GA1087 Datasheet, PDF (1/10 Pages) TriQuint Semiconductor – 11-Output Configurable Clock Buffer

TRIQUINT
S E M I C O N D U C T O R, I N C .
FBIN GND REFCLK GND F1
11 10 9
8
7
F0 GND
6
5
TEST 12
VDD 13
Q0 ¹⁴
GND ¹⁵
Q1 16
Q2 ¹⁷
VDD ¹⁸
Phase
Detector
VCO
MUX
Divide Logic
÷4, ÷5, or ÷6
Output Buffers
Group B
Group A
4 VDD
3 Q10
2 _Q9
1 GND
28 Q8
27 Q7
26 VDD
19 20
GND Q3
21 22 23
Q4 VDD Q5
24 25
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, f_REF . When one of the Group A outputs
(Q5–Q10) is used as feedback to the PLL, all Group A outputs will be at
f_REF , and all Group B outputs (Q0–Q4) will be at ¹/₂ x f_REF . When one of
the Group B outputs is used as feedback to the PLL, all Group A outputs
will be at 2x f_REF and all Group B outputs will be at f_REF .
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 FBIN, the PLL continuously maintains frequency
and phase synchronization between the reference clock (REFCLK) and
each of the outputs.
TriQuint’s patented output buffer design delivers a very low output-to-
output skew of 150 ps (max). The GA1087’s symmetrical TTL outputs
are capable of sourcing and sinking 30 mA.
GA1087
11-Output
Configurable
Clock Buffer
Features
• Wide frequency range:
24 MHz to 105 MHz
• Output configurations:
five outputs at f_REF
five outputs at f_REF /2 or
six outputs at 2x f_REF
four outputs at f_REF
• Low output-to-output skew:
150 ps (max) within a group
• Near-zero propagation delay:
–350 ps +500 ps (max) or
–350 ps +700 ps (max)
• TTL-compatible with 30 mA
output drive
• 28-pin J-lead
surface-mount package
For additional information and latest specifications, see our website: www.triquint.com
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