Overview
The LMK04821NKDR is a high-performance clock conditioner and jitter cleaner from Texas Instruments, part of the PLLatinum™ series. This device is designed to meet the stringent requirements of communication infrastructure, data converters, and other high-performance applications. It features ultra-low jitter generation and distribution, making it an ideal choice for systems that demand high clock accuracy and stability.
The LMK04821NKDR supports JEDEC JESD204B and offers a wide range of programmable outputs, including LVPECL, LVDS, HSDS, and LCPECL. It is highly versatile and can be configured for various clocking needs, including traditional clocking systems and JESD204B applications.
Key Specifications
| Parameter | Specification |
|---|---|
| Package | 64-Pin WQFN (NKD) |
| Operating Temperature Range | -40°C to 85°C |
| Maximum Clock Output Frequency | 3.1 GHz |
| RMS Jitter (12 kHz to 20 MHz) | 88 fs |
| RMS Jitter (100 Hz to 20 MHz) | 91 fs |
| Noise Floor at 245.76 MHz | -162.5 dBc/Hz |
| Number of Differential Device Clocks from PLL2 | Up to 14 |
| Number of SYSREF Clocks | Up to 7 |
| Supply Voltage | 3.15-V to 3.45-V |
| PCB Temperature | Up to 105°C (measured at thermal pad) |
Key Features
- JEDEC JESD204B Support
- Ultra-Low RMS Jitter: 88 fs (12 kHz to 20 MHz) and 91 fs (100 Hz to 20 MHz)
- Low Noise Floor: -162.5 dBc/Hz at 245.76 MHz
- Up to 14 Differential Device Clocks from PLL2 and up to 7 SYSREF Clocks
- Programmable Outputs: LVPECL, LVDS, HSDS, LCPECL, and 2xLVCMOS
- Dual Loop PLLatinum™ PLL Architecture
- Up to 3 Redundant Input Clocks with Automatic and Manual Switch-Over Modes
- Hitless Switching and LOS (Loss of Signal) Detection
- Integrated Low-Noise Crystal Oscillator Circuit
- Holdover Mode When Input Clocks are Lost
- Precision Digital Delay and 25-ps Step Analog Delay
- Multi-Mode Operation: Dual PLL, Single PLL, and Clock Distribution
Applications
The LMK04821NKDR is suitable for a variety of high-performance applications, including:
- Communication Infrastructure
- Data Converters
- High-Speed Data Acquisition Systems
- Wireless and Wired Communication Systems
- High-Performance Computing and Networking Equipment
Q & A
- What is the primary function of the LMK04821NKDR?
The LMK04821NKDR is a high-performance clock conditioner and jitter cleaner designed to provide ultra-low jitter clock signals for various applications.
- What is the maximum clock output frequency of the LMK04821NKDR?
The maximum clock output frequency is 3.1 GHz.
- What types of output signals can the LMK04821NKDR generate?
The device can generate LVPECL, LVDS, HSDS, LCPECL, and 2xLVCMOS output signals.
- Does the LMK04821NKDR support JESD204B?
- What is the RMS jitter performance of the LMK04821NKDR?
The RMS jitter is 88 fs (12 kHz to 20 MHz) and 91 fs (100 Hz to 20 MHz).
- How many differential device clocks can be generated from PLL2?
Up to 14 differential device clocks can be generated from PLL2.
- What is the operating temperature range of the LMK04821NKDR?
The operating temperature range is -40°C to 85°C.
- Does the LMK04821NKDR have redundant input clock capabilities?
- What is the supply voltage range for the LMK04821NKDR?
The supply voltage range is 3.15-V to 3.45-V.
- Can the LMK04821NKDR operate in multi-mode configurations?
