Infineon TDA5211XUMA1: A Comprehensive Datasheet and Application Overview
The Infineon TDA5211XUMA1 is a highly integrated, low-power single-chip RF receiver designed for remote keyless entry (RKE) systems and other ISM band applications operating at 433.92 MHz. This advanced IC combines a superheterodyne architecture with sophisticated digital signal processing to deliver exceptional sensitivity, selectivity, and reliability in a compact package, making it a cornerstone component for automotive and industrial wireless solutions.
Key Features and Electrical Characteristics
Housed in a space-saving PG-SSO-14-1 package, the TDA5211XUMA1 is engineered for performance and efficiency. Its core specifications define its capabilities in demanding RF environments.
High Sensitivity: The receiver boasts an outstanding sensitivity of -109 dBm (typical), enabling it to reliably detect very weak signals, which is critical for extending the operational range of RKE fobs and other transmitters.
Low Power Consumption: Designed for battery-powered applications, it features a very low supply current of just 3.5 mA in typical operation, significantly contributing to longer battery life in handheld transmitters and receiver modules.
Integrated IF Filter: The chip includes an on-chip IF filter and demodulator, eliminating the need for external ceramic filters and coils. This integration simplifies PCB design, reduces the bill of materials (BOM), and enhances production consistency.
Robust Performance: With an image rejection of 50 dB (typical) and excellent blocking performance, the receiver can maintain stable operation even in the presence of strong interfering signals, a common challenge in the crowded 433 MHz band.
Digital RSSI Output: The device provides a digital received signal strength indicator (RSSI) output. This feature is invaluable for system diagnostics, range testing, and implementing advanced functions like proximity detection.
Internal Architecture and Functionality
The TDA5211XUMA1 employs a superheterodyne receiver architecture, the gold standard for high-performance RF reception. The incoming 433.92 MHz signal from the antenna is first amplified by a low-noise amplifier (LNA). It is then down-converted to an intermediate frequency (IF) by a mixer using a signal from an internal phase-locked loop (PLL) and voltage-controlled oscillator (VCO). The on-chip ceramic filter precisely shapes the IF signal before it is demodulated by a limiter-discriminator stage. Finally, the recovered data is shaped and presented as a clean digital output signal ready for processing by an external microcontroller (MCU).
Typical Application Circuit
Implementing the TDA5211XUMA1 is straightforward. A basic application circuit requires a minimal number of external components:
A PCB antenna or a short wire antenna.
A few decoupling capacitors on the supply lines.
A crystal resonator (typically 13.56 MHz or 6.78 MHz) to provide the reference frequency for the internal PLL.
A pull-up resistor for the data output line.
The MCU interface is simple, typically consisting of the data output line (DATA), a power-down control pin (PDN), and the RSSI output.
Primary Applications
The primary application for this IC is in automotive RKE systems, where it receives the coded signal from a key fob to lock/unlock doors or open the trunk. Its versatility also makes it suitable for a wide range of other uses, including:
Home Security Systems: For wireless door/window sensors and remote controls.
Garage Door Openers: Receiving commands from remote transmitters.
Industrial Remote Control: For simple, reliable wireless data links in industrial environments.
Telemetry Systems: Transmitting small packets of sensor data over short distances.
The Infineon TDA5211XUMA1 stands out as a highly optimized, cost-effective solution for short-range wireless data reception at 433.92 MHz. Its exceptional integration, remarkable sensitivity, and ultra-low power consumption make it an ideal choice for mass-produced, battery-sensitive applications like automotive RKE. By offering robust performance with a minimal external component count, it accelerates development time, reduces system cost, and ensures high reliability, solidifying its position as a go-to component for designers in the ISM band space.
Keywords: Remote Keyless Entry (RKE), 433.92 MHz ISM Band, Low-Power RF Receiver, Superheterodyne Architecture, High Sensitivity
