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TDA1910 数据表(PDF) 10 Page - STMicroelectronics

部件名 TDA1910
功能描述  10W AUDIO AMPLIFIER WITH MUTING
Download  15 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

TDA1910 数据表(HTML) 10 Page - STMicroelectronics

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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
Ω @ 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 KΩ
Considering Rg = 10 K
Ω 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
Ω. 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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