M

#### markp

- Jan 1, 1970

- 0

I'm a little confused by the specs in the MAX9704 class D amplifier

datasheet:

http://pdfserv.maxim-ic.com/en/ds/MAX9703-MAX9704.pdf

Table 2 on page 9 shows that, with a 'gain' setting of 13db with 1.23V rms

input, 15W output power is delivered into 8 ohm load. I can't make this

figure add up! (I assume thie gain is defined as 'voltage gain' which is

actally a power gain figure 6db for doubling of voltage, not 3db). Also

there is a graph showing output power versus load resistance, and this shows

a peak at around 8 ohms - this looks like a classic maximum power transfer

curve, so is there an output impedance to take into account? (it's class D,

so where's the power going?).

Any light shone on this appreciated!

Mark.