PLL702-05 Datasheet, PDF (1/6 Pages) PhaseLink Corporation – Low EMI Peripheral Clock Generator for Notebook

PLL702-05
Low EMI Peripheral Clock Generator for Notebook
FEATURES
• Single Low EMI IC to replace multiple crystals and
oscillators on Notebooks (27MHz, 14.318MHz,
24.576MHz, 25MHz).
• Selectable crystal input: 24.576MHz or 14.318MHz
(accuracy requirement +/- 20ppm)
• Less than 10ppm Frequency Synthesis error, meeting
AC97, IEEE1394, IEEE802 frequency precision
specification.
• 27MHz clock with 2 levels of Selectable Spread
Spectrum modulation +/- 0.5% and +/- 0.75% center.
• 25MHz clock with double drive strength (Ethernet PHY
and MAC).
• 24.576MHz clocks for Audio Codec and IEEE1394.
• Available in 8-Pin SOIC.
Table 1. SPREAD SPECTRUM SELECTION
SST0
SST Modulation only on
27MHz. (pin 7)
1
+/- 0.75 %
0
+/- 0.5 %
M
SST OFF (Default)
Notes: M = Do not connect. 1 = Pulled up. 0 = Pulled down.
BLOCK DIAGRAM
PIN ASSIGNMENT
XIN 1
XOUT 2
VSS 3
24.576MHz/SST0*^T 4
8 _VDD
7
27_14.318MHz/XTAL_SEL*^v
6
VSS
5 25MHzx2
Note: 25MHzx2: double drive strength
*: Bi-directional pin
v_{: Internal pull-down resistor (120kΩ)} T_{: Tri-level input}
POWER GROUPS
• VDD – VSS: XIN, XOUT, analog core, digital part ,
27MHz., 24.576MHz and 25MHz.
Table 2. CRYSTAL SELECTION TABLE
Crystal Input
24.576MHz
14.318MHz
XTAL_SEL
0
1
Pin 7
27MHz
14.318MHz
SST(0)
XIN
XOUT
XTAL
OSC
XTAL_SEL
PLL
SST
27_14.318MHz
24.576MHz
PLL2
25MHz
Note : Only 27MHz output is modulated for low EMI via Spread
Spectrum.
47745 Fremont Blvd., Fremont, California 94538 Tel [phone] Fax [phone] www.phaselink.com Rev 08/12/04 Page 1