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TDA1905 데이터시트(Datasheet) 10 Page - STMicroelectronics

부품명 TDA1905
상세내용  5W AUDIO AMPLIFIER WITH MUTING
PDF  14 Pages
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제조사  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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10/14
MUTING FUNCTION
The output signal can be inhibited applying a DC voltage VT to pin 4, as shown in fig. 29
Figure 29
The input resistance at pin 5 depends on the threshold voltage VT at pin 4 and is typically :
R5 = 200 K
Ω @ 1.9V ≤ VT ≤ 4.7V
muting-off
R5 =
10
@
0V
≤ VT ≤ 1.3V
muting-on
6V
≤ VT ≤ Vs
Referring to the following input stage, the possible attenuationof the input signal and therefore of the output
signal can be found using the following expression:
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
4 is greater than 150 K
Ω. The muting function can
be usedin many cases, when a temporaryinhibition
of the output signal is requested, for example:
– in switch-on condition, to avoid preamplifier
power-on transients (see fig. 22)
AT
=
Vi
V8
=
Rg
+(
R8 • R5
R8
+ 5
)
(
R8 • R5
R8
+ R5
)
where R8
≅ 100 KΩ
– during switching at the input stages.
– during the receiver tuning.
The variable impedance capability at pin 5 can be
useful in many applications and two examples are
shown in fig. 25 and 27, where it has been used to
change the feedback network, obtaining 2 different
frequency responses.
TDA1905




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