CS2300-03 Datasheet, PDF (1/3 Pages) Cirrus Logic – 1x, 4x, 128x, and 256x Clock Multiplier with Internal LCO

CS2300-03
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
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
VD
1
GND
2
PLL_OUT
3
AUX_OUT
4
CLK_IN
5
10
M0
9
M1
8
CLK/PLL
7
FILTN
6
FILTP
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.
Hardware Controls Settings
M1
M0
0
0
0
1
1
0
1
1
PLL_OUT
1x CLK_IN
4x CLK_IN
128x CLK_IN
256x CLK_IN
CKL/PLL
0
1
AUX_OUT Source
CLK_IN
PLL_OUT
0.1 µF
Ratio Selection
23 kHz to 30 MHz
Frequency Reference
FILTP
FILTN
LCO
M[1:0]
M1
00=1x
M0
01=4x
10=128x
11=256x
Fractional-N
Frequency Synthesizer
N
CLK_IN
Output to Input
Clock Ratio
128 Hz BW Digital PLL
& Fractional N Logic
PLL_OUT
CLK_IN
VD
GND
0.1 µF 1 µF
3.3 V
PLL_OUT
CLK/PLL
6 MHz to 75 MHz
PLL Output
AUX Output
Source Select
AUX_OUT
23 kHz to 75 MHz
AUX Output
Advance Product Information
http://www.cirrus.com
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
Copyright © Cirrus Logic, Inc. 2008
(All Rights Reserved)
February '08
PS856A1