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| 型號(hào)： | TDA1910HS |
| 廠商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 音頻／視頻放大 |
| 英文描述： | 17 W, 1 CHANNEL, AUDIO AMPLIFIER, PZFM11 |
| 封裝： | MULTIWATT-11 |
| 文件頁(yè)數(shù)： | 2/15頁(yè) |
| 文件大?。?/td> | 400K |
| 代理商： | TDA1910HS |
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10/15
MUTING FUNCTION
The output signal can be inhibited applying a DC voltage VT to pin 11, as shown in fig. 28
Figure 28
The input resistance at pin 1 depends on the threshold voltage VT at pin 11 and is typically.
R1 = 200 K
@ 1.9V ≤ VT ≤ 4.7V
muting-off
R1 =
10
@
0V
≤ VT ≤ 1.3V
muting-on
6V
≤ VT ≤ Vs
Referring to the following input stage, the possible attenuation of the input signal and therefore of the output
signal can be found using the following expression.
AT
=
Vi
V5
=
Rg
+ R5 R1
R5
R1
where R5
100 K
Considering Rg = 10 K
the attenuation in the
muting-on condition is typically AT = 60 dB. In the
muting-off condition, the attenuation is very low,
typically 1.2 dB.
A very low current is necessary to drive the thresh-
old voltage VT because the input resistance at pin
11 is greater than 150 K
. The muting function can
be used in many cases, when a temporary inhibition
of the output signal is requested, for example:
- in switch-on condition, to avoid preamplifier
power-on transients (see fig. 27)
- during commutations at the input stages.
- during the receiver tuning.
The variable impedance capability at pin 1 can be
useful in many applications and we have shown 2
examples in fig. 22 and 24, where it has been used
to change the feedback network, obtaining 2 differ-
ent frequency responses.
TDA1910
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