The **SE5004L-R** is a high-performance Power Amplifier (PA) designed specifically for the 5 GHz band, primarily used in IEEE 802.11a/n/ac WLAN (Wi-Fi) applications. It is manufactured by Skyworks Solutions. --- ## 1. Key Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Frequency Range** | 5.15 GHz to 5.85 GHz | | **Gain** | ~32 dB (High Power Mode) | | **Output Power** | +20 dBm @ 2.5% EVM (802.11a/n) | | **Supply Voltage (VCC)** | 3.0 V to 5.0 V | | **Package Type** | 20-pin QFN (4mm x 4mm x 0.9mm) | | **Linearity** | Optimized for high-order modulation (64 QAM / 256 QAM) | --- ## 2. Functional Blocks The SE5004L-R integrates several critical electronic components into a single silicon-germanium (SiGe) or GaAs BiCMOS die: * **Three-Stage Amplifier:** Provides high gain to boost weak signals from the Wi-Fi chipset to a level suitable for antenna transmission. * **Power Detector:** An on-chip "directional coupler" that provides a closed-loop feedback voltage (Vdet) to the system to monitor output power accuracy. * **Enable/Reference Circuitry:** Includes an active-high enable pin (EN) for power-down mode, reducing current consumption when the radio is not transmitting. * **Input/Output Matching:** The device is internally matched to 50 $\Omega$ to simplify the PCB design and reduce the need for external surface-mount components. --- ## 3. Pin Configuration (Simplified) Below is a representation of the typical pinout for the SE5004L-R: | Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | RFIN | RF Input Signal | | 3 | VCC1 | First Stage Supply Voltage | | 8 | VDET | Detector Output Voltage | | 14 | VCC2/3 | Second/Third Stage Supply | | 20 | RFOUT | RF Output Signal | | Center Pad | GND | Ground / Thermal Heat Sink | --- ## 4. Typical Application Diagram In a standard circuit, the SE5004L-R is positioned between the Wi-Fi Transceiver and the Antenna Switch. ```mermaid graph LR A[Wi-Fi Chipset] -->|Low Power RF| B(SE5004L-R PA) B -->|High Power RF| C[Band Pass Filter] C --> D[Antenna] B -.->|Vdet| A ``` --- ## 5. Main Advantages 1. **High Linearity:** Crucial for 802.11ac standards to ensure data integrity at high speeds. 2. **Thermal Efficiency:** The QFN package with a central ground pad allows for effective heat dissipation. 3. **Low Current Draw:** Optimized for mobile or battery-powered access points.