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参数资料
| 型号： | TA8155FG |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2 CHANNEL, AUDIO PREAMPLIFIER, PDSO24 |
| 封装： | 0.300 INCH, 1 MM PITCH, PLASTIC, SSOP-24 |
| 文件页数： | 13/17页 |
| 文件大小： | 1452K |
| 代理商： | TA8155FG |
TA8155FG/FNG
2004-10-12
5
Application Note
(1) PW SW
It is necessary to connect an external pulldown resistor with the terminal PW SW (pin(12)), in case that this IC
is turned on due to external noise etc.
(2) Mode SW
Table.1 IC mode
IC mode is determined by switch condition
of RED SW (pin(11)) and LINE SW (pin(15))
(Table.1)
H level: Bias current should be applied
to switch terminal more than 5A.
L level: Bias voltage should be applied to
switch terminal from 0V to 0.3V.
The leak current flows through the terminal of REC SW (pin(11)) or LINE SW (pin(15)), in case that the
terminals connected with VCC line independently, even though this IC is offmode (the terminal of PW SW
(pin(12)) is offmode).
And it is necessary to connect an external pulldown resistor with the terminal REC SW (pin(11)) and LINE SW
(pin(15)), in case that this IC is turned on due to external noise etc.
(3) Playback amplifier
Output voltage of playback amplifier is determined by an external resistor R1 and Rf.
VO (PRE) = VREFVRf
)
(
B(NF)
I
1
R
V
V is an offset voltage which is designed to 18mV.
In case that β of transistor is assumed 100, IB(NF) is flowed 0.2A in Fig.1. And output voltage of playback
amplifier (pin (8),(9)) in Fig.1 is
VO (PRE) = 0.85V0.018V (330k+13k)
x
0.56(V)
A
0.2
-
18k
0.018V
=
)
(
Output voltage of playback amplifier should be fixed VCC / 2,
because playback amplifier get a enough dynamic range.
And current source of 20A is operated except playback
mode, in order to reduce a pop sound in
swichover between playback on / off mode (Fig.2).
REC SW
LINE SW
L
H
L
PB mode
(PB)
MIC
REC
(BUF,MIC,REC)
H
Radio mode
(BUF)
Radio
REC mode
(BUF,REC)
( ) : Operating amplifier.
Fig.1 DC output voltage of
playback amplifier.
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相关代理商/技术参数 |
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|---|---|
| TA8155FN | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:REC/PB SYSTEM DUAL PRE-AMPLIFIER (1.5/3V USE) |
| TA8155FNG | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:REC / PB System Dual Pre−amplifier (1.5 / 3V USE) |
| TA8157AF | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:STEREO HEADPHONE POWER AMPLIFIER (1.5V USE) |
| TA8158F | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:FM FRONT END IC |
| TA8159FN | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:1.5V STEREO HEADPHONE AMPLIFIER |
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