TDA7492 datasheet(24/32 Pages) STMICROELECTRONICS

Part #	TDA7492

Description	50 W 50 W dual BTL class-D amplifier

PDF	32 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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24 / 32 page

Applications information

TDA7492

24/32

DocID014926 Rev 6

6.2

Gain setting

The gain of the TDA7492 is set by the two inputs, GAIN0 (pin 30) and GAIN1 (pin31).

Internally, the gain is set by changing the feedback resistors of the amplifier.

6.3

Input resistance and capacitance

The input impedance is set by an internal resistor Ri = 60 k

 (typical). An input capacitor

(Ci) is required to couple the AC input signal.

The equivalent circuit and frequency response of the input components are shown in

Figure 31. For Ci = 470 nF the high-pass filter cutoff frequency is below 20 Hz:

fc = 1 / (2 *

 * Ri * Ci)

Figure 31. Device input circuit and frequency response

Table 7. Gain settings

GAIN0

GAIN1

Nominal gain, Gv (dB)

21.6

27.6

31.1

33.6

Input

signal

TDA7492 Datasheet(PDF) 24 Page - STMicroelectronics