TDA5251 Infineon Technologies, TDA5251 Datasheet - Page 53

• Manufacturer Part Number: TDA5251
• Description: TXRX FSK/ASK SGL LP TSSOP-38
• Manufacturer: Infineon Technologies
• Type: Transceiverr

Specifications of TDA5251

• Package / Case: 38-TSSOP
• Frequency: 315MHz
• Data Rate - Maximum: 64kbps
• Modulation Or Protocol: ASK, FSK
• Applications: RKE, Remote Control Systems
• Power - Output: 13dBm
• Sensitivity: -109dBm
• Voltage - Supply: 2.1 V ~ 5.5 V
• Current - Receiving: 9.3mA
• Current - Transmitting: 14mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Operating Frequency: 0.35 MHz
• Operating Supply Voltage: 2.5 V, 3.3 V, 5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 4.4mm
• Product Length (mm): 9.7mm
• Operating Supply Voltage (min): 2.1V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant
• Other names: SP000014554; TDA5251; TDA5251INTR; TDA5251XT

3.2.3
For the correct calculation of the external capacitors the parasitic capacitances of the pins and the
switches (C
Figure 3-17
Table 3-2
With the given parasitics the actual C
Note: Please keep in mind also to include the Pad parasitics of the circuit board.
Data Sheet
C vm
C v+
=
20
Name
Parasitics
C 20
C 21
C 22
, C
(
---------------------------------------------------------------------------------------------------------------------------------------- -
Typical values of parasitic capacitances
C
=
C v1
parasitics of the switching network
v1
21
(
-------------------------------------------------------------------------------------------------------
C
C v1
, C
+
+
v1
C
C tune1
22
tune1
C
+
+
v-
) have to be taken into account.
C
C
C
C tune1
tune1
V1
V2
=
)
+
⋅
C
(
C v2
v1
C
)
C
f, C
+
v2
⋅
V3
+
(
C v2
C
+
L
C
+
v2
C 20
tune1
C
XSWA 22
XOUT 19
XSWF 20
XGND 23
+
20
+
v
XIN 21
C 20
+
can be calculated:
C
+
20
C
+
C
FSK-: 2,8 pF / FSK+&ASK: 2.2pF
v3
+
C
v3
+
21
C
C
+
+
tune2
tune2
C 22
C
53
22
C
22
L
+
+
)
C
+
C
tune2
tune2
C
C 21
4,6 pF
21
Value
1 pF
-R
)
C
+
20
C 21
C
C
tune2
tune1
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TDA5251 F1
Version 1.1
QOSC_parasitics.wmf
Application
2007-02-26