“The ACS1790T represents a key milestone in our mission to provide our customers complete timing solutions. It is our first really low phase noise product and is a great leap forward in performance, perfectly complementing our ToPSync product line and also serving as a versatile stand-alone frequency synthesizer with outstanding performance,” comments David Spencer, Marketing Manager for the Semtech Timing Products.
The ACS1790T can be used as a stand-alone frequency synthesizer or as a companion chip to the ACS9522T ToPSync system synchronization solution, generating a low phase noise local reference clock that is aligned to the system timing recovered by the ACS9522T.
The ACS1790T offers outstanding flexibility with a 24-bit fractional feedback divider as a standalone frequency synthesizer. This generates any output frequency with a resolution of 0.5 parts-per-billion, allowing synthesis of any output frequency within the range of 10 MHz to 200 MHz on the LVPECL output and 2 KHz to 125 MHz on the LVCMOS output.
Packaged in a 4mm x 4mm 24-QFN package, the ACS1790T features a total solution footprint ideal for space-constrained applications. All loop components are on-chip, simplifying the circuit board layout. The combination of a high fractional resolution with a simple serial interface makes the ACS1790T an ideal solution for use in software-controlled loops requiring a translated but disciplined or traceable clock.
ACS1790T key features:
- Very low RMS phase jitter, < 500 fs typical (integrated from 12kHz-20MHz),
- Flexibly generates any frequency within following frequency ranges with 0.5 ppb precision:
– LVPECL output: 10 MHz – 200 MHz,
– LVCMOS output: 2 KHz – 125 MHz.
- Supports 1G/10G Ethernet, SONET/SDH, E1/T1, PCI Express and many other standards,
- Pin-strapped start-up modes for 1G / 10G Ethernet frequencies,
- Simple serial interface for control and configuration,
- 4mm x 4mm 24-QFN package.
Pricing and availability:
The ACS1790T (order code: ACS1790IMLTRT) is available now in production quantities and is priced at $9.00 each in 10,000-piece lots. Semtech offers comprehensive design assistance, including field- and factory-based support.
