联芯科技有限公司(简称“联芯科技”)是大唐电信科技产业集团的核心企业之一,秉承大唐电信集团在TD-SCDMA、TD-LTE领域的核心技术及专利的积极成果,十余年专注于TD-SCDMA及TD-LTE的终端核心技术研发与应用。联芯科技总部位于上海,在全球拥有1000余名员工,其TD-SCDMA、TD-LTE芯片及整体解决方案,涵盖功能手机、智能手机、融合终端以及测试终端产品,为全球各地超过40家终端制造商提供成熟稳定、全面细分的产品方案选择。联芯科技坚持以创新为客户创造价值,相信科技的魅力来自对公众的意义,有志并努力发展成为全球领先的移动互联网芯片及解决方案提供商,致力于从根本上改善、丰富人们的生活。
智能手机解决方案:INNOPOWER® LC1810双核 A9 TD智能手机芯片;INNOPOWER® LC1811双核 A9 TD智能终端芯片;INNOPOWER® LC1813四核智能手机芯片
平面电脑解决方案:INNOPOWER® LC1913四核平板电脑芯片
融合终端解决方案:DTivy® L系列融合终端解决方案:INNOPOWER® LC1713 TD-HSPA/GGE Modem基带芯片;DTivy® L1711 MS 智能手机及模块类产品Modem解决方案;DTivy® L1710 FWT:低成本功能手机及无线固话解决方案;DTivy® L1708:无线固话&Modem解决方案
功能手机解决方案:INNOPOWER® LC1712 TD-HSPA/GGE FP基带芯片;DTivy® L1710FP 低成本功能手机及无线固话解决方案;DTivy® L1808B: 全系列功能手机解决方案;DTivy® L1808: Feature Phone解决方案
TD-LTE 解决方案:INNOPOWER® LC1761 LTE 多模基带芯片;INNOPOWER® LC1761L LTE 双模基带芯片;DTivy® L1760 :TD-LTE TD-HSPA双模终端解决方案;TD-LTE/TD-SCDMA双模数据卡LC5760;INNOPOWER® LC1860 LTE SoC 智能手机芯片;INNOPOWER ® LC1860C LTE SoC 智能手机芯片
TD-SCDMA 测试终端:TD-HSPA/GGE测试手机LC8143(支持HANDY功能);GGE 测试手机 LC8122;TD-LTE单芯片双模 测试数据卡LC5160;PTAS测试工具软件
TD-SCDMA 手机应用平台:LARENA社区业务;TD-SCDMA 手机应用平台LARENA 3.0
1W AB类 音频功率放大器
功能特点
AF4890 1W CLASS-AB Audio Power Amplifier
AF4890 1W AB类 音频功率放大器
纹波抑制比PSRR:62dB (217Hz, 5V)
输出功率PO:1W (5V, 8Ω, 1%THD)
输出功率PO:400mW (3.3V, 1%THD)
关断电流:0.1μA(典型值)
无需耦合电容、自举电容
典型应用:手机、PDA、便携式通讯设备
General Description:
The AF4890 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1 watt of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) from a 5V DC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The AF4890 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. The AF4890 features a low-power consumption shutdown mode, which is achieved by driving the shutdown pin with logic low. Additionally, the AF4890 features an internal thermal shutdown protection mechanism. The AF4890 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions. The AF4890 is unity-gain stable and can be configured by external gain-setting resistors.
Features:
■ PSRR at 217Hz, VDD = 5V (Fig. 1) 62dB(typ.)
■ Power Output at 5.0V & 1% THD 1W(typ.)
■ Power Output at 3.3V & 1% THD 400mW(typ.)
■ Shutdown Current 0.1μA(typ.)
Applications:
■ Mobile Phones
■ PDAs
■ Portable electronic devices

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