RF Transmitters

Part Number	Description / PDF	Quantity
TH72016KLD-CAA-000-SP Melexis	RF TX IC ASK/FSK 433MHZ 10VFDFN	112
TH72002KDC-BAA-000-SP Melexis	RF TRANSMITTER ASK 315MHZ 8SOIC	14
TH72036KLD-CAA-000-SP Melexis	RF TX IC ISM 850-930MHZ 10VFDFN	6
MLX72013KDC-AAA-000-SP Melexis	RF TRANSMITTER ISM 433MHZ 8SOIC	58
TH72031KDC-BAA-000-SP Melexis	RF XMITTER FSK 868/915MHZ 8SOIC	14
TH72031KDC-BAA-000-TU Melexis	RF XMITTER FSK 868/915MHZ 8SOIC	0
MLX72013CDC-AAA-000-TU Melexis	RF XMITTER ASK/FSK 433MHZ 8SOIC	0
MLX72013CDC-AAA-000-RE Melexis	RF XMITTER ASK/FSK 433MHZ 8SOIC	0
TH72035KLD-BAA-000-RE Melexis	RF TX IC ASK 868/915MHZ 10VFDFN	0
TH7108EFC Melexis	RF TX IC ASK 850-920MHZ 16SSOP	0
TH72012KDC-BAA-000-TU Melexis	RF XMITTER ASK 380-450MHZ 8SOIC	0
TH72035KLD-BAA-000-SP Melexis	RF TX IC ISM 850-930MHZ 10VFDFN	0
TH72001KDC-BAA-000-TU Melexis	RF TRANSMITTER FSK 315MHZ 8SOIC	0
TH71081EDC Melexis	RF XMITTER ASK 800-930MHZ 8SOIC	0
TH71072EDC Melexis	RF XMITTER ASK 310-450MHZ 8SOIC	0
TH72032KDC-BAA-000-SP Melexis	RF XMITTER ASK 868/915MHZ 8SOIC	0
TH72005KLD-BAA-000-SP Melexis	RF TX IC ISM 290-350MHZ 10VFDFN	0
TH71071EDC Melexis	RF XMITTER ASK 310-450MHZ 8SOIC	0
TH72011KDC-BAA-000-RE Melexis	RF TRANSMITTER FSK 433MHZ 8SOIC	0
TH72015KLD-BAA-000-SP Melexis	RF TX IC ISM 380-450MHZ 10VFDFN	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