具有三级同步发生的 8 位 80MSPS 三路 DAC（兼容 HDTV）
The is a general-purpose triple high-speed D/A converter DAC optimized for use in video/graphics applications. The device operates from a 5-V analog supply and a 3-V to 5-V range digital supply. The THS8134 has a sampling rate up to 80 MSPS. The device consists of three 8-bit D/A converters and additional circuitry for bi-level/tri-level sync and blanking level generation in video applications.
THS8134 is also well-suited in applications where multiple well-matched and synchronously operating DACs are needed; for example, I-Q modulation and direct-digital synthesis in communications equipment.
The current-steering DACs can be directly terminated in resistive loads to produce voltage outputs. The device provides a flexible configuration of maximum output current drive. Its output drivers are specifically designed to produce standard video output levels when directly connected to a single-ended doubly-terminated 75 coaxial cable. Full-scale video/sync is generated in a 7:3 ratio, compliant with SMPTE standards for GBR and YPbPr signals.
Furthermore, the THS8134 can generate both a traditional bi-level sync or a tri-level sync signal, as per the SMPTE standards, via a digital control interface. The sync signal is inserted on one of the analog output channels sync-on-green/luminance or on all output channels. Also, a blanking control signal sets the outputs to defined levels during the nonactive video window.
The position of this defined blanking level and the temperature range, over which the maximum imbalance between the inserted analog syncs KIMBALSYNC, are the only differences between the unrev, revA, and revB device versions. Refer to the Available Options table.
Finally the input format can be either 3×8 bit 4:4:4, 2×8 bit 4:2:2, or 1×8 bit 4:2:2. This enables a direct interface to a wide range of video DSP/ASICs including parts generating ITU-BT.656 formatted output data.
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- Triple 8-Bit D/A Converters
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- Minimum 80 MSPS Operation
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- Direct Drive of Doubly-Terminated 75- Load Into Standard Video Levels
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- 3×8 Bit 4:4:4, 2×8 Bit 4:2:2 or 1×8 Bit 4:2:2 ITU-BT.656 Multiplexed YPbPr/GBR Input Modes
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- Bi-Level EIA or Tri-Level SMPTE Sync Generation With 7:3 Video/Sync Ratio
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- Integrated Insertion of Sync-On-Green/
Luminance or Sync-On-All Channels
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- Configurable Blanking Level
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- Internal Voltage Reference
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- Applications
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- High-Definition Television HDTV Set-Top Boxes/Receivers
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- High-Resolution Image Processing
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- Desktop Publishing
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- Direct Digital Synthesis/I-Q Modulation
PowerPAD is a trademark of Texas Instruments.
See ALSO: THS8133 10 bit, pin-compatible