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參數資料
| 型號： | TA2057N |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDIP24 |
| 封裝： | SDIP-24 |
| 文件頁數： | 2/18頁 |
| 文件大?。?/td> | 970K |
| 代理商： | TA2057N |
TA2057N
2002-10-30
10
3. How to control the AM IF output signal (pin(18) output)
Pin(18) Output Signal
GND
AM DET out
V2
Vstb
AM IF out
4. AM local oscillator buffer output
The output impedance of AM local oscillator buffer output pin (pin(5) ) is 750 (typ.).
It is possible to reduce the output level to add the resistance between the pin(5) and VCC line.
The signal waveform is the rectangular wave, and the level is 500mVp-p. (fOSC = 1.45MHz (typ.) )
The higher local oscillation frequency (fOSC) to be, the lower buff output level to be owing to the load capacity.
So, in the case that it is connected to other circuits, take care of the input capacity of these circuits and stray
capacity of wire.
5. FM detector circuit
For the FM detector circuit, detector coil is able to use instead of ceramic discriminator.
Recommended circuit and recommended coil are as follows. In this case, please take care that Vin (lim.) fall a
little.
Turns
Test
Frequency
Co
(pF)
Qo
1
-2
2
-3
1
-3
4
-6
Wire
(mm
f)
REF.
10.7MHz
100
―
12
―
0.12 UEW
Sumida electric Co., ltd.
2153
-4095-189
or equivalent
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