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參數資料
| 型號： | T5754 |
| 廠商： | Atmel Corp. |
| 英文描述： | UHF ASK/FSK TRANSMITTER |
| 中文描述： | 超高頻ASK / FSK發(fā)射器 |
| 文件頁數： | 4/13頁 |
| 文件大小： | 215K |
| 代理商： | T5754 |
4
T5754
4511F–RKE–07/04
Functional
Description
If ENABLE = L and the PA_ENABLE = L, the circuit is in standby mode consuming only
a very small amount of current so that a lithium cell used as power supply can work for
several years.
With ENABLE = H the XTO, PLL and the CLK driver are switched on. If PA_ENABLE
remains L only the PLL and the XTO is running and the CLK signal is delivered to the
microcontroller. The VCO locks to 32 times the XTO frequency.
With ENABLE = H and PA_ENABLE = H the PLL, XTO, CLK driver and the power
amplifier are on. With PA_ENABLE the power amplifier can be switched on and off,
which is used to perform the ASK modulation.
ASK Transmission
The T5754 is activated by ENABLE = H. PA_ENABLE must remain L for t
≥
1 ms, then
the CLK signal can be taken to clock the microcontroller and the output power can be
modulated by means of Pin PA_ENABLE. After transmission PA_ENABLE is switched
to L and the microcontroller switches back to internal clocking. The T5754 is switched
back to standby mode with ENABLE = L.
FSK Transmission
The T5754 is activated by ENABLE = H. PA_ENABLE must remain L for t
≥
1 ms, then
the CLK signal can be taken to clock the microcontroller and the power amplifier is
switched on with PA_ENABLE = H. The chip is then ready for FSK modulation. The
microcontroller starts to switch on and off the capacitor between the XTAL load capaci-
tor and GND with an open-drain output port, thus changing the reference frequency of
the PLL. If the switch is closed, the output frequency is lower than if the switch is open.
After transmission PA_ENABLE is switched to L and the microcontroller switches back
to internal clocking. The T5754 is switched back to standby mode with ENABLE = L.
The accuracy of the frequency deviation with XTAL pulling method is about ±25% when
the following tolerances are considered.
Figure 4.
Tolerances of Frequency Modulation
Using C
4
= 9.2 pF ± 2%, C
5
= 6.8 pF ± 5%, a switch port with C
Switch
= 3 pF ± 10%, stray
capacitances on each side of the crystal of C
Stray1
= C
Stray2
= 1 pF ± 10%, a parallel
capacitance of the crystal of C
0
= 3.2 pF ± 10% and a crystal with C
M
= 13 fF ± 10%, an
FSK deviation of ±21 kHz typical with worst case tolerances of ±16.3 kHz to ±28.8 kHz
results.
CLK Output
An output CLK signal is provided for a connected microcontroller, the delivered signal is
CMOS compatible if the load capacitance is lower than 10 pF.
Clock Pulse Take-over
The clock of the crystal oscillator can be used for clocking the microcontroller. Atmel’s
ATARx9x has the special feature of starting with an integrated RC-oscillator to switch on
the T5754 with ENABLE = H, and after 1 ms to assume the clock signal of the transmis-
sion IC, so that the message can be sent with crystal accuracy.
~
~
V
S
XTAL
C
Stray1
C
M
L
M
R
S
C
0
C
Stray2
C
4
C
5
Crystal equivalent circuit
C
Switch
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相關代理商/技術參數 |
參數描述 |
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| T5754_07 | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:UHF ASK/FSK Transmitter |
| T5754-6AP | 功能描述:IC TRANSMITTER 429-439MHZ 8TSSOP RoHS:否 類別:RF/IF 和 RFID >> RF 發(fā)射器 系列:- 標準包裝:4,000 系列:- 頻率:310MHz ~ 440MHz 應用:- 調制或協議:UHF，ASK 數據傳輸率 - 最大:20 kBaud 功率 - 輸出:1dBm ~ 5dBm 電流 - 傳輸:10mA 數據接口:PCB，表面貼裝 天線連接器:PCB，表面貼裝 存儲容量:- 特點:- 電源電壓:2.2 V ~ 4 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-LSSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| T5754-6APJ | 功能描述:射頻發(fā)射器 ASK/FSK Transmitter 429 - 439 MHz RoHS:否 制造商:Micrel 類型:ASK Transmitter 封裝 / 箱體:SOT-23-6 工作頻率:300 MHz to 450 MHz 封裝:Reel |
| T5754-6APJ 71 | 制造商:Atmel Corporation 功能描述: |
| T5754-6AQ | 功能描述:IC TX 429-439MHZ ASK/FSK 8TSSOP RoHS:否 類別:RF/IF 和 RFID >> RF 發(fā)射器 系列:- 標準包裝:4,000 系列:- 頻率:310MHz ~ 440MHz 應用:- 調制或協議:UHF，ASK 數據傳輸率 - 最大:20 kBaud 功率 - 輸出:1dBm ~ 5dBm 電流 - 傳輸:10mA 數據接口:PCB，表面貼裝 天線連接器:PCB，表面貼裝 存儲容量:- 特點:- 電源電壓:2.2 V ~ 4 V 工作溫度:-40°C ~ 85°C 封裝/外殼:16-LSSOP（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
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