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Texas Instruments LMK1D121x Low Additive Jitter LVDS Clock Buffer

Texas Instruments LMK1D121x Low Additive Jitter LVDS Clock Buffer is specifically designed for driving 50Ω transmission lines. When driving inputs in single-ended mode, apply the appropriate bias voltage to the unused negative input pin. The LMK1D1212 distributes with minimum skew one of two selectable clock inputs (IN0 and IN1) to 12 pairs of differential LVDS clock outputs (OUT0 through OUT11). Similarly, the LMK1D1216 distributes 16 pairs of differential LVDS clock outputs (OUT0 through OUT15). The LMK1D121x family can accept two clock sources into an input multiplexer. The inputs can be LVDS, LVPECL, LP-HCSL, HCSL, CML, or LVCMOS.

The Texas Instruments LMK1D121x IN_SEL pin selects the input, which is routed to the outputs. The part supports a fail-safe input function. The device further incorporates an input hysteresis which prevents random oscillation of the outputs in the absence of an input signal. The device operates in a 1.8V, 2.5V, or 3.3V supply environment and is characterized from –40°C to 105°C (ambient temperature).

Features

  • High-performance LVDS clock buffer family (up to 2GHz)
    • 2:12 differential buffer (LMK1D1212)
    • 2:16 differential buffer (LMK1D1216)
  • 1.71V to 3.465V supply voltage
  • Low additive jitter (< 60fs RMS maximum in 12kHz to 20MHz at 156.25MHz)
    • -164dBc/Hz (typical) very low phase noise floor
  • < 575ps maximum very low propagation delay
  • 20ps maximum output skew
  • High-swing LVDS (boosted mode) (500mV VOD typical when AMP_SEL = 1)
  • Universal inputs accept LVDS, LVPECL, LVCMOS, HCSL, and CML signal levels
  • LVDS reference voltage, VAC_REF, available for capacitive-coupled inputs
  • –40°C to 105°C industrial temperature range
  • Package options
    • LMK1D1212: 6mm × 6mm, 40-pin VQFN
    • LMK1D1216: 7mm × 7mm, 48-pin VQFN

Applications

  • Telecommunications and networking
  • Medical imaging
  • Test and measurement
  • Wireless infrastructure
  • Pro audio, video, and signage

Functional Block Diagram

Block Diagram - Texas Instruments LMK1D121x Low Additive Jitter LVDS Clock Buffer

Texas Instruments LMK1D121x Low Additive Jitter LVDS Clock Buffer