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参数资料
| 型号： | MAX9744ETH+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/28页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 22.5W D 44TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | D 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： | 22.5W x 2 @ 4 欧姆 |
| 电源电压： | 4.5 V ~ 14 V |
| 特点： | 消除爆音，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： | 44-TQFN-EP（7x7） |
| 封装/外壳： | 44-WFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | MAX9744ETH+TDKR |
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MAX9744
20W Stereo Class D Speaker Amplifier
with Volume Control
16
______________________________________________________________________________________
Volume Control
For maximum flexibility, the MAX9744 features volume
control operation using an analog voltage input or
through the I2C interface. To set the device to analog
mode, connect ADDR1 and ADDR2 to GND. In analog
mode, SDA/VOL is an analog input for volume control.
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 7).
Use ADDR1 and ADDR2 to select I2C mode. There are
three addresses that can be chosen, allowing for multi-
ple devices on a single bus (Table 4). In I2C mode, vol-
ume is controlled by choosing the speaker volume
control register in the command byte (Table 5). There
are 64 volume settings, where the lowest setting is full
mute (Table 6). See the
Write Byte section for more
information on formatting data and tables to set volume
levels. The default volume after power-up is position 40
(-7.1dB) (see Table 7).
I2C Interface
The MAX9744 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 MAX9744 and the master at clock rates up
to 400kHz. Figure 3 shows the 2-wire interface timing
diagram. The MAX9744 is a receive-only slave device,
relying on the master to generate the SCL signal. The
MAX9744 cannot write to the SDA bus except to
acknowledge the receipt of data from the master. The
master, typically a microcontroller, generates SCL and
initiates data transfer on the bus.
A master device communicates to the MAX9744 by
transmitting 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 MAX9744 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 MAX9744 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 have Schmitt trigger and filter circuits that sup-
press noise spikes to assure proper device operation
even on a noisy bus.
SCL
SDA
START
CONDITION
STOP
CONDITION
REPEATED
START
CONDITION
START
CONDITION
tHD, STA
tSU, STA
tHD, STA
tSP
tBUF
tSU, STO
tLOW
tSU, DAT
tHD, DAT
tHIGH
tR
tF
Figure 3. 2-Wire Serial-Interface Timing Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9744EVCMAXQU+ | 功能描述:音频放大器 Evaluation Kit/Evaluation System for the MAX9744 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 |
| MAX9744EVKIT+ | 功能描述:音频放大器 Evaluation Kit/Evaluation System for the MAX9744 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 |
| MAX974CPE | 功能描述:校验器 IC 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 |
| MAX974CPE+ | 功能描述:校验器 IC Dual Comparator / Reference 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 |
| MAX974CSE | 功能描述:校验器 IC 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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