LMH1983
- Four PLLs for Simultaneous A/V Clock Generation
- PLL1: 27 or 13.5 MHz
- PLL2: 148.5 or 74.25 MHz
- PLL3: 148.5/1.001 or 74.25/1.001 MHz
- PLL4: 98.304 MHz / 2X (X = 0 to 15)
- 3 x 2 Video Clock Crosspoint
- Flexible PLL Bandwidth to Optimize Jitter Performance
and Lock Time - Soft Resynchronization to New Reference
- Digital Holdover or Free-run on Loss of Reference
- Status Flags for Loss of Reference and Loss of PLL Lock
- 3.3 V Single Supply Operation
- I2C Interface with Address Select Pin
(3 States)
The LMH1983 is a highly-integrated programmable audio/video (A/V) clock generator intended for broadcast and professional applications. It can replace multiple PLLs and VCXOs used in applications supporting SMPTE serial digital video (SDI) and digital audio AES3/EBU standards. It offers low-jitter reference clocks for any SDI transmitter to meet stringent output jitter specifications without additional clock cleaning circuits.
The LMH1983 features automatic input format detection, simple programming of multiple A/V output formats, genlock or digital free-run modes, and override programmability of various automatic functions. The recognized input formats include HVF syncs for the major video standards, 27 MHz, 10 MHz, and 32/44.1/48/96 kHz audio word clocks.
The dual-stage PLL architecture integrates four PLLs with three on-chip VCOs. The first stage (PLL1) uses an external low-noise 27 MHz VCXO with narrow loop bandwidth to provide a clean reference clock for the next stage. The second stage (PLL2, 3, 4) consists of three parallel VCO PLLs for simultaneous generation of the major digital A/V clock fundamental rates, including 148.5 MHz, 148.5/1.001 MHz, and 98.304 MHz (4 × 24.576 MHz). Each PLL can generate a clock and a timing pulse to indicate top of frame (TOF).
When locked to reference, an internal 10-bit ADC will track the loop filter control voltage. When a loss of reference (LOR) occurs, the LMH1983 can be programmed to hold the control voltage to maintain output accuracy within ±0.5 ppm (typical) of the previous reference. The LMH1983 can be configured to re-synchronize to a previous reference with glitch-less operation.
技术文档
类型 | 标题 | 下载最新的英语版本 | 日期 | |||
---|---|---|---|---|---|---|
* | 数据表 | LMH1983 3G/HD/SD Video Clock Generator with Audio Clock 数据表 (Rev. I) | PDF | HTML | 2014年 12月 2日 | ||
选择指南 | Broadcast and Professional Video Interface Solutions (Rev. E) | 2017年 4月 5日 | ||||
应用手册 | AN-2108 Generating 44.1 kHz Based Clocks with the LMH1983 (Rev. A) | 2013年 4月 26日 | ||||
用户指南 | LMH1983 Evaluation Kit Users Guide | 2012年 1月 25日 | ||||
设计指南 | Broadcast Video Owner's Manual | 2006年 11月 17日 |
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