lis3l02as STMicroelectronics, lis3l02as Datasheet - Page 4

• Manufacturer Part Number: lis3l02as
• Description: Inertial Sensor 3axis - 2g/6g Linear Accelerometer
• Manufacturer: STMicroelectronics

LIS3L02AS
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-
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C
C
C
C
C
C
C
C
C
pr
ps1
ps2
pr
pr
ps1
ps2
ps1
ps2
C
C
C
C
C
C
s1x
s2x
s1y
s2y
s1z
s2z
R
R
R
R
R
R
R
R
R
s1
r
s2
s1
r
s2
s1
r
s2
S2x
S1x
S2y
S2z
S1y
S1z
rot