SSM2304
The SSM2304 is a fully integrated, high efficiency, Class-D stereo audio amplifier. It is designed to maximize performance for portable applications. The application circuit requires a mini-mum of external components and operates from a single 2.5 V to 5.0 V supply. It is capable of delivering 2 W of continuous output power with less than 10% THD + N driving a 4 Ω load from a 5.0 V supply.
The SSM2304 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 SSM2304 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 SSM2304 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 SSM2304 also has excellent rejection of power supply noise, including noise caused by GSM transmission bursts and RF rectification.
The SSM2304 has a preset gain of 18 dB, which can be reduced by using external resistors.
The SSM2304 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).
SSM2304 应用
- Notebooks and PCs
- Mobile phones
- MP3 players
- Portable gaming
- Portable electronics
- Educational toys
SSM2304 特点
- Filterless Class-D amplifier with built-in output stage
- 2 W into 4 Ω and 1.4 W into 8 Ω at 5.0 V supply with <10% THD
- 85% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
- Better than 98 dB SNR (signal-to-noise ratio)
- Available in 16-lead, 3 mm × 3 mm LFCSP
- Single-supply operation from 2.5 V to 5.0 V
- 20 nA ultralow shutdown current
- Short-circuit and thermal protection
- Pop-and-click suppression
- Built-in resistors reduce board component count
- Default fixed 18 dB gain and user-adjustable
SSM2304 功能框图
Functional Block Diagram for SSM2304
SSM2304 技术指标
| Output Power (W) | 2W | Supply Current | 7mA |
SSM2304 芯片订购指南
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| SSM2304CPZ-REEL | 量产 | 16 ld LFCSP (3x3mm, 1.50mm exposed pad) | 16 | 工业 |
| SSM2304CPZ-REEL7 | 量产 | 16 ld LFCSP (3x3mm, 1.50mm exposed pad) | 16 | 工业 |
| SSM2304Z-EVAL | 量产 | 评估板 | 工业 |