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參數(shù)資料
| 型號： | SSTX4915 |
| 廠商： | Silicon Storage Technology, Inc. |
| 英文描述： | LOW POWER ASK TRANMITTER IC |
| 中文描述： | 低功率ASK TRANMITTER集成電路 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 556K |
| 代理商： | SSTX4915 |
www.SiliconStandard.com 6 of 9
Transmit amplifier chain
A transmit amplifier chain consists of a driver amplifier followed by an open collector output stage. The
open collector TXOUT output (pin 5) requires an external pull-up inductor for bias. This inductor may be
used as part of an L-C matching circuit for transforming the amplifier output impedance to that of an exter-
nal loop antenna. To achieve optimum power-added efficiency, the peak-to-peak RF voltage swing at the
TXOUT pin should be twice the supply voltage. Also, the output amplifier has its own ground pin (VSS) in
order to improve isolation.
The transmitter chain is designed for amplitude-shift-keying/on-off keying (ASK/OOK), with the modula-
tion data provided at the MODIN input (pin 8). When V
MODIN
> 0.7 V, an output signal is transmitted, and
when V
MODIN
<0.7 V, no output signal is transmitted.
Operation modes
The table below summarizes the TX4915’s three operating modes — power-down, PLL-only and transmit,
which are controlled by the TXEN and MODIN inputs.
TXEN
MODIN
Operation
Mode
L
L
Power-down
H
L
PLL-only
H
>
0.7
V
Transmit
Rev.2.0
2
8
/
0
6/2003
SSTX4915
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