ACS1790T Datasheet (Semtech) - PLL Frequency Synthesizer

ACS1790T, PLL Frequency Synthesizer

6 DEVICE OPERATION 7 THE VCO PLL BLOCK 7 THE OUTPUT DIVIDER BLOCK8 THE OUTPUT STAGE 8 THE CONTROL BLOCK 8 Reset9 USING THE ACS1790T 9 HARDWARE DEVICE CONFIGURATION9 Input clock frequency selection 9 Default output frequency selection 10 REGISTER-BASED DEVICE CONFIGURATION 10 I2C slave address select

SCL SDA A0 FBCLK A1 VDDD2 ADVANCED COMMUNICATIONS PRODUCT GROUP Introduction The ACS1790T is a high-performance, low phase noise, programmable frequency synthesizer with ultra-fine dynamic output frequency control.

It can be used as a companion to a compatible ToPSync™ device to generate outputs locked to an external reference source or standalone for standard frequency generation for common applications.

The circuit includes an integrated VCO, loop filter, phase-and-frequency detector and outp

ACS1790T Features

* Optimised for Synchronous Ethernet, SONET and SDH operation

* Meets RMS jitter requirements of Gigabit Ethernet, 10 Gigabit Ethernet and OC-48 / STM16

* Default options for 25 MHz & 125 MHz or 25 MHz & 156.25 MHz outputs at reset

* High frequency LVPECL output: 10 MHz

* 200