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MAX2830
2.4GHz to 2.5GHz 802.11g/b RF Transceiver, PA,
and Rx/Tx/Antenna Diversity Switch
are on, so that Tx or Rx modes can be quickly enabled
from this mode. Set SHDN to a logic-low and RXTX to a
logic-high to place the device in standby mode.
Receive (Rx) Mode
The complete receive signal path is enabled in this
mode. Set SHDN to logic-high and RXTX to logic-low to
place the device in Rx mode.
Transmit (Tx) Mode
The complete transmitter signal path is enabled in this
mode. Set SHDN and RXTX to logic-high to place the
device in Tx mode.
Rx/Tx Calibration Mode
The MAX2830 features Rx/Tx calibration modes to detect
I/Q imbalances and transmit LO leakage. In the Tx cali-
bration mode, all Tx circuit blocks, except the PA driver
and external PA, are powered on and active. The AM
detector and receiver I and Q channel buffers are also
on, along with multiplexers in the receiver side to route
this AM detector’s signal. In this mode, the LO leakage
calibration is done only for the LO leakage signal that is
present at the center frequency of the channel (i.e., in the
middle of the OFDM or QPSK spectrum). The LO leakage
calibration includes the effect of all DC offsets in the
entire baseband paths of the I/Q modulator and direct
leakage of the LO to the I/Q modulator output.
The LO leakage and sideband detector output are
taken at the receiver I and Q channel outputs during
this calibration phase.
During Tx LO leakage and I/Q imbalance calibration, a
sine and cosine signal (f = f TONE ) is input to the base-
band I/Q Tx pins from the baseband IC. At the LO leak-
age and sideband-detector output, the LO leakage
corresponds to the signal at f TONE and the sideband
suppression corresponds to the signal at 2 x f TONE . The
output power of these signals vary 1dB for 1dB of vari-
ation in the LO leakage and sideband suppression. To
Maxim Integrated
calibrate the Tx path, first set the power-detector gain
to 9dB using D12:D11 in Register 6 (see Table 22).
Adjust the DC offset of the baseband inputs to mini-
mize the signal at f TONE (LO leakage). Then, adjust the
baseband input relative magnitude and phase offsets
to reduce the signal at 2 x f TONE .
In Rx calibration mode, the calibrated Tx RF signal is
internally routed to the Rx inputs. In this mode, the
VCO/LO generator/PLL blocks are powered on and
active except for the low-noise amplifier (LNA).
Applications Information
Layout Issues
The MAX2830 EV kit can be used as a starting point for
layout. For best performance, take into consideration
grounding and RF, baseband, and power-supply routing.
Make connections from vias to the ground plane as short
as possible. Do not connect the device ground pin to the
exposed paddle ground. Keep the buffered clock output
trace as short as possible. Do not share the trace with the
RF input layer, especially on or interlayer or back side of
the board. On the high-impedance ports, keep traces
short to minimize shunt capacitance. EV kit Gerber files
can be requested at www.maxim-ic.com.
Power-Supply Layout
To minimize coupling between different sections of the
IC, a star power-supply routing configuration with a
large decoupling capacitor at a central V CC node is
recommended. The V CC traces branch out from this
node, each going to a separate V CC node in the circuit.
Place a bypass capacitor as close as possible to each
supply pin. This arrangement provides local decoupling
at each V CC pin. Use at least one via per bypass
capacitor for a low-inductance ground connection. Do
not share the capacitor ground vias with any other
branch and the exposed paddle ground.
31
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相关代理商/技术参数
MAX2830SEWU
功能描述:射频收发器
RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
MAX2830SEWU+
功能描述:射频收发器
RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
MAX2831ETM+
功能描述:射频收发器 2.4-2.5GHz 802.11g/b 射频收发器 RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
MAX2831ETM+T
功能描述:射频收发器 2.4-2.5GHz 802.11g/b 射频收发器 RoHS:否 制造商:Atmel 频率范围:2322 MHz to 2527 MHz 最大数据速率:2000 Kbps 调制格式:OQPSK 输出功率:4 dBm 类型: 工作电源电压:1.8 V to 3.6 V 最大工作温度:+ 85 C 接口类型:SPI 封装 / 箱体:QFN-32 封装:Tray
MAX2831EVKIT+
功能描述:WiFi/802.11开发工具 MAX2831 Eval Kit RoHS:否 制造商:Roving Networks 产品:Evaluation Boards 工具用于评估:RN-171 支持协议:802.11 b/g 频率:2.4 GHz 接口类型:UART 工作电源电压:2 V to 16 V
MAX2832ETM+
制造商:Maxim Integrated Products 功能描述:2.4GHZ TO 2.5GHZ, 802.11G RF TRANSCEIVER 制造商:Maxim Integrated Products 功能描述:IC+MAX2832ETM+ - Rail/Tube
MAX2832ETM+CFK
制造商:Maxim Integrated Products 功能描述:2.4GHZ TO 2.5GHZ, 802.11G RF TRANSCEIVERS WITH INTEGRATED PA - Rail/Tube
MAX2832ETM+T
制造商:Maxim Integrated Products 功能描述:2.4GHZ TO 2.5GHZ, 802.11G RF TRANSCEIVER 制造商:Maxim Integrated Products 功能描述:2.4GHZ TO 2.5GHZ, 802.11G RF TRANSCEIVERS WITH INTEGRATED PA - Tape and Reel