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參數(shù)資料
| 型號： | UPC1876 |
| 廠商： | NEC Corp. |
| 英文描述： | US MTS DECODER |
| 中文描述： | 美國的多邊貿易體制解碼器 |
| 文件頁數(shù)： | 20/40頁 |
| 文件大?。?/td> | 309K |
| 代理商： | UPC1876 |
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μ
PC1876
20
Data Sheet S11666EJ4V0DS00
4. PRECAUTIONS
4.1 Impedance of Input Pins and Output Pins
Each impedance of input and output pins are the following.
Pin name
Impedance
Input
COMPOSITE SIGNAL INPUT
80 k
SAP DISCRIMINATION FILTER INPUT
40 k
SAP SINGLE INPUT
80 k
WIDE BAND VCA INPUT
80 k
MONAURAL OFFSET ABSORPTION 1
80 k
Output
SAP BPF OUTPUT
360
SAP SINGLE OUTPUT
360
VARIABLE EMPHASIS OUTPUT
360
MONAURAL OFFSET ABSORPTION 2
360
R CHANNEL OUTPUT
15
L CHANNEL OUTPUT
15
Scattering rate of impedance is about
±
30%.
4.2 Output Load Impedance
If the L CHANNEL OUTPUT pin and the R CHANNEL OUTPUT pin are connected to GND through 10 k
resistor,
they can drive 700
load impedance.
And, when connecting a load capacitance over 100 pF to the L/R CHANNEL OUTPUT pins, parasitic oscillation
can cause. In this case, insert a resistor between the L/R CHANNEL OUTPUT pins and the load capacitance. Note
that the load capacitance changes by printed-wiring pattern of set.
Caution To insert the DC load resistor (R
L
) between the L/R CHANNEL OUTPUT pins and GND, the R
L
should
be equal or more than 3 k
. Note that the DC current increments 4.5/R
L
[A] per one output pin when
inserting the R
L
, because the medium potential is 4.5 V (V
CC
= 9 V).
If the R
L
is less than 3 k
, the distortion rate may become worse extremely.
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