TDA5220XT Infineon Technologies, TDA5220XT Datasheet - Page 21

• Manufacturer Part Number: TDA5220XT
• Manufacturer: Infineon Technologies

Specifications of TDA5220XT

• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Automotive
• Product Depth (mm): 4.4mm
• Product Length (mm): 9.7mm
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / Rohs Status: Compliant

3.2
Utilising the on-board voltage follower and the two 100k on-chip resistors a 2nd order
Sallen-Key low pass data filter can be constructed by adding 2 external capacitors
between pins 19 (SLP) and 22 (FFB) and to pin 21 (OPP) as depicted in the following
figure and described in the following formulas
Figure 5
with R
with
Q is the qualify factor of the poles where, in case of a Bessel filter a=1.3617, b=0.618
and thus Q=0.577
and in case of a Butter worth filter a=1.414, b=1
and thus Q=0.71
Example: Butter worth filter with f
C14=450pF, C12=225pF
1) taken from Tietze/Schenk: Halbleiterschaltungstechnik, Springer Berlin, 1999
Preliminary Specification
F1int
=R
Data Filter Design
F2int
Data Filter Design
=R
R
100k
F1 int
C
FFB
C14
14
22
3dB
R
2
2
Q
=5kHz and R=100k
R
100k
f
F2 int
3
b
dB
Q
OPP
C12
21
C
12
a
1)
b
21
.
4
QR
b
f
3
dB
SLP
19
V 1.1, 2004-10-20
Applications
TDA 5220