tda5235 Infineon Technologies Corporation, tda5235 Datasheet - Page 21

• Manufacturer Part Number: tda5235
• Description: Enhanced Sensitivity Double-configuration Receiver With Digital Baseband Processing
• Manufacturer: Infineon Technologies Corporation

Figure 5
For applications which demand very high selectivity and/or channel separation even two
CER filters may be used. Also in applications where one configuration/channel requires
a wider bandwidth than the other (e.g. TPMS and RKE) the second filter can be by-
passed.
Figure 6
Data Sheet
Input
Input
RX
RX
LNA
LNA
1
Q-Mix
Q-Mix
1
I-Mix
I-Mix
st
st
LO
LO
Double Down Conversion (DDC) with one external filter
Double Down Conversion (DDC) with two external filters
Attenuation
Attenuation
adjust
adjust
IF
IF
10.7 MHz
10.7 MHz
CER-
CER-
Filter
Filter
IF1
IF1
10.7 MHz
Filter IF1
optional
CER-
21
2
2
Mix2
Mix2
nd
Mix2
Mix2
nd
Q-
Q-
I-
I-
LO
LO
Bandwidth select
Channel Filter
Bandwidth select
Channel Filter
Functional Description
RSSI Generator
RSSI Generator
V1.0, 2010-02-19
harm sup
harm sup
alias sup
alias sup
LP
LP
LP
LP
TDA5235
FSK Demod
FSK Demod
ASK /
ASK /
RSSI
RSSI
ADC
ADC
Divider
Divider
digital
digital
: N
: N
FSK Data
ASK Data
FSK Data
ASK Data
RX
RX
RX
RX