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参数资料
| 型号： | MAX9744ETH+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/28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
______________________________________________________________________________________
13
Pin Description (continued)
PIN
NAME
FUNCTION
26
SYNCOUT
SYNC Signal Output
31, 32
OUTR+
Right-Channel Positive Speaker Output
33
BOOTR+
Right-Channel Positive Speaker Output Boost Flying-Capacitor Connection. Connect a 0.1F
ceramic capacitor between BOOTR+ and OUTR+.
34, 35, 39,
43, 44
PGND
Power Ground
36, 37
OUTR-
Right-Channel Negative Speaker Output
38
BOOTR-
Right-Channel Negative Speaker Output Boost Flying-Capacitor Connection. Connect a 0.1F
ceramic capacitor between BOOTR- and OUTR-.
40
BOOTL-
Left-Channel Negative Speaker Output Boost Flying-Capacitor Connection. Connect a 0.1F
ceramic capacitor between BOOTL- and OUTL-.
41, 42
OUTL-
Left-Channel Negative Speaker Output
—EP
Exposed Pad. The external pad lowers the package’s thermal impedance by providing a direct
heat conduction path from the die to the PCB. Connect the exposed thermal pad to PGND.
Detailed Description
The MAX9744 20W filterless, stereo Class D audio
power amplifier offers Class AB performance with Class
D efficiency with a minimal board space solution. The
MAX9744 features a spread-spectrum modulation
scheme offering significant improvements to switch-
mode amplifier technology. This device features analog
or digitally adjustable volume control, externally set
input gain, shutdown mode, SYNC input and output,
mute, and industry-leading click-and-pop suppression.
The MAX9744 features extensive click-and-pop sup-
pression circuitry that eliminates audible clicks-and-
pops at startup and shutdown.
The MAX9744 features a 64-step, dual-mode (analog
or I2C) volume control and mute function. In analog vol-
ume control mode, the voltage applied to SDA/VOL
sets the volume level. Two address inputs (ADDR1,
ADDR2) set the volume control function between ana-
log and I2C mode and set the slave address. In I2C
mode, there are three selectable slave addresses
allowing for multiple devices on a single bus.
The MAX9744 offers spread-spectrum and fixed-fre-
quency modes of operation with classic PWM or filter-
less modulation output schemes. The filterless
modulation scheme uses minimum pulse outputs when
the audio inputs are at the zero crossing. As the input
voltage increases or decreases, the duration of the
pulse at one output increases while the other output
pulse duration remains the same. This causes the net
voltage across the speaker (VOUT+ - VOUT-) to change.
The minimum-width pulse topology reduces EMI and
increases efficiency.
Operating Modes
Fixed-Frequency Modulation Mode
The MAX9744 features two fixed-frequency modes:
300kHz and 360kHz. Connect SYNC to GND to select
300kHz switching frequency; leave SYNC unconnected
to select the 360kHz switching frequency. The
MAX9744 frequency spectrum consists of the fundamen-
tal switching frequency and its associated harmonics
(see the Wideband Output Spectrum graphs in the
Typical
Operating Characteristics). For applications where exact
spectrum placement of the switching fundamental is
important, program the switching frequency so that the
harmonics do not fall within a sensitive frequency band
(Table 1). Audio reproduction is not affected by chang-
ing the switching frequency.
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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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