Overview
The LMK00301SQ/NOPB, produced by Texas Instruments, is a 3-GHz, 10-output differential fanout buffer designed for high-frequency, low-jitter clock and data distribution, and level translation. This component is highly versatile and power-efficient, making it ideal for replacing fixed-output buffer devices while enhancing timing margins in various systems.
The LMK00301 allows the input clock to be selected from two universal inputs or one crystal input, which is then distributed to two banks of five differential outputs and one LVCMOS output. It operates from a 3.3-V core supply and three independent 3.3-V or 2.5-V output supplies, ensuring robust performance across a wide range of applications.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | WQFN (RHS) | 48 pins |
| Operating Temperature Range | -40°C to 85°C | |
| Input Frequency Range | Universal Inputs | Up to 3.1 GHz |
| Crystal Input Frequency Range | 10 MHz to 40 MHz | |
| Differential Output Types | LVPECL, LVDS, HCSL, or Hi-Z | Selectable per bank |
| LVPECL Additive Jitter | 20 fs RMS (10 kHz to 1 MHz), 51 fs RMS (12 kHz to 20 MHz) | |
| Frequency Range | LVPECL: DC to 3100 MHz, LVDS: DC to 2100 MHz, HCSL: DC to 800 MHz, LVCMOS: DC to 250 MHz | |
| PSRR | -65 dBc (LVPECL), -76 dBc (LVDS) at 156.25 MHz | |
| Core Supply Voltage | 3.3 V ± 5% | |
| Output Supply Voltages | 3.3 V or 2.5 V ± 5% | Three independent supplies |
Key Features
- 3:1 input multiplexer with two universal inputs and one crystal input
- Two universal inputs operate up to 3.1 GHz and accept LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or single-ended clocks
- One crystal input accepts 10 MHz to 40 MHz crystal or single-ended clock
- Two banks with five 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 dBc (LVPECL) and -76 dBc (LVDS) at 156.25 MHz
- Industrial temperature range: -40°C to +85°C
Applications
- Clock distribution and level translation for ADCs, DACs, multi-gigabit Ethernet, XAUI, Fibre Channel, SATA/SAS, SONET/SDH, CPRI
- Switches, routers, line cards, timing cards
- Servers, computing, PCI Express (PCIe 3.0, 4.0, 5.0, 6.0)
- Remote radio units and baseband units
- High-frequency backplanes
Q & A
- What is the maximum frequency range for the universal inputs of the LMK00301?
The universal inputs of the LMK00301 operate up to 3.1 GHz.
- What types of differential outputs can the LMK00301 provide?
The LMK00301 can provide LVPECL, LVDS, HCSL, or Hi-Z differential outputs, selectable per bank.
- What is the additive jitter performance of the LMK00301?
The LMK00301 has an additive jitter of 20 fs RMS (10 kHz to 1 MHz) and 51 fs RMS (12 kHz to 20 MHz) with an LMK03806 clock source at 156.25 MHz.
- What is the operating temperature range of the LMK00301?
The LMK00301 operates within an industrial temperature range of -40°C to +85°C.
- How many output banks does the LMK00301 have, and what is the configuration of each bank?
The LMK00301 has two banks, each with five differential outputs. These outputs can be independently configured as LVPECL, LVDS, HCSL, or Hi-Z drivers, or disabled.
- What are the core and output supply voltage requirements for the LMK00301?
The core supply voltage is 3.3 V ± 5%, and there are three independent output supply voltages that can be either 3.3 V or 2.5 V ± 5%.
- Does the LMK00301 require power supply sequencing?
The LMK00301 requires power supply sequencing where all core and output supplies must ramp at the same time or be tied together. However, the LMK00301A design spin does not have this requirement.
- What is the purpose of the LVCMOS output with a synchronous enable input?
The LVCMOS output has a synchronous enable input to ensure runt-pulse-free operation when enabled or disabled.
- In what types of applications is the LMK00301 commonly used?
The LMK00301 is commonly used in clock distribution and level translation for various high-speed applications, including ADCs, DACs, Ethernet, Fibre Channel, and more.
- What is the package type and pin count of the LMK00301?
The LMK00301 comes in a WQFN (RHS) package with 48 pins.
