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CDCE421 Status: NRND

Fully Integrated Wide Range Low-Jitter Crystal Oscillator Clock Generator


      
         
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Alert Icon   NRND: This product is not recommended for new designs. However, the device, tool, or software continues to be in production to support existing customers. TI does not recommend using this part in a new design. TI encourages designers to consider alternative products for new designs.

Replaced By:

  • CDCE421A The device has the SAME FUNCTIONALITY and PINOUT as the compared device but is NOT an exact equivalent. 

Product Information

Features

  • Single 3.3-V Supply
  • High-Performance Clock Generator Incorporating Crystal-Oscillator Circuitry With Integrated Frequency Synthesizer
  • Low-Output Jitter: As Low as 380 fs (rms Integrated Between 10 kHz—20 MHz)
  • Low Phase Noise at High Frequency: at 708 MHz it is less than -109 dBc/Hz at 10-kHz and -146 dBc/Hz at 10-MHz Offset from the Carrier
  • Supports Crystal Frequencies Between 27.35 MHz to 38.33 MHz
  • Output Frequency Ranges from 10.9 MHz up to 766.7 MHz and from 875.2 MHz up to 1175 MHz
  • Low-Voltage Differential Signaling (LVDS) Output, 100-Ω Differential Off-Chip Termination, 10.9-MHz to 400-MHz Frequency Range
  • Differential Low-Voltage Positive Emitter-Coupled Logic (LVPECL) Output, 10.9-MHz to 1.175-GHz Frequency Range
  • Two Fully Integrated Voltage-Controlled Oscillators (VCOs) Support Wide Output Frequency Range
  • Fully Integrated Programmable Loop Filter
  • Typical Power Consumption: 274 mW in LVDS Mode and 250 mW in LVPECL Mode
  • Chip-Enable Control Pin
  • Simple Serial Interface Allows Programming After Manufacturing
  • Integrated On-Chip Nonvolatile Memory (EEPROM) to Store Settings Without the Need to Apply High Voltage to the Device
  • QFN24 Package
  • ESD Protection Exceeds 2 kV HBM
  • Industrial Temperature Range: -40°C to +85°C
  • APPLICATIONS
    • Low-Cost, High-Frequency Crystal Oscillator

All other trademarks are the property of their respective owners

Description

The CDCE421 is a high-performance, low-phase-noise clock generator. It has two fully integrated, low-noise, LC-based voltage controlled oscillators (VCOs) that operate in the 1.750-GHz to 2.350-GHz frequency range. It has an integrated crystal oscillator that operates in conjunction with an external AT-cut crystal to produce a stable frequency reference for the PLL-based frequency synthesizer.

The output frequency (fout) is proportional to the frequency of the input crystal (fxtal). The prescaler divider, feedback divider, output divider, and VCO selection are what set (fout) with respect to (fxtal). For a desired frequency (fout), look in Table 1 and find the corresponding settings in the same row. Use Equation 1 to calculate the exact crystal oscillator frequency needed for the desired output.

fxtal = (OuputDivider/FeedbackDivider) x fout

Output divider(1) = 1, 2, 4, 8, 16, or 32

Feedback divider(2) = 12, 16, 20, or 32

(1)Output divider and feedback divider should be from the same row in Table 1.

(2)Feedback divider is set automatically with respect to the prescaler setting in Table 1.

A high-level block diagram of the CDCE421 is shown in Figure 1.

The CDCE421 supports one differential LVDS clock output or one differential LVPECL output.

All device settings are programmable through a Texas Instruments proprietary simple serial interface.

The device operates in a 3.3-V supply environment and is characterized for operation from -40°C to +85°C.

The CDCE421 is available in a QFN-24 package.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsSamples
CDCE421RGERNRND 7.00 | 1kuVQFN (RGE) | 24 View 3000 | LARGE T&R Download CAD Format for this SymbolNot Available
CDCE421RGERG4NRND 7.00 | 1kuVQFN (RGE) | 24 View 3000 | LARGE T&R Download CAD Format for this SymbolNot Available
CDCE421RGETNRND 7.70 | 1kuVQFN (RGE) | 24 View 250 | SMALL T&R Download CAD Format for this SymbolNot Available
CDCE421RGETG4NRND 7.70 | 1kuVQFN (RGE) | 24 View 250 | SMALL T&R Download CAD Format for this SymbolNot Available
CDCE421YNRND 7.10 | 1kuDIESALE (Y) | 0  182 Not Available
CDCE421YSNRND0 to 707.00 | 1kuWAFERSALE (YS) | 0  30635 Not Available

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

Reported Distributor Inventory as of 11:54 AM GMT, 06 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 WeeksCDCE421RGER
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksCDCE421RGERG4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksCDCE421RGET
WorldwideDigiKey 8
Mouser Electronics 156
TI Lead Time*: 20 WeeksCDCE421RGETG4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksCDCE421Y
None Reported
View Distributors
TI Lead Time*: 20 WeeksCDCE421YS
None Reported
View Distributors
View all Distributors  

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

 Product ContentDPPM / MTBF / FIT Rate
DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
CDCE421RGER  Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
CDCE421RGERG4  Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
CDCE421RGET  Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
CDCE421RGETG4  Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
CDCE421Y  Green (RoHS & no Sb/Br) Call TI N/A for Pkg TypeViewView
CDCE421YS  Green (RoHS & no Sb/Br) Call TI N/A for Pkg TypeViewView

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Most useful technical documents for CDCE421 Help

Datasheet

Application Notes

User Guides

Tools & Software

NamePart # Company Tool / Software Type
CDCE421A Evalution ModuleCDCE421AEVMTexas InstrumentsDevelopment Boards/EVMs
CDCL6010EVM Evaluation ModuleCDCL6010EVMTexas InstrumentsDevelopment Boards/EVMs

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