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LM49450

更新时间： 2024-02-22 02:36:55
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
42页 1037K
描述
Boomer I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-System with Ground Referenced Headphone Amplifier, 3D Enhancement, and Headphone Sense

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LM49450 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Active包装说明：HVQCCN, LCC28,.2SQ,20
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01Factory Lead Time：8 weeks
风险等级：5.48商用集成电路类型：AUDIO AMPLIFIER
JESD-30 代码：S-PQCC-N32JESD-609代码：e3
长度：5 mm湿度敏感等级：1
功能数量：2端子数量：28
最高工作温度：85 °C最低工作温度：-40 °C
封装主体材料：PLASTIC/EPOXY封装代码：HVQCCN
封装等效代码：LCC28,.2SQ,20封装形状：SQUARE
封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度（摄氏度）：260
电源：3.6/5 V认证状态：Not Qualified
筛选级别：AEC-Q100座面最大高度：0.8 mm
子类别：Audio/Video Amplifiers最大供电电压 (Vsup)：5.5 V
表面贴装：YES温度等级：INDUSTRIAL
端子面层：Matte Tin (Sn)端子形式：NO LEAD
端子节距：0.5 mm端子位置：QUAD
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：5 mm
Base Number Matches：1

LM49450 数据手册

 浏览型号LM49450的Datasheet PDF文件第33页浏览型号LM49450的Datasheet PDF文件第34页浏览型号LM49450的Datasheet PDF文件第35页浏览型号LM49450的Datasheet PDF文件第37页浏览型号LM49450的Datasheet PDF文件第38页浏览型号LM49450的Datasheet PDF文件第39页 
LM49450  
SNAS440D –FEBRUARY 2008–REVISED MAY 2013  
www.ti.com  
DAC COMPENSATION FILTER REGISTERS (0x09h to 0x0Eh)  
DAC Compensation Filter  
The LM49450 DAC features a 5 band FIR filter that can be used as an equalizer for the digital audio path.  
Registers 0x09h, 0x0Ah, 0x0Bh, 0x0Ch, 0x0Dh, and 0x0Eh provide an 8-bit control for each individual FIR filter.  
EXTERNAL COMPONENT SELECTION  
The LM49450 uses different supplies for each portion of the device, allowing for the optimum combination of  
headroom, power dissipation and noise immunity. The speaker amplifier gain stage is powered from VDD, while  
the output stage is powered from LSVDD. The headphone amplifiers, input amplifiers and volume control stages  
are powered from HPVDD. The separate power supplies allow the speakers to operate from a higher voltage for  
maximum headroom, while the headphones operate from a lower voltage, improving power dissipation. HPVDD  
may be driven by a linear regulator to further improve performance in noisy environments. The I2C portion if  
powered from I2CVDD, allowing the I2C portion of the LM49450 to interface with lower voltage digital controllers.  
PROPER SELECTION OF EXTERNAL COMPONENTS  
Power Supply Bypassing and Filtering  
Proper power supply bypassing is critical for low noise performance and high PSRR. Place the supply bypass  
capacitors as close to the device as possible. Typical applications employ a voltage regulator with 10µF and  
0.1µF bypass capacitors that increase supply stability. These capacitors do not eliminate the need for bypassing  
of the LM49450 supply pins. A 1µF ceramic capacitor placed close to each supply pin is recommended.  
Bypass Capacitor Selection  
The LM49450 internally generates a VDD/2 common-mode bias voltage. The BYPASS capacitor CBYPASS,  
improves PSRR and THD+N by reducing noise at the BYPASS node. Use a 2.2µF ceramic placed as close to  
the device as possible.  
REF Capacitor Selection  
The LM49450 generates an internal low noise reference voltage used by the DAC. For best THD+N  
performance, bypass REF with 10µF and 0.1µF ceramic capacitors.  
Charge Pump Capacitor Selection  
Use low ESR ceramic capacitors (less than 100mΩ) for optimum performance.  
Charge Pump Flying Capacitor (C1)  
The flying capacitor (C1) affects the load regulation and output impedance of the charge pump. A C1 value that  
is too low results in a loss of current drive, leading to a loss of amplifier headroom. A higher valued C1 improves  
load regulation and lowers charge pump output impedance to an extent. Above 2.2µF, the RDS(ON) of the charge  
pump switches and the ESR of C1 and C2 dominate the output impedance. A lower value capacitor can be used  
in systems where low maximum output power requirements.  
Charge Pump Hold Capacitor (C2)  
The value and ESR of the hold capacitor (C2) directly affects the ripple on CPVSS. Increasing the value of C2  
reduces output ripple. Decreasing the ESR of C2 reduces both output ripple and charge pump output impedance.  
A lower value capacitor can be used in systems where low maximum output power requirements.  
Input Capacitor Selection  
The LM49450 analog inputs require input coupling capacitors. Input capacitors block the DC component of the  
audio signal, eliminating any conflict between the DC component of the audio source and the bias voltage of the  
LM49450. The input capacitors create a high-pass filter with the input resistors RIN. The -3dB point of the high  
pass filter is found using Equation 1 below.  
36  
Submit Documentation Feedback  
Copyright © 2008–2013, Texas Instruments Incorporated  
Product Folder Links: LM49450  
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