Marketing for information on nonstandard lead based finish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

JUNCTION TEMPERATURE RANGE

–40°C to 105°C

–40°C to 105°C

–40°C to 105°C

–40°C to 105°C

Available Options

VCO FREQUENCY

RANGE (GHz)

2.240 to 3.740

3.080 to 4.910

3.840 to 5.790

4.200 to 6.390

PACKAGE STYLE

QFN-28 (UFD28)

LTC6948IUFD-1

LTC6948IUFD-2

LTC6948IUFD-3

LTC6948IUFD-4

0 DIV = 6

0.373 to 0.623

0.513 to 0.818

0.640 to 0.965

0.700 to 1.065

OUTPUT FREQUENCY RANGE vs OUTPUT DIVIDER SETTING (GHz)

0 DIV = 5

0 DIV = 4

0 DIV = 3

0 DIV = 2

0.448 to 0.748 0.560 to 0.935 0.747 to 1.247 1.120 to 1.870

0.616 to 0.982 0.770 to 1.228 1.027 to 1.637 1.540 to 2.455

0.768 to 1.158 0.960 to 1.448 1.280 to 1.930 1.920 to 2.895

0.840 to 1.278 1.050 to 1.598 1.400 to 2.130 2.100 to 3.195

Overlapping Frequency Bands

0 DIV = 1

2.240 to 3.740

3.080 to 4.910

3.840 to 5.790

4.200 to 6.390

6948f

2

For more information www.linear.com/LTC6948

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