Cirrus Logic CS2000-OTP, General Description Manual

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Cirrus Logic Confidential
Copyright

Cirrus Logic, Inc. 2009–2015
(All Rights Reserved)
http://www.cirrus.com
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) 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
“Ordering
Information” on page 29 for complete 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
Output to Input
Clock Ratio
OCT '15
DS758F3
CS2000-OTP