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CX72302 Datasheet

  • CX72302

  • CX72302: Spur-Free, 6.1 GHz Dual Fractional-N Frequency Synt...

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DATA SHEET
CX72302: Spur-Free, 6.1 GHz Dual Fractional-N Frequency
Synthesizer
Applications
鈥?/div>
General purpose RF systems
鈥?/div>
2.5G and 3G wireless infrastructures
鈥?/div>
Broadband wireless access
鈥?/div>
Low bit rate wireless telemetry
鈥?/div>
Wireless Local Loop (WLL)
鈥?/div>
Instrumentation
Description
Skyworks CX72302 direct digital modulation 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 400 Hz allows this synthesizer
to be used in very narrowband wireless applications. With proper
temperature sensing or through control channels, the
synthesizer鈥檚 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鈥檚 fine step size can also be used for
Doppler shift corrections.
The CX72302 has a phase noise floor of 鈥?0 dBc/Hz up to
6.1 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鈥檚 high fractionality.
Reference crystals or oscillators up to 50 MHz can be used with
the CX72302. The crystal frequency is divided down by
independent programmable dividers (1 to 32) for the main and
auxiliary synthesizers. The phase detectors 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
碌s
can be
achieved. The lower in-band phase noise also permits the use of
lower cost Voltage Controlled Oscillators (VCOs) in customer
applications.
The CX72302 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 a large bandwidth, fine resolution, and the three-
wire, high-speed serial interface allows for a 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
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Spur-free operation
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6.1 GHz maximum operating frequency
鈥?/div>
1000 MHz maximum auxiliary synthesizer
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Ultra-fine step size, 400 Hz or less
鈥?/div>
High internal reference frequency enables large loop bandwidth
implementations
鈥?/div>
Very fast switching speed (e.g., below 100
碌s)
鈥?/div>
Phase noise to 鈥?0 dBc/Hz inside loop filter bandwidth
@ 6100 MHz
鈥?/div>
Software programmable power-down modes
鈥?/div>
High speed serial interface up to 100 Mbps
鈥?/div>
Three-wire programming
鈥?/div>
Programmable division ratios on reference frequency
鈥?/div>
Phase detectors with programmable gains to provide a
programmable loop bandwidth
鈥?/div>
Frequency power steering further enhances rapid acquisition
time
鈥?/div>
On-chip crystal oscillator
鈥?/div>
Frequency adjust for temperature compensation
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Direct digital modulation
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3 V operation
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5 V output to loop filter
鈥?/div>
28-pin EP-TSSOP 6.4 x 9.7 mm package
Skyworks Solutions, Inc. 鈥?Phone [781] 376-3000 鈥?Fax [781] 376-3100 鈥?sales@skyworksinc.com 鈥?www.skyworksinc.com
101216G 鈥?Skyworks Proprietary and Confidential information 鈥?Products and Product Information are Subject to Change Without Notice 鈥?July 22, 2004
1

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