TI INA1620高保真音频运算放大器解决方案

TI公司的INA1620是集成了精密匹配的薄膜电阻对和EMI滤波器的高保真音频运算放大器,具有低失真高输出电流两个音频运算放大器.放大器的低噪音密度为2.8-nV/√Hz,1 kHz的THD+N为-119.2dB,150mW输出功率时能驱动32-Ω负载.集成的薄膜电阻匹配度在0.004%内,可以用来创建大量的非常高性能的音频电路.INA1620工作电压±2 V 到 ±18 V,每路电流仅为2.6mA.它的关断模式使放大器的待机电流小于5 μA.放大器增益带宽为21MHz(G=+1000),转换速率为10 V/μs,电容负载驱动能力大于600 pF,600-Ω负载时的开路增益为136dB,器件的工作温度从–40℃ 到+125℃.主要用在高保真(HiFi)耳机驱动器,专业音频设备,模拟和数字混合控制台,音频测试和测量.本文介绍了INA1620主要特性,功能框图和耳机放大器应用电路,专业麦克风预放大器电路以及音频放大器评估模块INA1620 EVM主要特性,电路图,材料清单和PCB设计图.
The INA1620 integrates 4 precision-matched thin-filmresistor pairs and EMI filtering on-chip with a lowdistortion,high output current, dual audio operationalamplifier. The amplifier achieves a very low,2.8-nV/√Hz noise density with an ultra-low THD+N of–119.2 dB at 1 kHz and drives a 32-Ω load at 150-mW output power. The integrated thin-film resistorsare matched to within 0.004% and can be used tocreate a large number of very high-performanceaudio circuits.
The INA1620 operates over a very wide supply rangeof ±2 V to ±18 V on only 2.6 mA of supply current perchannel. The INA1620 also has a shutdown mode,allowing the amplifiers to be switched from normaloperation to a standby current that is typically less　than 5 μA. Shutdown mode is specifically designed toeliminate click-and-pop noise when transitioning intoor out of shutdown mode.
The INA1620 has a unique internal layout for lowestcrosstalk, and freedom from interactions betweenchannels, even when overdriven or overloaded. Thisdevice is specified from –40℃ to +125℃.
The INA1620 integrates a dual, bipolar-input, audio operational amplifier with four high-precision thin-film resistorpairs on the same die. The internal amplifiers and resistor pairs are pinned out to allow for many cir...