集成巴黎人手机版网址芯片资料和参数

芯片型号:AF4890

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