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参数资料
| 型号： | MAX4299EWP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/14页 |
| 文件大小： | 0K |
| 描述： | IC DVR/STEREO W/MIC/REG 20-SOIC |
| 标准包装： | 1,000 |
| 类型： | PSRR 立体声驱动器 |
| 应用： | 台式音频，MP3，USB |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC W |
| 包装： | 带卷 (TR) |
MAX4298/MAX4299
Ultra-High PSRR Stereo Drivers +
Microphone Amp + 100mA Linear Regulator
8
_______________________________________________________________________________________
The amplifiers exhibit better than 115dB of DC power-
supply rejection and 93dB at 20kHz. The output ampli-
fiers are capable of driving a 1.5VRMS signal into 10kΩ
load with 0.0008% distortion. They can also drive 32Ω
headphones to 1.2VRMS with 0.02% distortion. At
+3.3V, the linear regulator can output 100mA of current.
BIAS
The common-mode bias point for the amplifiers is set to
2.25V by internal circuitry that has two functions. It pro-
vides a clickless/popless power-up/power-down wave-
form for the amplifiers. Also, it generates a ground-
referenced bias voltage with ultra-high power-supply
rejection ratio (PSRR). BIAS should be bypassed with 1F
to GND.The output impedance of the BIAS pin is 50kΩ.
Clickless/Popless Function
The MAX4298/MAX4299 are designed for high-fidelity
audio performance into AC-coupled loads. The design
techniques achieve a clickless/popless power-up
sequence, and the use of a low-current standby supply
(SVCC) or external Schottky diode/reservoir capacitor
combination allows clickless/popless power-down. A
clickless/popless mute function is also provided to main-
tain a low impedance output when the input signal is
switched off.
Mute Function
The MAX4298/MAX4299 have a MUTE pin that allows the
user to mute the outputs of the device. This feature dis-
connects the input signal from the power amplifiers when
a logic high is present at the MUTE pin. To ensure proper
functionality, the MUTE pin should always be tied to either
VCC or GND. MUTE only affects the headphone driver
outputs. REG, BIAS, and MICOUT are unaffected. OUT1
and OUT2 are muted, but remain in a low-impedance
state to ensure clickless/popless operation.
SVCC
The MAX4298/MAX4299 provide a fully clickless power-
down sequence. SVCC normally should be connected to
a low-current +5V power source, but alternatively can be
connected with a reservoir capacitor to ground and a
Schottky diode to VCC. A reservoir capacitor of 220F or
higher provides enough charge for the clickless power-
down sequence when CBIAS = 1F. For larger values of
CBIAS, increase the reservoir capacitor accordingly.
Short to VCC if clickless power-down is not needed.
Driver Amplifier
The headphone driver amplifier is a class AB amplifier
designed to drive 16Ω loads. The amplifiers have innov-
ative architectures for both the input and output stages
to achieve ultra-high PSRR while maintaining rail-to-rail
output drive capability. The output stage can drive high
capacitive loads encountered when driving long cables
used for desktop speakers or headphones.
Microphone Preamplifier (MAX4299)
The MAX4299 provides a microphone preamplifier that
is a low-power version of the audio amplifier. It is intend-
ed to be used for low-level signal amplification. This
microphone preamplifier provides rail-to-rail output with
very high PSRR.
CBYPASS
IN1
VCC
SVCC
OUT1
MUTE
OUT2
GND
MAX4298
IN2
BIAS
+
_
50k
Ω
2.25V
_
+
Figure 1. MAX4298 Block Diagram
CBYPASS
OUT1
MICIN
GND
MAX4299
MICOUT
MUTE
IN2
BIAS
IN1
1.233V
FB
VCC
SVCC
REGON
REG
18.4k
Ω
11k
Ω
50k
Ω
OUT2
N.C.
_
+
2.25V
+
_
+
_
+
_
PGND
Figure 2. MAX4299 Block Diagram
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相关代理商/技术参数 |
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| MAX4300 | 制造商:MAXIM 功能描述:SEMICONDUCTOR |
| MAX4304ESA | 功能描述:运算放大器 - 运放 740MHz Low-Noise ow-Distortion RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4304ESA+ | 功能描述:运算放大器 - 运放 740MHz Low-Noise ow-Distortion RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4304ESA+T | 功能描述:运算放大器 - 运放 740MHz Low-Noise ow-Distortion RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4304ESA-T | 功能描述:运算放大器 - 运放 740MHz Low-Noise ow-Distortion RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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