TDA5211XT Infineon Technologies, TDA5211XT Datasheet - Page 29

• Manufacturer Part Number: TDA5211XT
• Manufacturer: Infineon Technologies

Specifications of TDA5211XT

• Operating Temperature (min): -40C
• 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

Wireless Components
This offset voltage is generated by the bias current of the negative input of the
comparator (i.e. 20nA) running over the external resistor R. This voltage raises
the voltage appearing at pin 20 (e.g. 1mV with R = 100k ). In order to obtain
benefit of this asymmetrical offset for the demodulation of long zeros the lower
of the two FSK frequencies should be chosen in the transmitter as the zero-
symbol frequency.
In the following figure the shape of the above mentioned bandpass is shown.
Figure 4-8
The cutoff frequencies are calculated with the following formulas:
f
Example:
R = 100k
This leads tof
3
is the 3dB cutoff frequency of the data filter - see Section 4.2.
C = 47nF
Frequency characterstic in case of FSK mode
v -3dB
1
gain (pin19)
0dB
3dB
= 44Hz and f
v
DC
0.18m V/k Hz
4 - 9
f1
20dB/dec
f
2
1
= 485Hz
f
2
2
f
v
3
f2
R
R
2m V/k Hz
f
1
330
f
330
1
3
dB
11 f
k
k
1
C
f3
Specification, May 2001
-40dB/dec
Applications
TDA 5211
frequenzgang.WMF
f