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參數(shù)資料
| 型號： | T5744-TKQ |
| 廠商： | ATMEL CORP |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | UHF ASK Receiver |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO20 |
| 封裝： | SSO-20 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大小： | 277K |
| 代理商： | T5744-TKQ |
8
T5744
4521B–RKE–01/03
Receiving
Characteristics
The RF receiver T5744 can be operated with and without a SAW front-end filter. In a
typical automotive application, a SAW filter is used to achieve better selectivity. The
selectivity with and without a SAW front-end filter is illustrated in Figure 7. Note that the
mirror frequency is reduced by 40 dB. The plots are printed relatively to the maximum
sensitivity. If a SAW filter is used, an insertion loss of about 4 dB must be considered.
When designing the system in terms of receiving bandwidth, the LO deviation must be
considered as it also determines the IF center frequency. The total LO deviation is cal-
culated to be the sum of the deviation of the crystal and the XTO deviation of the T5744.
Low-cost crystals are specified to be within ±100 ppm. The XTO deviation of the T5744
is an additional deviation due to the XTO circuit. This deviation is specified to be
±30 ppm. If a crystal of ±100 ppm is used, the total deviation is ±130 ppm in that case.
Note that the receiving bandwidth and the IF-filter bandwidth are equivalent.
Figure 8.
Receiving Frequency Response
Basic Clock Cycle of the
Digital Circuitry
The complete timing of the digital circuitry and the analog filtering is derived from one
clock. According to Figure 9, this clock cycle TClk is derived from the crystal oscillator
(XTO) in combination with a divider. The division factor is controlled by the logical state
at Pin MODE. According to chapter 'RF Front End', the frequency of the crystal oscillator
(f
XTO
) is defined by the RF input signal (f
RFin
) which also defines the operating frequency
of the local oscillator (f
LO
).
Figure 9.
Generation of the Basic Clock Cycle
-100.0
-80.0
-60.0
-40.0
-20.0
0.0
-6.0
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
df (MHz)
d
without SAW
with SAW
DVCC
XTO
MODE
T
f
16
15
14
Clk
XTO
XTO
Divider
:14/:10
L : USA(:10)
H: Europe(:14)
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|---|---|
| T5744-TKS | UHF ASK Receiver |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T5744-TKS | 功能描述:射頻收發(fā)器 UHF ASK Receiver IC RoHS:否 制造商:Atmel 頻率范圍:2322 MHz to 2527 MHz 最大數(shù)據(jù)速率:2000 Kbps 調(diào)制格式:OQPSK 輸出功率:4 dBm 類型: 工作電源電壓:1.8 V to 3.6 V 最大工作溫度:+ 85 C 接口類型:SPI 封裝 / 箱體:QFN-32 封裝:Tray |
| T5746 | 功能描述:手工工具 SEPARATOR TOOL RoHS:否 制造商:Molex 產(chǎn)品:Extraction Tools 類型: 描述/功能:Extraction tool |
| T5746F | 制造商:Harwin 功能描述:SEPARATOR TOOL 制造商:Harwin 功能描述:SEPARATOR TOOL; SVHC:No SVHC (19-Dec-2012); Series:Datamate L-Tek, J-Tek & Mix-Tek ;RoHS Compliant: NA |
| T5747 | 功能描述:折皺器 POSITIONER RoHS:否 制造商:Hirose Connector 類型: 描述/功能:Cable and Shield Crimper |
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