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| 型号： | MAX9768ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/26页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO 10W MONO D 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | D 类 |
| 输出类型： | 1-通道（单声道） |
| 在某负载时最大输出功率 x 通道数量： | 10W x 1 @ 8 欧姆 |
| 电源电压： | 4.5 V ~ 14 V |
| 特点： | 消除爆音，I²C，静音，短路和热保护，关机，音量控制 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
MAX9768
10W Mono Class D Speaker
Amplifier with Volume Control
______________________________________________________________________________________
15
Hard Current Limit
When the output current exceeds the hard current limit,
2.5A (typ), the MAX9768 disables the outputs and initi-
ates a startup sequence. This startup sequence takes
220ms for the MAX9768 and 15ms for the MAX9768B.
The shutdown and startup sequence is repeated until
the output fault is removed. When in hard current limit,
the output may make a soft clicking sound. The aver-
age supply current is relatively low, as the duty cycle of
the output short is brief. Most applications will not enter
hard current-limit mode unless the output is short cir-
cuited or incorrectly connected.
Thermal Shutdown
When the die temperature exceeds the thermal shut-
down threshold, +150°C (typ), the MAX9768 outputs
are disabled. When the die temperature decreases
below +135°C (typ), normal operation resumes. The
effect of thermal shutdown is an output signal turning
off for approximately 3s in most applications, depend-
ing on the thermal time constant of the audio system.
Most applications should never enter thermal shut-
down. Some of the possible causes of thermal shut-
down are too low of a load impedance, high ambient
temperature, poor PCB layout and assembly, or exces-
sive output overdrive.
Shutdown
The MAX9768 features a shutdown mode that reduces
power consumption and extends battery life. Driving
SHDN low places the device in low-power (0.5A) shut-
down mode. Connect SHDN to digital high for normal
operation. In shutdown mode, the outputs are high
impedance, SYNCOUT is pulled high, the BIAS voltage
decays to zero, and the common-mode input voltage
decays to zero. The I2C register retains its contents
during shutdown.
Undervoltage Lockout (UVLO)
The MAX9768 features an undervoltage lockout protec-
tion that shuts down the device if either of the supplies
are too low. The device will go into shutdown if VDD is
less than 2.5V (VDD UVLO = 2.5V) or if PVDD is less
than 4V (PVDD UVLO = 4V).
Mute Function
The MAX9768 features a clickless/popless mute mode.
When the device is muted, the outputs do not stop
switching, only the volume level is muted to the speak-
er. To mute the MAX9768, drive MUTE to logic-high.
MUTE should be held high during system power-up
and power-down to ensure optimum click-and-pop
performance.
Volume Control
The volume control operates from either an analog volt-
age input or through the I2C interface. The volume con-
trol has 64 levels, with the lowest setting equal to mute.
To set the device to analog mode, connect ADDR1 and
ADDR2 to GND. In analog mode, SDA/VOL is an ana-
log input for volume control, see the
Functional
Diagram/Typical Application Circuit. The analog input
range is ratiometric between 0.9 x VDD and 0.1 x VDD,
where 0.9 x VDD = full mute and 0.1 x VDD = full volume
(Table 6).
In I2C mode, volume control for the speaker is controlled
separately by the command register (Tables 4, 5, 6). See
the
Write Data Format section for more information
regarding formatting data and tables to set volume levels.
I2C Interface
The MAX9768 features an I2C 2-wire serial interface
consisting of a serial data line (SDA) and a serial clock
line (SCL). SDA and SCL facilitate communication
between the MAX9768 and the master at clock rates up
to 400kHz. When the MAX9768 is used on an I2C bus
with multiple devices, the VDD supply must stay pow-
ered on to ensure proper I2C bus operation. The mas-
ter, typically a microcontroller, generates SCL and
initiates data transfer on the bus. Figure 3 shows the 2-
wire interface timing diagram.
A master device communicates to the MAX9768 by trans-
mitting the proper address followed by the data word.
Each transmit sequence is framed by a START (S) or
REPEATED START (Sr) condition and a STOP (P) condi-
tion. Each word transmitted over the bus is 8 bits long
and is always followed by an acknowledge clock pulse.
The MAX9768 SDA line operates as both an input and
an open-drain output. A pullup resistor, greater than
500
Ω, is required on the SDA bus. The MAX9768 SCL
line operates as an input only. A pullup resistor, greater
than 500
Ω, is required on SCL if there are multiple mas-
ters on the bus, or if the master in a single-master sys-
tem has an open-drain SCL output. Series resistors in
line with SDA and SCL are optional. The SCL and SDA
inputs suppress noise spikes to assure proper device
operation even on a noisy bus.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| MAX9768EVKIT+ | 功能描述:音频 IC 开发工具 MAX9768 Eval Kit RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| MAX976ESA | 功能描述:校验器 IC Dual High Speed Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX976ESA+ | 功能描述:校验器 IC Dual High Speed Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX976ESA+T | 功能描述:校验器 IC Dual High Speed Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
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