参数资料
型号: MAX9742ETX+
厂商: Maxim Integrated Products
文件页数: 21/36页
文件大小: 0K
描述: IC AMP AUDIO PWR 20.5W D 36TQFN
标准包装: 50
类型: D 类
输出类型: 2 通道(立体声)
在某负载时最大输出功率 x 通道数量: 20.5W x 2 @ 8 欧姆
电源电压: 20 V ~ 40 V,±10 V ~ 20 V
特点: 消除爆音,差分输入,静音,短路和热保护,关机
安装类型: 表面贴装
供应商设备封装: 36-TQFN 裸露焊盘(6x6)
封装/外壳: 36-WFQFN 裸露焊盘
包装: 管件
MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
28
______________________________________________________________________________________
T-Network for Low THD Performance
at Low Output Powers (Optional)
If low THD+N performance is needed at low-output pow-
ers, replace the feedback resistor (RF1) in each channel
with the T-network shown in Figure 15. The T-network
provides additional attenuation of audio band noise,
therefore, providing improved THD+N performance at
lower output powers. Use the following expressions to
select RIN1, RIN2, RF1a, RF1b, and RF2:
where AV is the desired voltage gain in V/V. To maxi-
mize CMRR and minimize gain mismatch between
channels, use the closest 1% tolerance resistor values
available for RIN1, RIN2, RF1a, RF1b, and RF2.
See the THD+N vs. Output Power With and Without
T-Network plot in the
Typical Operating Characteristics
for a comparison of the THD+N performance with and
without the optional T-network.
Output Limiting Diodes (Optional)
In applications where the output can be driven to clip-
ping, a pair of diodes around the feedback capacitor
helps reduce distortion. Clipping is most likely to hap-
pen when driving high-impedance speakers with lower
supply voltages, for example, 8 loads with a 24V sin-
gle supply. Diodes such as BAV99, a dual series silicon
switching diode, are a good choice. Connect these
diodes around the feedback capacitor as shown in
Figure 16.
R
RR
A
kk
A
683k
A
RR
R
IN1
F1a
F1b
VV
V
IN1
IN2
F2
F1a
F1b
()
=
+
=
+
=
=+
121
562
TO OUT_
CIN
RIN1
MAX9742
CIN
RIN2
TO CLASS D
MODULATOR
IN_-
IN_+
FB_
RF1a
121k
RF1b
562k
CFB_1
150pF
CFB_2
10pF
CFB_1
150pF
RF2
681k
NEGATIVE
AUDIO INPUT
POSITIVE
AUDIO INPUT
TO MID
AV =
RF1a + RF1b
RIN1
RF2 = RF1a + RF1b = 688k
RIN1 = RIN2
Figure 15. Optional T-Network for Minimizing THD+N at Low Output Powers
CFB_
TO FB_
TO IN_-
Figure 16. Connection of Output Limiting Diodes
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参数描述
MAX9742ETX+ 功能描述:音频放大器 Stereo 16W Class D Amplifier 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
MAX9742ETX+T 功能描述:音频放大器 Stereo 16W Class D Amplifier 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
MAX9742EVKIT+ 功能描述:音频放大器 Evaluation Kit for the MAX9742 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
MAX9744ETH+ 功能描述:音频放大器 Stereo 20W Class D Amplifier 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
MAX9744ETH+T 功能描述:音频放大器 Stereo 20W Class D Amplifier 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