SSM2335 无需滤波的高效单声道3W,D类音频放大器,音频放大器,放大器和比较器
The SSM2335 is a fully integrated, high efficiency, Class-D 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 5.5 V supply. It is capable of delivering 3 W of continuous output power with <1% THD + N driving a 3 Ω load from a 5.0 V supply.
The SSM2335 features a high efficiency, low noise modulation scheme that requires no external LC output filters. The modu-lation continues to provide high efficiency even at low output power. It operates with 93% efficiency at 1.4 W into 8 Ω or 85% efficiency at 3 W into 3 Ω from a 5.0 V supply and has an SNR of >96 dB. Spread-spectrum pulse density modulation is used to provide lower EMI-radiated emissions compared with other Class-D architectures.
The SSM2335 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 device also includes pop-and-click suppression circuitry. This suppression circuitry minimizes voltage glitches at the output during turn-on and turn-off, reducing audible noise on activation and deactivation.
The fully differential input of the SSM2335 provides excellent rejection of common-mode noise on the input. Input coupling capacitors can be omitted if the input dc common-mode voltage is approximately VDD/2.
The default gain of the SSM2335 is 18 dB, but users can reduce the gain by using a pair of external resistors (see the Gain section).
The SSM2335 is specified over the industrial temperature range of -40°C to +85°C. It has built-in thermal shutdown and output short-circuit protection. It is available in a 9-ball, 1.5 mm × 1.5 mm wafer level chip scale package (WLCSP).
SSM2335 应用
- Mobile phones
- MP3 players
- Portable gaming
- Portable electronics
- Educational toys
SSM2335 特点
- Filterless Class-D amplifier with Σ-Δ modulation
- No sync necessary when using multiple Class-D amplifiers from Analog
- Devices, Inc.
- 3 W into 3 Ω load and 1.4 W into 8 Ω load at 5.0 V supply with <1% total
- harmonic distortion (THD + N)
- 93% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
- >96 dB signal-to-noise ratio (SNR)
- Single-supply operation from 2.5 V to 5.5 V
- 20 nA ultralow shutdown current
- See data sheet for additional features
SSM2335 功能框图
Functional Block Diagram for SSM2335
SSM2335 技术指标
| SNR (dB) | 96dB | Supply Current | 3.63mA |
| Efficiency (%) | 93% | Pos Supply | +2.5V to +5.5V |
| Output Power (W) | 3W |
SSM2335 芯片订购指南
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| EVAL-SSM2335Z | 量产 | 评估板 | 工业 | |
| SSM2335CBZ-REEL | 量产 | 9 | 工业 | |
| SSM2335CBZ-REEL7 | 量产 | 9 | 工业 |