鈥?/div>
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.
PIN ASSIGNMENT
XIN
XOUT
VSS
24.576MHz/SST0*
T
1
2
3
4
8
7
6
5
VDD
27_14.318MHz/XTAL_SEL*
v
VSS
25MHzx2
Note:
25MHzx2: double drive strength
v
: Internal pull-down resistor (120k鈩?
POWER GROUPS
鈥?/div>
VDD 鈥?VSS: XIN, XOUT, analog core, digital part ,
27MHz., 24.576MHz and 25MHz.
PLL702-05
T
:
*: Bi-directional pin
Tri-level input
Table 1. SPREAD SPECTRUM SELECTION
SST0
1
0
M
SST Modulation only on
27MHz. (pin 7)
+/- 0.75 %
+/- 0.5 %
SST OFF (Default)
Table 2. CRYSTAL SELECTION TABLE
Crystal Input
24.576MHz
14.318MHz
XTAL_SEL
0
1
Pin 7
27MHz
14.318MHz
Notes: M = Do not connect. 1 = Pulled up. 0 = Pulled down.
BLOCK DIAGRAM
XTAL_SEL
SST(0)
XIN
XOUT
XTAL
OSC
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 (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 08/12/04 Page 1
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