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參數(shù)資料
| 型號： | LM4921 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Low Voltage I2S 16-Bit Stereo DAC with Stereo Headphone Power Amplifiers and Volume Control |
| 中文描述： | 低電壓的I2S 16位立體聲DAC立體聲耳機功率放大器和音量控制 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 849K |
| 代理商： | LM4921 |
Application Information
SPI OPERATIONAL DESCRIPTION
The serial data bits are organized into a field which contains 16 bits of data defined by TABLE 1. Bits 1 & 2 determine the output
mode of the LM4921 as shown in TABLE 2. Bits 7 through 11 determine the volume level setting as illustrated by TABLE 3. Bit
12 sets the Bypass capacitor charging time.
Table 1. Bit Allocation
BIT #
0 (LSB)
Default Val
0
Function
RESET_B
Description
RESET_B = 0, Resets the DAC
Must be high for the part to run.
1
2
3
4
5
6
0
0
0
0
0
0
MODE CONTROL
See Table 2
MASTER/SLAVE
RESOLUTION
RESERVED
ZERO CROSSING SET
0 = SLAVE, 1 = MASTER
0 = 16 bit, 1 = 32 bit
Should always be set to ’1’
0 = ZXD ENABLE, 1 = ZXD
DISABLE
See Table 3 - Volume Control
Settings
7
8
9
10
11
12
13
14
15 (MSB)
0
0
0
0
0
0
0
0
0
VOLUME CONTROL
BYP CHARGE RATE
RESERVED
RESERVED
RESERVED
0 = 1X, 1 = 2X
Should always be set to ’0’
MODE CONTROL
Sets the modes as outlined in Table 2.
Table 2. Output Mode Selection (Bits 1 & 2 above)
Output Mode #
0
1
2
3
BIT 2
0
0
1
1
BIT 1
0
1
0
1
MODE
SD
STANDBY
MUTE
ACTIVE
Shutdown turns off the part completely for maximum power savings. The Standby mode turns off the clock but still consumes
more power than the shutdown mode. However, coming out of standby mode allows the part to turn back on faster than from
shutdown. In Mute mode the clocks remain on which uses more power but allows faster recovery and the ability to supply clock
signals to other devices which is important when the part is used in master mode. Active mode turns the part on for normal
operation.
MASTER/SLAVE SELECT
Allows the part to act as a master and supply the clock for
the rest of the system or be a slave to the system clock.
RESOLUTION SET
Sets the resolution to be either 16 or 32 bits of stereo audio
information. For most applications this will be set at 16 bits.
ZERO CROSSING DETECT SET
This pin turns on the zero crossing detection circuit. With this
circuit enabled the part will not allow a volume step change,
or shutdown mode, or standby mode to occur until the audio
input signal passes through zero. This pin should be set to
on for most applications.
L
www.national.com
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4921ITL | 制造商:Texas Instruments 功能描述:16BIT STEREO DAC + AMP SMD 4921 |
| LM4921ITL/NOPB | 功能描述:音頻放大器 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4921ITLEVAL | 功能描述:音頻 IC 開發(fā)工具 LM4921ITL EVAL BOARD 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 |
| LM4921ITLX | 制造商:Texas Instruments 功能描述:IC,Audio Amplifier,DUAL,BGA,20PIN,PLASTIC |
| LM4921ITLX/NOPB | 功能描述:音頻放大器 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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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