TA1360AFG_05 Datasheet, PDF (44/110 Pages) Toshiba Semiconductor – YCbCr/YPbPr Signal and Sync Processor for Digital TV, Progressive Scan TV and Double Scan TV

TA1360AFG
Test Condition for Picture Quality (Sharpness) Block
Common Test Condition for Picture Quality (Sharpness) Block
1. SW67 = SW66 = B, SW63 = B, SW60 to SW61 = B, SW44 = ON, SW40 = B, SW18 to SW26 = A, SW77 = OPEN
2. Send bus control data as preset values, turn ACB operation switching to ACB OFF (00), select Sync input (1), turn P-MODE to Normal 1(000), WPL-LEVEL to
max (111), and change subaddress (1C) to (03).
3. Input sync signal, which is in sync with input signal for testing except “Sweep”, to #53 (Sync input). “H-Freq.” should be the same frequency as the one of #53.
4. Set Y/color difference input mode to (0), sync separator level to 20 % (01), and vertical free-running frequency to 307H (110).
Note No.
Characteristics
P01 Black detection level shift
SW71
B
Test Conditions
SW Mode
SW70 SW68 SW64
C
C
B
SW74
Test Method (Test condition: V_CC = 9 V/2 V, Ta = 25 ± 3°C)
OPEN 1. Connect external power supply PS to #68, and monitor #70 and #74.
2. Set black stretch point 1 to OFF (000), and black detection level to 0 IRE (1).
3. Increase PS voltage from 4.95 V in steps of 1 mV. At the moment when #70 picture period (High) drops to
Low level, monitor DC difference on #74 V_B.
4. Set black detection level to 3 IRE (0).
5. Repeat the step 3 above and monitor DC difference, V_B3 on #74.
#74 waveform
V_B, V_B3
#70 waveform
P02 Black stretch amp maximum
B
A
A
B OPEN 1. Set SW70 to A (maximum gain), and input 500-kHz sine wave to TPA.
gain
2. Adjust signal amplitude to 0.1 Vp-p on #68.
3. Set black stretch point 1 to OFF (000), and measure #74 amplitude V_A.
4. Set black stretch point 1 to 001 (black stretch ON), and measure #74 amplitude V_B.
5. Calculate GBS using a following equation.
GBS = 20 × log (V_B ÷ V_A) [dB]
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2005-08-18