TDA5212XT Infineon Technologies, TDA5212XT Datasheet - Page 25
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TDA5212XT
Manufacturer Part Number
TDA5212XT
Description
Manufacturer
Infineon Technologies
Datasheet
1.TDA5212XT.pdf
(49 pages)
Specifications of TDA5212XT
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Operating Temperature Classification
Industrial
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
Wireless Components
4.2 Data Filter Design
Utilising the on-board voltage follower and the two 100kΩ on-chip resistors a
2nd order Sallen-Key low pass data filter can be constructed by adding 2 exter-
nal 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 4-3
with
the quality 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 Butterworth filter a = 1.141, b = 1
and thus Q = 0.71
Example: Butterworth filter with f
1. taken from Tietze/Schenk: Halbleiterschaltungstechnik, Springer Berlin, 1999
C
1
= 450pF, C
Data Filter Design
Pins:
C
2
4 - 4
1
= 225pF
=
100k
R
R
2
2
22
C
Q
Π
1
f
3
3dB
b
dB
100k
Q =
R
= 5kHz and R = 100kΩ:
C
21
2
C
a
b
2
=
4
QR
Π
b
f
Specification, December 2006
19
3
dB
Applications
TDA 5212
Filter_Design.wmf
1
.