ZHCS927G May 2012 – January 2018 CDCM6208
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
-
6 Specifications
- 6.1 Absolute Maximum Ratings
- 6.2 ESD Ratings
- 6.3 Recommended Operating Conditions
- 6.4 Thermal Information, Airflow = 0 LFM
- 6.5 Thermal Information, Airflow = 150 LFM
- 6.6 Thermal Information, Airflow = 250 LFM
- 6.7 Thermal Information, Airflow = 500 LFM
- 6.8 Single-Ended Input Characteristics (SI_MODE[1:0], SDI/SDA/PIN1, SCL/PIN4, SDO/ADD0/PIN2, SCS/ADD1/PIN3, STATUS1/PIN0, RESETN/PWR, PDN, SYNCN, REF_SEL)
- 6.9 Single-Ended Input Characteristics (PRI_REF, SEC_REF)
- 6.10 Differential Input Characteristics (PRI_REF, SEC_REF)
- 6.11 Crystal Input Characteristics (SEC_REF)
- 6.12 Single-Ended Output Characteristics (STATUS1, STATUS0, SDO, SDA)
- 6.13 PLL Characteristics
- 6.14 LVCMOS Output Characteristics
- 6.15 LVPECL (High-Swing CML) Output Characteristics
- 6.16 CML Output Characteristics
- 6.17 LVDS (Low-Power CML) Output Characteristics
- 6.18 HCSL Output Characteristics
- 6.19 Output Skew and Sync to Output Propagation Delay Characteristics
- 6.20 Device Individual Block Current Consumption
- 6.21 Worst Case Current Consumption
- 6.22 Timing Requirements, I2C Timing
- 6.23 Typical Characteristics
- 7 Parameter Measurement Information
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Typical Device Jitter
- 8.3.2 Universal Input Buffer (PRI_REF, SEC_REF)
- 8.3.3 VCO Calibration
- 8.3.4 Reference Divider (R)
- 8.3.5 Input Divider (M)
- 8.3.6 Feedback Divider (N)
- 8.3.7 Prescaler Dividers (PS_A, PS_B)
- 8.3.8 Phase Frequency Detector (PFD)
- 8.3.9 Charge Pump (CP)
- 8.3.10 Fractional Output Divider Jitter Performance
- 8.3.11 Device Block-Level Description
- 8.3.12 Device Configuration Control
- 8.3.13 Configuring the RESETN Pin
- 8.3.14 Preventing False Output Frequencies in SPI/I2C Mode at Start-Up
- 8.3.15 Input MUX and Smart Input MUX
- 8.4 Device Functional Modes
- 8.5 Programming
- 8.6 Register Maps
-
9 Application and Implementation
- 9.1 Application Information
- 9.2
Typical Applications
- 9.2.1 Design Requirements
- 9.2.2
Detailed Design Procedures
- 9.2.2.1 Jitter Considerations in SERDES Systems
- 9.2.2.2 Jitter Considerations in ADC and DAC Systems
- 9.2.2.3 Configuring the PLL
- 9.2.2.4 Programmable Loop Filter
- 9.2.2.5 Loop filter Component Selection
- 9.2.2.6 Device Output Signaling
- 9.2.2.7 Integer Output Divider (IO)
- 9.2.2.8 Fractional Output Divider (FOD)
- 9.2.2.9 Output Synchronization
- 9.2.2.10 Output Mux on Y4 and Y5
- 9.2.2.11 Staggered CLK Output Power Up for Power Sequencing of a DSP
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
10.1.3 Slow Power-Up Supply Ramp
No particular power supply sequence is required for the CDCM6208. However, it is necessary to ensure that device calibration occurs AFTER the DVDD supply as well as the VDD_PLL1, VDD_PLL2, VDD_PRI, and VDD_SEC supply are all operational, and the voltage on each supply is higher than 1.45. This is best realized by delaying the PDN low-to-high transition. The PDN input incorporates a 50-kΩ resistor to DVDD. Assuming the DVDD supply ramp has a fixed time relationship to the slowest of all PLL and input power supplies, a capacitor from PDN to GND can delay the PDN input signal sufficiently to toggle PDN low-to-high AFTER all other supplies are stable. However, if the DVDD supply ramps much sooner than the PLL or input supplies, additional means are necessary to prevent PDN from toggling too early. A premature toggling of PDN would possibly result in failed PLL calibration, which can only be corrected by re-calibrating the PLL by either toggling PDN or RESET high-low-high.
Figure 59. PDN Delay When Using Slow Ramping Power Supplies (Supply Ramp > 50 ms)