TDA5251F1 Datasheet, PDF (59/88 Pages) Infineon Technologies AG – ASK/FSK 315MHz Wireless Transceiver

Confidential
TDA5251 F1
Version 1.0
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
C_c
38 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 3-20 Limiter and Pinning
Preliminary Specification
59
Quadr.
Corr.
Quadr.
Corr.
37k
SUM
limiter input.wmf
2003-02-18