Overview
The LMK03328RHST, produced by Texas Instruments, is an ultra-low-noise clock generator designed to meet the stringent timing requirements of high-speed digital systems. This device features two fractional-N frequency synthesizers with integrated VCOs, providing flexible clock distribution and fan-out capabilities. It is particularly suited for applications requiring low jitter and high reliability, such as in switches, routers, network and telecom line cards, servers, storage systems, and wireless base stations. The LMK03328RHST can generate multiple clocks for various multi-gigabit serial interfaces and digital devices, reducing the bill of materials (BOM) cost and board area while improving system reliability by replacing multiple oscillators and clock distribution devices.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VDD_IN, VDD_PLL1, VDD_PLL2, VDD_DIG) | 3.135 | 3.3 | 3.465 | V |
| Supply Voltage for Output Drivers (VDDO_x) | 1.7 | 1.8, 2.5, 3.3 | 3.465 | V |
| Ambient Temperature (TA) | -40 | 25 | 85 | °C |
| Junction Temperature (TJ) | 125 | °C | ||
| RMS Jitter (FOUT > 100MHz) | 100 fs | |||
| PSNR | -80 dBc | |||
| Output Types | AC-LVPECL, AC-LVDS, AC-CML, HCSL, LVCMOS | |||
| Crystal Input Frequency | 10 MHz | 52 MHz | ||
| External Input Frequency | 1 MHz | 300 MHz | ||
| Package Type | 48-WQFN | |||
| Package Size | 7mm × 7mm |
Key Features
- Ultra-low noise and high performance with typical RMS jitter of 100 fs for frequencies above 100 MHz and PSNR of -80 dBc.
- Flexible device options with up to 8 outputs in various formats (AC-LVPECL, AC-LVDS, AC-CML, HCSL, or LVCMOS) and pin-selectable configuration states stored in an on-chip EEPROM.
- Dual inputs with automatic or manual selection, supporting crystal inputs from 10 MHz to 52 MHz and external inputs from 1 MHz to 300 MHz.
- Frequency margining options including fine frequency margining (±50 ppm typical) and glitchless coarse frequency margining using output dividers.
- Industrial temperature range (-40°C to 85°C) and multiple supply voltage options (1.8V, 2.5V, 3.3V).
- I2C, ROM, and EEPROM modes for configuration and control.
Applications
- Switches and Routers
- Network and Telecom Line Cards
- Servers and Storage Systems
- Wireless Base Stations
- PCIe Gen1, Gen2, Gen3, Gen4, Gen5, Gen6
- Test and Measurement
- Broadcast Infrastructure
Q & A
- What is the typical RMS jitter of the LMK03328RHST for frequencies above 100 MHz?
The typical RMS jitter is 100 fs for frequencies above 100 MHz. - What types of output formats does the LMK03328RHST support?
The device supports AC-LVPECL, AC-LVDS, AC-CML, HCSL, and LVCMOS output formats. - What is the range of crystal input frequencies supported by the LMK03328RHST?
The device supports crystal input frequencies from 10 MHz to 52 MHz. - What is the range of external input frequencies supported by the LMK03328RHST?
The device supports external input frequencies from 1 MHz to 300 MHz. - What are the available supply voltage options for the LMK03328RHST?
The device supports supply voltages of 1.8V, 2.5V, and 3.3V. - What is the operating temperature range of the LMK03328RHST?
The operating temperature range is -40°C to 85°C. - What package type and size does the LMK03328RHST come in?
The device comes in a 48-WQFN package with a size of 7mm × 7mm. - What are some of the key applications of the LMK03328RHST?
Key applications include switches, routers, network and telecom line cards, servers, storage systems, wireless base stations, PCIe systems, test and measurement, and broadcast infrastructure. - How does the LMK03328RHST improve system reliability?
The device improves system reliability by replacing multiple oscillators and clock distribution devices, reducing BOM cost and board area. - What configuration modes does the LMK03328RHST support?
The device supports I2C, ROM, and EEPROM modes for configuration and control.
