TDA2003 Input sensitivity

chenbeyound · ‎2016-10-19

Posted on October 19, 2016 at 10:41

I found from the TDA2003 spec.that the input sensitivity is 55mv ( P0=6W,RL=4), what will happen if increasing the amplitute of input signal? And I want to control volume of amplifier , should I control the amplitute of input signal from 0 to 55mV ? Can the gain of TDA2003 be changed?

#audio-amplifier

Nickname1623_O · ‎2016-10-19

Posted on October 20, 2016 at 02:56

hi ,

when input level is higher than 55mV , output will be clipped .

the gain is adjustable by external feedback network , please refer to datasheet .

but max input level is 330mV when you chose 26dB gain.

Thanks

YT

chenbeyound · ‎2016-10-19

Posted on October 20, 2016 at 05:42

thanks for your answer. I found no gain adjustment from the datasheet.maybe the datasheet I have is not completed. Could you send me a full version?

Nickname1623_O · ‎2016-10-20

Posted on October 20, 2016 at 09:05

hi Allen,

the link of datasheet is below

http://www.st.com/content/ccc/resource/technical/document/datasheet/43/57/41/42/e4/e8/43/42/CD00000123.pdf/files/CD00000123.pdf/jcr:content/translations/en.CD00000123.pdf

and refer to test circuitry in first page, you can see the voltage feed back network R1 and R2, the gain is equal to (R1+R2)/R2. with same value in test circuitry , the gain is around 40dB ( 100 times ), you can change it refer to table in page 8. and the minimum gain is 26dB .

Thanks

YT