TDA7493 STMicroelectronics, TDA7493 Datasheet - Page 18

• 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
5.8.1
18/30
Single-ended input application
To use the device with a single-ended source, one input is AC connected to ground (via a
capacitor) and the other input is connected to the audio source. This is designed as a fully
differential input. The input scheme is shown in
However, to avoid the start-up pop noise, it is important to equalize, as much as possible,
the charging currents in the positive and negative inputs. Any imbalance in these charging
currents will be amplified and result in the familiar turn-on pop.
Figure 12. Single-ended input application
Since the input charging currents in the circuit of
add two resistors, R0, as shown in the circuit of
branches of the differential input are better balanced and this can lead to the elimination of
the turn-on pop noise.
Figure 13. Anti-pop configuration for single-ended input application
GND
OUTP
GND
OUTP
Doc ID 14570 Rev 5
R0
Cin
Cin
cin
cin
R0
INN
Cin
Cin
INP
Figure
Figure
Figure 12
INN
INP
13. In this way the currents in the two
12.
Rin
Rin
can be different it is necessary to
TDA7493
Input stage
Rin
Rin
+
Rfb
Rfb
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-
Input stage
+
Rfb
Rfb
-
TDA7493