TDA7493 STMicroelectronics, TDA7493 Datasheet - Page 15

• 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

TDA7493
5.5
Note:
Internal clock and external clock
The clock of the class-D amplifier can be generated internally or it can be synchronous with
the external clock. If two or more class-D amplifiers are used in the same system, it is better
to have all devices working at the same frequency. This is realized by using one TDA7493
as clock master and the others as slaves. All SYNCLK pins are connected together as
shown in
In master mode or with a single TDA7493, the output switching frequency is controlled by
the resistor connected to pin ROSC. The switching frequency is:
where R
In this configuration pin SYNCLK is an output whose frequency is also determined by R
R
In slave mode, pin ROSC can be floating to force pin SYNCLK as input in order to accept the
master clock. The switching frequency in this mode is:
Table 9.
Figure 8.
Master
Slave
OSC
f
f
f
SW
SYNCLK
SW
should be lower than 60 k
OSC
= 10
= f
Figure
SYNCLK
Mode
Master and slave mode
Master and slave modes
is in kΩ and f
= 10
100 nF
6
C
/ (R
OSC
8.
6
OSC
/ (R
/ 2
OSC
* 64 + 840)
ROSC
SW
* 32 + 420) = 2 * f
TDA7493
Master
is in kHz.
Doc ID 14570 Rev 5
Floating
R
R
Ω
39 kΩ
OSC
SYNCLK
OSC
in master mode to avoid operating in error mode.
< 60 kΩ
Output
Pin ROSC
SW
Input
SYNCLK
Output
Input
TDA7493
Application information
Slave
Pin SYNCLK
ROSC
15/30
OSC
: