Overview
The Texas Instruments LMK03328RHSR is an ultra-low-noise clock generator designed to meet the stringent requirements of high-speed serial interfaces and digital devices. This device features two independent fractional-N frequency synthesizers with integrated Voltage-Controlled Oscillators (VCOs), providing flexible clock distribution and fan-out capabilities. The LMK03328RHSR is equipped with pin-selectable configuration states stored in an on-chip EEPROM, allowing for a high degree of customization and ease of use. It is particularly suited for reducing the Bill of Materials (BOM) cost and board area by replacing multiple oscillators and clock distribution devices, while also improving reliability and reducing bit error rates (BER) in high-speed serial links.
Key Specifications
| Parameter | Value |
|---|---|
| Jitter (RMS typical, FOUT > 100MHz) | 100 fs |
| PSNR | –80 dBc |
| Output Types | Up to 8 AC-LVPECL, AC-LVDS, AC-CML, HCSL or LVCMOS |
| Configuration Modes | Pin mode, I2C mode, and EEPROM mode |
| Default Start-up Options | 71-pin selectable pre-programmed options |
| Input Frequencies | Crystal: 10 MHz to 52 MHz, External: 1 MHz to 300 MHz |
| Frequency Margining | Fine: ±50 ppm using pullable crystal reference, Coarse: using output dividers |
| Supply Voltages | 3.3V core, 1.8V, 2.5V, 3.3V output |
| Operating Temperature Range | –40°C to 85°C |
| Package | 7mm × 7mm 48-WQFN |
Key Features
- Ultra-low noise and high performance with 100 fs RMS typical jitter for frequencies above 100 MHz.
- Robust supply noise immunity with a PSNR of –80 dBc.
- Flexible device options with up to 8 differential outputs in various formats (AC-LVPECL, AC-LVDS, AC-CML, HCSL, or LVCMOS).
- Multiple configuration modes including pin mode, I2C mode, and EEPROM mode.
- Dual inputs with automatic or manual selection.
- Frequency margining options including fine margining using a pullable crystal reference and coarse margining using output dividers.
- Industrial temperature range operation from –40°C to 85°C.
- Compact 7mm × 7mm 48-WQFN package.
Applications
The LMK03328RHSR is ideal for various high-speed serial interfaces and digital devices, including but not limited to:
- Multi-gigabit serial interfaces such as Ethernet, Fibre Channel, and PCIe.
- High-speed digital devices requiring low-jitter clock signals.
- Telecommunication and networking equipment.
- Data centers and cloud infrastructure.
- Aerospace and defense applications requiring high reliability and low noise.
Q & A
- What is the typical jitter performance of the LMK03328RHSR?
The LMK03328RHSR has a typical jitter of 100 fs RMS for output frequencies above 100 MHz. - What types of output signals can the LMK03328RHSR generate?
The device can generate up to 8 differential outputs in AC-LVPECL, AC-LVDS, AC-CML, HCSL, or LVCMOS formats. - What are the configuration modes available for the LMK03328RHSR?
The device supports pin mode, I2C mode, and EEPROM mode for configuration. - What is the operating temperature range of the LMK03328RHSR?
The device operates within an industrial temperature range of –40°C to 85°C. - How many inputs does the LMK03328RHSR have and what are their frequency ranges?
The device has dual inputs with frequency ranges of 10 MHz to 52 MHz for crystal input and 1 MHz to 300 MHz for external input. - What are the supply voltage options for the LMK03328RHSR?
The device has a 3.3V core supply and supports output voltages of 1.8V, 2.5V, and 3.3V. - What is the package type and size of the LMK03328RHSR?
The device is packaged in a 7mm × 7mm 48-WQFN package. - How does the LMK03328RHSR improve system reliability?
The device improves reliability by replacing multiple oscillators and clock distribution devices, reducing BOM cost and board area. - What is the significance of the PSNR of –80 dBc in the LMK03328RHSR?
The PSNR of –80 dBc indicates robust supply noise immunity, which is crucial for maintaining signal integrity in high-speed applications. - Can the LMK03328RHSR be used in aerospace and defense applications?
Yes, the device is suitable for aerospace and defense applications due to its high reliability and low noise performance.
