参数资料
型号: MAX9756ETX+
厂商: Maxim Integrated Products
文件页数: 8/31页
文件大小: 0K
描述: IC AMP AUDIO PWR 2.3W AB 36TQFN
标准包装: 50
系列: DirectDrive®
类型: AB 类
输出类型: 2-通道(立体声)带立体声耳机
在某负载时最大输出功率 x 通道数量: 2.3W x 2 @ 3 欧姆; 130mW x 2 @ 16 欧姆
电源电压: 4.5 V ~ 5.5 V
特点: 消除爆音,短路保护和热保护,关机,音量控制
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
MAX9756/MAX9757/MAX9758
The release/attack time ratio that can be achieved by
programming DR is listed in Table 2.
Output Power Threshold
To set the threshold at which speaker output is
clamped, an external resistor must be connected from
PREF to ground. The suggested external resistor range
is from 100k
to 200k (for best results use a 1% resis-
tor). Leaving PREF unconnected disables the ALC
function. A constant current of 12A is sourced at
PREF, so that a 180k
resistor results in 1.2W clamp
limit on an 8
load and a 200k resistor results in a
1.5W clamp limit on an 8
load (Figure 6).
Use the following equation to choose the value for
RPREF for the desired maximum output power level
based on a sine wave input:
Gain Selection
The MAX9756/MAX9757/MAX9758 feature an internally
set, selectable gain. The GAIN1, GAIN2, and GAIN3
inputs set the maximum gain for the speaker and head-
phone amplifiers (Table 3). The gain of the device can
vary based upon the voltage at VOL but does not
exceed the maximum gain listed below (see the Analog
Volume (VOL) Control section).
Rk
PR
PREF
OUT
L
=
×
180
1 166
8
.
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
16
______________________________________________________________________________________
MAX9756
MAX9757
33nF
180k
VALUES SHOWN FOR AN OUTPUT POWER THRESHOLD OF 1.2W WITH AN
RL = 8
ATTACK TIME OF 495s AND A RELEASE TIME OF 990ms
DR
5V
VDD
CT
PREF
Figure 5. Recommended Output Power Threshold, Attack, and
Release Time Components
OUTPUT POWER THRESHOLD
vs. RPREF
RPREF (k
)
OUTPUT
POWER
THRESHOLD
(W)
190
180
170
160
150
140
130
120
110
0.5
1.0
1.5
2.0
2.5
3.0
0
100
200
RL = 4
RL = 8
Figure 6. Output Power Threshold vs. RPREF
Table 2. Release to Attack Ratio
DR
RELEASE/ATTACK RATIO
VDD
200
VBIAS
633
GND
2000
Table 3. Maximum Gain Settings
GAIN3
GAIN2
GAIN1
SPEAKER MODE GAIN (dB)
HEADPHONE MODE GAIN (dB)
0
+15
0
1
+16.5
0
1
0
+18
+3
0
1
+19.5
+3
1
0
+21
0
1
0
1
+22.5
0
1
0
+24
+3
1
+25.5
+3
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MAX9756ETX+ 功能描述:音频放大器 Integrated Circuits (ICs) 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
MAX9756ETX+T 功能描述:音频放大器 Integrated Circuits (ICs) 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
MAX9756EVKIT 功能描述:放大器 IC 开发工具 Programmers, Development Systems RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V
MAX9757ETJ+ 功能描述:音频放大器 Integrated Circuits (ICs) 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
MAX9757ETJ+T 功能描述:音频放大器 Integrated Circuits (ICs) 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