TDA5251XT Infineon Technologies, TDA5251XT Datasheet - Page 52
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TDA5251XT
Manufacturer Part Number
TDA5251XT
Description
Manufacturer
Infineon Technologies
Datasheet
1.TDA5251XT.pdf
(88 pages)
Specifications of TDA5251XT
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
Compliant
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In receive mode the crystal oscillator frequency is set to yield a direct-to-zero conversion of the
receive data. Thus the frequency may be calculated as
e.g.
which is identical to the ASK transmit case.
Figure 3-16
In this case the ASK-switch is closed. The necessary C
The C-bank C
receive frequency. In this case the switches of the C-bank are controlled by the bits D0 to D5 of the
XTAL_TUNING register (subaddress 02H, see Table 3-5).
3.2.2.2
In transmit mode the crystal oscillator frequency is the same as in the FSK receive case, see
Figure 3-16.
In receive mode a receive frequency offset is necessary as the limiters feedback is AC-coupled.
This offset is achieved by setting the oscillator frequency to the FSK HIGH transmit frequency, see
Figure 3-15.
Data Sheet
C
ASK-mode:
f
f
tune2
COSC
COSC
vm
FSK receive
=
can be varied over a range of 16 pF in steps of 250fF for finetuning of the FSK
= f
= 315E6 / 24= 13.123MHz
(
------------------------------------------------------------------------------------------------------- -
C
C v1
v1
RF
+
+
/ 24,
C
C tune1
tune1
C
C
V1
V2
)
C
+
f, C
⋅
V3
(
C v2
C
L
v2
XSWA 22
XOUT 19
XSWF 20
XGND 23
XIN 21
+
+
C
C
v3
v3
+
+
C tune2
C
52
tune2
L
)
vm
-R
is given by:
C
C
tune2
tune1
[3 – 22]
[3 – 23]
TDA5251 F1
Version 1.1
Application
2007-02-26
QOSC_ASK.wmf
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