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TDA5251F1 View Datasheet(PDF) - Infineon Technologies

Part Name
Description
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TDA5251F1
Infineon
Infineon Technologies Infineon
TDA5251F1 Datasheet PDF : 88 Pages
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TDA5251 F1
Version 1.1
Application
e.g.
fCOSC HI
= (315E6 + 30E3) / 24= 13.12625MHz
fCOSC LOW = (315E6 - 30E3) / 24= 13.12375MHz
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 Cv2 and Ctune2 are bypassed. The effective Cv- is given
by:
CV = Cv1 + Ctune1
[3 – 20]
For finetuning Ctune1 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 Cv+ is given by:
Cv+ = -(--C-C---v--v--1-1---+--+---C-C---t--tu--u--n-n--e--e-1--1--)--+----(-C--C--v--v--2--2---+-+---C--C---t-t-u-u--n--n--e-e--2-2----)
[3 – 21]
The C-bank Ctune2 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).
XOUT 19
L
f, CL
XIN 21
CV1
XSWF 20
XSWA 22
CV2
CV3
XGND 23
-R
Ctune1
Ctune2
XOUT 19
L
f, CL
XIN 21
CV1
XSWF 20
XSWA 22
CV2
CV3
XGND 23
-R
Ctune1
Ctune2
FSK LOW
Figure 3-15 FSK modulation
Data Sheet
51
FSK HIGH
QOSC_FSK.wmf
2007-02-26
 

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