LA76075 Datasheet, PDF (25/35 Pages) Sanyo Semicon Device – NTSC Color Television Sets

LA76075
Continued from preceding page.
Item
[RGB Output (Cutoff,
Drive) Block]
Measurement
Symbol
Point
Bias (cutoff) control
Vbias0
(min)
(max) Vbias128
28
Bias (cutoff) control
resolution
Vbiassns
29
30
Sub bias control
resolution
Vsbiassns
Drive adjustment
maximum output
RGBout127
28
29
Drive adjustment output
attenuation
RGBout0
30
Rϒ
28
Gamma characteristic
Gϒ
29
Bϒ
30
Input
Signal
L-50
L-50
L-100
L-100
Measurement Procedure
Bus Condition
For the following measurements, set the pix bus bits to
127.
Pix : 1111111
Measure Vbias0* (where * = R, G, B), the 0 IRE DC
output levels (V) at pins 28 (RED OUT), 29 (GRN Sub-Brightness : 0000000
OUT), and 30 (BLU OUT).
Measure Vbias128* (where * = R, G, B), the 0 IRE DC Sub-Brightness : 1111111
output levels (V) at pins 28 (RED OUT), 29 (GRN Red/Green/Blue Bias :
OUT), and 30 (BLU OUT).
1111111
Measure BAS80* (where * = R, G, B), the 0 IRE DC
output levels (V) at pins 28 (RED OUT), 29 (GRN
OUT), and 30 (BLU OUT).
Red/Green/Blue Bias :
1010000
Measure BAS48* (where * = R, G, B), the 0 IRE DC
output levels (V) at pins 28 (RED OUT), 29 (GRN
OUT), and 30 (BLU OUT).
Red/Green/Blue Bias :
0110000
Vbiassns* = (BAS80)* – BAS48*)/32
Measure SBTPM* (where* = R, G, B), the 0 IRE DC Red/Green/Blue Bias :
output levels (V) at pins 28 (RED OUT), 29 (GRN 0101010
OUT), and 30 (BLU OUT).
Pix : 011111
Vbiassns* = (BRTPC* – SBTPM8*)
Measure DRVH* (where * = R, G, B), the 100 IRE DC
output amplitude (Vp-p) at pins 28 (RED OUT), 29 Brightness : 0000000
(GRN OUT), and 30 (BLU OUT).
Measure DRVL* (where * = R, B), the 100 IRE DC
output amplitude (Vp-p) at pins 28 (RED OUT), 29
(GRN OUT), and 30 (BLU OUT).
Brightness : 0000000
Red/Blue Deive : 0000000
RGBout0* = 20log(DRVH*/DRVL*)
For the following measurements, set both the pix and Pix : 0111111
brightness bus bits to 63.
Brightness : 01111111
Measure *A and *B (where * = R, G, B), the 100 IRE
DC output amplitude (Vp-p) at pins 28 (RED OUT), 29
(GRN OUT), and 30 (BLU OUT) with gamma def off
Gamma Def : Off, On
(*A) and then on (*B).
*ϒ = 100 * (*A/*B)
No. 5845-25/35