300MHz–960MHz ASK and (G)FSK Transmitter with SPI Interface

The MAX41460 is a UHF sub-GHz ISM/SRD transmitter is designed to transmit On-Off Keying (OOK), Amplitude-Shift Keying (ASK), Frequency-Shift Keying (FSK), and Gaussian (G)FSK (or 2GFSK) data in the 286MHz to 960MHz frequency range. It integrates a fractional phase-locked-loop (PLL) so that a single, low-cost crystal can be used to generate commonly used world-wide sub-GHz frequencies. The fast response time of the PLL allows for frequency-hopping, spread spectrum protocols for increased range and security. The only frequency-dependent components required are for the external antenna-matching network.

The crystal-based architecture of the MAX41460 provides greater modulation depth, faster frequency settling, higher tolerance of the transmit frequency, and reduced temperature dependence.

The MAX41460 provides output power up to +13dBm into a 50Ω load while only drawing < 8mA for ASK (Manchester coded) and < 12mA for (G)FSK transmission at 315MHz. The output load can be adjusted to increase power up to +16dBm, and a PA boost mode can be enabled at frequencies above 850MHz to compensate for losses. The PA output power can also be controlled using programmable register settings.

The MAX41460 features single-supply operation from +1.8V to +3.6V. The device has an auto-shutdown feature to extend battery life and a fast oscillator wake-up on data activity detection. A serial programmable interface make the MAX41460 compatible with almost any microcontroller or code-hopping generator.

The MAX41460 is available in a 10-pin µMAX package and is specified over the -40°C to +105°C extended temperature range. The MAX41460 has an ESD rating of 2.5kV HBM.

Design Solution: How to Maximize the Wireless Power Range of Your UHF Sub-GHz Short-Range Device ›

Applications

* Automatic Meter Reading (AMR) * Building Automation and Security * Garage Door Openers (GDO) * Internet of Things (IoT) Sensor Networks * Radio Control Toys * Remote Keyless Entry (RKE) * Tire Pressure Monitoring Systems (TPMS)

* Low Implementation Cost

* Bits-to-RF Single-Wire Operation

* Low Bill-of-Materials (BoM)

* Uses Single, Low-Cost, 16MHz Crystal

* Small 3mm x 3mm µMAX-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