1 Features

? SMD #5962-23202

– Total ionizing dose 100 krad (ELDRS-free)

– Single event latch-up (SEL) immune up to 87

MeV - cm2 /mg

– Single event functional interrupt (SEFI) immune

up to 87 MeV - cm2 /mg

? Clock buffer for 300-MHz to 15-GHz frequency

? Ultra-Low Noise

– Noise floor of –159 dBc/Hz at 6-GHz output

– 36-fs additive jitter (100 Hz to fCLK) at 6-GHz

output

– 5-fs additive jitter (100 Hz - 100 MHz)

? 4 high-frequency clocks with corresponding

SYSREF outputs

– Shared divide by 1 (Buffer), 2, 3, 4, 5, 6, 7, and

8

– Shared programmable multiplier x2, x3, and x4

? Support pin mode options to configure the device

without SPI

? LOGICLK output with corresponding SYSREF

output

– On separate divide bank

– 1, 2, 4 pre-divider

– 1 (bypass), 2, …, 1023 post divider

? 8 programmable output power levels

? Synchronized SYSREF clock outputs

– 508 delay step adjustments of less than 2.5 ps

each at 12.8 GHz

– Generator and repeater modes

– Windowing feature for SYSREFREQ pins to

optimize timing

? SYNC feature to all divides and multiple devices

? 2.5-V operating voltage

? –55oC to +125oC operating temperature

2 Applications

? Radar imaging payload

? Communications payloads

? Command and data handling

? Data converter clocking

? Clock distribution/multiplication/division

3 Description

The LMX1906-SP is an buffer, divider and multiplier

that features high frequency, ultra-low jitter, and

SYSREF outputs. This device combined with an ultralow

noise reference clock source is an exemplary

solution for clocking data converters, especially when

sampling above 3 GHz. Each of the 4 high frequency

clock outputs and additional LOGICLK output is

paired with a SYSREF output clock signal. The

SYSREF signal for JESD interfaces can either be

internally generated or passed in as an input and

re-clocked to the device clocks. This device can

distribute the mutlichannel, low skew, ultra-low noise

local oscillator signals to multiple mixers by disabling

the SYSREF outputs.