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Class D Switching Power Amplifiers and Power D/A conversion

Gain Select on TPA3001
Gain Select on TPA3001
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Old 3rd April 2005, 03:18 PM   #1
soundNERD is offline soundNERD  United States
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Join Date: Sep 2003
Location: Illinois
Default Gain Select on TPA3001

How does the gain select on the schematic for this part work? Can I use a resistor, or is it something else? The schematic is in this pdf file on page 14:

http://focus.ti.com/lit/ds/symlink/tpa3001d1.pdf

Thanks
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Old 3rd April 2005, 06:48 PM   #2
Jaka Racman is offline Jaka Racman  Slovenia
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Join Date: Dec 2002
Location: Slovenia
Hi,

from the datasheet it seems that Gain1 and Gain2 are TTL compatible logic inputs (5.5V max input voltage). You can change gain in 4 discrete steps as explained in Table1 on page 20. For low input level simply connect input to gnd, for high input level connect input to Vref (pin23).

Best regards,

Jaka Racman
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