SKY72310-362LF datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > Analog mixed-signal IC> The signal circuit> SKY72310-362LF

SKY72310-362LF: DescriptionPhase Locked Loop, 4 X 4 MM, ROHS COMPLIANT, QFN-24; CategoryAnalog mixed-signal IC The signal circuit; File Size207KB，19 Pages; ManufacturerSkyworks; Websitehttp://www.skyworksinc.com; Environmental Compliance

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SKY72310-362LF Overview

Phase Locked Loop, 4 X 4 MM, ROHS COMPLIANT, QFN-24

SKY72310-362LF Parametric

Parameter Name	Attribute value
Is it lead-free?	Lead free
Is it Rohs certified?	conform to
Parts packaging code	QFN
package instruction	QFN-24
Contacts	24
Reach Compliance Code	unknown
Other features	IT IS ALSO AVAILABLE IN DIVIDE RATIO 32 TO 543 IN INTEGER-N MODE
Analog Integrated Circuits - Other Types	PHASE LOCKED LOOP
JESD-30 code	S-XQCC-N24
length	4 mm
Humidity sensitivity level	3
Number of functions	1
Number of terminals	24
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	UNSPECIFIED
encapsulated code	HVQCCN
Package shape	SQUARE
Package form	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1 mm
Maximum supply voltage (Vsup)	3.3 V
Minimum supply voltage (Vsup)	2.7 V
Nominal supply voltage (Vsup)	3 V
surface mount	YES
Temperature level	INDUSTRIAL
Terminal form	NO LEAD
Terminal pitch	0.5 mm
Terminal location	QUAD
Maximum time at peak reflow temperature	40
width	4 mm
Base Number Matches	1

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DATA SHEET

SKY72310: Spur-Free, 2.1 GHz Single Fractional-N Frequency

Synthesizer

Applications

•

General purpose RF systems

•

2.5G and 3G wireless infrastructure

•

Broadband wireless access

•

Low bit rate wireless telemetry

•

Instrumentation

•

L-band receivers

•

Satellite communications

Description

Skyworks SKY72310 fractional-N frequency synthesizer provides

ultra-fine frequency resolution, fast switching speed, and low

phase-noise performance. This synthesizer is a key building block

for high-performance radio system designs that require low

power and fine step size.

The ultra-fine step size of less than 100 Hz allows this synthesizer

to be used in very narrowband wireless applications. With proper

temperature sensing or through control channels, the

synthesizer’s fine step size can compensate for crystal oscillator

or Intermediate Frequency (IF) filter drift. As a result, crystal

oscillators or crystals can replace temperature-compensated or

ovenized crystal oscillators, reducing parts count and associated

component cost. The device’s fine step size can also be used for

Doppler shift corrections.

The SKY72310 has a phase noise floor of –90 dBc/Hz up to

2.1 GHz operation as measured inside the loop bandwidth. This is

permitted by the on-chip low noise dividers and low divide ratios

provided by the device’s high fractionality.

Reference crystals or oscillators up to 50 MHz can be used with

the SKY72310. The crystal frequency is divided down by

independent programmable dividers (1 to 32) for the synthesizer.

The phase detector can operate at a maximum speed of 25 MHz,

which allows better phase noise due to the lower division value.

With a high reference frequency, the loop bandwidths can also be

increased. Larger loop bandwidths improve the settling times and

reduce in-band phase noise. Therefore, typical switching times of

less than 100

µs

can be achieved. The lower in-band phase noise

also permits the use of lower cost Voltage Controlled Oscillators

(VCOs) in customer applications.

The SKY72310 has a frequency power steering circuit that helps

the loop filter to steer the VCO when the frequency is too fast or

too slow, further enhancing acquisition time.

The unit operates with a three-wire, high-speed serial interface. A

combination of large bandwidth, fine resolution, and the three

wire interface allows for direct frequency modulation of the VCO.

This supports any continuous phase, constant envelope

modulation scheme such as Frequency Modulation (FM),

Frequency Shift Keying (FSK), Minimum Shift Keying (MSK), or

Gaussian Minimum Shift Keying (GMSK).

Features

•

Spur-free operation

•

2.1 GHz maximum operating frequency

•

Ultra-fine step size, 100 Hz or less

•

High internal reference frequency enables large loop bandwidth

implementations

•

Very fast switching speed (e.g., below 100

µs)

•

Phase noise to –91 dBc/Hz inside the loop filter bandwidth

@ 1800 MHz

•

Software programmable power-down modes

•

High-speed serial interface up to 100 Mbps

•

Three-wire programming

•

Programmable division ratios on reference frequency

•

Phase detector with programmable gain to provide a

programmable loop bandwidth

•

Frequency power steering further enhances rapid acquisition

time

•

On-chip crystal oscillator

•

Frequency adjust for temperature compensation

•

3 V operation

•

5 V output to loop filter

•

QFN (24-pin, 4 x 4 mm) Pb-free (MSL3, 260

°C

per JEDEC J-

STD-020) package

Skyworks offers lead (Pb)-free, RoHS (Restriction of

Hazardous Substances) compliant packaging.

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

200705E • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • July 30, 2008

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