TDA7492MV 查看數據表（PDF） - STMicroelectronics
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TDA7492MV Datasheet PDF : 26 Pages
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TDA7492MV
Applications information
6.3
Gain setting
The gain of the TDA7492MV 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 8. Gain settings
GAIN0
L
L
L
H
H
L
H
H
GAIN1
Nominal gain, Gv (dB)
21.6
27.6
31.1
33.6
6.4
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 24. For Ci = 470 nF the high-pass filter cut-off frequency is below 20 Hz:
fc = 1 / (2 * π * Ri * Ci)
Figure 24. Device input circuit and frequency response
Rf
Input
signal
Ci
Input Ri
pin
Doc ID 16264 Rev 1
21/26
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