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LMK00306_16 Datasheet, PDF (1/39 Pages) Texas Instruments – 3-GHz 6-Output Ultra-Low Additive Jitter Differential Clock Buffer/Level Translator | |||
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LMK00306
SNAS578D â FEBRUARY 2012 â REVISED MARCH 2016
LMK00306 3-GHz 6-Output Ultra-Low Additive Jitter
Differential Clock Buffer/Level Translator
1 Features
â¢1 3:1 Input Multiplexer
â Two Universal Inputs Operate up to 3.1 GHz
and Accept LVPECL, LVDS, CML, SSTL,
HSTL, HCSL, or Single-Ended Clocks
â One Crystal Input Accepts a 10 to 40 MHz
Crystal or Single-Ended Clock
⢠Two Banks with 3 Differential Outputs Each
â LVPECL, LVDS, HCSL, or Hi-Z (Selectable
Per Bank)
â LVPECL Additive Jitter with LMK03806 Clock
Source at 156.25 MHz:
â 20 fs RMS (10 kHz to 1 MHz)
â 51 fs RMS (12 kHz to 20 MHz)
⢠High PSRR: -65 / -76 dBc (LVPECL/LVDS) at
156.25 MHz
⢠LVCMOS Output with Synchronous Enable Input
⢠Pin-Controlled Configuration
⢠VCC Core Supply: 3.3 V ± 5%
⢠3 Independent VCCO Output Supplies: 3.3 V/2.5 V
± 5%
⢠Industrial Temperature Range: -40°C to +85°C
⢠36-lead WQFN (6 mm à 6 mm)
2 Applications
⢠Clock Distribution and Level Translation for ADCs,
DACs, Multi-Gigabit Ethernet, XAUI, Fibre
Channel, SATA/SAS, SONET/SDH, CPRI, High-
Frequency Backplanes
⢠Switches, Routers, Line Cards, Timing Cards
⢠Servers, Computing, PCI Express (PCIe 3.0)
⢠Remote Radio Units and Baseband Units
3 Description
The LMK00306 is a 3-GHz, 6-output differential
fanout buffer intended for high-frequency, low-jitter
clock/data distribution and level translation. The input
clock can be selected from two universal inputs or
one crystal input. The selected input clock is
distributed to two banks of 3 differential outputs and
one LVCMOS output. Both differential output banks
can be independently configured as LVPECL, LVDS,
or HCSL drivers, or disabled. The LVCMOS output
has a synchronous enable input for runt-pulse-free
operation when enabled or disabled. The LMK00306
operates from a 3.3 V core supply and 3 independent
3.3 V/2.5 V output supplies.
The LMK00306 provides high performance,
versatility, and power efficiency, making it ideal for
replacing fixed-output buffer devices while increasing
timing margin in the system.
Functional Block Diagram
VCC VCCOA VCCOB VCCOC
2
CLKoutA_TYPE[1:0]
2
CLKin_SEL[1:0]
Universal Inputs
(Differential/
Single-Ended)
CLKin0
CLKin0*
CLKin1
CLKin1*
OSCin
Crystal
OSCout
2
CLKoutB_TYPE[1:0]
REFout_EN
3:1
MUX
SYNC
VCCOA
VCCOB
VCCOC
CLKoutA0
CLKoutA0*
CLKoutA1
CLKoutA1*
CLKoutA2
CLKoutA2*
Bank A
(LVPECL, LVDS,
HCSL, or Hi-Z)
CLKoutB0
CLKoutB0*
CLKoutB1
CLKoutB1*
CLKoutB2
CLKoutB2*
Bank B
(LVPECL, LVDS,
HCSL, or Hi-Z)
REFout (LVCMOS)
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMK00306
WQFN (36)
6.00 mm à 6.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
LVPECL Output Swing (VOD) vs. Frequency
1.0 Vcco=2.5 V, Rterm=91
0.9 Vcco=3.3 V, Rterm=160
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
100
1000
FREQUENCY (MHz)
10000
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
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