Overview
The LMK00308SQE/NOPB, produced by Texas Instruments, is a 3-GHz, 8-output differential fanout buffer designed for high-frequency, low-jitter clock/data distribution and level translation. This component is highly versatile and power-efficient, making it an ideal replacement for fixed-output buffer devices while enhancing the timing margin in the system. It features a 3:1 input multiplexer, allowing selection from two universal inputs or one crystal input, and distributes the selected clock to two banks of differential outputs and one LVCMOS output.
Key Specifications
| Specification | Value |
|---|---|
| Package | 40-lead WQFN (6 mm × 6 mm) |
| Operating Temperature Range | -40°C to +85°C |
| Input Frequency Range (Universal Inputs) | Up to 3.1 GHz |
| Input Frequency Range (Crystal Input) | 10 to 40 MHz |
| Differential Output Types | LVPECL, LVDS, HCSL, or Hi-Z (Selectable Per Bank) |
| LVCMOS Output | With Synchronous Enable Input |
| VCCCore Supply | 3.3 V ± 5% |
| VCCOOutput Supplies | 3 Independent 3.3 V/2.5 V ± 5% |
| Additive Jitter (LVPECL) at 156.25 MHz | 20 fs RMS (10 kHz to 1 MHz), 51 fs RMS (12 kHz to 20 MHz) |
| PSRR (LVPECL/LVDS) at 156.25 MHz | -65 / -76 dBc |
Key Features
- 3:1 Input Multiplexer: Two universal inputs and one crystal input.
- Universal Inputs: Operate up to 3.1 GHz and accept LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or single-ended clocks.
- Crystal Input: Accepts a 10 to 40 MHz crystal or single-ended clock.
- Differential Outputs: Two banks with 4 differential outputs each, configurable as LVPECL, LVDS, HCSL, or Hi-Z.
- LVCMOS Output: With synchronous enable input for runt-pulse-free operation.
- Pin-Controlled Configuration.
- High PSRR: -65 / -76 dBc (LVPECL/LVDS) at 156.25 MHz.
- Low Additive Jitter: 20 fs RMS (10 kHz to 1 MHz), 51 fs RMS (12 kHz to 20 MHz) for LVPECL outputs.
Applications
The LMK00308SQE/NOPB is suitable for various high-frequency applications requiring low-jitter clock distribution and level translation. These include:
- Telecommunication systems.
- Data centers and cloud infrastructure.
- High-speed data acquisition systems.
- Networking equipment.
- Industrial automation and control systems.
Q & A
- What is the maximum frequency of the universal inputs on the LMK00308SQE/NOPB?
The universal inputs can operate up to 3.1 GHz. - What types of differential outputs can the LMK00308SQE/NOPB provide?
The differential outputs can be configured as LVPECL, LVDS, HCSL, or Hi-Z. - What is the operating temperature range of the LMK00308SQE/NOPB?
The operating temperature range is -40°C to +85°C. - How many differential output banks does the LMK00308SQE/NOPB have?
It has two banks, each with 4 differential outputs. - What is the additive jitter of the LVPECL outputs at 156.25 MHz?
The additive jitter is 20 fs RMS (10 kHz to 1 MHz) and 51 fs RMS (12 kHz to 20 MHz). - Does the LMK00308SQE/NOPB support RoHS compliance?
Yes, the LMK00308SQE/NOPB is RoHS compliant. - What is the package type of the LMK00308SQE/NOPB?
The package type is a 40-lead WQFN (6 mm × 6 mm). - Can the LMK00308SQE/NOPB accept a crystal input?
Yes, it can accept a 10 to 40 MHz crystal or single-ended clock input. - What are the supply voltages for the LMK00308SQE/NOPB?
The core supply is 3.3 V ± 5%, and there are three independent output supplies of 3.3 V/2.5 V ± 5%. - Is the LMK00308SQE/NOPB suitable for industrial applications?
Yes, it is suitable for industrial applications due to its industrial temperature range and robust features.
