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CDCE62005 Datasheet(PDF) 36 Page - Texas Instruments |
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CDCE62005 Datasheet(HTML) 36 Page - Texas Instruments |
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36 / 80 page  VCO CAL Sleep ActiveMode PowerON Reset PowerDown Sync Calibration Hold DelayFinished CAL_Enabled Sleep = ON Sleep = OFF CAL Done PowerDown=ON Sync=ON Sync=OFF Manual Recalibration=ON Device OFF Power Applied CDCE62005 SCAS862C – NOVEMBER 2008 – REVISED FEBRUARY 2010 www.ti.com Device Control Figure 22 provides a conceptual explanation of the CDCE62005 Device operation. Table 15 defines how the device behaves in each of the operational states. Figure 22. CDCE62005 Device State Control Diagram Table 15. CDCE62005 Device State Definitions Status State Device Behavior Entered Via Exited Via Output Output SPI Port PLL Divider Buffer After device power supply reaches Power applied to the device or upon Power On Reset and EEPROM loading OFF Disabled Disabled OFF approximately 2.35 V, the contents exit from Power Down State via the delays are finished OR the Power_Down Power-On of EEPROM are copied into the Power_Down pin set HIGH. pin is set LOW. Reset Device Registers, thereby initializing the device hardware. The device waits until either Delay process in the Power-On Reset The device waits until either ON Enabled Disabled OFF ENCAL_MODE (Device Register 6 State is finished or Sleep Mode (Sleep ENCAL_MODE (Device Register 6 bit 27) bit 27) is low (Start up calibration bit is in Register 8 bit 7) is turned OFF is low (Start up calibration enabled) or Calibration enabled) or both ENCAL_MODE is while in the Sleep State. Power Down both ENCAL_MODE is high (Manual Hold high (Manual Calibration Enabled) must be OFF to enter the Calibration Calibration Enabled) AND ENCAL (Device AND ENCAL (Device Register 6 bit Hold State. Register 6 bit 22) transitions from a low to 22) transitions from a low to a high a high signaling the device signaling the device. The voltage controlled oscillator is Calibration Hold: CAL Enabled Calibration Process in completed ON Enabled Disabled OFF calibrated based on the PLL settings becomes true when either and the incoming reference clock. ENCAL_MODE (Device Register 6 bit After the VCO has been calibrated, 27) is low or both ENCAL_MODE is the device enters Active Mode high AND ENCAL (Device Register 6 automatically. bit 22) transitions from a low to a high. VCO CAL Active Mode: A Manual Recalibration is requested. This is initiated by setting ENCAL_MODE to HIGH (Manual Calibration Enabled) AND initiating a calibration sequence by applying a LOW to HIGH transition on ENCAL. Normal Operation CAL Done (VCO calibration process Sync, Power Down, Sleep, or Manual ON Enabled Disabled Disabled Active Mode finished) or Sync = OFF (from Sync Recalibration activated. or or State). Enabled Enabled 36 Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s) :CDCE62005 |
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