TDA5220XT Infineon Technologies, TDA5220XT Datasheet - Page 28

• 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

3.8
In case the receiver is operated in ASK mode the datapath frequency charactersitic is
dominated by the data filter alone, thus it is lowpass shaped.The cutoff frequency is
determined by the external capacitors C
described in Section 3.2
Figure 11
3.9
In case the data slicer threshold shall be generated with an external RC network as
described in Section 3.5 it is necessary to use large values for the capacitor C attached
to the SLN pin (pin 20) in order to achieve long time constants. This results also from the
fact that the choice of the value for R1 connected between the SLP and SLN pins (pins
19 and 20) is limited by the 330k resistor appearing in parallel to R1 as can be seen in
Figure 9. Apart from this a resistor value of 100k leads to a voltage offset of 1mv at the
comparator input. The resulting startup time constant
In case R1 is chosen to be 100k and C13 is chosen as 47nF this leads to
When the device is turned on this time constant dominates the time necessary for the
device to be able to demodulate data properly. In the powerdown mode the capacitor is
only discharged by leakage currents.
Preliminary Specification
-3dB
0dB
ASK Mode
Principle of the Precharge Circuit
Frequency characteristic in case of ASK mode
1
100
k
||
330
1
k
R
|| 1
47
12
330
28
nF
and C
k
77
14
C
k
13
and the internal 100k resistors as
1
can be calculated with:
47
nF
f3dB
3
6 .
ms
-40dB /dec
V 1.1, 2004-10-20
Applications
TDA 5220
f