Product Information: CCTCM1983: National LMH1983 Clock Module

The LMH1983 is a clock module for the CTXIL671 Serial Digital Video Board for HD-SDI, SDI and DVB-ASI on Xilinx Virtex 6 and Spartan 6.

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 (4x 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 (typ.) of the previous reference. The LMH1983 can be configured to re-synchronize to a previous reference with glitch-less operation.

Cook Technologies clock modules are designed to have 4 high speed clock inputs and 4 clock outputs. Along with a number of GPIO signals to allow full control of the module from the main FPGA. The small paddle board uses 2 Samtec QTE high speed low profile board to board connectors. The CTXIL671 can support 2 clock modules at a time.

Please always download and read the latest Release Notes before ordering.
CTCM1983: $250

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