LIS3L02AQ3

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be compatible with the external world.

The signals of the sensing element are multiplexed and fed into a low-noise capacitive charge amplifier that im-

plements a Correlated Double Sampling system (CDS) at its output to cancel the offset and the 1/f noise. The

output signal is de-multiplexed and transferred to three different S&Hs, one for each channel and made avail-

able 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 accurate output

waveform.

All the analog parameters (zero-g level, sensitivity and self-test) are ratiometric to the supply voltage. Increasing

or decreasing the supply voltage, the sensitivity and the offset will increase or decrease almost linearly. The self

test voltage change varies cubically with the supply voltage

4.3 Factory calibration

The IC interface is factory calibrated for sensitivity (So) and Zero-g level (Voff).

The trimming values are stored inside the device by a non volatile structure. Any time the device is turned on,

the trimming parameters are downloaded into the registers to be employed during the normal operation. This

allows the user to employ the device without further calibration.

5

Application Hints

Figure 4. LIS3L02AQ3 Electrical Connection

Power supply decoupling capacitors (100nF ceramic or polyester + 10

as possible to the device (common design practice).

The LIS3L02AQ3 allows to band limit Voutx, Vouty and Voutz through the use of external capacitors. The re-

commended frequency range spans from DC up to 1.5 KHz. In particular, capacitors must be added at output

pins to implement low-pass filtering for antialiasing and noise reduction. The equation for the cut-off frequency

res

Vout Z

Vout Y

100nF

Cload z

LIS3L02AQ3

10

µF

Vdd

Vout X

GND

GND

Vdd

GND

1

44

34

33

11

12

22

23

DIRECTION OF THE

DETECTABLE

ACCELERATIONS

Cload x

Cload y

Y

1

X

Z

(top view)

Optional

Optional

Optional

ST

Digital signals

GND

GND