参数资料
型号: TB1245N
元件分类: 消费家电
英文描述: SPECIALTY CONSUMER CIRCUIT, PDIP56
封装: PLASTIC, SDIP-56
文件页数: 84/101页
文件大小: 1490K
代理商: TB1245N
TB1245N
2001-07-26
83
TEST CONDITION (Unless otherwise specified : H, RGB VCC = 9V ; VDD, Fsc VDD, Y / C VCC = 5V ; Ta = 25±3°C ; BUS = preset value)
SW MODE
SUB-ADDRESS & BUS DATA
NOTE
ITEM
S18 S19 S20 S21 S22 S31 S33 S34 S51 15H 04H
MEASURING METHOD
T30
Halftone Ys Level
B
A
B
A
00H 40H
T31
Halftone Gain
01H
T32
Text ON Ys, Low
Level
T33
Text / OSD Output,
Low Level
(1) Input stepping signal whose amplitude is 0.3 V in video period to
pin 31 (Y IN) and pin 48 (Sync IN).
(2) Set bus data so that blanking is off and halftone is 3 dB in on
status.
(3) Connect power supply to pin 21 (Digital Ys). While impressing 0 V
to it, measure amplitude and pedestal level of pin 13 (G OUT) in
video period (Vm13, Vp13).
(4) Raising supply voltage to pin 21 gradually from 0 V, measure level
(Vtht1) of pin 21 when amplitude of pin 13 output signal changes.
At the same time, measure amplitude and pedestal level of pin 13
in video period after the pin 13 output signal changed in amplitude.
(Vm13b, Vp13b)
(5) Set bus data so that halftone is 6 dB in on status, and perform the
same measurement as the above step 4 to find gain of 6 dB
halftone and variation of pedestal level (G6th13).
G6th13 = 20 og (Vm13b / Vm13)
(6) Raising supply voltage to pin 21 further from Vtht1, measure level
(Vttx1) of pin 21 when output signal of pin 13 (G OUT) changes in
amplitude and DC level of pin 13 after the change of its output
(Vtx13).
(7) From results of the above steps 3 and 6, calculate low level of the
output in the text mode.
Vtxl13 = Vtx13 Vp13
(8) Raising supply voltage to pin 21 by 3 V from that in the above step
6, confirm that there is no change in output level of pin 13.
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