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LMK04208NKDR

Name: LMK04208NKDR
Rating: 4.7 (12 reviews)

IC CLOCK DUAL PLL 64WQFN

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資料表 LMK04208NKDR DataSheet
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規格

Series	PLLatinum™
Part Status	Active
Base Product Number	LMK04208
DigiKey Programmable	Not Verified
PLL	Yes
Input	LVCMOS, LVDS, LVPECL
Output	LVCMOS, LVDS, LVPECL
Number of Circuits	1
Ratio - Input:Output	2:7
Differential - Input:Output	Yes/Yes
Frequency - Max	1.536GHz
Divider/Multiplier	Yes/No
Voltage - Supply	3.15V ~ 3.45V
Operating Temperature	-45°C ~ 85°C
Mounting Type	Surface Mount
Package	64-WFQFN Exposed Pad
Supplier Device Package	64-WQFN (9x9)
Packaging	Tape & Reel (TR)

概述

Description

LMK04208NKDR is a TI clock conditioner and generator. It takes a reference clock and cleans/distributes it to multiple, configurable outputs with low jitter, suitable for FPGAs, SerDes, memory interfaces, and other high-speed digital systems. Key features typically include a PLL-based jitter cleaner, frequency synthesis, and optional spread-spectrum modulation. Output formats are configurable (LVDS/LVPECL/CMOS) with adjustable swing to match different load requirements. The device is programmable via I2C or SPI, with status monitoring and fault reporting. The NKDR suffix denotes a specific package/revision and RoHS-compliant packaging. Common use cases include board-level clock distribution for high-speed interconnects, providing a single, low-jitter reference to multiple subsystems while reducing BOM complexity. For exact specifications (input frequency range, output counts/formats, jitter budgets, power supplies, and programming details), consult the LMK04208 data sheet and TI reference designs.

Features

LMK04208NKDR features (concise):
- 8-output jitter-attenuating clock distribution device for distributing clean clock signals.
- Flexible input/reference options with a primary clock reference (crystal/clock) and optional secondary/reference for jitter cleaning.
- Internal PLL with programmable multiply/divide to generate required output frequencies.
- Per-output configurability: selectable output formats (LVDS, LVPECL, CML, HCSL, CMOS) and adjustable drive strength; individual output enable/disable.
- Spread-spectrum clock generation to reduce EMI.
- I2C/SMBus-compatible control interface for programmatic setup, monitoring (lock status, power, etc.), and dynamic changes.
- Low-noise, low-power operation over a wide temperature range.
- Compact, space-saving package suitable for dense board layouts and applications like high-speed data, FPGA/ASIC clocking, and SERDES systems.

Package

LMK04208NKDR is in a 32‑pin QFN package (5×5 mm), RoHS lead‑free.

Pinout

56 pins. It’s a TI LMK04208 high-precision, low-jitter clock generator/distributor (jitter cleaner) with 8 outputs, used to generate and distribute multiple low-jitter clock signals from a reference source.

Manufacturer

- Manufacturer: Texas Instruments Incorporated (TI).
- Company type: American multinational semiconductor company that designs and manufactures analog, mixed-signal, and embedded processing integrated circuits for a wide range of industries.

Application

LMK04208NKDR is a multi-output, low-jitter clock generator/driver. Applications:
- Low-jitter clock generation and multi-output distribution for high-speed SERDES, FPGA, and ADC/DAC systems
- Telecom/datacom infrastructure (base stations, switches/routers, optical transceivers)
- High-speed interfaces (PCIe, Ethernet) and RF transceivers
- Test and measurement equipment requiring synchronized, clean reference clocks

Equivalent

Equivalent devices (8‑output jitter-clean/clock-distribution products):
- Analog Devices: AD9528 (and related AD9523/AD9524 family)
- Silicon Labs: Si5338, Si5326, Si5328
Note: choose based on input references, output formats (LVCMOS/LVDS/LVPECL), and jitter/phase specs to match LMK04208NKDR.