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| 型号： | MAX9756ETX+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/31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 |
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MAX9756/MAX9757/MAX9758
Since the volume control (VOL) ADC is ratiometric to
HPVDD, any variations in HPVDD are negated. The gain
step sizes are not constant; the step sizes are
0.5dB/step at the upper extreme, 2dB/step in the
midrange, and 4dB/step at the lower extreme. Figure 8
shows the transfer function of the volume control for a
3.3V supply.
Low-Dropout Linear Regulator
The MAX9756/MAX9758s’ low-dropout linear regulator
(LDO) can be used to provide a clean power supply to
a CODEC or other circuitry. The LDO can be enabled
independently of the audio amplifiers. REGEN
enables/disables the LDO, set REGEN = VDD to enable
the LDO or set REGEN = GND to disable. The LDO is
capable of providing up to 150mA continuous current
and features Maxim’s Dual Mode feedback. When SET
is connected to GND, the output is internally set to
approximately 4.65V. Adjust the output from 1.23V to
5V by connecting two external resistors, used as a volt-
age-divider, at SET (Figure 9).
The output voltage is set by the following equation:
where VSET = 1.23V.
To simplify resistor selection:
Since the input bias current at SET is nominally zero,
large resistance values can be used for R1 and R2 to
minimize power consumption without losing accuracy.
Up to 1.5M
is acceptable for R2.
To minimize the current consumption, it is desirable to
use high-value resistors (> 10k
for the external feed-
back divider (R1, R2). The input capacitance at SET
and the stray and wiring capacitance should be com-
pensated by placing a small capacitor (in the 10pF
range) across the upper feedback resistor R1 (see
Figure 9).
This capacitor creates a zero in the feedback loop to
reduce overshoot. Overcompensation can cause poor
stability in the high current range.
The regulator should be compensated with two 1F
ceramic capacitors connected between IN and GND
and OUT and GND. X7R dielectric with 10% tolerance
is recommended.
The ESR of each capacitor should not exceed 40m
for good stability up to the full-rated current (150mA).
Place the capacitors as close as possible to the device
to limit the parasitic resistance and inductance. There
is no upper limit to the amount of additional bypass
capacitance.
DirectDrive Headphone Amplifier
Unlike the MAX9756/MAX9757/MAX9758, conventional
single-supply headphone amplifiers typically have their
outputs biased at half the supply voltage for maximum
dynamic range. Large coupling capacitors are needed
to block this DC bias from the headphones. Without
these capacitors, a significant amount of DC current
flows to the headphone, resulting in unnecessary
power dissipation and possible damage to both head-
phone and headphone amplifier.
RR
V
OUT
SET
12
1
=
VV
R
OUT
SET
=+
1
2
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
18
______________________________________________________________________________________
Figure 8. Volume Control Transfer Function
VOLUME CONTROL TRANSFER FUNCTION
VVOL (V)
GAIN
(dB)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
-60
-40
-20
0
20
40
-80
0
4.0
GAIN1 = GAIN2 = GAIN3 = 1
HPVDD = 3.3V
SPEAKER MODE
HEADPHONE MODE
Figure 9. Adjustable Output Using External Feedback Resistors
MAX9756
MAX9758
OUT
SET
GND
1
F
1
F
10pF
R1
R2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
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