TDA7491P datasheet(31/42 Pages) STMICROELECTRONICS

Il numero della parte	TDA7491P

Spiegazioni elettronici	2 x 10-watt dual BTL class-D audio amplifier

PDF	42 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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31 / 42 page

TDA7491P

Applications information

Doc ID 13540 Rev 6

31/42

5.3

Gain setting

The gain of the TDA7491P 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.

5.4

Input resistance and capacitance

The input impedance is set by an internal resistor Ri = 68 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 42. For Ci = 220 nF the high-pass filter cut-off frequency is below 20 Hz:

fc = 1 / (2 *

π * Ri * Ci)

Figure 42.

Device input circuit and frequency response

Table 7.

Gain settings

Voltage level on pin GAIN0

Voltage level on pin GAIN1

Nominal gain, Gv (dB)

L(1)

Refer to VinL and VinH in Table 5: Electrical specifications on page 11 for the drive levels for L and H

L(1)

Input

signal

TDA7491P Scheda tecnica(PDF) 31 Page - STMicroelectronics