tda5251f1 Infineon Technologies Corporation, tda5251f1 Datasheet - Page 59

• Manufacturer Part Number: tda5251f1
• Description: Ask/fsk 315mhz Wireless Transceiver
• Manufacturer: Infineon Technologies Corporation

Confidential
Table 3-10
3.5
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.
Figure 3-20
Preliminary Specification
D7
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Q- Filter
I- Filter
C
Limiter and RSSI
c
3dB cutoff frequencies Data Filter
D6
Limiter and Pinning
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
38
f g
f g
37
C
c
D5
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
36
35
C
D4
c
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
34
Limiter
Limiter
Q
I
33
59
C
c
32
nominal f
31
Quadr.
Quadr.
7 (default)
Corr.
Corr.
C
RSSI
102
11
14
18
23
28
32
39
49
55
64
73
86
-3dB
5
9
in kHz
SUM
29
RSSI
TDA5251 F1
Version 1.0
Application
37k
2003-02-18
limiter input.wmf