12-channel precision timing sources for complex networks

May 21, 2016 // By Graham Prophet
An addition to IDT’s FemtoClock family is designed to provide frequency flexibility for complex timing networks; the 8T49N1012 FemtoClock NG synthesizer provides 12 configurable clock outputs, providing a single-chip solution for an entire clock tree

This synthesizer gives the system designer options to pre-configure the settings of the device or program them in the system, or a combination of both. With eight fractional and two integer output dividers, the synthesizer is a single-chip solution that aids design engineers in resolving complex timing requirements while achieving key performance parameters. Use it in enterprise-class systems in networking and communications, as well as printing, computing, instrumentation, audio, video, backplane and USB applications. The flexibility and cost effectiveness of the device alone, IDT says, suits it for virtually any general timing requirement.

The 8T49N1012 is programmable through an I²C interface and also supports master capability, allowing the register configuration to be read from an external EEPROM. This capability is beneficial in providing a means for system quick recovery upon resolution of a general system fault. In addition, programmable skew control on all eight fractional outputs allows for in-circuit trace delay adjustments. IDT’s Timing Commander software tool enables fast reconfiguration of the device, which aids engineers when dealing with overall design iterations.

The part offers 12 differential or 2 x 12 in-phase LVCMOS clocks; fractional output dividers provide up to eight completely independent frequencies with better than 1ppb accuracy; two integer output dividers provide an additional four outputs. Phase jitter performance is less than 500 fsec RMS phase jitter (12 kHz to 20 MHz), and output frequencies are from 8 kHz up to 1 GHz differential, 250 MHz LVCMOS. Flexible input options include a 10 to 40 MHz fundamental mode crystal, or reference input from 10 to 600 MHz. Skew control on all fractional output dividers allows for adjustments in steps as small as 16 psec; there is indication of loss of lock and loss of signal; and there are bypass clock paths and reference output for system tests.

In a 10 x 10 mm 72-VFQFN package, pricing is $4.60 (10,000).

IDT; www.idt.com