TA1270BFG Datasheet, PDF (24/39 Pages) Toshiba Semiconductor – PAL / NTSC VIDEO CHROMA AND SYNC PROCESSING SYSTEM FOR PIP / POP / PAP

TA1270BFG
TEST METHODS (Unless otherwise specified, SYNC / SW V_CC = 9 V, DAC / C V_CC = 5 V, preset bus data, Ta = 25°C ± 3°C)
Video block
NOTE
CHARACTERISTIC
V1 Y Input to Y Output AC Gain
V2 Y Output Offset Amount
TEST CONDITION
SUB ADDRESS & DATA
SW MODE
00
01
02
03
05 SW1 SW2 SW12
TEST METHOD
(1) Input signal 2 to Y input (Pin 40) and Yin2 input.
(f₀ = 100 kHz, picture period amplitude = 0.2 V_p-p)
(2) Change the sub address (02) data to TRAP-OFF (80h) and TRAP-ON
80
80
80
80
80
B
A
A
(84h) and perform the following :
or
84
(3) Measure the picture period amplitude (v37) of the Y output (Pin 37) and
determine the gain from Y input.
GYs, GYt = 20 log (v37 / 0.2)
(GYs ; TRAP-OFF, GYt ; TRAP-ON)
(1) Input signal 2 to Y input (Pin 40) and Yin2 input.
(f₀ = 100 kHz, picture period amplitude = 0.2 V_p-p)
(2) Set the sub address (01) data to 00 and measure the minimum potential
80
0
80
80
80
B
A
A
(VYO1) of the Y output (Pin 37) picture period amplitude.
or
81
(3) Set the sub address (05) data to Y-OFST-ON (81), measure the minimum
potential (VYO2) of the Y output picture period amplitude, and determine
the difference from VYO1.
VYO = VYO2 − VYO1
24
2005-08-18