TDA5251 Infineon Technologies, TDA5251 Datasheet - Page 51

• 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

e.g.
with a frequency deviation of 30kHz.
Figure 3-15 shows the configuration of the switches and the capacitors to achieve the 2 desired
frequencies. Gray parts of the schematics indicate inactive parts. For FSK modulation the ASK-
switch is always open.
For FSK LOW the FSK-switch is closed and C
by:
For finetuning C tune1 can be varied over a range of 8 pF in steps of 125fF. The switches of this C-
bank are controlled by the bits D0 to D5 in the FSK register (subaddress 01H, see Table 3-6).
For FSK HIGH the FSK-switch is open. So the effective C
The C-bank C tune2 can be varied over a range of 16 pF in steps of 250fF for finetuning of the FSK
HIGH frequency. The switches of this C-bank are controlled by the bits D8 to D13 in the FSK
register (subaddress 01H, see Table 3-6).
Figure 3-15
Data Sheet
C
C
C
C v+
V
V1
V2
−
f
f
COSC HI
COSC LOW
=
=
C
f, C
C
(
-------------------------------------------------------------------------------------- -
V3
C
C v1
v
L
1
v1
FSK modulation
XSWA 22
XOUT 19
XSWF 20
XGND 23
+
+
XIN 21
+
C
C
C tune1
tune1
tune
= (315E6 + 30E3) / 24= 13.12625MHz
= (315E6 - 30E3) / 24= 13.12375MHz
FSK LOW
1
)
+
⋅
L
(
C v2
C
v2
+
+
C tune2
C
C
C
-R
tune2
tune1
tune2
)
v2
51
and C
C
C
V1
V2
tune2
C
f, C
v+
V3
are bypassed. The effective C
L
is given by:
XSWA 22
XOUT 19
XSWF 20
XGND 23
XIN 21
FSK HIGH
[3 – 20]
[3 – 21]
L
C
C
-R
tune2
tune1
TDA5251 F1
Version 1.1
Application
2007-02-26
QOSC_FSK.wmf
v-
is given