- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384715 > MAX9850 (Maxim Integrated Products, Inc.) Stereo Audio DAC with DirectDrive Headphone Amplifier PDF資料下載
參數(shù)資料
| 型號： | MAX9850 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Stereo Audio DAC with DirectDrive Headphone Amplifier |
| 中文描述： | 立體聲音頻DAC，帶有DirectDrive®耳機放大器 |
| 文件頁數(shù)： | 32/36頁 |
| 文件大小： | 956K |
| 代理商： | MAX9850 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁當前第32頁第33頁第34頁第35頁第36頁
M
The address pointer can be preset to a specific register
before a read command is issued. The master presets
the address pointer by first sending the MAX9850’s
slave address with the R/
W
bit set to 0 followed by the
register address. A REPEATED START condition is then
sent followed by the slave address with the R/
W
bit set
to 1. The MAX9850 transmits the contents of the speci-
fied register. The address pointer autoincrements after
transmitting the first byte. Attempting to read from reg-
ister addresses higher than 0xB results in repeated
reads of 0xB. Note that 0xB is a reserved register.
The master acknowledges receipt of each read byte
during the acknowledge clock pulse. The master must
acknowledge all correctly received bytes except the
last byte. The final byte must be followed by a not-
acknowledge from the master and then a STOP condi-
tion. Figure 10 illustrates the frame format for reading
one byte from the MAX9850. Figure 11 illustrates the
frame format for reading multiple bytes from the
MAX9850.
Applications Information
Powering On/Off the MAX9850
The MAX9850 powers on in low-power shutdown mode
with the DAC, headphones, line inputs, and outputs all
disabled. For useful circuit operation to be available,
the charge pump needs to be activated using
CPEN(1:0) in the enable register (register 0x5, bits B5
and B4). Setting the appropriate bits in the enable reg-
ister will enable the desired circuit functions on the
MAX9850. Finally, the global shutdown bit,
SHDN
needs to be set to 1 (register 0x5, bit B7). The enable
bits can all be set with a single I
2
C write operation.
It is good practice for an application to configure the
I
2
C registers before taking the MAX9850 out of shut-
down. This may include setting initial volume levels,
DAC mode of operation, stereo or mono operation, and
audio interface settings. Powering on the MAX9850 with
all the registers set ensures that the audio output will
not be interrupted.
The charge pump starts and establishes the internal
supply voltages once the appropriate byte is written to
the enable register. The MAX9850 is ready for opera-
tion approximately 10ms after the charge pump is
enabled. If selected, the headphone outputs will also
complete a clickless/popless power-up sequence dur-
ing this time. The headphone amplifier status bit (SHP)
(register 0x1, bit B3) sets to 1 once the headphones
are ready to operate. The line inputs and outputs will
also turn on during this 10ms startup period if enabled.
Let AC-coupling capacitors settle before enabling the line
input amplifiers. The input-coupling capacitor charges to
the output bias voltage of the driving device even while
the MAX9850 is in shutdown. The input AC coupling
capacitors are charged and ready for use immediately
after power is applied to the system in most applications.
Stereo Audio DAC with DirectDrive
Headphone Amplifier
32
______________________________________________________________________________________
ACKNOWLEDGE FROM MAX9850
1 BYTE
AUTOINCREMENT INTERNAL
REGISTER ADDRESS POINTER
ACKNOWLEDGE FROM MAX9850
NOT ACKNOWLEDGE FROM MASTER
B1 B0
B3 B2
B5 B4
B7 B6
A
A
P
A
0
ACKNOWLEDGE FROM MAX9850
R/W
S
A
R/W
REPEATED START
Sr
1
SLAVE ADDRESS
REGISTER ADDRESS
SLAVE ADDRESS
DATA BYTE
Figure 10. Reading One Byte of Data from MAX9850
ACKNOWLEDGE FROM MAX9850
1 BYTE
AUTOINCREMENT INTERNAL
REGISTER ADDRESS POINTER
ACKNOWLEDGE FROM MAX9850
ACKNOWLEDGE FROM MASTER
B1 B0
B3 B2
B5 B4
B7 B6
A
A
A
0
ACKNOWLEDGE FROM MAX9850
R/W
S
A
R/W
REPEATED START
Sr
1
1 BYTE
AUTOINCREMENT INTERNAL
REGISTER ADDRESS POINTER
NOT ACKNOWLEDGE
FROM MASTER
B3 B2
B5 B4
B1 B0
B7 B6
P
A
SLAVE ADDRESS
REGISTER ADDRESS
SLAVE ADDRESS
FIRST DATA BYTE
Nth DATA WORD
Figure 11. Reading n-Bytes from MAX9850
相關PDF資料 |
PDF描述 |
|---|---|
| MAX9850ETI | Stereo Audio DAC with DirectDrive Headphone Amplifier |
| MAX9995ETX-D | Dual, SiGe, High-Linearity, 1700MHz to 2200MHz Downconversion Mixer with LO Buffer/Switch |
| MAX9995ETX-T | Dual, SiGe, High-Linearity, 1700MHz to 2200MHz Downconversion Mixer with LO Buffer/Switch |
| MAX9995ETX-TD | Dual, SiGe, High-Linearity, 1700MHz to 2200MHz Downconversion Mixer with LO Buffer/Switch |
| MAX9995ETX | Dual, SiGe, High-Linearity, 1700MHz to 2200MHz Downconversion Mixer with LO Buffer/Switch |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX98500EVKIT+ | 功能描述:音頻 IC 開發(fā)工具 MAX98500 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| MAX98500EWE+ | 制造商:Maxim Integrated Products 功能描述:BOOSTED CLASS D AMPLIFIER WITH ALC - Rail/Tube |
| MAX98500EWE+T | 功能描述:音頻放大器 2.2W Mono Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)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 |
| MAX98502EVKIT# | 功能描述:放大器 IC 開發(fā)工具 MAX98502 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| MAX98502EWE+ | 功能描述:音頻放大器 Boosted Class D Amplifier RoHS:否 制造商:STMicroelectronics 產(chǎn)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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。