TDA5251F1 Datasheet, PDF (55/88 Pages) Infineon Technologies AG – ASK/FSK 315MHz Wireless Transceiver

TDA5251 F1
Version 1.0
Confidential
Application
The default mode is bipolar switch with no ramp function (D0 = 1, D1 = D2 = 0), which is suitable
for all bitrates.
Table 3-3 Sub Address 0EH: XTAL_CONFIG
D0 D1 D2
Switch mode
0 n.a. n.a.
FET
1
0
0
bipolar (default)
1
1
0
bipolar
1
0
1
bipolar
1
1
1
bipolar
Ramp time
< 0.2 ms
< 0.2 ms
4 ms
8 ms
12 ms
Max. Bitrate
> 32 kBit/s NRZ
> 32 kBit/s NRZ
32 kBit/s NRZ
16 kBit/s NRZ
12 kBit/s NRZ
3.2.6 Finetuning and FSK modulation relevant registers
Case FSK-RX or ASK-TX (C_tune2):
Table 3-4
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
(Ctune2)
Default
0
1
0
0
1
0
Case FSK-TX or ASK-RX (C_tune1 and C_tune2):
Table 3-5
Bit
D13
D12
D11
D10
D9
D8
D5
D4
D3
D2
D1
D0
Sub Address 01H: FSK
Function
FSK+5
FSK+4
FSK+3
FSK+2
FSK+1
FSK+0
FSK-5
FSK-4
FSK-3
FSK-2
FSK-1
FSK-0
Value
8pF
4pF
2pF
1pF
500fF
250fF
4pF
2pF
1pF
500fF
250fF
125fF
Description
Setting for
positive
frequency
shift: +FSK
or ASK-RX
(Ctune2)
Setting for
negative
frequency
shift: -FSK
(Ctune1)
Default
0
0
1
0
1
0
0
0
1
1
0
0
Preliminary Specification
55
2003-02-18