TDA7493 STMicroelectronics, TDA7493 Datasheet - Page 12

• Manufacturer Part Number: TDA7493
• Description: Audio Amplifiers 3W + 3W Dual BTL Class-D 4-Select dB
• Manufacturer: STMicroelectronics

Specifications of TDA7493

• Amplifier Class: D
• No. Of Channels: 2
• Output Power: 3W
• Supply Voltage Range: 3V To 5.5V
• Thd + N: 0.05% @ 0.5W, 4ohm, VCC=5V
• Load Impedance: 4ohm
• Operating Temperature Range: 0°C To +70°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application information
5.3
12/30
Input resistance and capacitance
The input impedance is set by an internal resistor, Ri, of value 60 kΩ. An input coupling
capacitor (Ci) is required on each input line. These two components together form a
high-pass filter whose cutoff frequency is:
Figure 4.
The value of Ci is chosen depending on the application and the speaker system. For a
cut-off frequency less than 20 Hz, the input capacitors could be 470 nF each.
If a polarized capacitor is used, it is important to connect the positive side of the capacitor to
the terminal with higher DC voltage. The DC voltage on the input pins is V
Figure 5.
f
C
= 1 / (2 * π * Ri * Ci)
Input signal
Input high-pass RC filter
Device input structure
Ci
Ci
Doc ID 14570 Rev 5
Ri
Ri
+
-
Rf
Rf
CC
/ 2.
TDA7493