SLWS230E September   2011  – December 2015 TRF3765

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 4WI Timing: Write Operation
    7. 6.7 Readback 4WI Timing
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Lock Detect
      2. 7.3.2 LO Divider
      3. 7.3.3 Selecting the VCO and VCO Frequency Control
      4. 7.3.4 External VCO
    4. 7.4 Device Functional Modes
      1. 7.4.1 VCO_TEST_MODE
      2. 7.4.2 Readback Mode
      3. 7.4.3 Integer and Fractional Mode Selection
      4. 7.4.4 PLL Architecture
        1. 7.4.4.1 Selecting PLL Divider Values
        2. 7.4.4.2 Setup Example for Integer Mode
        3. 7.4.4.3 Setup Example for Fractional Mode
      5. 7.4.5 Fractional Mode Setup
    5. 7.5 Register Maps
      1. 7.5.1 PLL 4WI Registers
        1. 7.5.1.1 Register 1
          1. 7.5.1.1.1 CAL_CLK_SEL[3..0]
          2. 7.5.1.1.2 ICP[4..0]
        2. 7.5.1.2 Register 2
          1. 7.5.1.2.1 PLL_DIV <1.0>
          2. 7.5.1.2.2 VCOSEL_MODE
        3. 7.5.1.3 Register 3
        4. 7.5.1.4 Register 4
        5. 7.5.1.5 Register 5
        6. 7.5.1.6 Register 6
      2. 7.5.2 Readback from the Internal Register Banks
        1. 7.5.2.1 Register 0 Write
          1. 7.5.2.1.1 Register 0 Read
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedures
        1. 8.2.2.1 Power Supply
        2. 8.2.2.2 Loop Filter
        3. 8.2.2.3 Reference Clock
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

9 Power Supply Recommendations

Power-supply distribution for the TRF3765 is shown in Table 20. Proper isolation and filtering of the supplies are critical for low phase noise operation of the device. Each supply pin should be supplied with local decoupling capacitance and isolated with a ferrite bead.

Table 20. Power-Supply Distribution

PINS SUPPLY BLOCKS
2 VCC_DIG Fractional divider
N-Divider
7 VCC_DIV LO_OUT buffers
LO 1/2/4/8 divider
20 VCC_TK VCO tank
21 VCC_OSC VCO bias
27 VCC_CP Charge pump
28 VCC_PLL 4WI
LD
Prescaler
REF_IN buffer
ISource
RF-Divider
R-Divider