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,
The input has to be between 1V and supply minus 1V. So w/ 4V, the inputs have to stay between
1V and 3V. The output swings almost rail to rail with three state output pulses. It's not really
an op amp, but a class D audio amp. For the inputs, see "Input capacitor selection" on page 12
of the rev. A data sheet.
Thank you for the quick reply.
I saw in the datasheet that Vcm range is (Vdd-1) - 1 - (2V with a 4V rail).
As an "audio" amp, I was wondering if Vp-signal is assumed to be about 0.5V:
@ Vcm = 3V, I could go as high as 3.5V +/-
@ Vcm = 1V, I could go as low as 2.5V +/-
I am spoiled by opamps with rail to rail inputs and didn't want to leave any input range on the table. :-)
Vcm = 1/2 rail, Vp-signal = 1V it is.
I don't understand your comments.
The input voltage range says you have to stay one volt away from either rail.
There is a fixed gain of 18 dB, so if you swing rail to rail, you would overload the part.
What are you trying to build?? Driving a speaker? Headphones?
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.
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.
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