Overview
The LMK03318RHST, produced by Texas Instruments, is an ultra-low-noise PLLATINUM™ clock generator designed to meet the stringent requirements of high-speed digital systems. This device features a single fractional-N frequency synthesizer with an integrated VCO, offering flexible clock distribution and fanout capabilities. It is equipped with pin-selectable configuration states stored in on-chip EEPROM, allowing for multiple custom device modes without the need for serial programming. The LMK03318RHST is optimized for reducing BOM cost and board area by replacing multiple oscillators and clock distribution devices, thereby improving system reliability and reducing bit-error rates in high-speed serial links.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Jitter (RMS Typical, FOUT > 100 MHz) | 100 fs | |
| PSNR | –80 dBc | |
| Output Types | Up to 8 AC-LVPECL, AC-LVDS, AC-CML, HCSL, or LVCMOS | |
| Input Frequencies | Crystal: 10 to 52 MHz, External: 1 to 300 MHz | |
| Supply Voltage | 3.3 V (Core), 1.8 V, 2.5 V, or 3.3 V (Output) | V |
| Operating Temperature Range | –40°C to 85°C | °C |
| Package Type | 48-Pin QFN | |
| Output Frequency Range | Up to 1 GHz | Hz |
Key Features
- Ultra-low noise and high performance with 100-fs RMS typical jitter for frequencies above 100 MHz and a PSNR of –80 dBc.
- Flexible device options with up to 8 outputs configurable as AC-LVPECL, AC-LVDS, AC-CML, HCSL, or LVCMOS.
- Dual inputs with automatic or manual selection: crystal input (10 to 52 MHz) and external input (1 to 300 MHz).
- Frequency margining options including fine frequency margining using a low-cost pullable crystal and glitchless coarse frequency margining using output dividers.
- Pin mode, I2C mode, and EEPROM mode for configuration, with 71-pin selectable pre-programmed default start-up options.
- Industrial temperature range operation from –40°C to 85°C.
- Integrated EEPROM for storing configuration states and programmable through an I2C-compatible serial interface.
Applications
- Switches and routers
- Network and telecom line cards
- Servers and storage systems
- Wireless base stations
- PCIe Gen1, Gen2, Gen3, Gen4
- Test and measurement equipment
- Broadcast infrastructure
Q & A
- What is the typical jitter performance of the LMK03318RHST?
The LMK03318RHST has a typical jitter of 100 fs RMS for output frequencies above 100 MHz.
- What types of output signals can the LMK03318RHST generate?
The device can generate up to 8 outputs configurable as AC-LVPECL, AC-LVDS, AC-CML, HCSL, or LVCMOS.
- What are the input frequency ranges for the LMK03318RHST?
The device accepts crystal inputs from 10 to 52 MHz and external inputs from 1 to 300 MHz.
- How does the LMK03318RHST support frequency margining?
The device supports fine frequency margining using a low-cost pullable crystal and glitchless coarse frequency margining using output dividers.
- What is the operating temperature range of the LMK03318RHST?
The device operates within an industrial temperature range of –40°C to 85°C.
- How is the LMK03318RHST configured?
The device can be configured via pin mode, I2C mode, or EEPROM mode, with 71-pin selectable pre-programmed default start-up options.
- What types of applications is the LMK03318RHST suitable for?
The device is suitable for switches and routers, network and telecom line cards, servers and storage systems, wireless base stations, PCIe applications, test and measurement equipment, and broadcast infrastructure.
- How does the LMK03318RHST improve system reliability?
The device improves system reliability by reducing bit-error rates in high-speed serial links due to its ultra-low jitter performance and by replacing multiple oscillators and clock distribution devices.
- Can the LMK03318RHST be programmed through a serial interface?
Yes, the device registers and on-chip EEPROM settings are fully programmable through an I2C-compatible serial interface.
- What is the package type of the LMK03318RHST?
The device is available in a 48-Pin QFN package.
