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参数资料
| 型号： | MAX2511EEI+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC TXRX IF W/RSSI&LIMIT 28-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 频率： | 200MHz ~ 440MHz |
| 功率 - 输出： | -2dBm |
| 电源电压： | 2.7 V ~ 5.5 V |
| 电流 - 接收： | 24mA |
| 电流 - 传输： | 26mA |
| 数据接口： | PCB，表面贴装 |
| 天线连接器： | PCB，表面贴装 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 28-QSOP |
| 包装： | 带卷 (TR) |
Low-Voltage IF Transceiver
with Limiter and RSSI
Filter Sharing
In half-duplex or TDD applications, the number of exter-
nal filters can be minimized by combining transmit and
receive filter paths (Figure 5).
______________________Layout Issues
A well-designed PC board is an essential part of an RF
circuit. For best performance, pay attention to power-
supply issues, as well as the layout of the matching net-
The 10.7MHz filter that is usually connected to the
TXIN, TXIN ports can be the same filter that is connect-
ed at LIMOUT and LIMOUT . To use the same filter, con-
works and tank circuit.
Power-Supply Layout
nect TXIN to LIMOUT, and TXIN to LIMOUT .
The 425MHz SAW filter needed at the RXIN, RXIN ports
and the filter needed at TXOUT and TXOUT can be
shared in a similar manner. The RXIN, RXIN ports must
be DC blocked to prevent the bias voltage needed by
the TXOUT and TXOUT pins from entering the receiver.
When sharing filters in this manner, the transmitter out-
put port (TXOUT, TXOUT ) and receiver input port (RXIN,
RXIN ) matching networks must be modified. The receiv-
er port’s input impedance must be the parallel combi-
nation of the receiver and transmitter ports in Rx mode.
In this case, the receiver port is active, but the transmit-
ter port adds an additional parasitic impedance. See
the transmitter and receiver-port impedance graphs in
the Typical Operating Characteristics.
When the part is in transmit mode, the RXIN and RXIN
inputs provide back termination for the TXOUT and
TXOUT outputs so that a single IF filter can be connect-
ed (Figure 5). With this technique, the matching network
can be adjusted so the input VSWR is less than 1.5:1 in
Rx mode, and the output VSWR is less than 2:1 in Tx
mode.
Receive IF Filter
The interstage 10.7MHz filter, located between the
MIXOUT pin and the LIMIN pin, is not shared. This filter
prevents the limiter from acting on any undesired sig-
nals that are present at the mixer’s output, such as LO
feedthrough, out-of-band channel leakage, and other
mixer products. This filter is also set up to pass DC bias
voltage from the the V REF pin into the LIMIN and
MIXOUT pins through two filter-termination resistors
(330 ? —see the Typical Operating Circuit for more
information). If the filter can provide a DC shunt path,
such as a transformer-capacitor based filter or some L-C
filters, the two resistors can be combined into one par-
allel, equivalent resistor (165 ? ) to reduce component
count (Figure 5—inset).
For minimizing coupling between different sections of the
chip, the ideal power-supply layout is a star configura-
tion, which has a heavily decoupled central V CC node.
The V CC traces branch out from this node, each going to
one V CC node on the MAX2511. At the end of each of
these traces is a bypass capacitor that is good at the
RF frequency of interest. This arrangement provides
local decoupling at each V CC pin. At high frequency,
any signal leaking from a supply pin sees a relatively
high impedance (formed by the V CC trace impedance)
to the central V CC node, and an even higher imped-
ance to any other supply pin.
Place the VREF decoupling capacitor (0.1μF typ) as
close to the MAX2511 as possible for best interstage fil-
ter performance. Use a high-quality, low-ESR capacitor
for best results.
Matching Network Layout
The TXOUT, TXOUT port requires a bias network that
consists of two inductors to V CC (for differential drive)
and optionally a back-termination resistor for matching
to an external filter. The RXIN, RXIN port also needs an
impedance-matching network. Both networks should be
symmetrical and as close to the chip as possible. See
the Typical Operating Circuit for more details. If you use
a ground-plane PC board, cut out the ground plane
under the matching network components to reduce
parasitic capacitance.
Local-Oscillator Tank Layout
Oscillator-tank circuit layout is critical. Parasitic PC
board capacitance, as well as trace inductance, can
affect oscillation frequency. Keep the tank layout sym-
metrical, tightly packed, and as close to the device as
possible. If a ground-plane PC board is used, the
ground plane should be cut out under the oscillator
components to reduce parasitic capacitance.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX2511EVKIT | 功能描述:射频开发工具 MAX2511 Eval Kit 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 |
| MAX2514AWLX#G42 | 制造商:Maxim Integrated Products 功能描述: |
| MAX2514ELX | 功能描述:射频发射器 RoHS:否 制造商:Micrel 类型:ASK Transmitter 封装 / 箱体:SOT-23-6 工作频率:300 MHz to 450 MHz 封装:Reel |
| MAX2514ELX-T | 功能描述:射频发射器 RoHS:否 制造商:Micrel 类型:ASK Transmitter 封装 / 箱体:SOT-23-6 工作频率:300 MHz to 450 MHz 封装:Reel |
| MAX2514EVKIT | 功能描述:射频开发工具 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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