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参数资料
| 型号： | TA2149BNG |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDIP24 |
| 封装： | 0.300 INCH, 1.78 MM PITCH, PLASTIC, SDIP-24 |
| 文件页数： | 14/15页 |
| 文件大小： | 242K |
| 代理商： | TA2149BNG |
TA2149BNG/BFNG
2006-04-11
8
Application Note
1.
AM Low-Cut Circuit
The AM Low-Cut action is carried out by the bypass of the high frequency
component of the positive-feedback signal at the AF AMP stage.
The external capacitor: C3 by-pass this component.
The cut-off frequency fL is determined by the internal resistance
22 k (Typ.) and the external capacitor C3 as following;
(Hz)
C
10
22
2
1
f
3
L
×
π
×
=
In the case of the AM Low-Cut function is not needed, set up the value of C3 over 1 F.
In the condition of C3 >= 1 F, the frequency characteristic has flat response at the low frequency.
It is possible to reduce the recovered output level at AM mode, by additional resistance between the pin 3
and GND line.
2.
FM Detection Circuit
For the FM detection circuit, detection 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.)
falls a little.)
Turns
Test
Frequency
Co
(pF)
Qo
1-2
2-3
1-3
4-6
Wire
(mm
φ)
Reference
10.7 MHz
51
45
30
0.08UEW
Toko Co., Ltd.
600BEAS-10018Z
3.
FM/AM switch and forced monaural switch.
FM/AM switchover and stereo/forced monaural switchover are done by pin 13 and pin 14.
FM/AM switch (pin 13)
V13: Low (Active Low, Vth = 0.2 V (Typ.), Ith 30 A (Typ.)→ AM
V13: OPEN
→ FM
Stereo/forced monaural switch (pin 14)
V14: Low (Active Low, Vth = 0.2 V (Typ.), Ith 30 A (Typ.)→ Forced Monaural
V14: OPEN
→ Stereo
VCE (sat)
14
13
VCE (sat)
VCC
3
22 k
22 k
R
C3
3
1
2
4
6
VCC
Pin 10
10
15
P
VCC
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| TA2149BFN | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDSO24 |
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| TA2149FN | AUDIO SINGLE CHIP RECEIVER, PDSO24 |
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| TA2149N | 制造商:Panasonic Industrial Company 功能描述:TUNER |
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