TA1316AN Datasheet, PDF (77/115 Pages) Toshiba Semiconductor – YCbCr/YPbPr Signal and Sync Processor for Digital TV, Progressive Scan TV and Double Scan TV

Note No.
Parameter
P26 APACON white peak limiter
TA1316AN
Test Conditions
SW mode
SW1 SW2 SW3 SW56
Test Method (test conditions: V_CC = 9 V/2 V, Ta = 25° ± 3°C)
B
B
A
ON (1) Set picture mute to off (P-MODE: Normal1 (000)), UNI-COLOR to 1101000, SHR-TRACKING to SRT-GAIN
maximum (00) and CDE to maximum (11). Input T pulse signal (0.7 V_P-P) to TPA.
(2) Set PICTURE-SHARPNESS to maximum (111111) and APACON PEAK f₀ to 5 M (11), and monitor pin 43.
(3) When APACON white peak limiter is off (000), measure positive spike amplitude V_WPLOFF1.
(4) When APACON white peak limiter is at maximum (111), measure positive spike amplitude V_WPLMAX1.
(5) Set UNI-COLOR to center (1000000). When APACON white peak limiter is off (000) and at maximum (111),
measure positive spike amplitudes V_WPLOFF2 and V_WPLMAX2.
(6) Set UNI-COLOR to minimum (0000000). When APACON white peak limiter is off (000) and at maximum
(111), measure positive spike amplitudes V_WPLOFF3 and V_WPLMAX3.
(7) Calculate using the following formulae.
G_WPL1 = 20 × "og (V_WPLMAX1/V_WPLOFF1) [dB]
G_WPL2 = 20 × "og (V_WPLMAX2/V_WPLOFF2) [dB]
G_WPL3 = 20 × "og (V_WPLMAX3/V_WPLOFF3) [dB]
V_WPLMAX
V_WPLOFF
77
2002-10-04