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參數(shù)資料
| 型號： | RI-RFM-006A-00 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TIRIS RF-Module IC for Automotive |
| 中文描述： | 提里斯射頻集成電路模塊汽車 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大小： | 148K |
| 代理商： | RI-RFM-006A-00 |
Rev. 3.5
RI-RFM-006A
TIRIS
RF-Module IC for Automotive
Page 14 of 19
!
Typical Transmitter Circuit Configuration
This RF-module IC is provided with “TXHI” and “TXLO” terminals which can drive external MOSFETs
for driving the LC serial resonance antenna circuit. This resonance antenna circuit is to send 134.2-kHz
signals to the remote
TIRIS
transponder. Use these terminals as illustrated below.
In this circuit configuration, by selecting a value for R1 within a range of several hundred ohms and in
accordance with the characteristics of MOSFETs (T1 and T2) and introducing the selected value, the
through current which is consumed by the MOSFETs themselves during transmission can be reduced. If
the value for R1 is too high, the on-state resistances of T1 and T2 become very high and they will have
difficulty in driving the LC resonance circuit, leading to a possible reduction of available data
communication distance. Therefore, it is recommended that the value for R1 be defined after careful
evaluation of the characteristics of T1 and T2.
L1 and C1 in the LC resonance circuit may be mutually exchanged in position without giving significant
adverse effects to the operating performance of the circuit. However, the connection as is as illustrated
above is most preferable since it reduces potential influence of high-voltage transmission signals
produced at C1 on T1 and T2, thus a higher efficiency is gained.
RI45538NS
To receiving circuit
R1
7
TXLO
8
TXHI
LC resonance circuit
GND
VCC
134.2KHz
C1
L1
T1
T2
Antenna
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