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参数资料
| 型号： | TA8701AN |
| 元件分类： | 接收器 |
| 英文描述： | AUDIO/VIDEO DEMODULATOR, PDIP24 |
| 封装： | 0.300 INCH, 1.78 MM PITCH, PLASTIC, SDIP-24 |
| 文件页数： | 19/19页 |
| 文件大小： | 478K |
| 代理商： | TA8701AN |
TA8701AN
2001-05-10
9
TEST CONDITIONS
Note 1: Input sensitivity
PIF input (Pin 4)
: fo = 58.75MHz, fm = 15.75kHz, 30% AM, 84dBV.
Gradually reduce the input level. Measure the input level when the detection output at video output (Pin
19-a) will be 3dB.
Note 2: Maximum input level
PIF input (Pin 4)
: Input same as Note 1.
Gradually raise the input level. Measure the input level when the detection output at video output (Pin 19-a)
is at the noise inverter threshold.
Note 3: Differential gain / Differential phase
PIF input (Pin 4)
: fo = 58.75MHz, Standard television signal (V / S = 10 : 4 ramp waveform),
87.5% AM, 84dBV.
IF AGC = Free.
Measure the differential gain and differential phase with a vector scope. (Pin 19-b)
Note 4: No-signal output level
PIF input (Pin 4)
: No input. 2nd AGC terminal (Pin 1) : GND, Measure DC voltage at video output
(Pin 19-a).
Note 5: Sync. Tip level
PIF input (Pin 4)
: Input same as Note 3. Measure Sync. Tip DC voltage at video output (Pin 19-b).
Note 6: Video output amplitude
PIF input (Pin 4)
: Input same as Note 3. Measure amplitude level at video output (Pin 19-b).
Note 7: Noise inverter
PIF input (Pin 4)
: fo = 57~65MHz (Sweep Signal), 84dBV.
Connect monitor scope to video output (Pin 19-b).
Measure the 2nd AGC terminal (Pin 1) voltage and fix the terminal to that voltage using the external power
supply.
Then, 2nd AGC Voltage variable when a waveform like that in the accompanying diagram is output.
AD: Black noise inverter level.
BC: Black noise clamp level.
EH: White noise inverter level.
FG: White noise clamp level.
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