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參數(shù)資料
| 型號： | 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315MHz的無線收發(fā)器 |
| 文件頁數(shù)： | 48/88頁 |
| 文件大?。?/td> | 2086K |
| 代理商： | TDA5251F1 |
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TDA5251 F1
Version 1.0
Application
Preliminary Specification
48
2003-02-18
Confidential
Choosing C
L
as large as possible results in a small pulling sensitivity. On the other hand a small C
L
keeps the influence of the serial inductance and the tolerances associated to it small (see
formula
[3-17]
).
Start-up Time
where:
-R:
is the negative impedance of the oscillator
see
Figure 3-13
is the sum of all external resistances (e.g. R
1
or any
other resistance that may be present in the circuit,
see
Figure 3-12
R
ext
:
The proportionality of L1 and C1 of the crystal is defined by
formula [3-13]
. For a crystal with a small
C1 the start -up time will also be slower. Typically the lower the value of the crystal frequency, the
lower the C1.
A short
conclusion
regarding crystal and crystal oscillator dependencies is shown in the following
table:
The crystal oscillator in the TDA5251 is a NIC (negative impedance converter) oscillator type. The
input impedance of this oscillator is a negative impedance in series to an inductance. Therefore the
load capacitance of the crystal C
L
(specified by the crystal supplier) is transformed to the
capacitance C
v
as shown in
formula [3-17].
Table 3-1
Crystal and crystal oscilator dependency
Result
Independent variable
C1 >
C0 >
frequency of quartz >
LOSC >
CL >
Relative Tolerance Maximum Deviation
>>
<
>>>
>>
>
t
Start-up
<
-
<<
-
-
>>
<
>
>
<
2
0
1
C
2
′
L
L
S
S
L
C
C
C
f
f
C
D
[3 – 15]
ext
Start
R
R
L
t
1
~
[3 – 16]
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| TDA5251F1_07 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ASK/FSK 315MHz Wireless Transceiver |
| TDA5251XUMA1 | 制造商:Infineon Technologies AG 功能描述:RF Transceiver ASK/FSK 2.5V/3.3V/5V T/R 制造商:Infineon Technologies AG 功能描述:CONTROL - Tape and Reel 制造商:Infineon Technologies AG 功能描述:TXRX FSK/ASK SGL LP TSSOP-38 |
| TDA5252 | 功能描述:射頻接收器 ASK/FSK WIRELESS TRANSCEIVER RoHS:否 制造商:Skyworks Solutions, Inc. 類型:GPS Receiver 封裝 / 箱體:QFN-24 工作頻率:4.092 MHz 工作電源電壓:3.3 V 封裝:Reel |
| TDA5252G2 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ASK/FSK 915MHz Wireless Transceiver |
| TDA5252XUMA1 | 制造商:Infineon Technologies AG 功能描述:RF Transceiver ASK/FSK 2.5V/3.3V/5V 38-Pin TSSOP T/R 制造商:Infineon Technologies AG 功能描述:CONTROL - Tape and Reel 制造商:Infineon Technologies AG 功能描述:TXRX FSK/ASK SGL LP TSSOP-38 |
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