TA1276AFG Datasheet, PDF (38/83 Pages) Toshiba Semiconductor – PAL/NTSC Video Chroma And Deflection IC For CTV

TA1276AFG
Note
Parameter
V₄ Black Stretch Start Point (2)
Test Conditions (unless otherwise stated, V_CC1 = 5 V, V_CC2/V_CC3/DEF V_CC = 9 V, Ta = 25 ± 3°C)
Switching Mode
SW₁₅ SW₄₉ SW₅₀ SW₅₃
Test Conditions
1) Set the BUS control data to the preset value.
2) Turn the black stretch gain off (1), turn the Y mute off (1), and turn the video mute off (0).
Input the TG7 linearity to TP53, use pin 78 to adjust the amplitude as in the diagram, set unicolor to the center
(1000000), and measure the resulting amplitude (V₄₃) of pin 11 (R OUT).
3) Turn the black stretch gain on (0), connect pin 3 to an external power supply (PS), and measure pin 11 (R OUT).
4) When the black stretch start point 2 data are at the minimum (000), calculate as in the diagram the black stretch start
point differential ∆V₀₀₀ for when P is V₄₉ (APL 0%) and for when P is V₄₉ + 1.0 [V] (APL 100%).
5) Next, when the black stretch start point 2 data are maximum (111), calculate differential ∆V₁₁₁ in the same way.
C
ON
A
6) Calculate the following formulas.
P_BS1 = (∆V_000/V₄₃) × 100
P_BS2 = (∆V₁₁₁/V₄₃) × 100
A
LINEARITY
0.7 V_p-p
0.3 V_p-p
APL 100%
APL 0%
∆V***
Pin 78 waveform
Pin 11 (R
38
2002-04-01