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参数资料
| 型号： | TA8187AFNG |
| 元件分类： | 接收器 |
| 英文描述： | FM, AUDIO DEMODULATOR, PDSO16 |
| 封装： | 0.225 INCH, 0.65 MM PITCH, PLASTIC, SSOP-16 |
| 文件页数： | 6/11页 |
| 文件大小： | 869K |
| 代理商： | TA8187AFNG |
TA8187AFNG
2004-10-12
4
Application Note
1. Mode SW (pin(3))
It is necessary to connect an external pulldown resistor with the
terminal of mode SW (pin(3)), in case that this IC mode doesn’t
operate normally due to external noise etc.
Reducing a pop sound
It is advised to connect R1, R2 and C with the terminal of mode SW
(pin(3)), to reduce a pop sound is switchover between single IF mode
and dual IF mode (see Fig.1).
It is better that the constants are R1≒R2≒100k, C≒1F at
VCC = 1.2V. As for the constants, select the optimum one
depending on each a set carefully.
Operating amplifier etc. is decided by condition of mode switch.
It is as follows.
Input Terminal
Output Terminal
Operating amp.
IF INA (pin(15))
OUTA (pin(8))
DET OUT (pin(12))
IFA, BUFA
AF
Dual IF mode
IF INB (pin(2))
OUTB (pin(7))
IFB, BUFB
IF INA (pin(15))
DET OUT (pin(12))
IFA, AF
INA (pin(9))
OUTA (pin(8))
BUFA
Single IF mode
INB (pin(10))
OUTB (pin(7))
BUFB
Table 1 Operating amplifier etc. by mode switch condition
2. IF in (pin(2)(15))
External parts (ceramic filter etc.) of IF amplifier should be connected VCC1 terminal with common terminal of
external parts, because IF amplifier circuits operate on VCC1 voltage.
In case that these external parts are connected with GND reference etc., there is a possibility that this circuit
doesn’t operate normally at large signal input.
3. In case that the muting function isn’t used.
In case that the muting function isn’t used, the terminal of MT in (pin(13)) and LPF (pin(16)) should be opened.
In case that these terminal connected with VCC or GND, internal circuit doesn’t operate normally.
It is necessary to connect an external capacitor (C = 0.01F) with the terminal of MT in (pin(13)) and LPF
(pin(16)), in case that the muting function operates due to external noise etc.
4. Input of audio signal
The audio signal should be applied to the terminal of INA (pin(9)) or INB (pin(10)) through a coupling capacitor
because buffer amplifier is operated by VREF.
In case that DC current or DC voltage is applied to the terminal of INA (pin(9)) or INB (pin(10)), the internal
circuit has unbalance and buffer amplifier doesn’t operate normally.
Fig.1 Mode switch circuit
reducing a pop sound
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