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AS3435-EQFP Datasheet(PDF) 11 Page - ams AG |
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AS3435-EQFP Datasheet(HTML) 11 Page - ams AG |
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11 / 102 page  ams Datasheet, Confidential: 2014-Jun-13 [v1-30] AS3415/AS3435 – 11 Detaile d Desc rip t ion This section provides a detailed description of the device related components. Audio Line Input The chip features one stereo line input for music playback. Due to the fact that the line input gain stage operates as an inverting amplifier, with access to the negative input pin and the output pin, the gain can be freely configured. In monitor mode the line inputs can also be muted in order to interrupt the music playback and increase speech intelligibility. Besides setting the gain with a resistor network, it is also possible to do simple EQ functions for sound enhancement. The EQ function can also be used to compensate for low frequency bass losses in ANC headset with a feed-back topology. For feed-forward headsets it can be used for sound enhancement to compensate for example a lack of bass because of physical design constraints of a headset. Line Input Gain Setting The line input gain can be configured with two external resistors, R1 and R2, per channel as shown in Figure 8. The gain can be calculated with the following formula: ...[dB] The resistors R1 and R2 should be in the range from 1kΩ to 100k Ω. If the application requires a gain of +6dB the resistor value can be calculated as follows: For this example, a resistor value for R1 was defined as 10kΩ This +6dB calculation yields a value for R2 of 20kΩ. Detailed Description A Line 20 R 2 R 1 ------ log ⋅ = R 2 R 1 10 A Line 20 ------------ ⋅ 10k Ω 10 6 20 ------ ⋅ 20k Ω == = |
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