11-Output Configurable Clock Buffer
T
R
I
Q
U
I
N
T
S E M I C O N D U C T O R, I N C .
GA1087
FBIN GND REFCLK GND
11 10 9 8
F1
7
F0
6
GND
5
TES...
Description
T
R
I
Q
U
I
N
T
S E M I C O N D U C T O R, I N C .
GA1087
FBIN GND REFCLK GND
11 10 9 8
F1
7
F0
6
GND
5
TEST 12 VDD 13
Phase Detector VCO
4 VDD 3 2
Q10 Q9
11-Output Configurable Clock Buffer
Features
Wide frequency range: 24 MHz to 105 MHz Output configurations: five outputs at fREF five outputs at fREF /2 or six outputs at 2x fREF four outputs at fREF Low output-to-output skew: 150 ps (max) within a group
SYSTEM TIMING PRODUCTS
Q0
14
GND 15 Q1 Q2
16 17
MUX Divide Logic ÷4, ÷5, or ÷6 Output Buffers Group B Group A
1 GND 28 27
Q8 Q7
VDD 18
26 VDD
19
20
21
22
23
24
25
GND
Q3
Q4
VDD
Q5
Q6
GND
TriQuint’s GA1087 is a configurable clock buffer which generates 11 outputs, operating over a wide range of frequencies — from 24 MHz to 105 MHz. The outputs are available at either 1x and 2x or at 1x and 1/2 x the reference clock frequency, fREF . When one of the Group A outputs (Q5–Q10) is used as feedback to the PLL, all Group A outputs will be at fREF , and all Group B outputs (Q0–Q4) will be at 1/2 x fREF . When one of the Group B outputs is used as feedback to the PLL, all Group A outputs will be at 2x fREF and all Group B outputs will be at fREF . A very stable internal Phase-Locked Loop (PLL) provides low-jitter operation. Completely self-contained, this 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...
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