LIS3L02AS 查看數據表（PDF） - STMicroelectronics

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LIS3L02AS

INERTIAL SENSOR: 3Axis - 2g/6g LINEAR ACCELEROMETER

STMicroelectronics 

LIS3L02AS

Figure 1. Equivalent electrical circuit

Cps1

Rs1

S1x

Cs1x

Cpr

Rr

Cps2

Cps1

Cs2x

Rs2

Rs1

S2x

S1y

Cs1y

Cpr

Rr

rot

Cs2y

Cps2

S2y

Rs2

Cps1

Cpr

Rs1

Cs1z

Rr

S1z

Cs2z

Cps2

S2z

Rs2

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-

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