Analog Devices Inc. SSM3582 D类音频放大器
Analog Devices SSM3582是一款全集成式高效率、数字输入D类立体声音频放大器。 SSM3582的专有扩频Σ-Δ调制方案可直接连接到扬声器。 直接连接确保顶尖的模拟性能，同时与其它D类架构相比，可提供更低的辐射。 可选的超低电磁干扰(EMI)模式极大降低了100MHz以上的电磁辐射。 音频通过数字化方式传输至放大器。 该传输方法最大程度地减小数字环境下的信号损坏可能性。 SSM3582提供出色的模拟性能，信噪比超过106dB， 总谐波失真加噪声(THD+ N)低至 0.004%。SSM3582采用4.5V至16V单电源供电，能够以不到1%的总谐波失真(THD)将2 × 15 Wrms连续驱动至4Ω和8Ω负载。 SSM3582的高效率调制方案在各种阻抗范围内保持出色的功效。 SSM3582放大器驱动至8Ω负载时的功率为93%，而驱动至4Ω负载时的功率为90%。 经优化的输出脉冲在阻抗低至3Ω/5μH时仍保持性能，可配合更宽的带宽tweeter使用。 SSM3582放大器的额定温度范围为−40°C至+85°C商用温度范围。该放大器内置热关断和输出短路保护功能、提前过热报警以及可编程增益限幅特性以维持工作。
The audio is digitally transmitted to the amplifier. This transmission method minimizes the possibility of signal corruption in digital environments. The SSM3582 amplifiers deliver an outstanding analog performance with a 106dB signal-to-noise ratio and a low 0.004% total harmonic distortion (THD) + N. Operating from a single 4.5V to 16V supply, SSM3582 amplifiers deliver 2 x 15Wrms continuously into 8Ω and 4Ω loads at <1% THD. SSM3582’s efficient modulation scheme maintains excellent power efficiency over a wide range of impedances.
Optimization of the output pulse maintains performance at impedances as low as 3Ω/5μH, enabling its use with extended bandwidth tweeters. These SSM3582 amplifiers are specified over the commercial temperature range of −40°C to +85°C. The SSM3582 amplifiers offer built-in thermal shutdown and output short-circuit protection, as well as an early thermal warning with programmable gain limiting to maintain operation.
特性
- Digital input stereo, high-efficiency Class-D amplifiers
- Operates from a single 4.5V to 16V supply
- State-of-the-art, proprietary, filterless Σ-Δ modulation
- 106.5dB signal-to-noise ratio
- 0.004% total harmonic distortion plus noise (THD + N) at 5W into 8Ω
- 38.5μVrms A-weighted output noise
- Pop/clickless on/off sequence
- 2x 14.67W output at 12V supply to 4Ω loads at <1% THD + N
- 2x 14.4W output at 16V supply to 8Ω loads at <1% THD + N
- Mono mode for increased maximum output power
- 1x 49.69W output at 16V supply to 2Ω loads at <1% THD + N
- Support for low impedance loads:
- As low as 3Ω/5μH in stereo mode
- As low as 2Ω/5μH in mono mode
- High power efficiency:
- 93.8% efficiency into an 8Ω load
- 90.6% efficiency into a 4Ω load
- 12.34mA quiescent current with single 12V PVDD supply
- Single supply operation with internal LDOs or option to use an external 5V and 1.8V supply for lowest power consumption
- I2C control and hardware modes with up to 16 pin-selectable slots/addresses
- Supported sample rates from 8kHz to 192kHz, 24-bit resolution
- Multiple PCM audio serial data formats:
- TDM slave with support for up to 16 devices on a single bus
- I2C or left-justified slave
- Adjustable full-scale output tailored for many PVDD sources
- 2- and 3-cell Li-Ion batteries
- Digital volume control with a selectable smooth ramp
- Automatic power-down function
- Supply monitoring Automatic Gain Control (AGC) function reduces system brownout
- Standalone operational mode without I2C
- Temperature sensor with 1°C step readout via I2C
- Short-circuit, undervoltage, and thermal protection
- Thermal early warning
- Power-on reset
- PVDD sensing ADC
- 40-lead, 6mm x 6mm LFCSP with thermal pad
应用
- Mobile computing
- All in one computer
- Portable electronics
- Wireless speakers
- Televisions
Functional Block Diagram
