Cirrus Logic CS2300-CP - Manual

Copyright
 Cirrus Logic, Inc. 2010
(All Rights Reserved) http://www.cirrus.com
Fractional-N Clock Multiplier with Internal LCO
Features
 Clock Multiplier / Jitter Reduction
– Generates a Low Jitter 6 - 75 MHz Clock
from a Jittery or Intermittent 50 Hz to 30
MHz Clock Source
 Internal LC Oscillator for Timing Reference
 Highly Accurate PLL Multiplication Factor
– Maximum Error less than 1 PPM in High-
Resolution Mode
 I²C™ / SPI™ Control Port
 Configurable Auxiliary Output
 Minimal Board Space Required
– No External Analog Loop-filter
Components
General Description
The CS2300-CP is an extremely versatile system
clocking device that utilizes a programmable phase
lock loop. The CS2300-CP is based on a hybrid ana-
log-digital PLL architecture comprised of a unique
combination of a Delta-Sigma Fractional-N Frequency
Synthesizer and a Digital PLL. This architecture allows
for generation of a low-jitter clock relative to an exter-
nal noisy synchronization clock at frequencies as low
as 50 Hz. The CS2300-CP supports both I²C and SPI
for full software control.
The CS2300-CP is available in a 10-pin MSOP pack-
age in Commercial (-10°C to +70°C) and Automotive
(-40°C to +85°C) grades. Customer development kits
are also available for device evaluation. Please see
“Ordering Information” on page 31 for complete details.
I²C / SPI
Auxiliary
Output
6 to 75 MHz
PLL Output
Frequency Reference
3.3 V
I²C/SPI
Software Control
Fractional-N
Frequency Synthesizer
Digital PLL & Fractional
N Logic
Output to Input
Clock Ratio
N
PLL Output
Lock Indicator
50 Hz to 30 MHz
Frequency
Reference
LCO
MAY '10
DS843F2
CS2300-CP