Multi-rate Video Clock Generator With Genlock - National SemiconductorThe LMH1982 is a multi-rate Video Clock Generator ideal for
use in a wide range of 3-Gbps (3G), high-definition (HD), and
standard-definition (SD) Video applications, such as Video
synchronization, serial digital Interface (SDI) serializer and
deserializer (SerDes), Video conversion, Video editing, and
other broadcast and professional Video systems.
The LMH1982 CAN generate two simultaneous SD and HD
Clocks and a Top of Frame (TOF) pulse. In genlock mode, the
device's Phase locked loops (PLLs) CAN synchronize the out-
put signals to H sync and V sync input signals applied to either
of the reference ports. The input reference CAN have Analog Timing from National's LMH1981 multi-format Video sync sep-
arator or digital Timing from an SDI deserializer and should
conform to the major SD and HD standards. When a loss of
reference occurs, the device CAN default to free run operation
where the output Timing accuracy will be determined by the
external bias on the free run control voltage input.
The LMH1982 CAN replace Discrete PLLs and field-pro-
grammable Gate array (FPGA) PLLs with multiple voltage
controlled crystal Oscillators (VCXOs). Only one 27.0000 MHz
VCXO and loop Filter are externally required for genlock
mode. The external loop Filter as well as programmable PLL
parameters CAN provide narrow loop bandwidths to minimize
jitter transfer. HD Clock output jitter as low as 40 ps peak-to-
peak CAN help designers using FPGA serializers meet strin-
gent SDI output jitter specifications.
The LMH1982 is offered in a space-saving 5 mm x 5 mm 32-
pin LLP package and provides low total power dissipation of
250 mW (typical). By National Semiconductor Corporation
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Part | Manufacturer | Description | Datasheet | Samples | |
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LMH1982SQX/NOPB | Texas Instruments | Multi-Rate Video Clock Generator with Genlock 32-WQFN 0 to 70 | |||
LMH1982SQ/NOPB | Texas Instruments | Multi-Rate Video Clock Generator with Genlock 32-WQFN 0 to 70 | |||
LMH1982SQE/NOPB | Texas Instruments | Multi-Rate Video Clock Generator with Genlock 32-WQFN 0 to 70 |
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LMH1982 Pb-Free | LMH1982 Cross Reference | LMH1982 Schematic | LMH1982 Distributor |
LMH1982 Application Notes | LMH1982 RoHS | LMH1982 Circuits | LMH1982 footprint |