RF Transmitters

Image	Part Number	Description / PDF	Quantity	Rfq
	TXM-869-ES Linx Technologies	RF XMITTER FM/FSK 869MHZ MODULE	0
	SI4710-B30-GMR Silicon Labs	RF XMITTER FM 76-108MHZ 20UFQFN	0
	PIC12F529T48AT-I/ST Roving Networks / Microchip Technology	RF TX IC FSK 418/434MHZ 14TSSOP	0
	ATA5774C-PXQW-1 Roving Networks / Microchip Technology	RF XMITTER UHF 429-439MHZ 24VQFN	0
	PIC12LF1840T48A-I/ST Roving Networks / Microchip Technology	RF TX IC FSK 418/433MHZ 14TSSOP	0
	TDK5100XUMA1 IR (Infineon Technologies)	RF TX IC ASK 433-435MHZ 16TSSOP	0
	TXM-900-HP3-SPS Linx Technologies	RF TX IC FM 902-928MHZ 24SMD MOD	0
	SX1223I073TRT Semtech	RF TX IC FSK 425-475MHZ 24WFQFN	0
	TH72036KLD-CAA-000-TU Melexis	RF TX IC ASK 868/915MHZ 10VFDFN	0
	TXE-315-KH Linx Technologies	RF TX IC ASK 315MHZ 24SMD MOD	0
	AMRT4-315 RF Solutions	RF TRANSMITTER AM 315MHZ MODULE	0
	ATA8405-6DQY-66 Roving Networks / Microchip Technology	RF TX IC ASK/FSK 433MHZ 10TFSOP	0
	MLX72013KDC-AAA-000-RE Melexis	RF XMITTER ASK/FSK 433MHZ 8SOIC	0
	ATA5757-6DPY-66 Roving Networks / Microchip Technology	RF TX IC ASK/FSK 433MHZ 10TFSOP	0
	MC33493DTBR2 NXP Semiconductors	RF TX IC FSK 315-434MHZ 14TSSOP	0
	U2741B-NFB Roving Networks / Microchip Technology	RF TX IC UHF 300-450MHZ 16LSSOP	0
	CC1151TRHBRG4Q1 Texas Instruments	RF TX IC FSK 310-348MHZ 32VFQFN	0
	TDK5111XUMA1 IR (Infineon Technologies)	RF TX IC ASK 314-317MHZ 16TSSOP	0
	ATA8742-PXQW Roving Networks / Microchip Technology	RF XMITTER ASK/FSK 433MHZ 24VQFN	0
	U2741B-NFBG3 Roving Networks / Microchip Technology	RF TX IC UHF 300-450MHZ 16LSSOP	0

RF Transmitters

1. Overview

RF (Radio Frequency) transmitters are electronic devices that generate and transmit high-frequency electromagnetic waves for wireless communication. IF (Intermediate Frequency) components process signals at intermediate stages in transceivers. RFID (Radio Frequency Identification) RF transmitters specifically enable contactless data exchange between tags and readers. These technologies form the backbone of modern wireless systems, supporting applications from mobile communications to IoT networks.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
ISM Band Transmitters	Unlicensed operation at 2.4 GHz/900 MHz	Wi-Fi routers, Bluetooth devices
Cellular Transmitters	5G/LTE protocol support with power control	Smartphones, base stations
UHF RFID Readers	860-960 MHz frequency agility	Warehouse inventory systems
HF RFID Modules	13.56 MHz contactless payment support	Access control terminals

3. Structure and Components

Typical RF transmitter architecture includes: Power Amplifier (PA) for signal boosting, Voltage-Controlled Oscillator (VCO) for frequency generation, modulator for data encoding, impedance matching networks, and antenna interfaces. Advanced systems integrate DSP cores for digital modulation (QAM, OFDM) and temperature-compensated crystal oscillators (TCXO) for stability. RFID variants add protocol-specific encoding circuits and impedance-tuned front-ends.

4. Key Technical Specifications

Parameter	Significance
Frequency Range: 300 MHz - 6 GHz	Determines application compliance (e.g., FCC Part 15.247)
Output Power: 0.1 - 30 dBm	Affects transmission distance and regulatory class
Modulation Accuracy: EVM < 5%	Ensures data integrity in dense environments
Current Consumption: 5-100 mA	Battery life consideration for IoT devices

5. Application Fields

Telecommunications: 5G small cells, satellite modems
Logistics: UHF RFID for supply chain tracking
Healthcare: Medical implant telemetry systems
Retail: NFC payment terminals (13.56 MHz HF RFID)

Case Study: Amazon's warehouse robots use 868 MHz RFID readers for real-time inventory with 5 cm accuracy.

6. Leading Manufacturers and Products

Vendor	Representative Product
TI (Texas Instruments)	CC1352P7 multi-band wireless MCU
Nordic Semiconductor	nRF52840 Bluetooth 5.3 SoC
Impinj	R420 UHF Gen2 RFID reader
STMicroelectronics	CR95HF NFC/RFID transceiver

7. Selection Guidelines

Determine regulatory requirements (FCC/ETSI compliance)
Match frequency to use case (e.g., 900 MHz for liquid penetration)
Evaluate environmental factors (temperature, interference)
Assess protocol compatibility (LoRaWAN, BLE 5.4)
Optimize power vs. range trade-offs

8. Industry Trends

Key developments include: - 5G integration with sub-6 GHz RF front-ends - RFID moving to microwave frequencies (2.45 GHz active tags) - AI-enhanced spectrum sensing for dynamic frequency selection - Miniaturization via SiP (System-in-Package) technology - Energy harvesting transmitters for battery-free IoT