TDA7491HV データシートの表示（PDF） - STMicroelectronics

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TDA7491HV

20 W + 20 W dual BTL class-D audio amplifier

STMicroelectronics 

TDA7491HV

Application information

7.2

Gain setting

The gain of the TDA7491HV is set by the two inputs, GAIN0 (pin 30) and GAIN1 (pin 31).

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

Table 7.

Gain settings

GAIN0

0

0

1

1

GAIN1

0

1

0

1

Nominal gain, Gv (dB)

20

26

30

32

7.3

Input resistance and capacitance

The input impedance is set by an internal resistor Ri = 60 kΩ (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 25. For Ci = 220 nF the high-pass filter cut-off frequency is below 20 Hz:

fc = 1 / (2 * π * Ri * Ci)

Figure 25. Device input circuit and frequency response

19/26

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