參數(shù)資料
型號(hào)： LM4931
廠商： National Semiconductor Corporation
英文描述： Audio Subsystem with Mono High Efficiency Loudspeaker and Stereo Headphone Amplifiers
中文描述： 與單聲道音頻子系統(tǒng)高效揚(yáng)聲器和立體聲耳機(jī)放大器
文件頁(yè)數(shù)： 24/47頁(yè)
文件大?。?/td> 1640K
代理商： LM4931
Power Management Configuration Registers
This register is used to control the power management settings.
DEFAULT CHART FOR PMC_CONFIG (0Ah)
DATA BIT
DEFAULT
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
0
PMC_CONFIG (0Ah) (SET = LOGIC 1, CLEAR = LOGIC 0)
Address
Register
Description
0
ZXD_DISABLE
If set then zero cross detection is ignored when changing modes or
gains. (Note 19)
Set to accommodate a selected bypass capacitor value to give correct
turn-on delay and click/pop performance. Value is set as follows: (Note
17)
2:1
Delay
00
short
01
medium
10
11
Set the GPIO port function: (Note 18)
5:3
000
001
010
011
100
101
110
111
RESERVED (Note 14)
When set enables dither in the class D amplifier
2:1
CAP_SIZE
Capacitor Size/Time
0.1μF/25ms
1μF/100ms
2.2μF/200ms
Test Mode/1ms
long
test
5:3
GPIO_SETUP
GPIO
HP_CONNECTED
VC_CLOCK
GPIO_DATA
EXT_LS_ENABLE
VOICE_ADC_SD
VOICE_DAC_SD
DAC_LEFT_SD
DAC_RIGHT_SD
6
7
RSVD
CLASS_D_DITHER
Note 17:
The effect of CAP_SIZE will vary with the audio clock frequency. The delays quoted are for a 12.288MHz MCLK. These will scale inversely to the MCLK
frequency. For example if used in a 44.1kHz application where the PLL output is 11.2896MHz, “01” or 100ms will be 100ms*11.2896/12.288 = 108.8ms. It is
suggested that to save power earlier during the shutdown cycle, the PLL can be disabled and the MCLK or MCLK/2 can be used to bypass the PLL and also provide
longer shutdown times for further reduced click and pop.
Note 18:
VC_CLOCK is only supplied over the GPIO port if the voice codec is enabled.
Note 19:
To ensure a successful transition into Powerdown Mode, ZXD_DISABLE must be set whenever there is no audio input signal present.
L
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4931_06 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Audio Subsystem with Mono High Efficiency Loudsperker and Stereo Headphone Amplifiers
LM4931ITL/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
LM4931ITLBD 功能描述:BOARD EVALUATION LM4931ITL RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:-
LM49321 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Audio Sub-System with Stereo DAC, Mono Class AB Loudspeaker Amplifier, OCL/SE Stereo Headphone Output and RF Suppression
LM49321RL 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Audio Sub-System with Stereo DAC, Mono Class AB Loudspeaker Amplifier, OCL/SE Stereo Headphone Output and RF Suppression
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