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参数资料
| 型号： | MAX9767ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/33页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO .75W STER AB 32TQFN |
| 标准包装： | 60 |
| 类型： | AB 类 |
| 输出类型： | 2 通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 750mW x 2 @ 4 欧姆 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 特点： | 消除爆音，麦克风，静音，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： | 32-TQFN-EP（5x5） |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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MAX9765/MAX9766/MAX9767
750mW Audio Amplifiers with Headphone Amp,
Microphone Preamp, and Input Mux
22
______________________________________________________________________________________
I2C Compatibility
The MAX9765/MAX9766 are compatible with existing I2C
systems. SCL and SDA are high-impedance inputs; SDA
has an open drain that pulls the data line low during the
ninth clock pulse. The communication protocol supports
the standard I2C 8-bit communications. The general call
address is ignored. The MAX9765/MAX9766 addresses
are compatible with the 7-bit I2C addressing protocol
only. No 10-bit formats are supported.
Applications Information
BTL Amplifiers
The MAX9765/MAX9766/MAX9767 feature speaker
amplifiers designed to drive a load differentially, a con-
figuration referred to as bridge-tied load (BTL). The BTL
configuration (Figure 8) offers advantages over the sin-
gle-ended configuration, where one side of the load is
connected to ground. Driving the load differentially
doubles the output voltage compared to a single-
ended amplifier under similar conditions. Thus, the
devices’ differential gain is twice the closed-loop gain
of the input amplifier. The effective gain is given by:
Substituting 2 x VOUT(P-P) for VOUT(P-P) into the follow-
ing equations yields four times the output power due to
doubling of the output voltage:
Since the outputs are differential, there is no net DC
voltage across the load. This eliminates the need for
DC-blocking capacitors required for single-ended
amplifiers. These capacitors can be large, expensive,
consume board space, and degrade low-frequency
performance.
Single-Ended Headphone Amplifier
The MAX9765/MAX9766 can be configured as single-
ended headphone amplifiers through software or by
sensing the presence of a headphone plug (HPS). In
headphone mode, the inverting output of the BTL
amplifier is disabled, muting the speaker. The gain is
1/2 that of the device in speaker mode, and the output
power is reduced by a factor of 4.
In headphone mode, the load must be capacitively
coupled to the device, blocking the DC bias voltage
from the load (see the Typical Application Circuit and
the Output-Coupling Capacitor section).
Microphone Amplifiers
Differential Microphone Amplifier
The MAX9765/MAX9766/MAX9767 feature a low-noise,
high CMRR, differential input microphone amplifier. The
differential input structure is almost essential in noisy
digital systems where amplification of low-amplitude
analog signals is necessary such as notebooks and
PDAs. When properly employed, the differential input
architecture offers the following advantages:
V
P
V
R
RMS
OUT P P
OUT
RMS
L
=
()
22
2
A
R
VD
F
IN
=×
2
MG2
MG1
MG0
MAX9765
DIFF GAIN (dB)
MAX9766
DIFF GAIN (dB)
SINGLE-ENDED GAIN
(dB)
0*
4
10
0
1
9
15
01
0
14
20
01
1
19
25
10
0
24
30
29
10
1
29
35
34
11
0
34
40
36
11
1
39
45
40
Table 6. Microphone Gain Setting
*Default state.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9767ETJ+ | 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 |
| MAX9767ETJ+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 |
| MAX9767ETJ-T | 功能描述:音频放大器 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 |
| MAX9768BETG+ | 功能描述:音频放大器 10W Mono Class D Speaker 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 |
| MAX9768BETG+T | 功能描述:音频放大器 10W Mono Class D Speaker 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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