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TDA7498 Datasheet(PDF) 21 Page - STMicroelectronics

No. de pieza TDA7498
Descripción Electrónicos  100-watt 100-watt dual BTL class-D audio amplifier
PDF  28 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7498 Datasheet(HTML) 21 Page - STMicroelectronics

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TDA7498
Applications information
Doc ID 16107 Rev 8
21/28
4.3
Gain setting
The gain of the TDA7498 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.
4.4
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 22. For Ci = 470 nF the high-pass filter cutoff frequency is below 20 Hz:
fC = 1 / (2 * π * Ri * Ci)
Figure 22.
Input circuit and frequency response
Table 8.
Gain settings
GAIN0
GAIN1
Nominal gain, Gv (dB)
LL
25.6
LH
31.6
HL
35.6
HH
37.6
Ri
Input
Ci
Rf
Input
pin
signal



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