TA1276AFG Datasheet, PDF (40/83 Pages) Toshiba Semiconductor – PAL/NTSC Video Chroma And Deflection IC For CTV

Note
Parameter
V₆ D.ABL Sensitivity
TA1276AFG
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 Y mute off (1), turn the black stretch gain off (1), and connect pin 8 to an external power supply.
3) With the D.ABL detect voltage at the minimum (000), plot the voltage characteristics of pin 3 in relation to the voltage
of pin 8 when D.ABL sensitivity is at the minimum (000) and the maximum (111).
4) From the diagram, calculate the S_DAMIN and S_DAMAX gradients.
S_DAMIN, S_DAMAX = ∆Y/∆X
C
ON
A
C
Pin 3
10%
100%
∆Y
V₇ Black Level Compensation
↑
OFF
↑
10%
Pin 8
∆X
1) Set the BUS control data to the preset value.
2) Turn the Y mute off (1), turn the black stretch gain off (1), and observe pin 3.
3) Turn the black level compensation on (1), measure ∆V₁ [mV], and calculate the following formula.
B_LC = (∆V₁/1.4 × 10³) × 100 (IRE)
↑
Picture period
∆V₁ [mV]
40
2002-04-01