Application hints LPR4150AL
10/14 Doc ID 16576 Rev 1
5 Application hints
Figure 3. LPR4150AL 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 LPR4150AL allows band limiting of the output rate response through the use of an
external low-pass filter (recommended) in addition to the embedded low-pass filter
(f
t
= 140 Hz).
4xOUTX and 4xOUTY are, respectively, OUTX and OUTY amplified output lines, internally
buffered to ensure low output impedance.
If external low-pass filtering is not applied, it is mandatory to short-circuit pin 1 to pin 5 and
pin 16 to pin 20, respectively, when amplified outputs are used.
When only a non-amplified output is used (OUTX/OUTZ), it is recommended to set pin 5
and 16 to a fixed reference voltage (Vref).
The LPR4150AL IC includes a PLL (phase-locked loop) circuit to synchronize driving and
sensing interfaces. Capacitors and resistors must be added at the FILTVDD and VCONT
pins (as shown in Figure 3) to implement a low-pass filter.
N&
6DD
'.$
#
2
#
'.$
&
$IGITALSIGNALS
'.$
6REF
4YPICALVALUES
2-/HM
#U&
'.$
&),46$$
X/549
&),4).9
&),4/549/549
.#
4OP6IEW
X/548
.#
.#
(0
2ES
34
0$
.#
.#
.#
.#
.#
&),46$$
.#
.#
.#
.#
6#/.4
&),46$$
6#/.4
6DD
,02!,
4/06)%7
$)2%#
4)/./&4(%
$%4%#4!",%
!.'5,!22!4%3
2K/HM
#U&
#N&
:
Y
:
X
6REF '.$
#
2
#
2
2K/HM
#N&TOU&
6REF'.$
2ECOMENDED
,OWPASSFILTER
/PTIONAL
(IGH
PASSFILTER
#
2
#
2
.OTAMPLIFIED
FILTEREDOUTPUT8
.OTAMPLIFIED
FILTEREDOUTPUT9
!-V
