TDA7492P

Applications information

Doc ID 15068 Rev 5

19/26

6.2

Gain setting

The gain of the TDA7492P 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

Ω (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 23. For Ci = 470 nF the high-pass filter cutoff frequency is below 20 Hz:

fc = 1 / (2 *

π * Ri * Ci)

Figure 23.

Device input circuit and frequency response

Table 7.

Gain settings

GAIN0

GAIN1

00

21.6

01

27.6

10

31.1

11

33.6

Ri

Input

Ci

Rf

Input

pin

signal