SNAU259 August   2021

 

  1.   Trademarks
  2. 1 Features
  3. 2 General Description
  4. 3 Signal Path and Control Circuitry
  5. 4 Getting Started
  6. 5 Power Supply Connection
  7. 6 Input Clock Selection
    1. 6.1 Differential Input
    2. 6.2 Configuring Single-Ended Input
  8. 7 Output Clock
  9. 8 EVM Board Schematic
  10. 9 REACH Compliance
  11. 10Bill of Materials

6 Input Clock Selection

The LMK1D1208 can receive either a differential or single-ended clock as clock input. The default board configuration is for a differential signal at both device inputs. The inputs can be applied through the SMAs, J1, J3 or J4, J6. These inputs are AC-coupled to the device. The common-mode voltage is provided by the device on-chip bias generator (VAC_REF) pins.

LMK1D1208: Either of the two input clocks can be selected using the jumper J5. When J5 is connecting IN_SEL to GND, IN0 is selected. When J5 is connecting IN_SEL to VDD, IN1 is selected.