TDA5221 Infineon Technologies, TDA5221 Datasheet - Page 24

• Manufacturer Part Number: TDA5221
• Description: RECEIVER SHR FSK/ASK SGL TSSOP28
• Manufacturer: Infineon Technologies
• Type: Receiverr

Specifications of TDA5221

• Package / Case: 28-TSSOP
• Frequency: 300MHz ~ 340MHz
• Sensitivity: -113dBm
• Data Rate - Maximum: 100 kbps
• Modulation Or Protocol: ASK, FSK
• Applications: RKE, Remote Control Systems
• Current - Receiving: 6.2mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 105°C
• Operating Frequency: 340 MHz
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 4.4mm
• Product Length (mm): 9.7mm
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant
• Other names: SP000014343; TDA5221; TDA5221INTR; TDA5221XT

The time constant T
(see Figure 9) has to be significantly larger than the longest period of no signal change
T
In order to keep distortion low, the minimum value for R is 20k .
T
R1, R
Figure 7
In case of ASK operation another possibility for threshold generation is to use the peak
detector in connection with an internal resistive divider and one capacitor as shown in
the following Figure 8. For selecting the peak detector as reference for the slicing level
a logic low as to be applied on the SSEL pin.
In case of MSEL is high (or open), which means that ASK-Mode is selected, a logic low
on the SSEL pin yields a logic high on the AND-output and thus the peak-detector is
selected (see Figure 9).
In case of FSK the MSEL-pin and furthermore the one input of the AND-gate is low, so
the peak detector can not be selected.
The capacitor value is depending on the coding scheme and the protocol used.
Preliminary Specification
L
A
T
T
and
within the data sequence.
has to be calculated as
A
A
F3 int
R
R
R
1
1
1
, R
(
R
R
R
F4 int
R
1
F
F
Data Slicer Threshold Generation with External R-C Integrator
F
3
3
3
int
R
int
int
and C13 see also Figure 7 and .Figure 9
F
4
data
filter
int
A
R
R
R
of this circuit including also the internal resistors R
F
F
F
4
4
4
int
int
int
)
19
C
C
13
13
20
R
R
1
1
U
24
II
II
threshold
data slicer
(
(
R
R
CM
F
F
3
3
int
int
v
25
R
R
F
F
4
4
int
int
)
)
C
C
13
13
V 1.1, 2004-10-20
F3int
Applications
...
...
TDA 5221
for
for
and R
FSK
ASK
F4int