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PLL
PLL

PL671-01 Datasheet Preview

PL671-01 Datasheet

Programmable Spread Spectrum Clock

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PL671-01 pdf
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P(Preliminary) L671-01
PicoEMITM Programmable Spread Spectrum Clock
FEATURES
Advanced programmable PLL with Spread Spectrum
Crystal or Reference Clock input
o Fundamental crystal: 10MHz to 40MHz
o Reference input: 1MHz to 200MHz
Accepts ≥0.1V reference signal input voltage
Output frequency range: up to 166MHz @ 2.5V or
up to 200Mhz @ 3.3V operation
Up to 3 programmable outputs
Programmable Spread Spectrum Modulation
Magnitude:
o Center Spread: ±0.125% to ±2.0% in ±0.125%
steps
o Down Spread: -0.25% to -4.0% in 0.25% steps
Spread Spectrum On/Off selection
Programmable output drive (4mA, 8mA, 16mA)
Low Cycle to Cycle jitter.
Single 2.5V or 3.3V ± 10% power supply
Available in 8-pin SOP, MSOP and 6-pin SOT
GREEN/RoHS compliant packaging
DESCRIPTION
The PL671-01 is an advanced programmable Spread
Spectrum clock generator (PSSCG), and a member
of PhaseLink’s PicoPLL™ Programmable Clock
family.
The PL671-01 offers up to three 200MHz outputs,
and allows for programming the modulation type
(Center or Down Spread) as well as 16 modulation
magnitudes (±0.125% to ±2.0% or -0.25% to -4.0%).
In addition, the CSEL[0:1] pins can be used to toggle
the device thru 4 pre-programmed configurations.
The option of being able to turn ‘ON/OFF’ the
Spread Spectrum modulation allows for completing a
design with PL671-01 and having the assurance of
turning ‘ON’ the EMI modulation, if EMI becomes an
issue. The PL671-01’s frequency modulation
greatly reduces the fundamental and harmonic
frequencies’ peak magnitude, therefore reducing the
system level Electro Magnetic Interference (EMI), by
as much as 20dB
PIN CONFIGURATION
BLOCK DIAGRAM
Note: ^ Denotes 60KPull-up resistor
VCO REF
OUT VCO
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 2/9/2007 Page 1



PLL
PLL

PL671-01 Datasheet Preview

PL671-01 Datasheet

Programmable Spread Spectrum Clock

No Preview Available !

PL671-01 pdf
www.DataSheet4U.com
P(Preliminary) L671-01
PicoEMITM Programmable Spread Spectrum Clock
PACKAGE PIN ASSIGNMENT
Name
XIN/FIN
PDB, CLK1
(Programmable)
(M)SOP-8L
Pin #
1
2
SOT23-6L
Pin #
3
1
Type
I
I/O
Description
Crystal or Reference input pin
This pin can be programmed to function as PDB (input) or CLK1
(output).
Power Down (PDB) input. This pin has an internal 60KΩ pull up
resistor and turns off the oscillator and the output when pulled to
logic “0”.
PDB Logic
Osc PLL
Output
0 Off Off Hi Z (Default)
1 Normal Operation (Default)
Clock1 (CLK1) output. This optional clock can be set to FREF,
FREF/2 or FOUT (Programmable PLL output).
Selector pin used to toggle between two pre-programmed
CSEL1 3 - I configurations (When used in conjunction with CSEL0 there are
four possible pre-defined configurations to choose from).
GND 4 2 P GND connection
CLK0
5
CSEL0, CLK2
6
VDD 7
6 O Programmable Clock Output with spread spectrum.
This pin can be programmed to function as CSEL0 (input) or
CLK2 (output).
CSEL0 input. Selector pin used to toggle between two pre-
-
I/O
programmed configurations (When used in conjunction with
CSEL1 there are four possible pre-defined configurations to
choose from).
CLK2 output. This optional clock can be set to FREF, CLK0,
CLK0/2 or CLK0/4.
5 P VDD connection (2.25~3.63V)
XOUT
8 4 O Crystal output pin. Do Not Connect when using FIN.
KEY PROGRAMMING PARAMETERS
CLK[ 0:2 ]
Output Frequency
SST Modulation Magnitude
(Spread Percentage)
FOUT = FREF * M / (R * P)
where M =11 bit
R = 9 bit
P = 6 bit
CLK0= FREF, FREF/2 or FVCO/P*
CLK1= FREF, FREF/2 or FVCO/P*
CLK2= FREF, CLK0, CLK0/2
or CLK0/4
16 programmable modulation
magnitudes to choose from:
Center Spread: ±0.125% to
±2.0% in ±0.125% steps
Down Spread: -0.25% to -4.0%
in 0.25% steps
SST On/Off Control.
* ‘P’ is a 6-bit Odd/Even divider.
Programmable
Input/Output
Output Drive
Strength
Programmable I/O’s include:
PDB – input
CSEL[0:1] Configuration
Selection - input
SST On/Off control – input
CLK[0:2] - output
Three optional
drive strengths
to choose
from:
Low: 4mA
Std: 8mA
(default)
High: 16mA
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 2/9/2007 Page 2


Part Number PL671-01
Description Programmable Spread Spectrum Clock
Maker PLL
Total Page 9 Pages
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