Maxim公司的MAX41460是具有SPI接口的300MHz–960MHz的幅移鍵控（ASK）和（高斯）頻移鍵控（G）FSK發送器，集成了分數鎖相環（PLL），在315MHz時能向50Ω負載輸出功率高達+13dBm而僅消耗小于8mA（ASK）和12MA（（G）FSK），單電源+1.8V到+3.6V工作，主要用在建筑物自動化和安全，無線傳感器和告警，遙控和無鑰匙門禁系統（PRE/PKE），胎壓檢測系統（TPMS），自動讀表（AMR），車庫門開啟（GDO），無線遙控玩具和物聯網（IoT）。本文介紹了MAX41460主要優勢和特性，框圖和典型應用電路圖以及評估板MAX4146x EVK主要特性，電路圖，材料清和PCB設計圖。

　　The MAX41460 is a UHF sub-GHz ISM/SRD transmitteris designed to transmit On-Off Keying （OOK）， Amplitude-Shift Keying （ASK）， frequency-Shift Keying （FSK）， andGaussian （G）FSK （or 2GFSK） data in the 286MHz to960MHz frequency range. It integrates a fractional phaselocked-loop （PLL） so that a single， low-cost crystal canbe used to generate commonly used world-wide sub-GHz frequencies. The fast response time of the PLL allowsfor frequency-hopping， spread spectrum protocolsfor increased range and security. The only frequency-dependentcomponents required are for the external antenna-matching network.

　　The crystal-based architecture of the MAX41460 providesgreater modulation depth， faster frequency settling，higher tolerance of the transmit frequency， and reducedtemperature dependence.

　　The MAX41460 provides output power up to +13dBm intoa 50Ω load while only drawing 《 8mA for ASK （Manchestercoded） and 《 12mA for （G）FSK transmission at315MHz. The output load can be adjusted to increasepower up to +16dBm， and a PA boost mode can be enabledat frequencies above 850MHz to compensate forlosses. The PA output power can also be controlled usingprogrammable register settings.

　　The MAX41460 features single-supply operationfrom +1.8V to +3.6V. The device has an auto-shutdownfeature to extend battery life and a fast oscillator wake-upon data activity detection. A serial programmable interfacemake the MAX41460 compatible with almost any microcontrolleror code-hopping generator.

　　The MAX41460 is available in a 10-pin TSSOP packageand is specified over the -40℃ to +105℃ extendedtemperature range. The MAX41460 has an ESD ratingof 2.5kV HBM.

　　MAX41460主要優勢和特性：

　　● Low Implementation Cost

　　? Bits-to-RF Single-Wire Operation

　　? Low Bill-of-Materials （BoM）

　　? Uses Single， Low-Cost， 16MHz Crystal

　　? Small 3mm x 3mm TSSOP-10 Package

　　● Increased Range， Data Rates， and Security

　　? Up to +16dBm PA Output Power

　　? Fast Frequency Switching for FHSS/DSSS

　　? Fast-On Oscillator： 《 250μs Startup Time

　　? Up to 200kbps NRZ Data Rate

　　● Extend Battery Life with Low Supply Current

　　? 《 8mA ASK Manchester Coded

　　? 《 12mA （G）FSK or 2GFSK at 315MHz

　　? Selectable Standby and Shutdown Modes

　　? Auto Shutdown at 《 20nA （typ） Current

　　● Ease-of-Use

　　? +1.8V to +3.6V Single-Supply Operation

　　? Fully Programmable with SPI Interface

　　? 400kHz/1MHz I2C Versions Also Available

　　MAX41460應用：

　　● Building Automation and Security

　　● Wireless Sensors and Alarms

　　● Remote and Passive Keyless Entry （RKE/PKE）

　　● Tire Pressure Monitoring Systems （TPMS）

　　● Automatic Meter Reading （AMR）

　　● Garage Door Openers （GDO）

　　● Radio Control Toys

　　● Internet of Things （IoT）

　　圖1.MAX41460簡化框圖

　　圖2.MAX41460典型應用電路圖

　　評估板MAX4146x EVK

　　The MAX4146x evaluation kit （EV kit） contains a single MAX4146x high output power VHF/UHF sub-GHz ISM/ SRD transmitter， designed to transmit Frequency-Shift Keying （FSK）， Gaussian GFSK or Amplitude-Shift Keying （ASK） data in the 286MHz to 960MHz frequency range.

　　The MAX41460 and the MAX41461–MAX41464 evaluation kits operate in conjunction with an external microcontroller （MCU） and Graphical User Interface （GUI） software running on a computer. The MAX41460 uses an SPI interface for internal register configurations while the MAX41461–MAX41464 can use the preset modes or an I2C interface for register programming and control.

　　The MAX41461， MAX41462， MAX41463， and MAX41464 evaluation kits are also designed to operate with a simple， one-pin data interface， alleviating the need to program the part for nominal operation， or other high-level system （PC with GUI software） having to configure the transmitter for operation. These parts allow the user to preset the operating frequencies by part selection and pin configurations. On the evaluation kit， selecting the frequency of operation is as simple as setting two jumpers.

　　The EV kit includes Windows? 7/10-compatible software that provides a simple graphical user interface （GUI） for configuration of all the MAX4146x registers through the SPI or I2C ports. The GUI also controls the on-board PMIC and can act as a data generator， when the MAX32630FTHR Applications Platform is used.

　　評估板MAX4146x EVK主要特性：

　　Evaluates the MAX4146x Family of Sub-1GHz ISM Transmitters

　　Single Input Voltage Supply from 1.8V to 3.6V

　　Direct Interface with a MAX32630FTHR ARM Microcontroller （MCU） Board

　　Available Pmod Hardware Interface

　　Windows 7/10-compatible Software

　　On-Board SPI Interface Control for the MAX41460 and optional I2C Control for the MAX41461–MAX41464

　　GUI Controls for MAX32630FTHR Board PMIC Operation from 1.8V to 3.3V

　　Proven 2-Layer PCB Design

　　Fully Assembled and Tested

　　圖3.評估板MAX4146x EVK外形圖

　　圖4.評估板MAX4146x EVK電路圖

　　評估板MAX4146x EVK元件列表：

　　評估板MAX4146x EVK材料清單：

　　圖5.評估板MAX4146x EVK PCB設計圖（1）：左：頂層元件分布圖;右：頂層布局圖

　　圖6.評估板MAX4146x EVK PCB設計圖（2）：左：底層布局圖;右：底層絲圖