參數(shù)資料
型號: LA76075
廠商: Sanyo Electric Co.,Ltd.
英文描述: NTSC Color Television Sets
中文描述: NTSC制式彩電
文件頁數(shù): 13/35頁
文件大?。?/td> 712K
代理商: LA76075
VIF Block Input Signals and Measurement Conditions
1. Input the input signals to the VIF IN pin noted on the measurement circuit diagrams.
2. The input signal levels are the VIF IN levels noted on the measurement circuit diagrams.
3. The following table describes the input signals.
No. 5845-13/35
LA76075
Input Signal
Waveform
Conditions
45.75 MHz
SG1
42.17 MHz
SG2
41.25 MHz
SG3
Variable frequency
SG4
45.75 MHz
87.5% Video Mod.
Ten-step wave using 3.58-MHz
subcarrier
SG5
45.75 MHz
87.5% Video Mod.
Flat field signal
SG6
4. Before starting the measurements, adjust the digital-to-analog converters in the following order.
Item
Measurement Point
Input Signal
Target Value
APC DAC
13
No signal, IF.AGC.DEF = 1
Adjust to bring the DC voltage at pin 13 as close as possible to 3.8 V.
PLL DAC
13
SG1, 93 dBμ
Adjust to bring the DC voltage at pin 13 as close as possible to 3.8 V.
Video Level DAC
45
SG6, 93 dBμ
Adjust to bring the output level at pin 45 as close as possible to 2.0 Vp-p.
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