LMK04208NKDR

LMK04208NKDR is TI’s low‑jitter, multi‑output clock generator/distributor. It takes one (or two) reference clocks and provides up to eight synchronized outputs with programmable formats and drive strengths. It includes programmable PLLs for frequency synthesis, jitter cleaning, holdover, and spread‑spectrum clocking to reduce EMI. The device is used to clock FPGAs, SERDES, processors, and networking equipment where tightly coordinated, phase‑aligned clocks are needed. The NKDR suffix denotes packaging/RoHS compliance. For exact specifications (number of outputs, reference options, formats, jitter figures, and modes), consult TI’s datasheet and Clock Architectures/Design guides.

Equivalent devices (8-output jitter-cleaning clock generators) include:
- Silicon Labs: Si5338 and the Si534x multi-output clocks
- SiTime: SiT533x/SiT534x family
- IDT/Renesas: ICS8N series 8-channel clock generators
- TI: LMK04x/LMK02x families (depending on required outputs and jitter)
Note: exact cross-reference depends on input frequency, output types (LVDS/CMOS/LVPECL), voltage, and jitter specs. Check TI cross-reference for substitutes.

LMK04208NKDR features (concise):
- High-performance jitter cleaner and clock distribution buffer
- Up to 8 clock outputs with low jitter and low skew
- Flexible output formats: LVDS/LVPECL/CML/LVCMOS with programmable drive
- Programmable output frequencies via PLL/dividers (including fractional-N)
- Supports single-ended or differential reference input
- I2C-controlled with register-map monitoring and configuration
- Spread-spectrum clocking for EMI reduction
- Output enable/power-down and per-output disable
- Separate clean reference and output power rails for noise isolation
- Wide operating range and low power consumption
- Compact package suitable for dense board layouts
Note: For exact electrical specs (max input freq, output ranges, jitter numbers, voltages, and package details), consult the datasheet.

Pin count: 28 pins (QFN-28 package).
Function: Multi-output low-jitter clock generator/jitter cleaner. It takes a reference clock and generates up to eight independent clock outputs via programmable PLLs/dividers (used to distribute system clocks to processors, SerDes, etc.).

- Manufacturer: Texas Instruments Incorporated (TI).
- What kind of company: An American multinational technology company that designs and manufactures semiconductors and integrated circuits (specializing in analog, mixed-signal, and digital signal processing products; one of the world’s largest semiconductor companies).

LMK04208NKDR is a multi-output, low-jitter clock generator/jitter cleaner. It provides clean reference clocks for distribution with tight skew to multiple devices. Typical applications include:
- FPGA/ASIC/DSP clock distribution
- High-speed SerDes references (PCIe, Ethernet, JESD204, etc.)
- ADC/DAC sampling clocks in data acquisition and communications
- RF/microwave transceivers and test equipment
- Data-center, telecom, and network infrastructure equipment
- Medical imaging and laboratory instrumentation
These use cases leverage its low phase noise, multiple outputs, and flexible clocking options.

LMK04208NKDR comes in a 64‑pin QFN package (5×5 mm), RoHS lead‑free, Tape & Reel.