tda7498l STMicroelectronics, tda7498l Datasheet - Page 20

• Manufacturer Part Number: tda7498l
• Description: 80 W + 80 W Dual Btl Class-d Audio Amplifier
• Manufacturer: STMicroelectronics

Applications information
5.3
5.4
20/27
Gain setting
The gain of the TDA7498L 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.
Table 8.
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
Figure 23. Input circuit and frequency response
L
L
H
H
fc = 1 / (2 * π * Ri * Ci)
23. For Ci = 470 nF the high-pass filter cut-off frequency is below 20 Hz:
GAIN0
Gain settings
Input
signal
Ci
Doc ID 16504 Rev 1
L
H
L
H
Input
pin
Ri
GAIN1
Rf
25.6
31.6
35.6
37.6
Nominal gain, G
TDA7498L
v
(dB)