CDC5806_15 Datasheet, PDF (1/13 Pages) Texas Instruments – THREE PLLs BASED CLOCK GENERATOR

CDC5806
www.ti.com
SCAS760A – MARCH 2004 – REVISED JULY 2004
THREE PLLs BASED CLOCK GENERATOR FOR DIGITAL TV APPLICATIONS
FEATURES
• High Performance Clock Generator
• Clock Input Compatible With LVCMOS/LVTTL
• Requires a 54-MHz Input Clock to Generate
Multiple Output Frequencies
• Low Jitter for Clock Distribution
• Generates the Following Clocks:
– VIDCLK 74.175824 MHz/54 MHz
(Buffered)
– AUDCLK 16.9344 MHz/12.288 MHz
– CPUCLK 64 MHz
– ASICCLK 32 MHz
– USBCLK 48 MHz
– MCCLK 38.4 MHz/19.2 MHz/12 MHz
• Operates From Single 3.3-V Supply
• Low Peak-to-Peak Period Jitter (150 ps
Max)
• PLLs Are Powered Down, if No Valid REF_IN
Clock (< 5 MHz) is Detected or the
V_DD is Below 2 V
• PLL Loop Filter Components Integrated
• Packaged in TSSOP (PW) 20-Pin Package
• Industrial Temperature Range -40°C to
85°C Applications
APPLICATIONS
• Digital Television With a Memory Card
Interface
DESCRIPTION
The CDC5806 is a clock generator which synthesizes
video clocks, audio clocks, CPU clock, ASIC clock,
USB clock, and a memory card clock from a 54-MHz
system clock.
Three phase-locked loops (PLLs) are used to
generate the different frequencies from the system
clock. On-chip loop filters and internal feedback
eliminate the need for external components.
Since the CDC5806 is based on PLL circuitry, it
requires a stabilization time to achieve phase-lock of
the PLLs. The PLL stabilization time begins after the
reference clock input has a stable phase and
frequency.
The device operates from a single 3.3-V supply
voltage. The CDC5806 device is characterized for
operation from -40°C to 85°C.
PW PACKAGE
(TOP VIEW)
VIDSEL
1
REF_IN
2
PLL1VDD
3
VIDCLK
4
PLL1VSS
5
PLL2VDD
6
AUDCLK
7
PLL2VSS
8
AUDSEL
9
MCSEL
10
20
ASICCLK
19
PLL3VDD
18
PLL3VSS
17
CPUCLK
16
PLL3VDD
15
PLL3VSS
14
USBCLK
13
PLL3VDD
12
PLL3VSS
11
MCCLK
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004, Texas Instruments Incorporated