TA1276AFG Datasheet, PDF (46/83 Pages) Toshiba Semiconductor – PAL/NTSC Video Chroma And Deflection IC For CTV

Note
Parameter
V₁₅ VSM Gain
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.
C
ON
B
2) Input the frequency F_VL sine wave to TP78.
3) Turn the Y mute off (1), turn the video mute off (0), set the aperture compensator peak frequency to 4.2M (001), and
set the amplitude of pin 78 to 0.1 V_p-p.
4) Measure the TP5 amplitudes V_L00, V_L01, V_L10, and V_L11 in the following cases.
VSM gain
0dB (00) → V_{L (H) 00}
A
−6dB (01) → V_{L (H) 01}
−9dB (10) → V_{L (H) 10}
OFF (11) → V_{L (H) 11}
5) Input the sine wave of frequency F_VH to TP78, set the aperture compensator peak frequency to 7.7M (111), and
measure the TP5 amplitudes V_H00, V_H01, V_H10, and V_H11 as above.
6) Calculate the following formulas.
G_{VL (H) 00} = 20 × Log (V_{L (H) 00}/0.1) [dB]
G_{VL (H) 01} = 20 × Log (V_{L (H) 01}/0.1) [dB] − 20 × Log (V_{L (H) 00}/0.1) [dB]
G_{VL (H) 10} = 20 × Log (V_{L (H) 10}/0.1) [dB] − 20 × Log (V_{L (H) 00}/0.1) [dB]
G_{VL (H) 11} = 20 × Log (V_{L (H) 00}/0.1) [dB]
46
2002-04-01