CIN BOOT- OUT- IN VOLUME CONTROL 9.5dB (max) CLASS D 20dB FB
參數(shù)資料
型號(hào)： MAX9744ETH+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 15/28頁(yè)
文件大小： 0K
描述： IC AMP AUDIO PWR 22.5W D 44TQFN
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 1
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： 22.5W x 2 @ 4 歐姆
電源電壓： 4.5 V ~ 14 V
特點(diǎn)： 消除爆音，靜音，短路和熱保護(hù)，關(guān)機(jī)，音量控制
安裝類型： 表面貼裝
供應(yīng)商設(shè)備封裝： 44-TQFN-EP（7x7）
封裝/外殼： 44-WFQFN 裸露焊盤(pán)
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： MAX9744ETH+TDKR
BOOT+
OUT+
AUDIO
INPUT
MAX9744
CIN
BOOT-
OUT-
IN
VOLUME
CONTROL
9.5dB (max)
CLASS
D
20dB
FB
RIN
RF
Figure 9. Setting Gain
GND
MAX9744
SHDN
OUT
3.3V
VDD
PVDD
IN
1
μF
MAX1615
4.5V TO 14.5V
1
μF
Figure 10. Using a Linear Regulator to Produce 3.3V from a
Higher Power Supply
MAX9744
20W Stereo Class D Speaker Amplifier
with Volume Control
22
______________________________________________________________________________________
Component Selection
Gain-Setting Resistors
External feedback resistors set the gain of the
MAX9744. The output stage has an internal 20dB gain
in addition to the externally set input stage gain. Set the
maximum gain by using resistors RF and RIN (Figure 9)
as follows:
Choose RF between 10kΩ and 50kΩ. Note that the
actual gain of the amplifier is dependent on the volume
level setting. For example, with the volume set to
+9.5dB, the amplifier gain would be 9.5dB plus 20dB,
assuming RIN = RF.
The input amplifier can be configured into a variety of
circuits. The FB terminal is an actual operational ampli-
fier output, allowing the MAX9744 to be configured as a
summing amplifier, a filter, or an equalizer, for example.
Input Capacitor
An input capacitor (CIN) in conjunction with the input
impedance of the MAX9744 form a highpass filter that
removes the DC bias from an incoming signal. The AC-
coupling capacitor allows the amplifier to automatically
bias the signal to an optimum DC level. Assuming zero
source impedance, the -3dB point of the highpass filter
is given by:
Choose CIN that f-3dB is well below the lowest frequen-
cy of interest. Use capacitors whose dielectrics have
low-voltage coefficients, such as tantalum or aluminum
electrolytic. Capacitors with high-voltage coefficients,
such as ceramics, may result in increased distortion at
low frequencies.
DC-Coupled Input
The input amplifier can accept DC-coupled inputs that
are biased to the amplifier’s bias voltage. DC-coupling
eliminates input-coupling capacitors, reducing compo-
nent count to potentially one external component. In this
configuration the highpass filtering effect of the capacitors
is lost, allowing low-frequency signals to be amplified.
Power Supplies
The MAX9744 features separate supplies for each por-
tion of the device, allowing for the optimum combination
of headroom power dissipation and noise immunity. The
speaker amplifier is powered from PVDD and can range
from 4.5V to 14V. The remainder of the device is pow-
ered by VDD. Power supplies are independent of each
other so sequencing is not necessary. Power may be
supplied by separate sources or derived from a single
higher source using a linear regulator (Figure 10).
BIAS Capacitor
BIAS is the output of the internally generated DC bias
voltage. The BIAS bypass capacitor, CBIAS, improves
PSRR and THD+N by reducing power supply and other
noise sources at the common-mode bias node, and
also generates the clickless/popless, startup/shutdown,
DC bias waveforms for the speaker amplifiers. Bypass
BIAS with a 2.2F capacitor to GND.
f
RC
dB
IN IN
=
3
1
2
π
A
R
VV
V
F
IN
=
30
/
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
MAX974CPE 功能描述:校驗(yàn)器 IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
MAX974CPE+ 功能描述:校驗(yàn)器 IC Dual Comparator / Reference RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
MAX974CSE 功能描述:校驗(yàn)器 IC RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
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