SSM2305 Audio Amp Input Range

kschilf on May 29, 2014

Dear Community,

What is the input range on the SSM2305? The single supply is 4V. The signal swings 3Vpp. I appreciate that this is much larger than the normal "audio" signal. :-)

Thanks in advance,

Kevin

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0 kschilf on May 30, 2014 9:53 AM

Hi Harry,

We are on the same page. I was just surprised that the input voltage range is only (Vdd - 1V) to 1V. That would explain the 6dB curves in the datasheet. My pre-caffeine typing this morning (1.0V - 0.5V = 2.5V) probably raised the noise floor.

Operating Point:

Vcm = 1/2Vdd = 2V, Vsignal-p <= 1.0V and gain set at 6db with external resistors.

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To answer your question, the load is a small 3W, 4 ohm speaker.

Thanks,

Kevin
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0 kschilf on May 30, 2014 9:53 AM

Hi Harry,

We are on the same page. I was just surprised that the input voltage range is only (Vdd - 1V) to 1V. That would explain the 6dB curves in the datasheet. My pre-caffeine typing this morning (1.0V - 0.5V = 2.5V) probably raised the noise floor.

Operating Point:

Vcm = 1/2Vdd = 2V, Vsignal-p <= 1.0V and gain set at 6db with external resistors.

-----------------------------------

To answer your question, the load is a small 3W, 4 ohm speaker.

Thanks,

Kevin
Cancel
Up 0 Down

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