Pinout
Specifications| Function | Video Clock and Timing Generator |
| Supported Video Formats | NTSC , 576i/p , 480i/p , 48-kHz audio clock input, 1080i/p, 720p , PAL |
| Supply Voltage | 3.3 Volt |
| OtherSupply Voltage | 2.5V |
| Temperature Min | 0 deg C |
| Temperature Max | 70 deg C |
| View Using Catalog |
DescriptionThe 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 output 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 separator 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-programmable 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 SerDes meet stringent 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 consumption of about 250 mW (typical).
Design Tools
| Title |
Size in Kbytes |
Date |
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| LMH1982 Evaluation Software User Guide |
956 Kbytes |
19-May-2008 |
View Online |
Download |
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| LMH1982 Software Setup |
567 Kbytes |
19-May-2008 |
View |
Download |
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If you have trouble printing or viewing PDF file(s), see Printing Problems.
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Application Notes
| Title |
Size in Kbytes |
Date |
|
| AN-1841: Application Note 1841 LMH1982 Evaluation Board User Guide |
913 Kbytes |
21-May-08 |
Download |
AN-1841 (Chinese): Application Note 1841 LMH1982 Evaluation Board User Guide
|
599 Kbytes |
|
640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
| AN-1893: Application Note 1893 Demonstrating SMPTE-Compliant SDI Output Jitter Using the LMH1982 and Virtex-5 GTP Transmitter |
2197 Kbytes |
3-Oct-08 |
Download |
| AN-1971: Application Note 1971 Triple Rate SDI IP FPGA Resource Utilization on the SDXILEVK/AES-EXP-SDI-G Reference Design |
195 Kbytes |
6-May-09 |
Download |
If you have trouble printing or viewing PDF file(s), see Printing Problems.
|
More Application Notes
| Title |
Size in Kbytes |
Date |
|
| AN-1681: Application Note 1681 Design Migration from the LM1881 to the LMH1980 |
143 Kbytes |
2-Aug-07 |
Download |
AN-1681 (Japanese): Application Note 1681 Design Migration from the LM1881 to the LMH1980
640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
119 Kbytes |
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| AN-1599: Application Note 1599 LMH1981 Evaluation Board Instruction Manual |
503 Kbytes |
11-Feb-09 |
Download |
| AN-1618: Application Note 1618 LMH1980 Evaluation Board Instruction Manual |
674 Kbytes |
19-Jul-07 |
Download |
AN-1618 (Japanese): Application Note 1618 LMH1980 Evaluation Board Instruction Manual
640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram"> |
412 Kbytes |
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If you have trouble printing or viewing PDF file(s), see Printing Problems.
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LMH1982 Data Sheet
