LIS3L02AS

4/7

Figure 1. Equivalent electrical circuit

1.2 IC Interface

The complete signal processing uses a fully differential structure, while the final stage converts the differ-

ential signal into a single-ended one to be compatible with the external world.

The first stage is a low-noise capacitive amplifier that implements a Correlated Double Sampling (CDS) at

its output to cancel the offset and the 1/f noise. The produced signal is then sent to three different S&Hs,

one for each channel, and made available to the outside.

The low noise input amplifier operates at 200 kHz while the three S&Hs operate at a sampling frequency

of 66 kHz. This allows a large oversampling ratio, which leads to in-band noise reduction and to an accu-

rate output waveform.

All the analog parameters (output offset voltage and sensitivity) are ratiometric to the voltage supply. In-

S1x

rot

S2x

S1y

S2y

S1z

S2z