Analog Devices Inc. SSM3582 Class-D Audio Amplifiers
Analog Devices SSM3582 Class-D Audio Amplifiers feature high efficiency, fully integrated, digital input stereo Class-D audio amplifiers. The SSM3582’s proprietary, spread spectrum Σ-Δ modulation scheme allows direct connection to the speaker. The direct connection ensures state-of-the-art analog performance and lowers radiated emissions compared to other Class-D architectures. An optional ultra-low Electromagnetic Interference (EMI) mode reduces radiated emissions above 100MHz.
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.
Features
- 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
Applications
- Mobile computing
- All in one computer
- Portable electronics
- Wireless speakers
- Televisions
Functional Block Diagram
Evaluation Board
Analog Devices Inc. EVAL-SSM3582Z Evaluation Board
Helps evaluate the SSM3582 31.76W, Digital Input, Filterless Stereo Class-D Audio Amplifier.