今天小编要和大家分享的是ssm2380,d类相关信息，接下来我将从基于ssm2380设计的d类立体声音频放大技术，ssm2356cbz-reel7 (ad [2 × 2w无滤波器d类立体声器]这几个方面来介绍。
ssm2380是adi公司的带alc+i2c的无滤波器2x2w d类立体声音频放大器,单电源2.5v到5.5v工作,在5.0v电源时能向4欧姆负载提供2w连续输出功率,而thd+n小于1%,效率为93%,信噪比大于100db.ssm2380主要应用在手机,mp3播放器,手提电子设备.本文介绍ssm2380主要特性, 功能方框图, i2c 模式, alc 模式和增益模式的典型应用电路图及其配置图.
高效d类立体声音频放大器：http://www.elecfans.com/soft/ic/2009/2009042923982.htmlssm2380: 2x2w filterless class-d stereo audio amplifier with alc + i2c the ssm2380 is a fully integrated, high efficiency, stereo 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 2 w of continuous output power with <1% thd + n driving a 4 Ω load from a 5.0 v supply.the ssm2380 features a highly flexible i2c interface with many useful settings. using the i2c control interface, the gain of ssm2380 can be selected from 1db to 24 db + mute in 47 steps with no external components. other features accessed from the i2c interface are: independent l/r channel shutdown, variable ultra-low emi emission control mode, automatic level control (alc) for high quality speaker protection, and stereo-to-mono mixing operation.the ssm2380 features a high efficiency, low noise modulation scheme that requires no external lc output filters. the modulation 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 2w into 4 ω from a 5.0 v supply and has an snr of >100 db. spread-spectrum pulse density modulation is used to provide lower emi-radiated emissions compared with other class-d architectures. an added benefit of spread-spectrum σ-δ modulation is that no synchronization (sync) is needed when using multiple class-d amplifiers. for applications that require long speaker cables (>10cm), the ssm2380 includes a user selectable ultra-low emi emission mode that eliminates the need for emi filters at the class-d outputs.the ssm2380 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 or optional independent channel soft shutdown via i2c.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 inputs of the ssm2380 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 ssm2380 is specified over the commercial temperature range (−40℃ to +85℃). it has built-in thermal shutdown and output short-circuit protection. it is available in a 16-lead, 2 mm × 2 mm wafer level chip scale package (wlcsp).ssm2380主要特性:filterless stereo class-d amplifier with delta-sigma modulation2 w into 4ohm load and 1.4 w into 8ohm load at 5.0 v supply with <1% total harmonic distortion (thd + n)highly configurable i2c interface for gain adjust, automatic level control (alc) and ultra-low emi emission modemode pin can disable i2c interface for more traditional stereo amplifier configurationstereo-to-mono mixer option via i2c control93% efficiency at 5.0 v, 1.4 w into 8ohm speaker>100 db signal-to-noise ratio (snr)single-supply operation from 2.5 v to 5.5 v20 na ultralow shutdown currentshort-circuit and thermal protectionpop-and-click suppressionavailable in 16-ball, 2.0 mm × 2.0 mm wlcspssm2380应用:mobile phonesmp3 playersportable electronics图1.ssm2380功能方框图图2.ssm2380典型应用电路– i2c 模式图3.ssm2380增益配置(mode引脚=gnd)图4.ssm2380典型应用电路– alc 模式图5.ssm2380 alc运行配置(mode引脚=开路/不接)图6.ssm2380典型应用电路– 增益模式图7.ssm2380 增益运行配置(mode引脚=vdd)