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參數(shù)資料
| 型號： | TDA5220 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ASK/FSK Single Conversion Receiver |
| 中文描述： | 詢價/ FSK信號單一轉(zhuǎn)換接收器 |
| 文件頁數(shù)： | 26/44頁 |
| 文件大?。?/td> | 719K |
| 代理商： | TDA5220 |
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Applications
4 - 6
TDA 5220
preliminary
Wireless Components
confidential
Target Specification, October 2001
4.4 Quartz Frequency Calculation
As described in Section 3.4.3 the operating range of the on-chip VCO is 820 to
860 MHz with a nominal center frequency of 840MHz. This signal is divided by
2 before applied to the mixer in case of operation at 434 MHz. This local oscil-
lator signal can be used to downconvert the RF signals both with high- or low-
side injection at the mixer. The resulting receive frequency ranges then extend
between 810 and 870MHz or between 400 and 440MHz. Low-side injection of
the local oscillator has to be used for receive frequencies between 840 and
870MHz as well as high-side injection for receive frequencies below 840MHz.
Corresponding to that in the 400MHz region low-side injection is applicable for
receive frequencies above 420MHz, high-side injection below this frequency.
Therefore for operation both in the 868 and the 434 MHz ISM bands low-side
injection of the local oscillator has to be used. Then the local oscillator fre-
quency is calculated by subtracting the IF frequency (10.7 MHz) from the RF
frequency (434 or 868 MHz). Please note that no sign-inversion occurs in case
of reception and demodulation of FSK-modulated signals.
The overall division ratios in the PLL is 64 in case of operation at 868 MHz or
32 in case of operation at 434 MHz. The quartz frequency in case of low-side
injection may be calculated by using the following formula:
QU
= (
RF
-
10.7) / r
with
RF
LO
QU
r
receive frequency
local oscillator (PLL) frequency (
RF
-
10.7)
quartz oscillator frequency
ratio of local oscillator (PLL) frequency and quartz frequency as
shown in the subsequent table
:
Table 4-1 Dependence of PLL Overall Division Ratio on FSEL
FSEL
Ratio r = (f
LO
/f
QU
)
32
open
GND
64
(
(
)
MHz
MHz
MHz
f
40156
.
13
64
/
7
10
4
868
QU
=
=
)
MHz
MHz
MHz
f
23437
.
13
32
/
10
2
434
QU
=
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA5220T | 制造商:Infineon Technologies AG 功能描述:RKE RX RECIEVER, TSSOP-28, 3K |
| TDA5220XUMA1 | 制造商:Infineon Technologies AG 功能描述:RF Receiver ASK/FSK 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:RECEIVER SHR FSK/ASK SGL TSSOP28 |
| TDA5221 | 功能描述:射頻接收器 ASK/FSK SNGL Convrsn Receiver 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 |
| TDA5221INCT-ND | 制造商:Infineon Technologies AG 功能描述: |
| TDA5221XUMA1 | 制造商:Infineon Technologies AG 功能描述:RF Receiver ASK/FSK 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:RECEIVER SHR FSK/ASK SGL TSSOP28 |
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