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參數(shù)資料
| 型號(hào)： | EVB72012 |
| 英文描述： | EVB72012 EValuation Board for TH72012 |
| 中文描述： | EVB72012評(píng)估板TH72012 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 307K |
| 代理商： | EVB72012 |
EVB72001
315MHz FSK Transmitter
Evaluation Board Description
390127200101
Page 6 of 12
EVB Description
Rev. 002
Oct/02
PR
EL
IM
INA
RY
2.7
Mode Control Logic
The mode control logic allows two different
modes of operation as listed in the following
table. The mode control pin ENTX is pulled-
down internally. This guarantees that the whole
circuit is shut down if this pin is left floating.
ENTX
Mode
Description
0
TX standby
TX disabled
1
TX active
TX enable
2.8
Timing Diagrams
After enabling the transmitter by the ENTX signal, the power amplifier remains inactive for the time ton, the
transmitter start-up time. The crystal oscillator starts oscillation and the PLL locks to the desired output
frequency within the time duration ton. After successful PLL lock, the LOCK signal turns on the power
amplifier, and then the RF carrier can be FSK modulated.
Fig. 5: Timing diagram for FSK modulation
For more detailed information, please refer to the latest TH72001 data sheet revision.
RF carrier
low
high
LOCK
FSKDTA
t
low
high
ENTX
t on
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