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MAX9796EBX+T

更新时间： 2024-02-01 11:37:51
品牌 Logo 应用领域
美信 - MAXIM 音频控制集成电路消费电路商用集成电路放大器信息通信管理
页数 文件大小 规格书
27页 359K
描述
2.3W, High-Power Class D Audio Subsystem with DirectDrive Headphone Amplifiers

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MAX9796EBX+T 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：BGA
包装说明：VFBGA, BGA36,6X6,20针数：36
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.75
Is Samacsys：N信道分离：75 dB
商用集成电路类型：VOLUME CONTROL CIRCUITJESD-30 代码：S-PBGA-B36
JESD-609代码：e3长度：3.06 mm
湿度敏感等级：1信道数量：2
功能数量：1端子数量：36
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：VFBGA
封装等效代码：BGA36,6X6,20封装形状：SQUARE
封装形式：GRID ARRAY, VERY THIN PROFILE, FINE PITCH峰值回流温度（摄氏度）：260
电源：3.3 V认证状态：Not Qualified
座面最大高度：0.67 mm子类别：Audio/Video Amplifiers
最大压摆率：21 mA最大供电电压 (Vsup)：5.5 V
最小供电电压 (Vsup)：2.7 V表面贴装：YES
技术：BICMOS温度等级：INDUSTRIAL
端子面层：Matte Tin (Sn)端子形式：BALL
端子节距：0.5 mm端子位置：BOTTOM
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：3.06 mm
Base Number Matches：1

MAX9796EBX+T 数据手册

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2.3W, High-Power Class D Audio Subsystem  
with DirectDrive Headphone Amplifiers  
Global Control Register  
The Global Control Register is used for global configu-  
rations, those affecting all inputs and outputs. The bits  
in the Control Register affect the inputs and outputs as  
shown in Table 11.  
Table 10. Global Control Register  
B7  
B6  
B5  
B4  
B3  
B2  
B1  
B0  
Global Control Register  
1
0
1
SHDN  
IN+6dB  
MUTE  
SSM  
MONO  
MAX796  
Table 11. Global Control Register Configurations  
BIT  
NAME  
FUNCTION  
1 = Normal operation.  
0 = Low-power shutdown mode. I C settings are saved.  
B4  
SHDN  
2
1 = All input signals are boosted by 6dB.  
0 = All input signals are passed unamplified.  
This bit does not affect INA if the INA+20dB bit (B4 of the Input Mode Control Register) is set to 1, in  
which case INA is boosted by 20dB.  
B3  
IN+6dB  
1 = Mute all outputs.  
0 = All outputs are active.  
B2  
B1  
B0  
MUTE  
SSM  
1 = Spread-spectrum Class D modulation.  
0 = Fixed-frequency Class D modulation.  
1 = Speaker outputs L+R in modes 7, 8, 12, and 13 (see Table 9).  
0 = Speaker outputs L in modes 7, 8, 12, and 13 (see Table 9).  
MONO  
speakers, voice coil movement due to the square-wave  
Applications Information  
frequency is very small. Although this movement is  
small, a speaker not designed to handle the additional  
power may be damaged. For optimum results, use a  
speaker with a series inductance >10µH. Typical 8Ω  
speakers, for portable audio applications, exhibit series  
inductances in the range of 20µH to 100µH.  
Class D Filterless Operation  
Traditional Class D amplifiers require an output filter to  
recover the audio signal from the amplifier’s PWM out-  
put. The filters add cost, increase the solution size of  
the amplifier, and can decrease efficiency. The tradi-  
tional PWM scheme uses large differential output  
Input Amplifier  
swings (2 x V  
) and causes large ripple currents.  
DD(P-P)  
Any parasitic resistance in the filter components results  
in a loss of power, lowering the efficiency.  
Differential Input  
The MAX9796 features a programmable differential  
input structure, making it compatible with many  
CODECs, and offering improved noise immunity over a  
single-ended input amplifier. In devices such as cellu-  
lar phones, high-frequency signals from the RF trans-  
mitter can be picked up by the amplifier’s input traces.  
The signals appear at the amplifier’s inputs as com-  
mon-mode noise. A differential input amplifier amplifies  
the difference of the two inputs and any signal common  
to both is cancelled.  
The MAX9796 does not require an output filter. The  
device relies on the inherent inductance of the speaker  
coil and the natural filtering of both the speaker and the  
human ear to recover the audio component of the  
square-wave output. Eliminating the output filter results  
in a smaller, less costly, more efficient solution.  
Because the switching frequency of the MAX9796  
speaker output is well beyond the bandwidth of most  
24 ______________________________________________________________________________________  
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