Overview
The LMH1983SQE/NOPB, produced by Texas Instruments, is a highly integrated programmable audio/video (A/V) clock generator. This component is designed for broadcast and professional applications, particularly in the realm of SMPTE serial digital video (SDI) and digital audio AES3/EBU standards. It features a dual-stage PLL architecture with four PLLs and three on-chip VCOs, enabling simultaneous generation of major digital A/V clock fundamental rates.
The device supports various video and audio standards, including 27 MHz, 13.5 MHz, 148.5 MHz, and 74.25 MHz, among others. It also includes features like automatic input format detection, simple programming of multiple A/V output formats, and genlock or digital free-run modes. The LMH1983SQE/NOPB operates on a 3.3 V single supply and includes an I2C interface for configuration and control.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 3.3 | V |
| Package Type | 40-WQFN Exposed Pad | |
| Pin Count | 40 | |
| Operating Temperature Range | -40 to 85 | °C |
| Junction Temperature | 150 | °C |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | |
| ESD Ratings (HBM) | 2500 | V |
| PLL1 Frequency | 27 or 13.5 MHz | |
| PLL2 Frequency | 148.5 or 74.25 MHz | |
| PLL3 Frequency | 148.5/1.001 or 74.25/1.001 MHz | |
| PLL4 Frequency | 98.304 MHz / 2X (X = 0 to 15) | |
| Output Jitter (CLKout1) | 2.7 ps | |
| Output Jitter (CLKout4) | 15 ps |
Key Features
- Four PLLs for simultaneous A/V clock generation supporting SMPTE SDI and AES3/EBU standards.
- Dual-stage PLL architecture with three on-chip VCOs.
- Automatic input format detection and simple programming of multiple A/V output formats.
- Genlock or digital free-run modes with soft resynchronization to new reference.
- Digital holdover or free-run on loss of reference with status flags for loss of reference and PLL lock.
- Flexible PLL bandwidth to optimize jitter performance and lock time.
- 3 x 2 Video Clock Crosspoint for flexible clock routing.
- I2C interface with address select pin for configuration and control.
- 3.3 V single supply operation.
- Low-jitter reference clocks for SDI transmitters without additional clock cleaning circuits.
Applications
- Triple Rate (3G/HD/SD) SDI SerDes.
- FPGA Reference Clock Generation/Cleaning.
- Audio Embed or De-embed.
- Video Cameras.
- Frame Synchronizers (Genlock, DARS).
- A-D or D-A Conversion, Editing, Processing Cards.
- Keyers and Logo Inserters.
- Format or Standards Converters.
- Video Displays and Projectors.
- A/V Test and Measurement Equipment.
Q & A
- What is the primary function of the LMH1983SQE/NOPB?
The LMH1983SQE/NOPB is a highly integrated programmable audio/video (A/V) clock generator designed for broadcast and professional applications.
- What are the frequencies supported by the PLLs in the LMH1983SQE/NOPB?
The PLLs support frequencies such as 27 MHz, 13.5 MHz, 148.5 MHz, 74.25 MHz, and others as specified in the datasheet.
- What is the operating supply voltage of the LMH1983SQE/NOPB?
The operating supply voltage is 3.3 V.
- What is the package type of the LMH1983SQE/NOPB?
The package type is 40-WQFN Exposed Pad.
- Does the LMH1983SQE/NOPB support I2C interface?
Yes, it includes an I2C interface with an address select pin for configuration and control.
- What are the key applications of the LMH1983SQE/NOPB?
Key applications include triple rate SDI SerDes, FPGA reference clock generation, audio embed or de-embed, video cameras, and more.
- How does the LMH1983SQE/NOPB handle loss of reference?
The device can be programmed to hold the control voltage to maintain output accuracy within ±0.5 ppm (typical) of the previous reference upon loss of reference.
- What is the moisture sensitivity level (MSL) of the LMH1983SQE/NOPB?
The MSL is 3 (168 Hours).
- What are the ESD ratings for the LMH1983SQE/NOPB?
The ESD ratings are 2500 V for the human-body model (HBM).
- Does the LMH1983SQE/NOPB support genlock or free-run modes?
Yes, it supports both genlock and digital free-run modes with soft resynchronization to new reference.
