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TDA1910 데이터시트(PDF) 10 Page - STMicroelectronics |
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TDA1910 데이터시트(HTML) 10 Page - STMicroelectronics |
10 / 15 page 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 Ω @ 1.9V ≤ VT ≤ 4.7V muting-off R1 = 10 Ω @ 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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