herunterladen
CDCE(L)9xx
Clock
Ethernet
PHY
USB
Controller
WiFi
FPGA
25
MHz
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
CDCE925
,
CDCEL925
SCAS847H –JULY 2007–REVISED AUGUST 2016
CDCEx925 Programmable 2-PLL VCXO Clock Synthesizer
With 1.8-V, 2.5-V, 3.3-V LVCMOS Outputs
1
1 Features
1
• Member of Programmable Clock Generator
Family
– CDCEx913: 1-PLL, 3 Outputs
– CDCEx925: 2-PLL, 5 Outputs
– CDCEx925: 3-PLL, 7 Outputs
– CDCEx949: 4-PLL, 9 Outputs
• In-System Programmability and EEPROM
– Serial Programmable Volatile Register
– Nonvolatile EEPROM to Store Customer
Settings
• Flexible Input Clocking Concept
– External Crystal: 8 MHz to 32 MHz
– On-Chip VCXO: Pull Range ±150 ppm
– Single-Ended LVCMOS Up to 160 MHz
• Free Selectable Output Frequency Up to
230 MHz
• Low-Noise PLL Core
– PLL Loop Filter Components Integrated
– Low Period Jitter (Typical 60 ps)
• Separate Output Supply Pins
– CDCE925: 3.3 V and 2.5 V
– CDCEL925: 1.8 V
• Flexible Clock Driver
– Three User-Definable Control Inputs
[S0/S1/S2], for Example, SSC Selection,
Frequency Switching, Output Enable, or Power
Down
– Generates Highly Accurate Clocks for Video,
Audio, USB, IEEE1394, RFID, Bluetooth™,
WLAN, Ethernet™, and GPS
– Generates Common Clock Frequencies Used
With TI-DaVinci™, OMAP™, DSPs
– Programmable SSC Modulation
– Enables 0-PPM Clock Generation
• 1.8-V Device Power Supply
• Wide Temperature Range: –40°C to 85° C
• Packaged in TSSOP
• Development and Programming Kit for Easy PLL
Design and Programming (TI Pro-Clock™)
2 Applications
D-TVs, STBs, IP-STBs, DVD Players, DVD
Recorders, and Printers
3 Description
The CDCE925 and CDCEL925 are modular PLL-
based low-cost, high-performance, programmable
clock synthesizers, multipliers, and dividers. They
generate up to five output clocks from a single input
frequency. Each output can be programmed in-
system for any clock frequency up to 230 MHz, using
up to two independent configurable PLLs.
The CDCEx925 has a separate output supply pin,
V
DDOUT
, which is 1.8 V for CDCEL925 and 2.5 V to
3.3 V for CDCE925.
The input accepts an external crystal or LVCMOS
clock signal. In case of a crystal input, an on-chip
load capacitor is adequate for most applications. The
value of the load capacitor is programmable from 0 to
20 pF. Additionally, an on-chip VCXO is selectable
which allows synchronization of the output frequency
to an external control signal, that is, PWM signal.
Device Information
(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
CDCEx925 TSSOP (16) 5.00 mm x 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application Schematic
Verzeichnis
- ・ Konfiguration des Pinbelegungsdiagramms on Seite 4 Seite 5
- ・ Abmessungen des Paketumrisses on Seite 32 Seite 34 Seite 35
- ・ Markierungsinformationen on Seite 32 Seite 33
- ・ Blockdiagramm on Seite 1 Seite 13
- ・ Typisches Anwendungsschaltbild on Seite 1 Seite 24 Seite 25 Seite 26 Seite 27
- ・ Technische Daten on Seite 5
- ・ Anwendungsbereich on Seite 1 Seite 38
- ・ Elektrische Spezifikation on Seite 6 Seite 7 Seite 8
