M41T00AUD datasheet(31/42 Pages) STMICROELECTRONICS

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M41T00AUD

Audio section operation

Doc ID 13480 Rev 5

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The other parameter pertains to the gain step size, a relative measurement. It is shown in

Table 16 as 3±1 dB. For any gain setting in Table 7, the next higher (or lower) setting is

guaranteed to be between 2 and 4 dB higher (or lower). For example, even though no upper

and lower limits are shown for GAIN = Ch, it is tested to be at 3±1 dB of the case when

GAIN=Bh, one step below. If GAIN=Bh tests to -0.5 dB, then GAIN=Ch is tested to have an

end-to-end gain of 2.5±1 dB. If GAIN=Bh tests to +0.5 dB, then GAIN=Ch is tested to be

3.5±1 dB.

This applies to all steps except the lowest one (from GAIN=0 to GAIN=1) which is not tested.

In summary, for GAIN=1 to GAIN=Fh, all steps are tested to have a 1dB step size tolerance

of the listed 3 dB step size. The unity gain setting, Bh, will have an end-to-end gain of

0±1dB while the three levels for GAIN=4, 5 and Eh are tested to be within ±2 dB of the

typical gain values listed in Table 7.

7.2

Wake-up time: TWU

When the device powers on, the bypass capacitor CBIAS will not be charged immediately. As

CBIAS is directly linked to the bias of the amplifier, the amplifier will not work properly until

the capacitor is charged. The time to reach this voltage is called the wake-up time or TWU

and is specified in the electrical characteristics, Table 16, for CBIAS = 1 µF.

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