TI claims industry's most flexible clocking IC for wired communications systems

August 28, 2012 // By Paul Buckley
Texas Instruments Incorporated has introduced what the company claims is the industry’s most flexible and highly integrated clock jitter cleaner/multiplier for use in wired communications and test and measurement applications.

The LMK04906 offers three redundant inputs with a holdover feature and seven programmable outputs. This flexibility allows designers to eliminate external components, such as oscillators and clock buffers, significantly reducing their bill of materials (BOM) cost and board space. In addition, with industry-leading RMS jitter of 100 fs and noise floor of -160 dBc/Hz, the LMK040906 can improve signal integrity in high-speed data communications systems.
The LMK04906 offers maximum flexibility by enabling integration of seven high-performance, programmable outputs offered in LVDS, LVPECL and LVCMOS simplifies timing design.

High integration eliminates the need for the oscillators and clock buffers typically used to implement a low-jitter clock tree. Features such as holdover, input switching, analog/digital delay, and odd/even dividers increase clocking functionality while reducing cost.

The LMK04906 is also claiming the  industry’s lowest jitter and phase noise: 100 fs RMS jitter from 12 kHz to 20 MHz with a noise floor of -160 dBc/Hz at 156.25 MHz output frequency enables greater signal integrity in high-speed data communication links such as 10GbE, FC, FCoE, and SAS/SATA.

In addition, TI introduced the CDCM6208 clock synthesizer and jitter cleaner, which offers similar integration and flexibility for wireless base stations, pico and femto cells, line cards and handheld medical equipment. The CDCM6208 provides eight low-jitter clock outputs, pin-control mode, flexible output voltages, and a fractional divider.

The LMK04906 and CDCM6208 can be combined with the following devices to create a high-speed data link: TMS320C66x KeyStone Multicore DSP, LMK00301 3-GHz differential fanout buffer, LMK03806 clock generator with 14 outputs, DS100DF410 10GbE quad-channel retimer, LP3878-ADJ 800-mA low-noise LDO regulator, and TLK10002 dual-channel 10-Gbps multi-rate transceiver.

TI’s clock design tool supports the LMK04906, aiding designers with part selection, loop filter design and simulation of timing device solutions. The LMK04906 evaluation module (EVM) and IBIS model are available today. Two CDCM6208 EVMs, EVM control GUI, and IBIS model are also available today.

Availability and Pricing

The LMK04906 is available