參數(shù)資料
型號： T48C862x-Rf-TNQ
廠商： Atmel Corp.
元件分類： 4位微控制器
英文描述： Microcontroller with UHF ASK/FSK Transmitter
中文描述： 微控制器，帶有超高頻ASK / FSK發(fā)射器
文件頁數(shù)： 7/108頁
文件大?。?/td> 1023K
代理商： T48C862X-RF-TNQ
7
T48C862-R4 [Preliminary]
4551C–4BMCU–01/04
Figure 4.
Tolerances of Frequency Modulation
~
V
S
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. the micro-
controller block has the special feature of starting with an integrated RC-oscillator to
switch on the PLL transmitter block with ENABLE = H, and after 1 ms to assume the
clock signal of the transmission IC, so the message can be sent with crystal accuracy.
Output Matching and Power
Setting
The output power is set by the load impedance of the antenna. The maximum output
power is achieved with a load impedance of Z
Load,opt
= (166 + j223)
. There must be a
low resistive path to V
S
to deliver the DC current.
The delivered current pulse of the power amplifier is 9 mA and the maximum output
power is delivered to a resistive load of 465
if the 1.0 pF output capacitance of the
power amplifier is compensated by the load impedance.
An optimum load impedance of:
Z
Load
= 465
|| j/(2
× π
1.0 pF) = (166 + j223)
thus results for the maximum output
power of 7.5 dBm.
The load impedance is defined as the impedance seen from the PLL transmitter block’s
ANT1, ANT2 into the matching network. Do not confuse this large signal load imped-
ance with a small signal input impedance delivered as input characteristic of RF
amplifiers and measured from the application into the IC instead of from the IC into the
application for a power amplifier.
Less output power is achieved by lowering the real parallel part of 465
where the
parallel imaginary part should be kept constant.
Output power measurement can be done with the circuit shown in Figure 5 on page 8.
Note that the component values must be changed to compensate the individual board
parasitics until the PLL transmitter block has the right load impedance
Z
Load,opt
= (166 + j223)
. Also the damping of the cable used to measure the output
power must be calibrated.
~
XTAL
C
Stray1
C
M
L
M
R
S
C
0
C
Stray2
C
4
C
5
Crystal equivalent circuit
C
Switch
相關(guān)PDF資料
PDF描述
T48C862x-Rf-TNS Microcontroller with UHF ASK/FSK Transmitter
T48C893 The multiple times programmable (MTP) version for the MARC4 ROM types
T48C893-TK The multiple times programmable (MTP) version for the MARC4 ROM types
T48C893-TKQ The multiple times programmable (MTP) version for the MARC4 ROM types
T500 DIL 14 PIN SINGLE OUTPUT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
T48C862X-RF-TNS 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Microcontroller with UHF ASK/FSK Transmitter
T48C893 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:The multiple times programmable (MTP) version for the MARC4 ROM types
T48C893-TK 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:The multiple times programmable (MTP) version for the MARC4 ROM types
T48C893-TKQ 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:The multiple times programmable (MTP) version for the MARC4 ROM types
T48D 制造商:WELWYN 制造商全稱:Welwyn Components Limited 功能描述:High Voltage Precision Thick Film Resistors
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