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| 型号： | MAX9791CETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/34页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO 2.2W STER D 28WQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | DirectDrive® |
| 类型： | D 类 |
| 输出类型： | 2-通道（立体声）带立体声耳机和超低音器 |
| 在某负载时最大输出功率 x 通道数量： | 2.2W x 2 @ 4 欧姆; 180mW x 2 @ 32 欧姆 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 特点： | 消除爆音，LDO，短路保护和热保护，关机 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
24
______________________________________________________________________________________
Setting Speaker Amplifier Gain
External input resistors in conjunction with the internal
feedback resistors (RFSPKR) set the speaker amplifier
gain of the MAX9791/MAX9792. Set gain by using
resistor RIN1 as follows (Figure 9):
where AVSPKR is the desired voltage gain. An RIN1 of
20k
yields a gain of 4V/V, or 12dB.
Component Selection
Optional Ferrite Bead Filter
In applications where speaker leads exceed 15cm, use
a filter constructed from a ferrite bead and a capacitor
to ground (Figure 10) to provide additional EMI sup-
pression. Use a ferrite bead with low DC resistance,
high frequency (> 1.2MHz) impedance of 100
to
600
, and rated for at least 1A. The capacitor value
varies based on the ferrite bead chosen and the actual
speaker lead length. Select the capacitor value based
on EMI performance.
Output Power (Headphone Amplifier)
The headphone amplifiers are specified for the worst-
case scenario when both inputs are in phase. Under
this condition, the drivers simultaneously draw current
from the charge pump, leading to a slight loss in head-
room of CPVSS. In typical stereo audio applications, the
left and right signals have differences in both magni-
tude and phase, subsequently leading to an increase in
the maximum attainable output power. Figure 11 shows
the two extreme cases for in and out of phase. In most
cases, the available power lies between these
extremes.
Headphone Amplifier Gain
Gain-Setting Resistors
External input resistors in conjunction with the internal
feedback resistors (RFHP) set the headphone amplifier
gain of the MAX9791/MAX9792. Set gain by using
resistor RIN2 (Figure 4) as follows:
where AVHP is the desired voltage gain. An RIN2 of
40.2k
yields a gain of 1V/V, or 0dB.
Power Supplies
The MAX9791/MAX9792 speaker amplifiers are pow-
ered from PVDD with a range from 2.7V to 5.5V. The
headphone amplifiers are powered from HPVDD and
CPVSS. HPVDD is the positive supply of the headphone
amplifiers and charge pump ranging from 2.7V to 5.5V.
CPVSS is the negative supply of the headphone ampli-
fiers. The charge pump inverts the voltage at HPVDD,
and the resulting voltage appears at CPVSS. AVDD
powers the LDO and the remainder of the device.
AVDD and PVDD must be tied together. If LDO is
enabled, set AVDD and PVDD as specified in the Line
Regulation row of the
Electrical Characteristics table.
A
k
R
VV
VHP
IN
=
-
40 2
2
.
/
A
k
R
VV
VSPKR
IN
=
-4
20
1
/
MAX9791
MAX9792
L1*
L2*
330pF
*L1 = L2 = WRTH 742792040
Figure 10. Optional Ferrite Bead Filter
TOTAL HARMONIC DISTORTION + NOISE
vs. OUTPUT POWER (HEADPHONE MODE)
OUTPUT POWER (mW)
THD+N
(%)
200
150
100
50
0.01
0.1
1
10
100
0.001
0
250
RL = 32
OUT OF PHASE
IN PHASE
Figure 11. Output Power vs. Supply Voltage with Inputs In/Out
of Phase; 32
Load Conditions and 3.5dB Gain
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9792AETI+ | 功能描述:音频放大器 Windows Vista Class D Speaker 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 |
| MAX9792AETI+T | 功能描述:音频放大器 Windows Vista Class D Speaker 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 |
| MAX9792AEVKIT+ | 功能描述:音频放大器 Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers 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 |
| MAX9792CETI+ | 功能描述:音频放大器 Windows Vista Class D Speaker 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 |
| MAX9792CETI+T | 功能描述:音频放大器 Windows Vista Class D Speaker 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 |
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