GA1088

TriQuint's GA1088 is a configurable clock buffer which generates 11 outputs, operating over a wide range of frequencies - from 18 MHz to 105 MHz. The outputs of GA1088 are available at either 1x and 2x or at 1x and  1/₂ x the reference clock frequency, f_REF  . When one of the Group A outputs (Q0 Q2) is used as feedback to the PLL, all Group A outputs will be at f_REF  , and all Group B (Q3Q6) and Group C (Q7Q10) outputs will be at 2x f_REF  . When one of the Group B outputs is used as feedback to the PLL, all Group A outputs will be at  1/₂ x f_REF and all Group B and Group C outputs will be at f_REF .

A very stable internal Phase-Locked Loop (PLL) of GA1088 provides low-jitter operation. This completely self-contained PLL requires no external capacitors or resistors. The PLL's voltage-controlled oscillator (VCO) has  frequency range from 280 MHz to 420 MHz. By feeding back one of the output clocks to FBIN, the PLL continuously maintains frequency and phase synchronization between the reference clock (REFCLK) and each of the outputs. The Shift Select pins select the phase shift (2t, t, 0, or +t) for Group C outputs (Q7Q10) with respect to REFCLK. The phase shift increment (t) is equivalent to the VCO's period (1/f_VCO).

TriQuint's patented output buffer design delivers a very low output-to- output skew of 150 ps (max). The GA1088's symmetrical TTL outputs are capable of sourcing and sinking 30 mA.