GA1088 Datasheet | TriQuint Semiconductor

Features - Wide frequency range: 18 MHz to 105 MHz - Output configurations: three outputs at 1/2 f REF three outputs at f REF four outputs at f REF with adjustable phase or two outputs at f REF four outputs at 2x f REF four outputs at 2x f REF with adjustable phase SYSTEM TIMING PRODUCTS GND 15 Q1 Q2 16 17 MUX Divide Logic ÷4, ÷6, or ÷8 Output Buffers Group B Phase Select 1 GND 28 Q8 Q7 Group A Group C VDD 18 26 VDD Q3 Q4 Q5 Q6 Tri Quint’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 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 (Q3- Q6) and Group C (Q7- Q10) 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) provides low-jitter operation. This pletely self-contained PLL requires no external capacitors or resistors. The PLL’s voltage-controlled oscillator (VCO) has a 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 (Q7- Q10) with respect to REFCLK. The phase shift increment (t) is equivalent to the VCO’s period (1/f VCO). Tri Quint’s patented output buffer design delivers a very low output-tooutput skew of 150 ps (max). The GA1088’s symmetrical TTL outputs are capable of sourcing and sinking 30 m A. - Selectable Phase Shift: - 2t, - t, 0, and +t (t = 1/f VCO) - Low output-to-output skew: 150 ps (max) within a group -...