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參數資料
| 型號： | REJ03F0023_M61140FP |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | TUNER SINGLE CHIP |
| 中文描述： | 調諧器單芯片 |
| 文件頁數： | 23/29頁 |
| 文件大?。?/td> | 571K |
| 代理商： | REJ03F0023_M61140FP |
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M61140FP
Rev.1.2, Apr.16.2004, page 23 of 28
Measurement of electrical characteristic Notes
1. Video S/N
Input SG2 to VIF IN and measure the video out (Pin 46) noise in r.m.s. at TP46B through a 5MHz (-3dB) L.P.F.
0.7xVodet
NOISE
S/N=20log
(dB)
2. Video Band Width
1. Measure the 1MHz component level of Video output TP1 with a spectrum analyzer when SG3 (f2=44.75MHz)
is input to VIF IN. At that time, measure the voltage at TP44 with SW8, set to position 2, and then fix V8 at that
voltage.
2. Reduce f2and measure the value of (f2-f1) when the (f2-f1) component level reaches -3dB from the 1MHz
component level as shown below.
Video det out
1MHz
BW
-3dB
(f2-f1)
3. Input sensitivity
Input SG4 (Vi=90dB
μ
) to VIF IN , and then gradually reduce Vi and measure the input level when the 20kHz
component of Video output TP46A reaches -3dB from Vo det level.
4. Maximum Allowable Input
1. Input SG5 (Vi=90dB
μ
) to VIF IN, and measure the level of the 20kHz component of Video output.
2. Gradually increase the Vi of SG and measure the input level when the output reaches -3dB.
5. AGC control Range
GR=VinMAX-VinMIN (dB)
6. Capture range U
1. Increase the frequency of SG9 until the VCO is out of locked-oscillation
2. And decrease the frequency of SG9 and measure the frequency fU when the VCO is locked.
CR-U=fU-45.75 (MHz)
7. Capture range L
1. Decrease the frequency of SG9 until the VCO is out of locked-oscillation.
2. And increase the frequency of SG9 and measure the frequency fL when the VCO is locked.
CR-L=45.75-fL (MHz)
8. Inter modulation
1. Input SG11 to VIF IN, and measure video output TP9 with an oscilloscope.
2. Adjust AGC filter voltage V44 so that the minimum DC level of the output waveform is 1.5V.
3. At that time, measure TP1 with a spectrum analyzer The inter modulation is defined as a difference between
0.92MHz and3.58 MHz frequency components.
9. RF AGC Operating Voltage:
Input SG8 to VIF IN and gradually reduce Vi and then measure the input level when RF AGC output reaches
1/2Vcc, as shown below.
V23
1/2Vcc
V23H
Vi
V23L
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