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參數(shù)資料
| 型號： | TA8795BF |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP60 |
| 封裝： | 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-60 |
| 文件頁數(shù)： | 16/45頁 |
| 文件大?。?/td> | 1139K |
| 代理商： | TA8795BF |
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TA8795BF
2001-01-15 23/45
TEST CONDITIONS : VCC = 5V, Ta = 25±3°C
SW No. AND VR (VARIABLE RESISTOR) MODE
No.
PARAMETER
SYMBOL
UNIT
MIN
TYP.
MAX
SW1 SW3 SW51 SW54 SW60
CON-
TRAST
BRIGHT-
NESS
SHARP-
NESS
TEST METHOD
V15
Black stretch start
Voltage
Vst
% IRE
30
60
70
OFF ON
ON
OFF
ON
Center
Adjust
Center
1. To pin 2, input a signal with a ramp wave amplitude of
500mVp-p. The sync amplitude must be 143mVp-p and
the setup amplitude, 100mVp-p.
2. Monitor pins 2 and 60 with an oscilloscope. Set the pin
60 monitor channel to uncarrier and adjust pins 20 and
60 so that the pedestals and white peaks of both pins
overlap.
3. Compare the signals and read the voltage where the
signal starts to move to the black side ( = Vx) [mV])
using the pedestal voltage as reference.
4. Calculate following equation to seek the start voltage
Vst.Vst = Vx / (500 143) ×100 [% IRE]
V16 Black stretch gain
Gblk
1.1
1.3
1.5
OFF ON
ON
OFF
ON
Center
Adjust
Center
1. To pin 2, input a sine wave (f = 100kHz) with an
amplitude of 50mVp-p and a signal with a sync
amplitude of 143mVp-p.
2. Adjust the bright VR so that the pin 44 pedestal is
0.95V.
3. Apply a voltage of 0.65V to pin 3.
4. Apply a voltage of 1.6V to pin 59.
5. Monitoring pin 44, adjust only the signal generator sine
wave amplitude so that the sine wave amplitude is
25mVp-p.
6. Turn SW3 off. Now read the pin 44 amplitude
( = Voff [mVp-p])
7. Calculate the following equation to seek the black
stretch gain.
Gblk = Voff / 25 [times]
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