XRT8010 Datasheet, PDF (1/13 Pages) Exar Corporation – 312MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS

XRT8010
312MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS
NOVEMBER 2003
REV. 1.0.2
DESCRIPTION
The XRT8010 is a monolithic analog phase locked
loop that provides a high frequency LVDS clock
output, using a low frequency crystal or reference
clock. It is designed for SONET/SDH and other low
jitter applications.The high performance of the IC
provides a very low jitter LVDS clock output up to 320
MHz, while operating at 3.3 volts. The XRT8010 has
a selectable 8x or 16x internal multiplier for an
external crystal or signal source. The Output Enable
pin provides a true disconnect for the LVDS output.
The very compact (4 x 4 mm) low inductance
package is ideal for high frequency operation.
APPLICATIONS
• Gigabit Ethernet
• SONET/SDH
• SPI-4 Phase 2
• 8x or 16x Clock Multiplier for
s Computer
s Telecommunications Sytems
FEATURES
• 156 or 320 MHz Operating Range
• Low Output Jitter:
s 0.0009 UI_RMS typical @ 155.52 MHz, per
Telcordia GR-253-CORE for OC-3.
• On Chip Crystal Oscillator Circuit
s Optimized for 15 to 40 MHz crystals
s Uses parallel fundamental mode
• Selectable 8x or 16x multiplier
• Selectable ÷1 or ÷2 LVDS output
• LVDS output meets TIA/EIA 644A Specification
(2001)
• 3.3V Low power CMOS: <80 mW typical
• -40°C to +85°C operating temperature
• Extremely small 16-lead QFN package
FIGURE 1. XRT8010 BLOCK DIAGRAM
XTAL1
15-40 MHz
C ry s ta l
XTAL2
AV_DD
AV_DD
+3.3V
R_EXT
10kΩ
OV_DD
12 - 20 pF
12 - 20 pF
XR T8010
O scillator
C ircuit &
Input Buffer
VCO
C alibration Logic
Phase
D etec to r
Charge
Pump
Loop
Filter
Feedback D ivider
÷ 8 or 16
Voltage Reference
&
Bias G enerator
VCO
S e le c ta b le
÷ 1 or ÷ 2
D ivider
OUTP
LVDS Output
OUTN
AGND
(C ry s tal)
AGND
AGND
FS1
FS0
PD
OE
O _GND
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com