TDA5252G2 Datasheet, PDF (57/86 Pages) Infineon Technologies AG – ASK/FSK 915MHz Wireless Transceiver

TDA5252 G2
Version 1.1
Application
suppression of adjacent interference signals, the narrowest possible IQ bandwidth should be
realized (see Section 3.3).
3.3
IQ-Filter
The IQ-Filter should be set to values corresponding to the RF-bandwidth of the received RF signal
via the D1 to D3 bits of the LPF register (subaddress 03H).
Table 3-9
D3
3dB cutoff frequencies I/Q Filter
D2
D1
nominal f_-3dB in kHz
(programmable)
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
not used
350
250
200
150 (default)
100
50
not used
resulting effective
channel
bandwidth in kHz
700
500
400
300
200
100
10
0
- 10
-20
-30
-40
-50
-60
-70
-80
10
10 0
10 0 0
f [ kHz]
Figure 3-17 I/Q Filter Characteristics
50 kHz
10 0 kHz
150 kHz
2 0 0 kHz
2 50 kHz
3 50 kHz
10 0 0 0
iq_filter_curve.wmf
Data Sheet
57
2007-02-26