### Overview of the SE5003L-R The **SE5003L-R** is a high-power, fully integrated Power Amplifier (PA) designed for the 5 GHz band, specifically targeting **IEEE 802.11a/n/ac** wireless LAN applications. It is manufactured by Skyworks Solutions. --- ### Technical Specifications The following table summarizes the key electrical characteristics of the SE5003L-R: | Parameter | Specification | Units | | :--- | :--- | :--- | | **Frequency Range** | 5.15 – 5.85 | GHz | | **Supply Voltage (Vcc)** | 3.0 – 5.0 | V | | **Output Power (802.11ac)** | +20 (at 1.8% EVM) | dBm | | **Output Power (802.11n)** | +23 (at 3% EVM) | dBm | | **Gain** | 32 (Typical) | dB | | **Package Size** | 4.0 x 4.0 x 0.9 | mm | | **Package Type** | QFN (20-pin) | - | --- ### Key Features and Internal Components 1. **Integrated Power Detector:** Includes a temperature-compensated power detector to monitor output power levels, which provides a range of over 20dB for precise power control. 2. **Harmonic Filter:** Features an integrated notch filter for harmonic rejection, simplifying the external Bill of Materials (BOM). 3. **Input/Output Matching:** The device is fully matched to 50 $\Omega$ internally, meaning designers do not need complex external impedance matching circuits. 4. **Enable Pin (EN):** A digital pin used to switch the device between active mode and a low-current power-down mode. --- ### Application Circuitry When integrating the SE5003L-R into a PCB layout, the following components are typically required: * **Decoupling Capacitors:** Used on $V_{CC}$ lines to filter high-frequency noise. * **Reference Voltage ($V_{REF}$):** Used to set the bias current for the amplifier stages. * **Thermal Pad:** The center pad of the QFN package must be soldered to the PCB ground plane to dissipate heat efficiently. --- ### Pin Configuration (Common Pins) | Pin # | Label | Description | | :--- | :--- | :--- | | 1 | RFIN | RF Input (AC coupled) | | 3 | EN | PA Enable (High = Active) | | 7 | VCC1 | First Stage Supply Voltage | | 15 | RFOUT | RF Output / DC Supply for Final Stage | | 18 | DET | Power Detector Output | | Center | GND | Ground / Thermal Heat Sink |