TS472 datasheet(17/24 Pages) STMICROELECTRONICS

部件名	TS472

功能描述	Very low noise microphone preamplifier with 2.0V bias output and active low standby mode

PDF	24 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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17 / 24 page

TS472

Application information

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Figure 37 below gives other values of the gain vs. voltage applied on GS pin.

Figure 37.

Gain vs. gain select voltage

5.6

Wake-up time

When the standby is released to put the device ON, a signal appears on the output a few

microseconds later, and the bypass capacitor Cb is charged in a few milliseconds. As Cb is

directly linked to the bias of the amplifier, the bias will not work properly until the Cb voltage

is correct.

In the typical application, when a biased microphone is connected to the differential input via

the input capacitors (Cin), (and the output signal is in line with the specification), the wake-up

time will depend upon the values of the input capacitors Cin and the gain. When gain is

lower than 0dB, the wake-up time is determined only by the bypass capacitor Cb, as

described above. For a gain superior to 0dB, see Figure 38 below.

Figure 38.

Wake-up time in the typical application vs. input capacitors

0.2

0.4

0.6

0.8

-80

-60

-40

-20

Tamb=25

°C

(V)

100

Gain=20dB

Tamb = 25°C

Vcc=3V

Cb=1

μF

Input capacitors C

(nF)

Maximum Gain

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