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参数资料
| 型号： | MAX97003EWP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/48页 |
| 文件大小： | 0K |
| 描述： | IC AUDIO SUBSYSTEM LN 20WLP |
| 标准包装： | 2,500 |
| 类型： | D 类；H 类 |
| 输出类型： | 1-通道（单声道）或 2-通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 1W x 2 @ 8 欧姆 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 特点： | 消除爆音，差分输入，关闭 |
| 安装类型： | * |
| 供应商设备封装： | * |
| 封装/外壳： | * |
| 包装： | * |
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Maxim Integrated Products 27
MAX97003
High-Efficiency, Low-Noise Audio Subsystem
two small ceramic capacitors, conserving board space,
reducing cost, and improving the frequency response
of the headphone amplifier. See the Output Power vs.
Charge-Pump Capacitance and Load Resistance graph
in the Typical Operating Characteristics section for
details of the possible capacitor sizes. There is a low DC
voltage on the amplifier outputs due to amplifier offset.
However, the offset of the IC is typically Q0.15mV, which,
when combined with a 32I load, results in less than 5FA
of DC current flow to the headphones.
In addition to the cost and size disadvantages of
the DC-blocking capacitors required by conventional
headphone amplifiers, these capacitors limit the ampli-
fier’s low-frequency response and can distort the
audio signal. Previous attempts at eliminating the
output-coupling capacitors involved biasing the head-
phone return (sleeve) to the DC bias voltage of the
headphone amplifiers. This method raises a few issues:
Thesleeveistypicallygroundedtothechassis.Using
the midrail biasing approach, the sleeve must be
isolated from system ground, complicating product
design.
During an ESD strike, the amplifier’s ESD structures
are the only path to system ground. Thus, the amplifier
must be able to withstand the full energy from an ESD
strike.
Whenusingtheheadphonejackasalineouttoother
equipment, the bias voltage on the sleeve can con-
flict with the ground potential from other equipment,
resulting in possible damage to the amplifiers.
Charge Pump
The IC’s dual-mode charge pump generates both the
positive and negative power supply for the headphone
amplifier. To maximize efficiency, both the charge
pump’s switching frequency and output voltage change
based on signal level.
When the input signal level is less than 10% of VDD,
the switching frequency is reduced to a low rate. This
minimizes switching-losses in the charge pump. When
the input signal exceeds 10% of VDD, the switching fre-
quency increases to support the load current.
For input signals below 25% of VDD, the charge pump
generates Q(VDD/2) to minimize the voltage drop across
the amplifier’s power stage and thus improves efficiency.
Input signals that exceed 25% of VDD cause the charge
pump to output QVDD. The higher output voltage allows
for full output power from the headphone amplifier.
To prevent audible glitches when transitioning from the
Q
(VDD/2) output mode to the QVDD output mode, the
charge pump transitions very quickly. This quick change
draws significant current from VDD for the duration of the
transition. The bypass capacitor on VDD supplies the
required current and prevent droop on VDD.
The charge pump’s dynamic switching mode can be
turned off through the I2C interface. The charge pump
can then be forced to output either Q(VDD/2) or QVDD
regardless of input signal level.
Figure 13. Traditional Amplifier Output vs. MAX97003
DirectDrive Output
VDD
VDD/2
VOUT
GND
CONVENTIONAL DRIVER-BIASING SCHEME
+VDD
VDD/2
VOUT
-VDD
DirectDrive BIASING SCHEME
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9700AEBC | 制造商:Maxim Integrated Products 功能描述:1.2W LOW EMI FILTERLESS CLASS D - Rail/Tube |
| MAX9700AEBC+ | 制造商:Maxim Integrated Products 功能描述:AUD AMP SPKR 1CH MONO 1.6W CLS-D 12UCSP - Rail/Tube |
| MAX9700AEBC+T | 功能描述:音频放大器 1.2W L-EMI Filterles Class D Audio Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX9700AEBC-T | 功能描述:音频放大器 RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| MAX9700AETB | 制造商:Maxim Integrated Products 功能描述:1.2W, LOW EMI, FILTERLESS, CLASS D AUDIO AMPL - Rail/Tube |
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