參數(shù)資料
型號: MAX9744ETH+
廠商: Maxim Integrated Products
文件頁數(shù): 10/28頁
文件大小: 0K
描述: IC AMP AUDIO PWR 22.5W D 44TQFN
產品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 43
類型: D 類
輸出類型: 2 通道(立體聲)
在某負載時最大輸出功率 x 通道數(shù)量: 22.5W x 2 @ 4 歐姆
電源電壓: 4.5 V ~ 14 V
特點: 消除爆音,靜音,短路和熱保護,關機,音量控制
安裝類型: 表面貼裝
供應商設備封裝: 44-TQFN-EP(7x7)
封裝/外殼: 44-WFQFN 裸露焊盤
包裝: 管件
產品目錄頁面: 1392 (CN2011-ZH PDF)
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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MAX9744ETH+ 功能描述:音頻放大器 Stereo 20W Class D Amplifier RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9744ETH+T 功能描述:音頻放大器 Stereo 20W Class D Amplifier RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9744EVCMAXQU+ 功能描述:音頻放大器 Evaluation Kit/Evaluation System for the MAX9744 RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX9744EVKIT+ 功能描述:音頻放大器 Evaluation Kit/Evaluation System for the MAX9744 RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
MAX974CPE 功能描述:校驗器 IC RoHS:否 制造商:STMicroelectronics 產品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓(最大值):6 mV 電源電流(最大值):1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel