TDA5250D2 Datasheet, PDF (62/97 Pages) Infineon Technologies AG – ASK/FSK 868MHz Wireless Transceiver

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TDA 5250 D2
preliminary
Applications
4.2.6 Finetuning and FSK modulation relevant registers
Case FSK-RX or ASK-TX (C_tune2):
Table 4-4
Bit
D5
D4
D3
D2
D1
D0
Sub Address 02H: XTAL_TUNING
Function
Value
Nominal_Frequ_5
8pF
Nominal_Frequ_4
4pF
Nominal_Frequ_3
2pF
Nominal_Frequ_2
1pF
Nominal_Frequ_1
500fF
Nominal_Frequ_0
250fF
Description
Setting for
nominal
frequency
ASK-TX
FSK-RX
(C_tune2)
Default
0
1
0
0
1
0
Case FSK-TX or ASK-RX (C_tune1 and C_tune2):
Table 4-5
Bit
D13
D12
D11
D10
D9
D8
Sub Address 01H: FSK
Function
FSK+5
FSK+4
FSK+3
FSK+2
FSK+1
FSK+0
Value
8pF
4pF
2pF
1pF
500fF
250fF
Description
Setting for
positive
frequency
shift: +FSK
or ASK-RX
(C_tune2)
Default
0
0
1
0
1
0
D5
FSK-5
D4
FSK-4
D3
FSK-3
D2
FSK-2
D1
FSK-1
D0
FSK-0
4pF
0
Setting for
2pF
negative
0
1pF
frequency
shift: -FSK
1
500fF
1
250fF
(C_tune1)
0
125fF
0
Default values
In case of using the evaluation board, the crystal with its typical parameters
(fp=18.08958MHz, C₁=8fF, C₀=2,08pF, C_L=12pF) and external capacitors with
Cv1=4.7pF, Cv2=1.8pF, Cv3=12pF each are used the following default states
are set in the device.
Table 4-6 Default oscillator settings
Operating state
Frequency
ASK-TX / FSK-RX
868.3 MHz
+FSK-TX / ASK-RX
+50 kHz
-FSK-TX
-50 kHz
Wireless Components
4 - 22
Specification, July 2002