參數(shù)資料
型號(hào)： TDA5251F1
廠商： INFINEON TECHNOLOGIES AG
英文描述： ASK/FSK 315MHz Wireless Transceiver
中文描述： 詢價(jià)/ FSK信號(hào)315MHz的無(wú)線收發(fā)器
文件頁(yè)數(shù)： 54/88頁(yè)
文件大?。?/td> 2086K
代理商： TDA5251F1
TDA5251 F1
Version 1.0
Application
Preliminary Specification
54
2003-02-18
Confidential
3.2.4
Calculation of the external capacitors
1. Determination of necessary crystal frequency using
formula [3-19].
e.g. f
FSK-
= f
COSC LOW
2. Determine corresponding C
Load
applying
formula [3-18]
.
e.g. C
L FSK
- = C
L ±
3. Necessary C
V
using
formula [3-17]
.
e.g.
1
1. When the necessary C
v
for the 3 frequencies (C
v-
for FSK LOW, C
v+
for FSK HIGH and C
vm
for
FSK-receive) are known the external capacitors and the internal tuning caps can be calculated
using the following formulas:
To compensate frequency errors due to crystal and component tolerance C
v1
, C
v2
and C
v3
have to
be varied. To enable this correction, half of the necessary capacitance variation has to be realized
with the internal C-banks.
If no finetuning is intended it is recommended to leave XIN (Pin 21) open. So the parasitic
capacitance of Pin 21 has no effect.
Note
: Please keep in mind also to include the Pad parasitics of the circuit board.
In the suitable range for the serial capacitor, either capacitors with a tolerance of 0.1pF or 1% are
available.
A spreadsheet, which can be used to predict the total frequency error by simply entering the crystal
specification, may be obtained from Infineon.
3.2.5
FSK-switch modes
The FSK-switch can be used either in a bipolar or in a FET mode. The mode of this switch is
controlled by bit
D0
of the
XTAL_CONFIG
register (subaddress 0EH).
In the bipolar mode the FSK-switch can be controlled by a ramp function. This ramp function is set
by the bits D1 and D2 of the XTAL_CONFIG register (subadress 0EH). With these modes of the
FSK-switch the bandwidth of the FSK spectrum can be influenced.
When working in the FET mode the power consumption can be reduced by about 200 A.
OSC
L
FSK
FSK
L
V
f
C
C
*
2
1
2
,
[3 – 29]
C
v1
C
tune1
+
C
v-
C
C
v1
C
C
v1
C
21
tune1
C
tune1
+
tune1
C
tune1
+
–
=
C
v2
C
tune2
+
C
v+
C
v+
C
vm
C
vm
C
21
C
21
C
21
–
C
21
–
–
–
–
------------+
C
20
–
=
C
v3
C
tune2
+
–
--------------+
C
20
–
C
v2
–
C
22
–
=
-FSK:
+FSK:
FSK_RX:
[3 – 27]
[3 – 28]
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