鈩?/div>
CX72300/CX72301/
CX72302 and CX74038
Conexant鈥檚 synthesizer phase-locked loop (PLL) family, which
comprises the CX72300, CX72301, CX72302 and CX74038 dual
fractional-N synthesizers, sets a benchmark for performance
and functionality. These fractional-N synthesizer ICs resolve
output frequency step sizes below 100 Hz. As precision tuners
in next-generation narrowband and multiband digital radio
products, these chips overcome the traditional trade-off
associated with obtaining ultra-fine frequency resolution
and low-phase noise performance.
Alternative solutions are unable to resolve step sizes below
200 KHz without dividing the crystal reference frequency many
times, a technique that induces unwanted phase noise, degrades
signal integrity and contributes to the cost of radio systems,
potentially forcing designers to use a more expensive voltage
controlled oscillator (VCO). While other solutions sacrifice phase
noise performance to increase resolution, Conexant鈥檚 fractional-N
synthesizer family employs a high internal reference and delta-
sigma (DS) technology to achieve both excellent phase noise
performance and fine frequency resolution in a single chip.
Distinguishing Features
鈥?Industry鈥檚 most comprehensive
dual fractional-N synthesizer family
鈥?Fast settling time (down to 100碌s)
鈥?Ultra-fine step size of 100 Hz or less
鈥?Phase noise as low as -95 dBc/Hz
鈥?Low spurious noise
In addition to offering fine frequency step size and low phase
noise, the Conexant synthesizer PLL family offers fast frequency
settling time, a performance feature required by current and
future wireless network applications such as GPRS and W-CDMA.
This feature enables such applications to send a signal and
quickly reset to send another signal to meet data throughput
requirements.
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