Date: 19/04/2010

BOM saving clock IC from National for video equipment

The new triple-rate (3G/HD/SD) audio/video clock generator IC LMH1983 from National Semiconductor saves your design from using external clock conditioning circuit in high-end video equipment applications. The LMH1983 produces all the major video and audio reference clocks with low output jitter (40 ps peak-to-peak).

The BOM cost saving LMH1983 has internal phase-lock loops (PLLs), voltage-controlled crystal oscillators (VCXOs) and does not require any external loop filters. LMH1983 generates four simultaneous low-voltage differential signaling (LVDS) clocks which includes SD video, HD video (2x) and audio clocks with top-of-frame timing pulses requiring less programming effort for FPGA board designers. The LMH1983 is compliant with SMPTE serial digital interface (SDI) video and digital audio AES3/EBU standards for 1080p high-definition (HD) video cameras and video capture, conversion, processing, editing and distribution equipment.

LMH1983 provides the SMPTE 424M system clocks of frequency148.5 MHz and 148.5/1.001 MHz required by the advanced FPGAs used in video equipment. The other features include automatic input format detection, digital frequency holdover on loss of reference and simple programming of multiple A/V output formats, and genlock or digital free-run modes.

LMH1983 recognizes HVF syncs for the major video standards and 27 MHz, 10 MHz and 32/44.1/48/96 kHz audio word clocks. It includes an I2C compatible bus interface for programming device registers and reading device status. The LMH1983 operates from a 3.3V supply and features power efficient operation. Each PLL can be independently powered on/off to conserve system power.

Package: 40-pin LLP package

Price: Each $16 for 1K pieces
Availability: Now