Overview
The LMK04821NKDT from Texas Instruments is a high-performance clock conditioner and jitter cleaner, part of the LMK0482x family. This device is renowned for its ultra-low jitter and comprehensive support for JEDEC JESD204B standards. It is designed to provide flexible and high-performance clocking solutions, making it ideal for various applications requiring precise clock management.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 64-Pin WQFN (NKD) |
| Operating Temperature Range (°C) | -40 to 85 |
| Maximum Clock Output Frequency | 3.1 GHz |
| VCO0 Frequency Range | 1930 to 2075 MHz |
| VCO1 Frequency Range | 2920 to 3080 MHz |
| 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 |
| Output Types from PLL2 | LVPECL, LVDS, HSDS, LCPECL |
| Supply Voltage Range | 3.15-V to 3.45-V |
| PCB Temperature Range | 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)
- Up to 14 Differential Device Clocks from PLL2
- Up to 7 SYSREF Clocks with DC and AC coupling
- Dual Loop PLLatinum™ PLL Architecture
- Up to 3 Redundant Input Clocks with Automatic and Manual Switch-Over Modes
- Hitless Switching and Loss of Signal (LOS) Detection
- Integrated Low-Noise Crystal Oscillator Circuit and Holdover Mode
- Precision Digital Delay and 25-ps Step Analog Delay
- Multi-Mode Operation: Dual PLL, Single PLL, and Clock Distribution
Applications
- Wireless Infrastructure
- Data Converter Clocking
- Networking, SONET/SDH, DSLAM
- Medical, Video, Military, and Aerospace
- Test and Measurement
Q & A
- What is the maximum clock output frequency of the LMK04821NKDT?
The maximum clock output frequency is 3.1 GHz.
- What types of output clocks can be generated from PLL2?
The outputs can be configured as LVPECL, LVDS, HSDS, or LCPECL.
- What is the RMS jitter performance of the LMK04821NKDT?
The RMS jitter is 88 fs (12 kHz to 20 MHz) and 91 fs (100 Hz to 20 MHz).
- Does the LMK04821NKDT support redundant input clocks?
Yes, it supports up to 3 redundant input clocks with automatic and manual switch-over modes.
- What is the operating temperature range of the LMK04821NKDT?
The operating temperature range is -40°C to 85°C.
- What is the supply voltage range for the LMK04821NKDT?
The supply voltage range is 3.15-V to 3.45-V.
- Does the LMK04821NKDT have integrated low-noise VCOs?
Yes, it has two integrated low-noise VCOs.
- What are some of the key applications for the LMK04821NKDT?
Key applications include wireless infrastructure, data converter clocking, networking, and test and measurement.
- Does the LMK04821NKDT support JESD204B standards?
Yes, it fully supports JEDEC JESD204B standards.
- What is the package type and pin count of the LMK04821NKDT?
The package type is 64-Pin WQFN (NKD).
