FS6245(2000) Ver la hoja de datos (PDF) - AMI Semiconductor
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FS6245 Datasheet PDF : 8 Pages
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AMERICAN MICROSYSTEMS, INC.
FS6245
Dual PLL VCXO Clock Generator IC
December 2000
1.0 Features
• On-chip tunable voltage-controlled crystal oscillator
circuitry (VCXO) allows precise system frequency
tuning (pull range typically 300ppm)
• VCXO tuning range: 0-3V
• Uses inexpensive fundamental-mode crystals
• Two integrated phase-locked loops (PLL) multiply
VCXO frequency to the higher system frequencies
needed
• 5V core supply voltage (contact factory for 3.3V)
• 3.3V / 5V output supply voltage
• Small circuit board footprint (20-pin SOIC)
• Custom frequency selections available - contact your
local AMI Sales Representative for more information
2.0 Description
The FS6245 is a monolithic CMOS clock generator IC
designed to minimize cost and component count in digital
video/audio systems.
At the core of the FS6245 is circuitry that implements a
voltage-controlled crystal oscillator when an external
resonator is attached. The VCXO allows device frequen-
cies to be precisely adjusted for use in systems that have
frequency matching requirements, such as digital satellite
receivers.
Two high-resolution phase-locked loops generate the
output clock frequencies (CLKA, CLKB, and CLKC).
These frequencies are phase-locked and frequency-
locked to the VCXO frequency. Synthesis error of the
PLLs is +/-0 ppm unless otherwise noted.
Figure 1: Pin Configuration
n/c 1
XOUT 2
XIN 3
VDD 4
XTUNE 5
n/c 6
VSS 7
OE 8
CLKA 9
n/c 10
20 n/c
19 n/c
18 CLKC
17 n/c
16 n/c
15 VDDO
14 VSS
13 CLKB
12 n/c
11 n/c
Table 1: Crystal / Output Frequencies
DEVICE
FS6245-01
fXIN (MHz) CLKA (MHz) CLKB (MHz) CLKC (MHz)
13.500
11.0592
18.432
27.000
NOTE: Contact AMI for custom PLL frequencies
Figure 2: Block Diagram
XIN
XOUT
XTUNE
VCXO
PLL
Divider
Array
PLL
CLKA
CLKB
CLKC
FS6245
This document contains information on a preproduction product. Specifications and information herein are subject to change without notice.
ISO9001
12.12.00
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