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| 型号： | MAX9947ETE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/17页 |
| 文件大小： | 0K |
| 描述： | TXRX AISG INTEGRATED 16TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 频率： | 2.176MHz |
| 数据传输率 - 最大： | 115.2kbps |
| 调制或协议： | OOK |
| 应用： | AISG |
| 功率 - 输出： | 12dBm |
| 电源电压： | 3 V ~ 5.5 V |
| 数据接口： | PCB，表面贴装 |
| 存储容量： | * |
| 天线连接器： | PCB，表面贴装 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
AISG Integrated Transceiver
Detailed Description
The MAX9947 is an AISG-compliant, fully integrated
transceiver.
The MAX9947 transmitter includes an OOK modulator, a
bandpass filter that is compliant with the AISG spectrum
emission profile, and an output amplifier. The output
power can be varied with external resistors from +7dBm
to +12dBm (+1dBm to +6dBm at the feeder cable) to
compensate for loss in the external circuitry and cabling.
The OOK carrier is generated by applying an external
crystal at 8.704MHz to the OOK internal modulator
through the XTAL1 and XTAL2 pins. An external clock
source at the same frequency can also be applied to
XTAL1 by connecting XTAL2 to ground.
The MAX9947 receiver includes a narrow 200kHz band-
width bandpass filter that operates around the 2.176MHz
center frequency. It also includes an OOK demodulator
and a comparator that reconstruct the digital signal. The
minimum sensitivity of the receiver is -15dBm (typ) in
compliance with the AISG standard specifications.
The MAX9947 also features a direction output to facilitate
the RS-485 bus arbitration in tower-mounted equipment.
Direction Output
The MAX9947 provides a direction output pin (DIR) that
indicates the direction of the data flow. This feature is
very useful in the tower that acts as a slave in the AISG
protocol. The base is the master and it controls the flow of
the data by performing the bus arbitration. The output DIR
allows the equipment in the tower to avoid any involvement
in the bus arbitration. See the Typical Application Circuit
(Connectivity at the Tower) that shows how the MAX9947
can be used in the tower in conjunction with the RS-485
transceiver such as the MAX13485E or MAX13486E.
The output DIR drives the DE (driver output enable) and
RE_ (receiver output enable) of the RS-485 transceiver.
Whenever the data flows from RXIN to RXOUT, the out-
put DIR is asserted high. When the MAX9947 is located
in the tower, the data flow is being sent from the base
(master) to the tower (slave). On the other side, when the
data flows in the opposite direction, from TXIN to TXOUT
the output DIR is asserted low. However, the MAX9947
internal state machine is sensing both the TXIN and RXIN
lines, and can recognize the correct flow of data and
avoid asserting the DIR high.
Figures 1 and 2 show the timing diagrams of the DIR
functionality. When the data flows from RXIN to RXOUT,
DIR remains high for 16 bit-times after the last logic-level
low bit within the 8-bit protocol data. This is compliant
with the AISG specification saying that the RS-485 trans-
mitter stops driving the bus within 20 bit-times after the
last stop bit is sent.
The input pins DIRMD2 and DIRMD1 define the duration
of the bit time, as shown in Table 1.
TXIN
IDLE (LOGIC-LEVEL HIGH)
RXIN
IDLE
STOP BIT
IDLE
RXOUT
IDLE
START BIT
BIT0 = 1
BIT1 = 1
BIT2 = 0
BIT3 = 0
BIT4 = 1
BIT5 = 1
BIT6 = 0
BIT7 = 0 STOP BIT
t RX
DIR = 1
DIR = 1 FOR OTHER 16 BIT-TIMES
DIR
t DIR, SKEW
Figure 1. The MAX9947 on the Tower: Communication Flow is from the Base to the Tower
10
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| MAX9947EVKIT+ | 功能描述:射频开发工具 MAX9947EVKIT+ RoHS:否 制造商:Taiyo Yuden 产品:Wireless Modules 类型:Wireless Audio 工具用于评估:WYSAAVDX7 频率: 工作电源电压:3.4 V to 5.5 V |
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