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參數(shù)資料
| 型號： | TA2123AF |
| 廠商： | Toshiba Corporation |
| 英文描述： | 1.5V Stereo Headphone Amplifier |
| 中文描述： | 1.5V的立體聲耳機放大器 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 427K |
| 代理商： | TA2123AF |
TA2123AF
2002-10-30
13
3. Total
(1) Ripple filter
It is necessary to connect a low saturation transistor (2SA1362 etc.) for ripple filter, because this IC
doesn’t have transistor for ripple filter. Care should be taken to stabilize the ripple filter circuit, because
the ripple filter circuit supplies internal circuit except power drive stage with power source.
(2) Switch terminal
(a) PW SW
It is necessary to connect an external pull down resistor with terminal PW SW, in case that this IC is
turned on due to external noise etc. (The PW SW sensitivity is designed highly.)
(b) MT SW, BST SW, F / R SW, PRE SW, M / N SW
The current flows through terminals of MT SW, BST SW, PRE SW and M / N SW, in case that these
terminals are connected with V
CC
line independently, even though the PW SW is off mode. It is
necessary to connect an external pull down resistor with each terminals in case that IC is turned on
due to external noise etc. These switches are designed highly.)
The pop noise at turning on / off MT SW can be reduced by the external capacitor of the MT TC
terminal.
(c) C AMP SW
The C AMP SW terminal should not be connected with high voltage of V
CC
etc., because internal
circuit is broken.
(d) Sensitivity voltage of each switch (Ta = 25°C)
(1) MT SW,F / R SW,PRE SW,PW SW
MT SW (V
41
) F / R SW (V
44
) PRE SW (V
45
)
PW SW (V
42
)
'H'
Muting OFF
REV mode
Preamp. OFF
IC ON
'L'
Muting ON
FWD mode
Preamp. ON
IC OFF
BST SW (V
43
) M / N SW (V
46
)
'H', open
BST ON
Metal mode
'L'
BST OFF
Normal mode
Supply voltage (V)
T
4
4
4
4
2.5
0
2
1.5
1
0.5
1
1.5
2
2.5
2.2V
0.8V
0.3V
H
L
(2) BST SW,M / N SW
Supply voltage (V)
T
4
V
4
2.5
0
2
1.5
1
0.5
1
1.5
2
2.5
2.2V
0.8V
0.3V
H
L
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