Cirrus Logic CS2000-OTP General Description Manual

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
Hardware Control
8 MHz to 75 MHz
Low-Jitter Timing Reference
50 Hz to 30 MHz
Frequency Reference
http://www.cirrus.com
Hardware Configuration
Output to Input
Clock Ratio
Digital PLL & Fractional
N Logic
Output to Input
Clock Ratio
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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
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) and Automotive-D
(-40°C to +85°C) and Automotive-E (-40°C to +105°C)
grades. Customer development kits are also available
for custom device prototyping, small production pro-
gramming, and device evaluation. Please see
Information" on page 29
3.3 V
Timing Reference
Frequency Reference
PLL Output
Lock Indicator
Fractional-N
Frequency Synthesizer
N
CS2000-OTP
Fractional-N Frequency
"Ordering
for complete details.
Auxiliary
Output
6 to 75 MHz
PLL Output
OCT '15
DS758F3