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PLL

PL671-00 Datasheet Preview

PL671-00 Datasheet

Programmable Spread Spectrum Clock

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PicoEMITM Programmable Spread Spectrum Clock
FEATURES
Advanced programmable Spread Spectrum clock
generator with 16 modulation steps to choose from
Programmable SST 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
Input Frequency Range:
o Fundamental Crystal: 10MHz to 40MHz
Output Frequency Range:
o 1MHz to 200MHz @ 3.3V operation
o 1MHz to 166MHz @ 2.5V operation
Programmable Output Drive (4mA, 8mA, 16mA)
Low Cycle to Cycle jitter, 100pS
Single 2.5V to 3.3V, ± 10% power supply
Available in Die form
DESCRIPTION
The PL671-00 is an advanced programmable Spread
Spectrum clock generator (PSSCG), and a member of
PhaseLink’s PicoPLL Programmable Clock family.
The PL671-00 clock outputs can be programmed up to
200MHz (3.3V) or 166MHz (2.5V), and has 16 modulation
magnitudes (±0.125 to ±2.0% or -0.25 to -4.0%) to choose
from for use in Center or Down Spread modulation
applications. In addition, 2 configuration pins can be
programmed to allow cycling the device through 4 pre-
programmed states*. The option of being able to turn
‘ON/OFF’ the Spread Spectrum modulation allows for
completing a design with PL671-00 and having the assurance
of turning ‘ON’ the EMI modulation if EMI becomes an issue*.
The PL671-00’s spread spectrum modulation greatly
reduces the fundamental and harmonic frequencies’
peak magnitude, reducing the system level
electromagnetic radiation by as much as 20dB.
*Note: Requires 6-pad package
PAD CONFIGURATION
0.80mm
XIN XOUT
OE^, PDB^,
CLK1
CSEL1^
VDD
CSEL0^, CLK2
GND
CLK0
Note: ^ denotes internal pull up resistor
BLOCK DIAGRAM
DIE SPECIFICATION
Parameter
Chip size
Chip thickness
PAD size
Chip base
XIN
XOUT
Xtal
FREF
Osc
Modulation Magnitude*
PDB
CLK[0:2]
CSEL[0:1]
SST On/Off
* Optional Pre-defined
Modulation Magnitude Control
R-Counter
9-bits
M-Counter
11-bits
P-Counter
6-bits
Odd/Even
/1, /2
÷8 Phase
Detector
÷8
Charge
Pump
FVCO = FREF * (M/R)
FOUT = FVCO / P
Loop
Filter
Value
1.40mm x 0.80mm
150 to 250µm
90µm x 90 µm
GND level
SST
Modulation
VCO
CLK1/PDB
CLK0
Programmable Function
/1, /2, /4
CLK2/CSEL0
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 12/22/08 Page 1




PLL

PL671-00 Datasheet Preview

PL671-00 Datasheet

Programmable Spread Spectrum Clock

No Preview Available !

PicoEMITM Programmable Spread Spectrum Clock
PAD ASSIGNMENT AND DESCRIPTION
Name
Pad Assignment*
Type
Pad # X (µm) Y (µm)
Description
XIN 1
OE, PDB,
CLK1
2
124 1286 I Crystal input pad.
This pin can be programmed to function as OE (input), PDB (input)
or CLK1 (output).
Output Enable (OE) input. Enables and disables the clock output
buffer. Internal pull up resistor.
Power Down (PDB) input. Turns off the oscillator, PLL and the
output when pulled to logic “0”. Internal pull up resistor.
87 930 I/O
Pin State
OE
PDB
0 Disable CLK Power Down Mode
1 (default)
Normal mode
Normal mode
CSEL1
3
Clock1 (CLK1) output. This optional clock can be set to FREF,
FREF/2 or FOUT (Programmable PLL output).
Optional programming of CSEL0 & CSEL1 input pins allow
87 628 I switching between ‘4’ pre-defined configurations. Internal pull up
resistor.
GND 4 87 275 P GND connection
CLK0
5 714 380 O Programmable Clock Output
This pin can be programmed to function as CSEL0 (input) or CLK2
(output).
CSEL0,
CLK2
6
714 677
CSEL0 input. Optional programming of CSEL0 & CSEL1 input
I pins allow switching between ‘4’ pre-defined configurations.
Internal pull up resistor.
CLK2 output. This optional clock can be set to FREF, CLK0,
CLK0/2 or CLK0/4.
VDD
7
714 916
P VDD connection
XOUT 8 677 1286 O Crystal output pad. See Crystal Specifications on page 6.
* Note: The X/Y coordinates indicate pad centers referenced from the lower left corner of the die.
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 12/22/08 Page 2


Part Number PL671-00
Description Programmable Spread Spectrum Clock
Maker PLL
Total Page 6 Pages
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