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| 型号： | MAX9767ETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/33页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO .75W STER AB 32TQFN |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
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MAX9765/MAX9766/MAX9767
750mW Audio Amplifiers with Headphone Amp,
Microphone Preamp, and Input Mux
16
______________________________________________________________________________________
Detailed Description
The MAX9765/MAX9766/MAX9767 feature 750mW BTL
speaker amplifiers, 65mW headphone amplifiers, input
multiplexers, headphone sensing, differential and sin-
gle-ended input microphone amplifiers, and compre-
hensive click-and-pop suppression. The MAX9765/
MAX9766 are controlled through an I2C-compatible, 2-
wire serial interface. The MAX9767 is controlled
through three logic inputs: MUTE, SHDN, INT (see the
Selector Guide). The MAX9765 family features excep-
tional PSRR (95dB at 1kHz), allowing these devices to
operate from noisy digital supplies without the need for
a linear regulator.
The speaker amplifiers use a BTL configuration. The
MAX9765/MAX9766 main amplifiers are composed of
an input amplifier and an output amplifier. Resistor RIN
sets the input amplifier’s gain, and resistor RF sets the
output amplifier’s gain. The output of these two ampli-
fiers serves as the input to a slave amplifier configured
as an inverting unity-gain follower. This results in two
outputs, identical in magnitude, but 180° out of phase.
The overall gain of the speaker amplifiers is twice the
product of the two amplifier gains (see the Gain-Setting
Resistor section). A unique feature of this architecture
is that there is no phase inversion from input to output.
The MAX9767 does not use a two-stage input amplifier
and therefore has phase inversion from input to output.
When configured as a headphone (single-ended) ampli-
fier, the slave amplifier is disabled, muting the speaker
and the main amplifier drives the headphone. The
MAX9765/MAX9766/MAX9767 can deliver 700mW of
continuous average power into a 4 load with less than
1% THD+N in speaker mode. The MAX9765/MAX9766
can deliver 70mW of continuous average power into a
16 load with less than 1% THD+N in headphone
mode. The speaker amplifiers also feature thermal-
overload and short-circuit current protection.
All devices feature microphone amplifiers with both dif-
ferential and single-ended inputs. Differential input is
intended for use with internal microphones. Single-
ended input is intended for use with external (auxiliary)
microphones. The differential input configuration is par-
ticularly effective when layout constraints force the
microphone amplifier to be physically remote from the
ECM microphone and/or the rest of the audio circuitry.
The MAX9766/MAX9767 feature a complementary out-
put, creating an ideal interface with CODECs and other
devices with differential inputs. All devices also feature
an internal microphone bias generator.
Amplifier Common-Mode Bias
These devices feature an internally generated com-
mon-mode bias voltage of 1.5V referenced to GND.
BIAS provides both click-and-pop suppression and
sets the DC bias level for the audio signal. BIAS is inter-
nally connected to the noninverting input of each
speaker amplifier (see the Typical Application Circuit).
Choose the value of the bypass capacitor as described
in the BIAS Capacitor section.
Input Multiplexer
The MAX9765/MAX9766 feature a 2:1 input multiplexer
on the front end of each amplifier. The multiplexer is
controlled by bit 1 in the control register. A logic low
Pin Description (continued)
PIN
MAX9765
MAX9766
MAX9767
NAME
FUNCTION
—19
17
MICOUT-
Microphone Amplifier Negative Output
—
23
—
GAINM
Mono Mode Gain Set
—
9
INL
Left-Channel Input
——
25
INT/EXT
Internal (Differential) or External (Single-Ended) Input Select. Drive
INT/EXT
low to select internal or high to select external microphone amplifier.
——
26
MICGAIN
Microphone Amplifier Gain Set. Tri-State Pin. Connect to VDD for gain = 10dB,
float for gain = 20dB, and to GND for gain = 30dB.
—
28
INR
Right-Channel Input
—
30
MUTE
Mute Input
—
EP
Exposed Pad. Connect to ground plane of PC board to optimize heatsinking.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX9768ETG+ | 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 |
| MAX9768ETG+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 |
| MAX9768EVCMAXQU+ | 功能描述:音频放大器 Evaluation Kit/Evaluation System for the MAX9768 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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