参数资料
型号: MAX9744ETH+T
厂商: Maxim Integrated Products
文件页数: 10/28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
MAX9744
Write Byte
A write to the MAX9744 includes transmission of a
START condition, the slave address with the R/W bit set
to 0 (see Table 3), one byte of data to the command
register, and a STOP condition. Figure 6 illustrates the
proper format for one frame.
A write to the MAX9744 consists of a 6-step sequence
as seen below:
1) The master sends a START condition.
2) The master sends the 7 bits slave ID plus a write
bit (low).
3) The addressed slave asserts an ACK on the data
line.
4) The master sends 8 data bits.
5) The active slave asserts an ACK (or NACK) on the
data line.
6) The master generates a stop condition.
Speaker Volume Control
The command register is used to control the volume
level of the speaker amplifier. The two MSBs (A1 and
A0) are set to 00, while V5–V0 is the data that is written
into the addresses register to set the volume level
(Tables 5 and 6).
Filterless Modulation/PWM
The MAX9744 features two output modulation schemes:
filterless modulation or classic PWM, selectable through
the I2C interface. Table 6 shows the register command
to set the output scheme.
When switching between schemes, the output is not
click-and-pop protected. To have click-and-pop protec-
tion when switching between output schemes, the
device must enter shutdown mode and be configured
to the new output scheme before the 220ms startup
sequence is terminated.
20W Stereo Class D Speaker Amplifier
with Volume Control
18
______________________________________________________________________________________
S
SLAVE
ADDRESS
7 BITS
WRITE BYTE FORMAT
WR
ACK
DATA
8 BITS
ACK
P
DATA BYTE: GIVES A COMMAND.
SLAVE ADDRESS:
EQUIVALENT TO CHIP-
SELECT LINE OF A
3-WIRE INTERFACE.
0
Figure 6. Write Byte Format Example
D7 (MSB)
D6
D5
D4
D3
D2
D1
D0 (LSB)
A1
A0
V5
V4
V3
V2
V1
V0
Table 5. Data Byte Format
A0A1
V5–V0
SETTING
00
XXXXXX
Volume level (Table 7)
01
000000
Filterless modulation
01
000001
Classic PWM
A0A1
V5–V0
SETTING
10
XXXXXX
Reserved
11
000100
Increased volume
11
000101
Decreased volume
Table 6. Command Register Programming
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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