TA1310ANG Datasheet, PDF (36/106 Pages) Toshiba Semiconductor – NTSC VIDEO, CHROMA, DEFLECTION, AND DISTORTION COMPENSATION IC (WITH YUV INTERFACE AND ACB)

NOTE
ITEM
P₈ #56 Output Impedance
SW MODE
SW₅₄ SW₅₅ SW₅₆
1)
2)
3)
4)
5)
C
B OPEN ₆₎
(TEST CONDITIONS V_CC = 9 V / 5 V, Ta = 25 ± 3°C)
MEASUREMENT METHOD
Set the bus control data to the preset value.
Set SW₅₄ to C (connect the Y input to AC-GND).
Connect the external power supply to #56 via ammeter A as shown in the diagram below.
Adjust the power supply until the ammeter reads 0 amperes.
Measure the ammeter current I56 when the power supply is increased by 0.1 V.
Calculate Z56 from the following formula.
Z56 = 0.1 [V] ÷ I56 [A]
TA1310ANG
1) Set the bus control data to the preset value.
2) Set the black stretch start point to 001, turn the Y mute off (0), set SW₅₄ to A, and input a 500-kHz sine wave to
TP54A.
B
P₉
Black Stretching Amplifier
Maximum Gain
A
3) Use #54 to adjust the signal amplitude to 0.1 V_p-p.
↓ OPEN
4) Set SW₅₅ to B (minimum gain) and measure the amplitude V_A of #56.
A
5) Set SW₅₅ to A (maximum gain) and measure the amplitude V_B of #56.
6) Calculate G_BS from the following formula.
G_BS = V_B ÷ V_A
Note 1: When testing, see the picture sharpness test circuit diagram. First turn ACB mode off (bus control).
Note 2: Ensure the composite signal is always input to pin 38 (SYNC IN).
36
2005-09-20