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

POST OFFICE BOX 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

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

output amplitude control

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.