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參數(shù)資料
| 型號： | LM4921ITLX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA20 |
| 封裝： | MICRO, SMD-20 |
| 文件頁數(shù)： | 3/20頁 |
| 文件大小： | 457K |
| 代理商： | LM4921ITLX/NOPB |
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 #
Default Val
Function
Description
0 (LSB)
0
RESET_B
RESET_B = 0, Resets the DAC
Must be high for the part to run.
1
0
MODE CONTROL
See Table 2
2
0
3
0
MASTER/SLAVE
0 = SLAVE, 1 = MASTER
4
0
RESOLUTION
0 = 16 bit, 1 = 32 bit
5
0
RESERVED
Should always be set to '1'
6
0
ZERO CROSSING SET
0 = ZXD ENABLE, 1 = ZXD DISABLE
7
0
VOLUME CONTROL
See Table 3 - Volume Control Settings
8
0
9
0
10
0
11
0
12
0
BYP CHARGE RATE
0 = 1X, 1 = 2X
13
0
RESERVED
14
0
RESERVED
15 (MSB)
0
RESERVED
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 #
BIT 2
BIT 1
MODE
0
SD
1
0
1
STANDBY
2
1
0
MUTE
3
1
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.
11
www.national.com
LM4921
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM4922 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier |
| LM4922TL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LM4922TL/NOPB | 功能描述:音頻放大器 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 |
| LM4922TLX/NOPB | 功能描述:音頻放大器 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 |
| LM4923 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1.1 Watt Fully Differential Audio Power Amplifier With Shutdown Select |
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