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參數(shù)資料
| 型號： | LM4935WL |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | ADC |
| 英文描述： | Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC |
| 中文描述： | 音頻子系統(tǒng)的雙模單聲道立體聲耳機和揚聲器放大器的高效率和多功能模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 21/112頁 |
| 文件大?。?/td> | 5017K |
| 代理商： | LM4935WL |
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12.0 Status & Control Registers
(Continued)
12.1 BASIC CONFIGURATION REGISTER
This register is used to control the basic function of the chip.
TABLE 2. BASIC (0x00h)
Bits
1:0
Field
Description
CHIP_MODE
The LM4935 can be placed in one of four modes which dictate its basic operation. When a new
mode is selected the LM4935 will change operation silently and will re-configure the power
management profile automatically. The modes are described as follows:
CHIP MODE
Audio System
Detection System
00
2
Off
Off
01
2
Off
On
Typical Application
Power-down Mode
Stand-by mode with headset event
detection
Active without headset event detection
Active with headset event detection
10
2
11
2
On
On
Off
On
2
3
PLL_ENABLE
USE_OSC
If set the PLL can be used.
If set the power management and control circuits will assume that no external clock is available and
will resort to using an on-chip oscillator for SAR, headset detection and analog power management
functions such as click and pop.
Programs the extra delays required to stabilize once charge/discharge is complete, based on the size
of the bypass capacitor.
CAP_SIZE
Bypass Capacitor Size
00
2
0.1 μF
01
2
1 μF
10
2
2.2 μF
11
2
4.7 μF
If set, the mixers assume that the signals on the left and right internal busses are highly correlated
and when these signals are combined their levels are reduced by 6 dB to allow enough headroom for
them to be summed at the Loudspeaker, Earpiece, CPOUT, and AUXOUT amplifiers. For the
Headphone amplifier, if this bit is set, the left and right signal levels are routed to the corresponding
left or right headphone output; if this bit is cleared, the left and the right signals are added and routed
to both headphone outputs and their levels are reduced by 6dB to allow enough headroom.
If set the part is placed in OCL (Output Capacitor Less) mode.
5:4
CAP_SIZE
Turn-off/on time
45 ms/75 ms
45 ms/140 ms
45 ms/260 ms
45 ms/500 ms
6
STEREO
7
OCL
For reliable headset / push button detection the following bits should be defined before enabling the headset detection system by
setting bit 0 of CHIP_MODE:
The OCL-bit (Cap / Capless headphone interface; bit 7 of this register)
The headset insert/removal debounce settings (bits 6:3 of DETECT (0x17h))
The BTN_TYPE-bit (Parallel / Series push button type; bit 3 MIC_2 register (0x0Ch))
The parallel push button debounce settings (bits 5:4 of MIC_2 register (0x0Ch))
All register fields controlling the audio system should be defined before setting bit 1 of CHIP_MODE and should not be altered
while the audio sub-system is active.
If the analog or digital levels are below 12 dB then it is not necessary to set the stereo bit allowing greater output levels to be
obtained for such signals.
L
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM4935WLX | Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC |
| LM4936 | Stereo 2W Audio Power Amplifiers with Volume Control and Selectable Control Interface (SPI or I2C) |
| LM4951 | Wide Voltage Range 1.8 Watt Audio Amplifier |
| LM4953 | Ground-Referenced, Ultra Low Noise, Ceramic Speaker Driver |
| LM4953SD | Ground-Referenced, Ultra Low Noise, Ceramic Speaker Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4935WLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC |
| LM4936 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Stereo 2W Audio Power Amplifiers with Volume Control and Selectable Control Interface (SPI or I2C) |
| LM49360 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Mono Class D Audio Codec PMU with Ground Referenced Headphone Amplifiers, Earpiece Driver, Audio DSP, 2 Step-Down DC-DC Converters, and 7 LDO Regulators |
| LM49360RL | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Mono Class D Audio Codec PMU with Ground Referenced Headphone Amplifiers, Earpiece Driver, Audio DSP, 2 Step-Down DC-DC Converters, and 7 LDO Regulators |
| LM49360RLX | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Mono Class D Audio Codec PMU with Ground Referenced Headphone Amplifiers, Earpiece Driver, Audio DSP, 2 Step-Down DC-DC Converters, and 7 LDO Regulators |
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