LTC6945_15 datasheet(2/28 Pages) LINER

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LTC6945

6945fa

For more information www.linear.com/LTC6945

pin conFiguraTion

absoluTe MaxiMuM raTings

Supply Voltages

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

VCP+ 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)

LTC6945I ............................................... –40°C to 105°C

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

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

(Note 1)

9 10

TOP VIEW

GND

UFD PACKAGE

28-LEAD (4mm

× 5mm) PLASTIC QFN

11 12 13

28 27 26 25 24

VREFO+

REFO

STAT

SCLK

SDI

SDO

VD+

VVCO+

GND

VCO+

VCO–

TJMAX = 125°C, θJCbottom = 3°C/W, θJCtop = 26°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

JUNCTION TEMPERATURE RANGE

LTC6945IUFD#PBF

LTC6945IUFD#TRPBF

6945

28-Lead (4mm × 5mm) Plastic QFN

–40°C to 105°C

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

Consult LTC Marketing for information on non-standard 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/

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Reference Inputs (REF+, REF–)

fREF

Input Frequency

250

MHz

VREF

Input Signal Level

Single-Ended, 1µF AC-Coupling Capacitors

0.5

2.7

VP-P

Input Slew Rate

V/µs

Input Duty Cycle

Self-Bias Voltage

1.65

1.85

2.25

Input Resistance

Differential

6.2

8.4

11.6

kΩ

Input Capacitance

Differential

Reference Output (REFO)

fREFO

Output Frequency

250

MHz

PREFO

Output Power

fREFO = 10MHz, RLOAD = 50Ω

–0.2

3.2

dBm

Output Impedance, Disabled

800

elecTrical characTerisTics The

denotes the specifications which apply over the full operating

junction temperature range, otherwise specifications are at TA = 25°C. VREF+ = VREF0+ = VD+ = VRF+ = VVCO+ = 3.3V, VCP+ = 5V unless

otherwise specified. All voltages are with respect to GND.

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