Owner's manual

Copyright © Cirrus Logic, Inc. 2008
(All Rights Reserved)
http://www.cirrus.com
Advance Product Information
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
1x, 4x, 128x, and 256x Clock Multiplier with Internal LCO
Features
 Clock Multiplier / Jitter Reduction
– Generates a Low Jitter 6 - 75 MHz Clock
from a Jittery 23 kHz to 30 MHz Clock
Source
 Internal LCO Reference Clock
 128 Hz Loop Filter Bandwidth
 Selectable Multiplication Factors
– 1x, 4x, 128x, and 256x
 Selectable Aux Output Pin
 Minimal Board Space Required
– No External Analog Loop-filter
Components
General Description
The CS2300-03 is an extremely versatile system clock-
ing device that utilizes a programmable phase lock loop.
The CS2300-03 is based on a hybrid analog-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 external noisy synchroniza-
tion clock with frequencies as low as 23 kHz. The
CS2300-03 is a CS2300-OTP device that has been pre-
configured at the factory. There are three hardware con-
figuration pins available for mode and feature selection.
Ordering Information
The CS2300-03 is available in a 10-pin MSOP package
in Commercial (-10°C to +70°C) grade. Customer de-
velopment kits are also available for custom device
prototyping and device evaluation. Please see “Order-
ing Information” on page 2 for complete details.
Pin-Out Diagram
Hardware Controls Settings
1
2
3
4
5
6
7
8
9
10
FILTP
PLL_OUT
GND
VD
FILTN
CLK
/PLL
M1
M0
AUX_OUT
CLK_IN
M1 M0 PLL_OUT
00
1x CLK_IN
01 4x CLK_IN
10 128x CLK_IN
11 256x CLK_IN
CKL/PLL AUX_OUT Source
0
CLK_IN
1 PLL_OUT
6 MHz to 75 MHz
PLL Output
3.3 V
Fractional-N
Frequency Synthesizer
128 Hz BW Digital PLL
& Fractional N Logic
Output to Input
Clock Ratio
N
23 kHz to 30 MHz
Frequency Reference
LCO
M[1:0]
00=1x
01=4x
10=128x
11=256x
Ratio Selection
AUX Output
Source Select
FILTP
FILTN
0.1 µF
CLK_IN
M1
M0
CLK/PLL
VD
0.1 µF 1 µF
GND
PLL_OUT
23 kHz to 75 MHz
AUX Output
PLL_OUT
CLK_IN
AUX_OUT
February '08
PS856A1
CS2300-03