Texas Instruments LMK0482x Synthesizer & Jitter Cleaner
Texas Instruments LMK0482x Ultra-Low-Noise Synthesizer and Jitter Cleaner high-performance with JEDEC JESD204B support. The 14 clock outputs from PLL2 can be configured to drive seven JESD204B converters or other logic devices using the device and SYSREF clocks. SYSREF can be provided using both DC and AC coupling. Not limited to JESD204B applications, each of the 14 outputs can be individually configured as high-performance outputs for traditional clocking systems. Features include the ability to trade-off between power or performance, dual VCOs, dynamic digital delay, holdover, and glitchless analog delay. These features make the LMK0482x family ideal for providing flexible high-performance clocking trees. The LMK0482x-EP devices feature gold bond wires, a temperature range of -55°C to +105°C, and include an SnPb lead finish.
Features
- JEDEC JESD204B support
- Ultra-low RMS jitter
- 88fs RMS jitter (12kHz to 20MHz)
- 91fs RMS jitter (100Hz to 20MHz)
- -162.5dBc/Hz noise floor at 245.76MHz
- Up to 14 differential device clocks from PLL2
- Up to 7 SYSREF clocks
- 3.1GHz Maximum clock output frequency
- LVPECL, LVDS, HSDS, and LCPECL
- Programmable outputs from PLL2
- Up to 1 buffered VCXO/crystal output from PLL1, LVPECL, LVDS, 2xLVCMOS programmable
- Dual loop PLLatinum™ PLL architecture
- PLL1
- Up to 3 redundant input clocks
- Automatic and manual switch-over modes
- Hitless switching and LOS
- Integrated low-noise crystal oscillator circuit
- Holdover mode when input clocks are lost
- Up to 3 redundant input clocks
- PLL2
- Normalized (1Hz) PLL noise floor of -227dBc/Hz
- Phase detector rate up to 155MHz
- OSCin frequency-doubler
- Two integrated low-noise VCOs
- 50% duty cycle output divides, 1 to 32 (even and odd)
- Precision digital delay, dynamically adjustable
- 25ps step analog delay
- Multi-mode: dual PLL, single PLL, and clock distribution
- Industrial -40°C to +85°C temperature range
- Supports +105°C PCB temperature (measured at thermal pad)
- 3.15V to 3.45V operation
- 64-pin QFN package (9.0mm × 9.0mm × 0.8mm)
Applications
- Wireless infrastructure
- Data converter clocking
- Networking, SONET/SDH, and DSLAM
- Medical
- Video
- Military/aerospace
- Test and measurement
Videos
Simplified Schematic
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