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Application hints
LPR5150AL
8/12
Doc ID 15814 Rev 2
4
Application hints
Figure 3.
LPR5150AL electrical connections and external component values
Power supply decoupling capacitors (100 nF ceramic or polyester + 10 F Aluminum)
should be placed as near as possible to the device (common design practice).
The LPR5150AL allows band limiting the output rate response through the use of an
external low pass filter (suggested) and/or high pass filter (optional) in addition to the
embedded low pass filter (ft = 140Hz).
4xOUTX and 4xOUTY are respectively OUTX and OUTY amplified outputs lines, internally
buffered to ensure low output impedance.
If external high pass or low pass filtering is not applied it is mandatory to short-circuit
respectively pad 4 to pad 5 and pad 9 to pad 10 when amplified outputs are used.
When only non-amplified outputs are used (OUTX/Y), it is suggested to set pads 5 and 9 to
fixed reference voltage (GND/Vref).
When high pass filter is applied to not amplified output (OUTx), it is recommended to buffer
the line before entering ADC for performance optimization.
The LPR5150AL IC includes a PLL (phase locked loop) circuit to synchronize driving and
sensing interfaces. Capacitors and resistors must be added at FILTVDD and VCONT pins
(as shown in
Figure 3) to implement a low-pass filter.
100 nF
10kOhm
470nF
Vdd
GND
HP
Vref
4xOUTY
C2
R1
C1
GND
10 F
GND
Recomended
Low-pass filter
LPR5150AL
(Top View)
1
16
14
13
9
8
6
5
10nF
PD
ST
GND
Vref
4x
OU
T
X
Optional
High-pass filter
Vref
GND
Typical values:
C1
R1
C2
R2
C1
R1
C2
R2
R1 = 1MOhm
C1 = 4.7 F
R2 = 33kOhm
C2 = 2.2 nF to 2.2 F
Not amplified
(TOP VIEW)
DIRECTION OF THE
DETECTABLE
ANGULAR RATES
filtered output Y
Not amplified
filtered output X
+
Y
+
X
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