TDA5250D2_07 Datasheet, PDF (62/94 Pages) Infineon Technologies AG – ASK/FSK 868MHz Wireless Transceiver

TDA5250 D2
Version 1.7
Application
Table 3-10
D7
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
3dB cutoff frequencies Data Filter
D6
D5
D4
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
nominal f_-3dB in kHz
5
7 (default)
9
11
14
18
23
28
32
39
49
55
64
73
86
102
3.5
Limiter and RSSI
The I/Q Limiters are DC coupled multistage amplifiers with offset-compensating feedback circuit
and an overall gain of approximately 80dB each in the frequency range of 100Hz up to 350kHz.
Receive Signal Strength Indicator (RSSI) generators are included in both limiters which produce DC
voltages that are directly proportional to the input signal level in the respective channels. The
resulting I- and Q-channel RSSI-signals are summed to the nominal RSSI signal.
C_c
38
C_c
37 36
C_c
35 34
C_c
33 32
C
RSSI
31
29 RSSI
I- Filter
fg
Q- Filter
fg
I
Limiter
Q
Limiter
Figure 3-22 Limiter and Pinning
Data Sheet
62
Quadr.
Corr.
Quadr.
Corr.
37k
Σ
limiter input.wmf
2007-02-26