XRT8020
650 MHZ CLOCK & CRYSTAL MULTIPLIER WITH LVDS OUTPUTS
NOVEMBER 2003
REV. 1.0.2
DESCRIPTION
The XRT8020 is a monolithic analog phase locked
loop that provides a high frequency LVDS clock out-
put, using a low frequency crystal or reference clock.
It is designed for SONET/SDH and other low jitter ap-
plications.The high performance of the IC provides a
very low jitter LVDS clock output up to 650 MHz, while
operating at 3.3 volts. The XRT8020 has a selectable
8x, 16x or 32x internal multiplier for an external crys-
tal or signal source. The Output Enable pin provides
a true disconnect for the LVDS output. The very com-
pact (4 x 4 mm) low inductance package is ideal for
high frequency operation.
APPLICATIONS
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Gigabit Ethernet
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SONET/SDH
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SPI - 4 Phase 2
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8x, 16x or 32x Clock Multiplier for Computer and
Telecommunication Systems
F
IGURE
1. B
LOCK
D
IAGRAM OF THE
XRT8020
15-40 MHz
Crystal
XTAL1
12 - 20 pF
FEATURES
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575 MHz to 675 MHz operating range
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Low Output Jitter: 9ps rms typical at 622 MHz
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On Chip Crystal Oscillator Circuit
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Optimized for 15 to 40 MHz crystals
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Uses parallel fundamental mode crystal
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Selectable 8x, 16x or 32x multiplier
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Selectable
梅
1 or
梅
2 LVDS output
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LVDS output meets TIA/EIA 644A Specification
(2001)
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3.3V 鹵10% Low power CMOS: 80 mW typical
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-40擄C to +85擄C operating temperature
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Extremely small 16-lead QFN package
+3.3V
AV
DD
AV
DD
R
EXT
10k鈩?/div>
OV
DD
XTAL2
12 - 20 pF
XRT8020
Voltage Reference
&
Bias Generator
Oscillator
Circuit &
Input Buffer
VCO
Calibration Logic
Phase
Detector
Charge
Pump
Loop
Filter
VCO
Selectable
梅
1 or
梅
2
Divider
OUTP
LVDS Output
OUTN
Feedback Divider
梅
8, 16 or 32
AGND
(Crystal)
AGND
AGND
FS1
FS0
PD
OE
O
GND
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
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(510) 668-7000
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FAX (510) 668-7017
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XRT8020IL相關(guān)型號(hào)PDF文件下載
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