Overview
The LMK04808BISQ/NOPB from Texas Instruments is a high-performance clock conditioner designed to provide superior clock jitter cleaning, generation, and distribution. This component is part of the LMK0480x family, which is renowned for its industry-leading performance in clock conditioning. The device features a dual loop PLLatinum™ architecture, comprising two high-performance phase-locked loops (PLLs), a low-noise crystal oscillator circuit, and a high-performance voltage-controlled oscillator (VCO). This architecture enables the LMK04808 to achieve ultra-low RMS jitter performance, making it ideal for next-generation system requirements.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | WQFN (NKD) | - |
| Pins | 64 | - |
| Operating Temperature Range | -40 to 85 | °C |
| VCC Supply Voltage | 3.15 to 3.45 | V |
| RMS Jitter (12 kHz to 20 MHz) | 111 fs | - |
| RMS Jitter (100 Hz to 20 MHz) | 123 fs | - |
| Phase Detector Rate | Up to 155 MHz | - |
| Normalized PLL Noise Floor | -227 dBc/Hz | - |
| Output Divides | 1 to 1045 (Even and Odd) | - |
| Output Types | LVPECL, LVDS, or LVCMOS | - |
| Maximum Clock Rate | Up to 1536 MHz | - |
| Differential Outputs | Up to 14 | - |
| Single-Ended Outputs | Up to 26 | - |
| VCXO/Crystal Buffered Outputs | Up to 6 | - |
Key Features
- Ultra-Low RMS Jitter Performance: Achieves 111 fs RMS jitter (12 kHz to 20 MHz) and 123 fs RMS jitter (100 Hz to 20 MHz).
- Dual Loop PLLatinum™ PLL Architecture: Includes two high-performance PLLs, a low-noise crystal oscillator circuit, and a high-performance VCO.
- Integrated Low-Noise Crystal Oscillator Circuit: Can be configured with an external VCXO module or an integrated crystal oscillator with an external tunable crystal and varactor diode.
- Holdover Mode: Maintains clock output when input clocks are lost, with automatic or manual triggering/recovery.
- Redundant Input Clocks with LOS: Supports two redundant input clocks with loss of signal (LOS) detection and automatic/manual switch-over modes.
- Programmable Outputs: Offers 12 LVPECL, LVDS, or LVCMOS programmable outputs, with 50% duty cycle output divides from 1 to 1045 (even and odd).
- Digital Delay: Fixed or dynamically adjustable digital delay, and 25 ps step analog delay control.
- Multi-Mode Operation: Supports dual PLL, single PLL, and clock distribution modes.
- Industrial Temperature Range: Operates from -40°C to 85°C.
- 0-Delay Mode and Default Clock Outputs: Features 0-delay mode and three default clock outputs at power up).
Applications
- Data Converter Clocking: Ideal for high-precision data converters requiring low jitter clocks.
- Wireless Infrastructure: Used in wireless base stations and other infrastructure equipment.
- Networking, SONET/SDH, DSLAM: Suitable for networking equipment, SONET/SDH systems, and DSLAMs.
- Medical, Video, Military, Aerospace: Applied in various medical, video, military, and aerospace applications).
- Test and Measurement: Utilized in test and measurement equipment requiring high precision and low jitter clocks).
Q & A
- What is the primary function of the LMK04808BISQ/NOPB?
The primary function of the LMK04808BISQ/NOPB is to provide superior clock jitter cleaning, generation, and distribution using its dual loop PLLatinum™ architecture.
- What is the RMS jitter performance of the LMK04808BISQ/NOPB?
The device achieves 111 fs RMS jitter (12 kHz to 20 MHz) and 123 fs RMS jitter (100 Hz to 20 MHz)).
- What types of output signals does the LMK04808BISQ/NOPB support?
The device supports LVPECL, LVDS, or LVCMOS programmable outputs).
- How many differential and single-ended outputs does the LMK04808BISQ/NOPB have?
The device has up to 14 differential outputs and up to 26 single-ended outputs).
- What is the maximum clock rate supported by the LMK04808BISQ/NOPB?
The maximum clock rate supported is up to 1536 MHz).
- Does the LMK04808BISQ/NOPB support redundant input clocks?
Yes, it supports two redundant input clocks with loss of signal (LOS) detection and automatic/manual switch-over modes).
- What is the operating temperature range of the LMK04808BISQ/NOPB?
The device operates from -40°C to 85°C).
- What are some common applications of the LMK04808BISQ/NOPB?
Common applications include data converter clocking, wireless infrastructure, networking, SONET/SDH, DSLAM, medical, video, military, aerospace, and test and measurement equipment).
- What is the package type and pin count of the LMK04808BISQ/NOPB?
The device is packaged in a 64-pin WQFN (NKD) package).
- Does the LMK04808BISQ/NOPB have a holdover mode?
Yes, it has a holdover mode that maintains the clock output when input clocks are lost, with automatic or manual triggering/recovery).
