CS2000-OTP_09 Datasheet, PDF (1/30 Pages) Cirrus Logic – Fractional-N Clock Synthesizer & Clock Multiplier

CS2000-OTP
Fractional-N Clock Synthesizer & Clock Multiplier
Features
 Delta-Sigma Fractional-N Frequency Synthesis
– Generates a Low Jitter 6 - 75 MHz Clock
from an 8 - 75 MHz Reference Clock
 Clock Multiplier / Jitter Reduction
– Generates a Low Jitter 6 - 75 MHz Clock
from a Jittery 50 Hz to 30 MHz Clock
Source
 Highly Accurate PLL Multiplication Factor
– Maximum Error Less Than 1 PPM in High-
Resolution Mode
 One-Time Programmability
– Configurable Hardware Control Pins
– Configurable Auxiliary Output
 Flexible Sourcing of Reference Clock
– External Oscillator or Clock Source
– Supports Inexpensive Local Crystal
 Minimal Board Space Required
– No External Analog Loop-filter
Components
General Description
The CS2000-OTP is an extremely versatile system
clocking device that utilizes a programmable phase lock
loop. The CS2000-OTP is based on a hybrid analog-
digital PLL architecture comprised of a unique combina-
tion of a Delta-Sigma Fractional-N Frequency
Synthesizer and a Digital PLL. This architecture allows
for both frequency synthesis/clock generation from a
stable reference clock as well as generation of a low-jit-
ter clock relative to an external noisy synchronization
clock with frequencies as low as 50 Hz. The CS2000-
OTP has many configuration options which are set once
prior to runtime. At runtime there are three hardware
configuration pins available for mode and feature
selection.
The CS2000-OTP is available in a 10-pin MSOP pack-
age in Commercial (-10°C to +70°C) grade. Customer
development kits are also available for custom device
prototyping, small production programming, and device
evaluation. Please see “Ordering Information” on
page 29 for complete details.
Hardware Control
Hardware Configuration
3.3 V
Timing Reference
Frequency Reference
PLL Output
Lock Indicator
Auxiliary
Output
8 MHz to 75 MHz
Low-Jitter Timing Reference
50 Hz to 30 MHz
Frequency Reference
http://www.cirrus.com
Fractional-N
Frequency Synthesizer
N
Output to Input
Clock Ratio
Digital PLL & Fractional
N Logic
Output to Input
Clock Ratio
Copyright  Cirrus Logic, Inc. 2009
(All Rights Reserved)
6 to 75 MHz
PLL Output
AUG '09
DS758F1