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參數(shù)資料
| 型號(hào)： | TA1276AF |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | 14 X 20 MM, 0.80 MM PITCH, PLASTIC, QFP-80 |
| 文件頁數(shù)： | 30/83頁 |
| 文件大小： | 1585K |
| 代理商： | TA1276AF |
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TA1276AF
2002-01-29
36
Test Conditions
Test Conditions (unless otherwise stated, VCC1 = 5 V, VCC2/VCC3/DEF VCC = 9 V, Ta = 25 ± 3°C)
Switching Mode
Note
Parameter
SW15
SW49
SW50
SW53
Test Conditions
Video Block
Video block common test conditions
1)
SW13: A, SW18: ON, SW20: ON, SW23: ON, SW33: A, SW34: A, SW35: A, SW37: A, SW38: A, SW39: A, SW46: ON,
SW51: B, SW52: B
2)
For testing, see the picture sharpness AC characteristics testing circuit diagram. After using the preset values to
transmit the BUS control data, set ACB operation switching to ACB off (01).
3)
Ensure the composite signal is always input to pin 52 (Y1/sync input).
V1
Black Detect Level Shift
C
OFF
C
1)
Set the BUS control data to the preset value.
2)
Connect pin 78 to an external power supply (PS) and observe pin 2.
3)
Turn the Y mute off (1), turn the black stretch gain off (1), and set the black detect level to 0 IRE (1).
4)
Increase the PS voltage from 5 V and measure the DC differential VB of pin 3 where the picture period (high period) of
pin 2 goes low.
5)
Set the black detect level to 3 IRE (0).
6)
As in 4), measure the DC differential VB3 of pin 3.
V2
Black Stretch Amp Maximum
Gain
↑
A
1)
Set the BUS control data to the preset value.
2)
Set SW50 to A (maximum gain) and input a 500 kHz sine wave to TP78.
3)
Use pin 78 to adjust the signal amplitude to 0.1 Vp-p.
4)
Turn the Y mute off (1), turn the black stretch gain off (1), and measure the amplitude VA of pin 3.
5)
Turn the black stretch gain on (0) and measure the amplitude VB of pin 3.
6)
Calculate the GBS using the following formula.
GBS = VB ÷ VA
Pin 38
VB.VB3
Pin 3
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