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参数资料
| 型号： | MAX9796EBX+TG45 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO 2.3W MONO D 36UCSP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | DirectDrive® |
| 类型： | D 类 |
| 输出类型： | 1-通道（单声道），带立体声耳机 |
| 在某负载时最大输出功率 x 通道数量： | 2.3W x 1 @ 4 欧姆 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 特点： | 消除爆音，差分输入，I²C，静音，短路和热保护，关机，音量控制 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 36-UCSP |
| 封装/外壳： | 36-WFBGA，CSBGA |
| 包装： | 带卷 (TR) |
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MAX9796
2.3W, High-Power Class D Audio Subsystem
with DirectDrive Headphone Amplifiers
16
______________________________________________________________________________________
Filterless Modulation/Common-Mode Idle
The MAX9796 uses Maxim’s unique modulation scheme
that eliminates the LC filter required by traditional Class
D amplifiers, improving efficiency, reducing component
count, conserving board space and system cost.
Conventional Class D amplifiers output a 50% duty-cycle
square wave when no signal is present. With no filter, the
square wave appears across the load as a DC voltage,
resulting in finite load current, increasing power con-
sumption, especially when idling. When no signal is pre-
sent at the input of the MAX9796, the outputs switch as
shown in Figure 4. Because the MAX9796 drives the
speaker differentially, the two outputs cancel each other,
resulting in no net idle mode voltage across the speaker,
minimizing power consumption.
DirectDrive
Traditional single-supply headphone amplifiers have
outputs biased at a nominal DC voltage (typically half
the supply) for maximum dynamic range. Large cou-
pling capacitors are needed to block this DC bias from
the headphone. Without these capacitors, a significant
amount of DC current flows to the headphone, resulting
in unnecessary power dissipation and possible dam-
age to both headphone and headphone amplifier.
Maxim’s DirectDrive architecture uses a charge
pump to create an internal negative supply voltage.
This allows the headphone outputs of the MAX9796 to
be biased at GND, almost doubling dynamic range
while operating from a single supply. With no DC
component, there is no need for the large DC-block-
ing capacitors. Instead of two large (220F, typ) tan-
talum capacitors, the MAX9796 charge pump
requires two small ceramic capacitors, conserving
board space, reducing cost, and improving the fre-
quency response of the headphone amplifier. See the
Output Power vs. Load Resistance and Charge-Pump
Capacitor Size graph in the
Typical Operating
Characteristics for details of the possible capacitor
sizes. There is a low DC voltage on the driver outputs
FREQUENCY (MHz)
AMPLITUDE
(dB
μ
V/m)
40
30
60
80
100
120
140
160
180
200
220
240
260
280
300
35
30
25
20
15
10
5
EN55022B LIMIT
Figure 3. EMI with 76mm of Speaker Cable
VIN = 0V
OUT-
OUT+
VOUT+ - VOUT- = 0V
Figure 4. Outputs with No Input Signal
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9796EVKIT | 制造商:Maxim Integrated Products 功能描述:2.3W HIGH-POWER CLASS D AUDIO SUBS - Rail/Tube |
| MAX9796EVKIT+ | 制造商:Maxim Integrated Products 功能描述:MAX9796 EVAL KIT - Boxed Product (Development Kits) |
| MAX98088EVKIT# | 功能描述:音频 IC 开发工具 MAX98088 Eval Kit RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| MAX98088EVKIT+ | 功能描述:音频 IC 开发工具 MAX98088 Eval Kit RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| MAX98088EWY+T | 功能描述:接口—CODEC Dual I2S Codec RoHS:否 制造商:Texas Instruments 类型: 分辨率: 转换速率:48 kSPs 接口类型:I2C ADC 数量:2 DAC 数量:4 工作电源电压:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-81 封装:Reel |
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