LMK04832PAPSLASHEM datasheet(87/103 Pages) TI

87 / 103 page

LVCMOS/LVTTL

Clock Source

Input

0.1 µF

CLKINx_P

CLKINx_N

0.1 µF

Figure 9-5. DC-Coupled LVCMOS/LVTTL Reference Clock

9.1.4 OSCin Doubler for Best Phase Noise Performance

PLL2 OSCin input path includes an on-chip Frequency Doubler. To have the best phase noise performance, TI

recommends to maximize the PLL2 phase detector frequency. For example, using 122.88-MHz VCXO, PLL2

phase detector frequency can be increased to 245.76 MHz by setting PLL2_REF_2X_EN. Doubler path is a

high performance path for OSCin clock. For configuration where doubler cannot be used, TI recommends to use

Doubler and PLL2_RDIV = 2. To have deterministic phase relationship between input clock and output clocks,

0-delay modes should be used (nested 0-delay mode for dual loop configuration instead of cascaded 0-delay

mode).

9.1.5 Radiation Environments

9.1.5.1 Total Ionizing Dose

Radiation Hardness assured (RHA) products are those part numbers with a total ionizing dose (TID) level

specified in the ordering information. Testing and qualification of these product is done on a wafer level

according to MIL-STD-883, test method 1019. Wafer level TID data are available with lot shipments.

9.1.5.2 Single Event Effect

One-time single event effect (SEE), including single event latch-up (SEL), single event functional interrupt (SEFI)

and single event upset (SEU), testing was performed according to EIA/JEDEC Standard, EIA/JEDEC57. A test

report is available upon request.

9.2 Typical Application

This design example highlights the available tools used to design loop filters and create a programming map.

DAC

Recovered

“dirty” clock

or clean clock

Mul ple “clean” clocks

at di erent and much

higher frequencies

CLKOUT0 &

CLKOUT2

CLKOUT8

CLKOUT12,

CLKOUT13

FPGA

CLKIN0

VCXO

Backup

Reference

Clock

CLKIN1

OSCOUT

DAC

CLKOUT1 &

CLKOUT3

ADC12DJ3200

QML-SP

LMX2615-SP

PLL+VCO

Serializer/

Deserializer

CLKOUT9

CLKOUT5 &

CLKOUT7

CLKOUT4 &

CLKOUT6

CLKOUT10

CLKOUT11

LMK04832-SEP

Figure 9-6. Typical Application

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LMK04832-SEP

SNAS838 – OCTOBER 2022

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