LMK1D1212RHAT

Clock Buffers, Drivers Overview

The LMK1D1212RHAT is a low additive jitter LVDS clock buffer manufactured by Texas Instruments. It distributes one of two selectable clock inputs to 12 pairs of differential LVDS outputs. The device supports input frequencies up to 2 GHz and operates with a supply voltage ranging from 1.71 V to 3.465 V. Key electrical specifications include a maximum propagation delay of 575 ps, an output skew of 20 ps, and a typical phase noise floor of -164 dBc/Hz. It accepts universal input signal levels including LVDS, LVPECL, LVCMOS, HCSL, and CML. The component is housed in a 6-mm × 6-mm, 40-pin VQFN (RHA) package and is characterized for industrial operating temperatures between –40°C and 105°C.

Clock Buffers, Drivers Feature Summary

• Low additive jitter performance with less than 60 fs RMS maximum at 156.25 MHz
• Universal input compatibility supporting LVDS, LVPECL, LP-HCSL, HCSL, CML, and LVCMOS signals
• Configurable output amplitude via AMP_SEL pin, offering standard 350 mV or boosted 500 mV swing modes
• Fail-safe input design with hysteresis to prevent random oscillation when no input signal is present

Clock Buffers, Drivers Applications

• Telecommunications and networking systems
• Medical imaging equipment
• Test and measurement instrumentation
• Wireless infrastructure components
• Professional audio, video, and signage displays

Clock Buffers, Drivers Procurement Notes

Verify the specific ordering suffix RHAT corresponds to the required tape-and-reel packaging configuration. Confirm that the 40-pin VQFN footprint matches the target PCB layout dimensions. Ensure the design accommodates the thermal requirements associated with the junction-to-ambient resistance specified in the datasheet for the intended operating environment.

Clock Buffers, Drivers Selection Notes

Select the LMK1D1212RHAT when a 2:12 fan-out ratio is required with low skew distribution. Consider the boosted output mode if the downstream receivers require higher voltage swings for improved noise immunity. Verify that the input source signal levels are compatible with the device's universal input range. Ensure the power supply rails fall within the 1.71 V to 3.465 V operational window.

Clock Buffers, Drivers Part Context

The LMK1D1212RHAT belongs to the LMK1D121x family of low additive jitter LVDS buffers. This family includes variants such as the LMK1D1216, which provides 16 outputs in a larger package. The RHA suffix specifically denotes the 40-pin VQFN package format. These devices are designed to replace older buffering solutions requiring lower jitter and greater flexibility in input signal types.

Clock Buffers, Drivers Replacement Considerations

LMK1D1216RGZ offers 16 outputs in a 48-pin VQFN package. LMK1D1208P provides 8 outputs in the same 40-pin VQFN package. LMK1D2106LRHAT is a dual-bank variant with different control features.