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參數(shù)資料
| 型號(hào)： | TA2149BFN |
| 廠商： | Toshiba Corporation |
| 英文描述： | 3 V AM/FM 1 Chip Tuner IC (for Digital Tuning System) |
| 中文描述： | 3伏的AM / FM調(diào)諧器IC 1片（數(shù)字調(diào)諧系統(tǒng)） |
| 文件頁(yè)數(shù)： | 8/15頁(yè) |
| 文件大小： | 243K |
| 代理商： | TA2149BFN |
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TA2149BN/BFN
2001-12-21
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: C
3
by-pass this component.
The cut-off frequency fL is determined by the internal resistance
22 k (Typ.) and the external capacitor C
3
as following;
1
f
3
(Hz)
C
10
22
2
3
L
In the case of the AM Low-Cut function is not needed, set up the value of C
3
over 1 F.
In the condition of C
3
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 V
in
(lim.)
falls a little.)
Turns
Test
Frequency
Co
(pF)
Qo
1-2
2-3
1-3
4-6
Wire
(mm )
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, V
th
0.2 V (Typ.), I
th
30 A (Typ.) AM
V13: OPEN
Stereo/forced monaural switch (pin 14)
V14: Low (Active Low, V
th
= 0.2 V (Typ.), I
th
30 A (Typ.)
V14: OPEN
FM
Forced Monaural
Stereo
V
CE (sat)
14
13
V
CE (sat)
V
CC
3
22 k
22 k
R
C
3
3
1
2
4
6
V
CC
Pin 10
10
1
V
CC
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TA2149BN | 3 V AM/FM 1 Chip Tuner IC (for Digital Tuning System) |
| TA2151FN | RF Amplifier for Digital Servo CD System |
| TA2153FN | RF Amplifier for Digital Servo CD System |
| TA2154AFN | 1.5 V 1 Chip Tuner IC (for Digital Tuning System) |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TA2149BN | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:3 V AM/FM 1 Chip Tuner IC (for Digital Tuning System) |
| TA2149N | 制造商:Panasonic Industrial Company 功能描述:TUNER |
| TA2151FN | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:RF Amplifier for Digital Servo CD System |
| TA2152FLG | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Low Current Consumption Headphone Amplifier (for 1.5-V/3-V Use) |
| TA2152FNG | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Low Current Consumption Headphone Amplifier (for 1.5-V/3-V Use) |
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