SSM2302 音频放大器,放大器和比较器,美国模拟器件
The SSM2302 is a fully integrated, high efficiency, Class-D stereo audio amplifier. It is designed to maximize performance for mobile phone applications. The application circuit requires a minimum of external components and operates from a single 2.5 V to 5.0 V supply. It is capable of delivering 1.4 W of continuous output power with less than 1% THD + N driving an 8 Ω load from a 5.0 V supply.
The SSM2302 features a high efficiency, low noise modulation scheme. It operates with 85% efficiency at 1.4 W into 8 Ω from a 5.0 V supply and has a signal-to-noise ratio (SNR) that is better than 98 dB. PDM modulation is used to provide lower EMI-radiated emissions compared with other Class-D architectures.
The SSM2302 has a micropower shutdown mode with a typical shutdown current of 20 nA. Shutdown is enabled by applying a logic low to the SD pin.
The architecture of the device allows it to achieve a very low level of pop and click. This minimizes voltage glitches at the output during turn-on and turn-off, thus reducing audible noise on activation and deactivation.
The fully differential input of the SSM2302 provides excellent rejection of common-mode noise on the input. Input coupling capacitors can be omitted if the dc input common-mode voltage is approximately VDD/2.
The SSM2302 also has excellent rejection of power supply noise, including noise caused by GSM transmission bursts and RF rectification. PSRR is typically 63 dB at 217 Hz.
The gain can be set to 6 dB or 12 dB utilizing the gain control select pin connected respectively to ground or VDD. Gain can also be adjusted externally by using an external resistor.
The SSM2302 is specified over the commercial temperature range (-40°C to +85°C). It has built-in thermal shutdown and output short-circuit protection. It is available in a 16-lead, 3 mm × 3 mm lead-frame chip scale package (LFCSP).
SSM2302 应用
- Mobile phones
- MP3 players
- Portable gaming
- Portable electronics
- Educational toys
SSM2302 特点
- Filterless Class-D amplifier with built-in output stage
- 1.4 W into 8 Ω at 5.0 V supply with less than 1% THD
- 85% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
- Better than 98 dB SNR (signal-to-noise ratio)
- Single-supply operation from 2.5 V to 5.0 V
- 20 nA ultralow shutdown current
- Short-circuit and thermal protection
- Available in 16-lead, 3 mm × 3 mm LFCSP
- Pop-and-click suppression
- Built-in resistors reduce board component count
- Fixed and user-adjustable gain configurations
SSM2302 功能框图
Functional Block Diagram for SSM2302
SSM2302 技术指标
| Output Power (W) | 2W |
SSM2302 芯片订购指南
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| SSM2302CPZ-R2 | 量产 | 16 ld LFCSP (3x3mm, 1.50mm exposed pad) | 16 | 工业 |
| SSM2302CPZ-REEL | 量产 | 16 ld LFCSP (3x3mm, 1.50mm exposed pad) | 16 | 工业 |
| SSM2302CPZ-REEL7 | 量产 | 16 ld LFCSP (3x3mm, 1.50mm exposed pad) | 16 | 工业 |
| SSM2302Z-EVAL | 量产 | 评估板 | 工业 |