The **SSM2301CPZ-R2** is a high-efficiency, filterless Class-D audio amplifier manufactured by Analog Devices. It is specifically designed for mobile applications where space and power consumption are critical. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Type** | Class-D Audio Amplifier | | **Output Power** | 1.4W into 8 $\Omega$ (at 5.0V) | | **Supply Voltage** | 2.5V to 5.5V | | **Efficiency** | > 85% at 400mW | | **SNR (Signal-to-Noise Ratio)** | 98 dB | | **Package** | 8-Lead LFCSP (Lead Frame Chip Scale Package) | | **Mounting Type** | Surface Mount | --- ### 2. Core Features * **Filterless Design:** The device utilizes a proprietary $\Sigma$-$\Delta$ (Sigma-Delta) modulation scheme. This allows the amplifier to drive speakers directly without the need for bulky external LC (Inductor-Capacitor) filters, significantly reducing the BOM (Bill of Materials) cost and PCB footprint. * **Low Noise & Distortion:** It maintains high fidelity with a low THD+N (Total Harmonic Distortion plus Noise), typically around 0.04%. * **Ultra-Low Shutdown Current:** When the device is disabled, it consumes less than 20nA, which is ideal for battery-powered devices to preserve energy. * **Pop-and-Click Suppression:** Integrated circuitry minimizes audible transients during power-up and power-down cycles. --- ### 3. Pin Configuration Overview | Pin | Name | Description | | :--- | :--- | :--- | | 1 | **SD** | Shutdown (Active Low) | | 2 | **IN+** | Non-Inverting Audio Input | | 3 | **IN-** | Inverting Audio Input | | 4 | **VDD** | Power Supply (2.5V - 5.5V) | | 5 | **GND** | Ground | | 6 | **OUT+** | Positive Audio Output | | 7 | **OUT-** | Negative Audio Output | | 8 | **NC** | No Connection | --- ### 4. Typical Application Circuit The circuit is straightforward due to the filterless nature. Only input capacitors and a decoupling capacitor for the power supply are strictly required. ```markdown [Audio Source] ---||---(IN+) [ SSM2301 ] (OUT+)--- [Speaker] [Audio Source] ---||---(IN-) [ ] (OUT-)--- [Speaker] | | (GND) (VDD) --- [5V Battery] ``` --- ### 5. Common Applications * Mobile Handsets / Smartphones * Portable Media Players (PMPs) * Handheld Gaming Consoles * Portable GPS Navigators