LISY300ALTR datasheet(9/13 Pages) STMICROELECTRONICS

9 / 13 page

LISY300AL

Application hints

9/13

Application hints

Figure 3.

LISY300AL electrical connections and external components values

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

should be placed as near as possible to the device (common design practice).

The LISY300AL allows to band limit the output rate response through the use of two first-

order on-chip filters: a switched capacitor low-pass filter, with 400Hz -3dB bandwidth, in

combination with an active low-pass filter. The active filter -3 dB nominal frequency (ftA) is

set through an internal resistor RACT and the external capacitor CACT (added between

CACT pin #5 and ANALOG OUTPUT pin #6), by the formula:

The value of the internal resistor RACT is 180 kΩ, while the external capacitor CACT is used to

select the signal bandwidth. The sensed frequency range spans from DC up to the selected

bandwidth.

In order to further reduce high-frequency noise, the LISY300AL supports an additional

optional low-pass filter on ANALOG OUTPUT pin #6 (Figure 3). The cutoff frequency (ftP) is

given by the formula:

100 nF

9.5kOhm

450nF

9nF

0.4nF

VDD

9 10 11 12 13 14

GND

LISY300AL

(top view)

CLOAD

CACT

GND

10 µF

GND

COPT

ROPT

Optional

Low-pass filter

Digital signals

VoutYAW

+Ω

π R

ACT

⋅⋅

---------------------------------------------------

π R

OPT

⋅⋅

----------------------------------------------------

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