CDCE949

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Programmable 4-PLL VCXO clock synthesizer with 2.5-V or 3.3-V LVCMOS outputs

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Product details

Parameters

Function Clock synthesizer Number of outputs 9 Output frequency (Max) (MHz) 230 Core supply voltage (V) 1.8 Output supply voltage (V) 2.5, 3.3 Input type XTAL, LVCMOS Output type LVCMOS Operating temperature range (C) -40 to 85 Features Integrated EEPROM, Multiplier or divider, Spread-spectrum clocking (SSC) Rating Catalog open-in-new Find other Clock generators

Package | Pins | Size

TSSOP (PW) 24 34 mm² 4.4 x 7.8 open-in-new Find other Clock generators

Features

  • Member of Programmable Clock Generator Family
    • CDCEx913: 1 PLLs, 3 Outputs
    • CDCEx925: 2 PLLs, 5 Outputs
    • CDCEx937: 3 PLLs, 7 Outputs
    • CDCEx949: 4 PLLs, 9 Outputs
  • In-System Programmability and EEPROM
    • Serial Programmable Volatile Register
    • Nonvolatile EEPROM to Store Customer Settings
  • Flexible Input Clocking Concept
    • External Crystal: 8 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
    • CDCE949: 3.3 V and 2.5 V
    • CDCEL949: 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 Core 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™)
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Description

The CDCE949 and CDCEL949 are modular PLL-based low cost, high-performance, programmable clock synthesizers, multipliers and dividers. They generate up to 9 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 four independent configurable PLLs.

The CDCEx949 has separate output supply pins, VDDOUT, 1.8 V for the CDCEL949, and 2.5 V to 3.3 V for CDCE949.

The input accepts an external crystal or LVCMOS clock signal. If an external crystal is used, 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, allowing synchronization of the output frequency to an external control signal, that is, a PWM signal.

The deep M/N divider ratio allows the generation of zero-ppm audio or video, networking (WLAN, BlueTooth™, Ethernet, GPS) or Interface (USB, IEEE1394, Memory Stick) clocks from a reference input frequency, such as 27 MHz.

All PLLs support SSC (Spread-Spectrum Clocking). SSC can be Center-Spread or Down-Spread clocking. This is a common technique to reduce electro-magnetic interference (EMI).

Based on the PLL frequency and the divider settings, the internal loop-filter components are automatically adjusted to achieve high stability, and to optimize the jitter-transfer characteristics of each PLL.

The device supports non-volatile EEPROM programming for easy customization of the device to the application. It is preset to a factory-default configuration. It can be reprogrammed to a different application configuration before PCB assembly, or reprogrammed by in-system programming. All device settings are programmable through the SDA and SCL bus, a 2-wire serial interface.

Three programmable control inputs, S0, S1 and S2, can be used to control various aspects of operation including frequency selection, changing the SSC parameters to lower EMI, PLL bypass, power down, and choosing between low level or 3-state for the output-disable function.

The CDCEx949 operates in a 1.8-V environment. It operates within a temperature range of –40°C to 85°C.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 15
Type Title Date
* Datasheet CDCE(L)913: Flexible Low Power LVCMOS Clock Generator With SSC Support for EMI Reduction datasheet (Rev. F) Oct. 27, 2016
Technical articles The five benefits of multiple-personality clocking devices May 17, 2016
Technical articles How to select an optimal clocking solution for your FPGA-based design Dec. 09, 2015
Technical articles Clocking sampled systems to minimize jitter Jul. 31, 2014
Technical articles Timing is Everything: How to optimize clock distribution in PCIe applications Mar. 28, 2014
Application note VCXO Application Guideline for CDCE(L)9xx Family (Rev. A) Apr. 23, 2012
User guide CDCE(L)9XX & CDCEx06 Programming Evaluation Module Manual (Rev. A) Nov. 22, 2010
User guide CDCE(L)9xx Performance Evaluation Module (Rev. A) Jul. 07, 2010
Application note General I2C / EEPROM usage for the CDCE(L)9xx family Jan. 26, 2010
Application note Troubleshooting I2C Bus Protocol Oct. 19, 2009
Application note Usage of I2C for CDCE(L)949, CDCE(L)937, CDCE(L)925, CDCE(L)913 Sep. 23, 2009
User guide CDCE(L)9XX & CDCEx06 Programming Evaluation Module Manual Dec. 09, 2008
Application note Generating Low Phase-Noise Clocks for Audio Data Converters from Low Frequency Mar. 31, 2008
Application note Practical consideration on choosing a crystal for CDCE(L)9xx family Mar. 24, 2008
Application note Clocking Recommendations for DM6446 Digital Video EVM with Sngle PLL (Rev. A) Aug. 08, 2007

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
149
Description

The CDCE949Perf-Evaluation Module will help to verify the functionality and performance of CDCE949 with the options of crystal and 1.8 V LVCMOS inputs. The outputs can be connected to the Oscilloscope directly with SMA cables. The below information/items can be included The EVM use’s (...)

Features
  • Easy-to-use evaluation module for fast prototyping and application evaluation.
  • Supporting the entire clock family.
  • Easy and fast device programming through TI Pro-ClockT software.
  • Evaluation of multiple crystals and reference clocks due to flexible input structure.
  • EVM completely USB powered in factory (...)
EVALUATION BOARD Download
document-generic User guide
99
Description

The clock generator CDCE(L)949 family has integrated EEPROM that allows the default frequency settings to be saved upon start up. CDCEL9XXPROGEVM is a programming board that allows a fast programming of prototyping samples or small production quantities. It applies to all 8 devices in the family (...)

Software development

DRIVER OR LIBRARY Download
SCAC131.ZIP (77 KB)
GUI FOR EVALUATION MODULE (EVM) Download
SCAC073F.ZIP (88940 KB)
SOFTWARE PROGRAMMING TOOL Download
ClockPro™ Programming Software
CLOCKPRO TI's ClockPro software allows users to program/configure the following devices in a friendly GUI interface:
  • CDCE949
  • CDCE937
  • CDCE925
  • CDCE913
  • CDCE906
  • CDCE706
  • CDCEL949
  • CDCEL937
  • CDCEL925
  • CDCEL913

It is intended to be used with the evaluation modules of the above devices.

Features
  • Easy and fast device programming through EEPROM, I2C
  • Based on Labview
SUPPORT SOFTWARE Download
SCAC119E.ZIP (4405 KB)

Design tools & simulation

SIMULATION MODEL Download
SCAC094B.ZIP (42 KB) - IBIS Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

REFERENCE DESIGNS Download
Ultrasound smart probe power supply reference design
TIDA-010057 — Significant technological advancements and high degree of integration in Medical imaging, especially hand-held ultrasound smart probes, are pushing engineers to come up with highly-efficient, noise immune power solutions in a small size. This reference design documents end to end power and data (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 24 View options

Ordering & quality

Information included:
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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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