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THS8133A Datasheet(PDF) 8 Page - Texas Instruments |
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THS8133A Datasheet(HTML) 8 Page - Texas Instruments |
8 / 25 page THS8133, THS8133A, THS8133B TRIPLE 10BIT, 80 MSPS VIDEO D/A CONVERTER WITH TRILEVEL SYNC GENERATION SLVS204C − APRIL 1999 − REVISED SEPTEMBER 2000 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 blanking generation (continued) Value Corresponds to D(0) CLK th ts D(0) td(D) td(D) td(D) td(D) SYNC SYNC_T BLANK RPr[9−0] GY[9−0] BPb[9−0] D(1) Figure 6. Sync and Blanking Generation DAC operation The analog output drivers generate a current of which the drive level can be user-modified by choice of an appropriate resistor value RFS, connected to the FSADJ terminal. Refer to the paragraph on output amplitude control for details on how the output drive is affected by the operation mode of the device. All current sources derive their amplitudes from an internal generator that produces a 1.35-V reference level. All current source amplitudes (video, blanking, sync) also come from this reference so that the relative amplitudes of sync/blank/video are always equal to their nominal relationships. For increased stability on the absolute levels, the user can overdrive the reference by directly driving the VREF input terminal. output amplitude control The current drive on all three output channels and on the internal sync generator is controlled by a resistor RFS that must be connected between FSADJ and AVSS. In all operation modes the relative amplitudes of the current drivers are maintained irrespective of the RFS value, as long as a maximum current drive capability is not exceeded. The sync generator is composed of different current sources that are internally routed to a corresponding DAC output. Depending on the setting of INS3_INT during SYNC low, the sync current drive is added to either only the green channel output (sync-on-green) if INS3_INT = L or all three channel outputs INS3_INT = H. In either case the relative current levels, as defined below, are maintained. |
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