參數(shù)資料
型號(hào)： MAX9765ETJ+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 9/33頁(yè)
文件大?。?/td> 0K
描述： IC AMP AUDIO .75W STER AB 32TQFN
標(biāo)準(zhǔn)包裝： 60
類(lèi)型： AB 類(lèi)
輸出類(lèi)型： 2-通道（立體聲）帶立體聲耳機(jī)
在某負(fù)載時(shí)最大輸出功率 x 通道數(shù)量： 750mW x 2 @ 4 歐姆; 65mW x 2 @ 16 歐姆
電源電壓： 2.7 V ~ 5.5 V
特點(diǎn)： 消除爆音，I²C，輸入多路復(fù)用器，麥克風(fēng)，靜音，短路和熱保護(hù)，關(guān)機(jī)
安裝類(lèi)型： 表面貼裝
供應(yīng)商設(shè)備封裝： 32-TQFN-EP（5x5）
封裝/外殼： 32-WFQFN 裸露焊盤(pán)
包裝： 管件
MAX9765/MAX9766/MAX9767
750mW Audio Amplifiers with Headphone Amp,
Microphone Preamp, and Input Mux
______________________________________________________________________________________
17
selects input IN_1 and a logic high selects input IN_2.
Both right- and left-channel multiplexers are controlled
by the same input.
The input multiplexer can also be used to further
expand the number of gain options available from the
MAX9765/MAX9766. Connect the audio source to the
device through two different input resistors for multiple
gain configurations (Figure 1). Additionally, the input
multiplexer allows a speaker equalization network to be
switched into the speaker signal path. This is typically
useful in optimizing acoustic response from speakers
with small physical dimensions.
Mono Mode
The mono MAX9766 incorporates a mixer/attenuator
(see the Functional Diagram). In speaker (mono) mode,
the mixer/attenuator combines the two stereo inputs
(INL_ and INR_) and attenuates the resultant signal by
a factor of 2. This allows for full reproduction of a stereo
signal through a single speaker while maintaining opti-
mum headroom. The resistor connected between
GAINM and OUTL+ sets the device gain in speaker
mode. This allows the speaker amplifier to have a dif-
ferent gain and feedback network from the headphone
amplifier.
Headphone Sense Disable Input
The headphone sensing function can be disabled by
the HPS_D bit (MAX9765/MAX9766). HPS_D bit deter-
mines whether the device is in automatic-detection
mode, or fixed-mode operation.
Headphone Sense Input (HPS)
When the MAX9765/MAX9766 are in automatic head-
phone-detection mode, the state of the headphone
sense input (HPS) determines the operating mode of
the device. A voltage on HPS less than 0.7 VDD sets
the device to speaker mode. A voltage greater than 0.9
VDD disables the inverting bridge amplifier (OUT_-),
which mutes the speaker amplifier and sets the device
into headphone mode.
Connect HPS to the control pin of a 3-wire headphone
jack as shown in Figure 2. With no headphone present,
the resistive voltage-divider created by R1 and R2 sets
the voltage on HPS to 44mV, setting the device to speak-
er mode. When a headphone plug is inserted into the
jack, the control pin is disconnected from the tip contact,
and HPS is pulled to VDD through R1, setting the device
into headphone mode. Place a resistor in series with the
control pin and HPS (R3) to prevent any audio signal
from coupling into HPS when the device is in speaker
mode.
Shutdown
The MAX9765/MAX9766/MAX9767 feature a 5A, low-
power shutdown mode that reduces quiescent current
consumption and extends battery life. The drive and
microphone amplifiers and the bias circuitry are dis-
abled, the amplifier outputs (OUT_/MIC_) go high
impedance, and BIAS and MICBIAS are driven to GND.
The digital section of the MAX9765/MAX9766 remains
active when the device is shut down through the inter-
face. A logic high on bit 0 of the SHDN register places
the MAX9765/MAX9766 in shutdown. A logic low
enables the device. A logic low on the
SHDN input
places the devices into shutdown mode, disables the
interface, and resets the I2C registers to a default state.
A logic high on
SHDN enables the device. A logic high
on
SHDN enables the devices.
MUTE
All devices feature a mute mode. When the device is
muted, the input is disconnected from the amplifiers.
MUTE only affects the power amplifiers, and does not
shut down the device. The MAX9765/MAX9766 MUTE
mode is selected by writing to the MUTE register (see
Command Byte Definitions). The left and right channels
can be independently muted. The MAX9767 features
an active-high MUTE input that mutes both channels.
INT/EXT
The MAX9767 microphone amplifier input configuration
is controlled by the
INT/EXT input. A logic low In
INT/EXT selects internal (differential) microphone
mode. A logic high selects external (single-ended)
mode.
Click-and-Pop Suppression
The MAX9765/MAX9766/MAX9767 feature Maxim’s
comprehensive click-and-pop suppression. During
startup and shutdown, the common-mode bias voltage
of the amplifiers is slowly ramped to and from the DC
bias point using an S-shaped waveform. In headphone
MAX9765
AUDIO
INPUT
15k
Ω
30k
Ω
IN_1
IN_2
Figure 1. Using the Input Multiplexer for Gain Setting
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX9765ETJ+ 功能描述:音頻放大器 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9765ETJ+T 功能描述:音頻放大器 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9765ETJ-T 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9765EVKIT 功能描述:放大器 IC 開(kāi)發(fā)工具 RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類(lèi)型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
MAX9766ETJ 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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