Cirrus Logic CS2100-OTP - Manual

Copyright
 Cirrus Logic, Inc. 2010
(All Rights Reserved) http://www.cirrus.com
Fractional-N Clock Multiplier
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
 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 CS2100-OTP is an extremely versatile system
clocking device that utilizes a programmable phase lock
loop. The CS2100-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 generation of a low-jitter clock relative to an external
noisy synchronization clock with frequencies as low as
50 Hz. The CS2100-OTP has many configuration op-
tions which are set once prior to runtime. At runtime
there are three hardware configuration pins available for
mode and feature selection.
The CS2100-OTP 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 custom device prototyping, small
production programming, and device evaluation.
Please see
“Ordering Information” on page 26 for com-
plete details.
Hardware Configuration
Auxiliary
Output
6 to 75 MHz
PLL Output
Frequency Reference
3.3 V
Hardware
Control
8 MHz to 75 MHz
Low-Jitter Timing
Reference
Fractional-N
Frequency Synthesizer
Digital PLL &
Fractional N Logic
Output to Input
Clock Ratio
N
Timing Reference
PLL Output
Lock Indicator
50 Hz to 30 MHz
Frequency
Reference
MAY '10
DS841F2
CS2100-OTP