參數(shù)資料
型號(hào)： MAX9742ETX+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 9/36頁(yè)
文件大?。?/td> 0K
描述： IC AMP AUDIO PWR 20.5W D 36TQFN
標(biāo)準(zhǔn)包裝： 2,500
類型： D 類
輸出類型： 2 通道（立體聲）
在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： 20.5W x 2 @ 8 歐姆
電源電壓： 20 V ~ 40 V，±10 V ~ 20 V
特點(diǎn)： 消除爆音，差分輸入，靜音，短路和熱保護(hù)，關(guān)機(jī)
安裝類型： 表面貼裝
供應(yīng)商設(shè)備封裝： 36-TQFN 裸露焊盤（6x6）
封裝/外殼： 36-WFQFN 裸露焊盤
包裝： 帶卷 (TR)
MAX9742
Single-/Dual-Supply, Stereo 16W,
Class D Amplifier with Differential Inputs
______________________________________________________________________________________
17
to-peak output voltage that causes 10% THD+N for a
given load.
where POUT_10% is the output power that causes 10%
THD+N, RL is the load resistance, and VOUT_P-P is the
peak-to-peak output voltage. Determine the voltage
gain (AV) necessary to attain this output voltage based
on the maximum peak-to-peak input voltage (VIN_P-P):
Set the closed-loop voltage gain of the MAX9742 less
than or equal to AV to prevent clipping of the output,
unless audible clipping is acceptable for the application.
Input Amplifier
The external feedback networks of the MAX9742 input
amplifiers allow custom gain settings while maximizing
dynamic range. The input amplifiers also accommodate
a variety of standard amplifier configurations including
differential input, single-ended input, and summing
amplifiers. Due to the output current limitations of the
internal input amplifiers, always select feedback resistors
(RF1, see the Typical Application Circuits/Functional
Diagrams) with values greater than or equal to 400k. To
preserve gain accuracy, avoid using feedback resistors
with values greater than 1M. For proper operation, limit
common-mode input voltages to ±3V.
Differential Input Configuration
The
Typical Application Circuits/Functional Diagrams
show each channel of the MAX9742 configured as dif-
ferential input amplifiers. A differential input offers
improved noise immunity over a single-ended input. In
systems that include high-speed digital circuitry, high-
frequency noise can couple into the amplifier’s input
traces. The signals appear at the amplifier’s inputs as
common-mode noise. A differential input amplifier
amplifies the difference of the two inputs, and signals
common to both inputs are subtracted out. When con-
figured for differential inputs, the voltage gain of the
MAX9742 is set by:
where AV is the desired voltage gain in V/V. RIN1
should be equal to RIN2, and RF1 should be equal to
RF2.
When using the differential input configuration, the
common-mode rejection ratio (CMRR) is primarily limit-
ed by the external resistor tolerances. Ideally, to
achieve the highest possible CMRR, the resistors
should be perfectly matched and the following condi-
tion should be met:
To ensure the MAX9742 input amplifiers operate as
fully differential integrators, connect a capacitor
between IN_+ and MID whose value is equal to CF (see
the
Feedback Capacitor (CFB_) section).
Single-Ended Input
Each channel of the MAX9742 can be configured as a
single-ended input amplifier by connecting IN_+ to MID
(through an external resistor, ROS) and driving IN_- with
the input source (see Figure 5). In this configuration,
the MAX9742 is configured as a single-ended amplifier
whose voltage gain is equal to:
where AV is the desired voltage gain in V/V.
To minimize output offset voltages due to input bias cur-
rents, connect a resistor, ROS, (see Figure 5) between
IN_+ and MID. Select the value of ROS so that the DC
resistances looking out of inputs of the amplifier (IN_+
and IN_-) are equal. For example, when using the dual-
supply configuration with a DC-coupled input source, the
value of ROS should be equal to RF||RIN.
A
R
V
F
IN
(/ )
=
VV
R
F1
IN1
F2
IN2
=
A
R
V
F1
IN1
=
( / )
VV
A
V
OUT_P P
IN_P P
(/ )
=
VV
V2
2 P
R
OUT_P P
OUT_10%
L
=×
() ()
V
OUT_
VIN
CIN
RIN
ROS
MAX9742
MID
TO CLASS D
MODULATOR
RF
IN_-
IN_+
CFB_
FB_
Figure 5. Single-Ended Input Configuration
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX9742EVKIT+ 功能描述:音頻放大器 Evaluation Kit for the MAX9742 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9744ETH+ 功能描述:音頻放大器 Stereo 20W Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9744ETH+T 功能描述:音頻放大器 Stereo 20W Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9744EVCMAXQU+ 功能描述:音頻放大器 Evaluation Kit/Evaluation System for the MAX9744 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9744EVKIT+ 功能描述:音頻放大器 Evaluation Kit/Evaluation System for the MAX9744 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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