TDA7501 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TDA7501' PDF : 18 Pages View PDF
TDA7501
5
Reference concept
Reference concept
For the input section the TDA7501 generates the internal reference voltage by multiplying
the V33 voltage by 1.2575.
The V33 voltage is also buffered and fed back to the CODEC where it is used to generate all
necessary references. For best performance it is recommended to filter the V33 reference
pin by means of a passive second order lowpass as shown in Figure 13. This concept allows
a direct DC coupling between the TDA7501 and the DSP because of the accurate matching
of DC levels. On the output side the TDA7501 offers two main modes: a single supply and a
dual supply mode.
5.1
Dual supply mode
In this mode the outputs are able to provide up to 4V rms with a minimum supply VCC of 12V
as well as a output reference voltage set to half of VCC (bit D0 of the mode select byte set to
'1').
If the switch D1/byte mode select is open the output reference voltage must be defined
externally e.g. a zener diode with RC lowpass.
If the switch is closed the reference voltage will be half of VCC and only an external capacitor
has to be added.
5.2
Single supply mode
If VCC and Vdd are connected to a single supply the maximum possible output swing is about
2.8V rms .
The output reference voltage pin can be left open or otherwise the internal voltage divider
can be used to generate for the outputs a VCC/2 reference.
Figure 13. Reference voltage generation
TDA7500
TDA7501
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