Description
7
5. FUNCTIONAL DESCRIPTION 9
5.1 DEVICE IDENTIFICATION 9 5.2 PIN-CONTROLLED AUTOMATIC CONFIGURATION AT RESET 9
5.2.1 ZL30250
External EEPROM or No EEPROM 9 5.2.2 ZL30251
Internal EEPROM 10
5.3 LOCAL OSCILLATOR OR CRYSTAL 10
5.3.1 External Oscillator 10 5.3.2 External Crystal and On-Chip Driver Circuit 11 5.3.3 Clock Doubler 12 5.3.4 Ring Oscillator (for System Start-Up) 12
5.4 INPUT SIGNAL FORMAT CONFIGURATION 12 5.5 NUMERICALLY CONTROLLED OSCILLATOR / SPREAD SPECTRUM B
Features
- Four Input Clocks.
- One crystal/CMOS input.
- Two differential/CMOS inputs.
- One single-ended/CMOS input.
- Any input frequency from 9.72MHz to 1250MHz (9.72MHz to 300MHz for CMOS).
- Clock selection by pin or register control.
- Low-Jitter Fractional-N APLL and 3 Outputs.
- Any output frequency from.