SY89610L Datasheet, PDF (1/17 Pages) Micrel Semiconductor – 77.75MHz to 694MHz Jitter Attenuator and Low Phase Noise Frequency Synthesizer

SY89610L
77.75MHz to 694MHz Jitter Attenuator and
Low Phase Noise Frequency Synthesizer
General Description
The SY89610L is a 3.3V, fully differential jitter attenuator
and frequency synthesizer that accepts a noise clock
between 19.44MHz and 694MHz, depending on I/O
frequency selection. The output provides an ultra-low
jitter clock frequency between 77.75MHz and 694MHz
covering SONET/SDH, Gigabit Ethernet, Fibre Channel,
SAS, SATA, and many other communication standards.
The output jitter of the SY89610L is typically 1ps_RMS. It
has a 1kHz to 10kHz programmable loop bandwidth to
accommodate different jitter attenuation applications
and PLL requirements. The auto-tune circuit enables
precision frequency calibration.
The differential input includes Micrel’s unique, 3-pin
input termination architecture that interfaces to LVPECL,
LVDS or CML differential signals, (AC- or DC-coupled)
as small as 100mV without any level-shifting or
termination resistor networks in the signal path. For AC-
coupled input interface applications, an on-board output
reference voltage (V_REF-AC) is provided to bias the V_T pin.
The outputs are compatible with 400mV typical swing
into 50Ω loads, with rise/fall times guaranteed to be less
than 250ps.
The SY89610L operates at 3.3V ±10% supply and the
output can accommodate 1.8V to 3.3V operation with
the dedicated output supply. The part is guaranteed to
operate over the full industrial temperature range
(–40°C to +85°C). The SY89610L is part of Micrel’s
Precision Edge^® product line.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Precision Edge is a registered trademark of Micrel, Inc.
Features
Precision Edge^®
ƒ Accepts high jitter input clock signal and attenuates
it to provide Ultra-Low Jitter and Phase Noise clock
signal at the output
ƒ Output Frequency Range: 77.75MHz – 694MHz
ƒ Input Frequency Range: 19.44MHz – 694MHz
ƒ Phase Noise and Jitter performance:
– <2ps_RMS Output Jitter Gen (12kHz-20MHz)
– Low Phase Noise: -80dBc/Hz at 1kHz offset
ƒ CML compatible output signal
ƒ 3-pin input accepts an AC- or DC-coupled
differential input (LVDS, LVPECL, and CML)
ƒ Unique, Auto-Tune circuitry enables precision
frequency calibration
ƒ Internal source termination to minimize round-trip
reflections
ƒ Programmable Loop Bandwidth: 1kHz-10kHz
ƒ Output Enable/disable function
ƒ Only one external component needed for LC VCO
(a filter capacitor)
ƒ Includes Loss of Lock (LOL) output pin
ƒ Includes Auto-tune Circuit for precision frequency
calibration
ƒ 1.8V ±5% to 3.3V ±10% output power supply
ƒ 3.3V ±10% power supply operation
ƒ Industrial temperature range: –40°C to +85°C
ƒ Available in 32-pin (5mm x 5mm) QFN package
Applications
Covers telecom/datacom/storage standards:
ƒ SONET/SDH
ƒ GbE and 10GbE LAN PHY (w/FEC)
ƒ 1/2/4/8G Fibre Channel
ƒ High-end routers and switches
ƒ Telecom transmission equipment
ƒ High speed optical modules
ƒ Long haul transport
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
July 2008
M9999-071008-D
[e-mail] or [phone]