AN628 APPLICATION NOTE

10/35

VRM(7) = 1.6V

VRM(7) = 5V

Gain at 2f(100Hz)

-80dB

Pin 8. MULT-OUT (Output of the multiplier). This pin deliveres the programming current (Imult) according to the

relation:

To optimize the multiplier biasing for each application, the relation between Imult and the other input signals to

the multiplier are here reported (refer to figure 13 and see figures 13a to 13h).

Figure 13.

I

mult

0.37 I

IAC

V

va

out

–

1.28V

–

() 0.8 V

LFF

1.28V

–

⋅

()

⋅

V

RMS

2

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⋅⋅

=