- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄372956 > XWM8721EDS (Wolfson Microelectronics) Internet Audio DAC with Integrated Headphone Driver PDF資料下載
參數(shù)資料
| 型號： | XWM8721EDS |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | Internet Audio DAC with Integrated Headphone Driver |
| 中文描述： | 互聯(lián)網(wǎng)音頻DAC集成耳機(jī)驅(qū)動器 |
| 文件頁數(shù)： | 26/34頁 |
| 文件大小： | 347K |
| 代理商： | XWM8721EDS |
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頁當(dāng)前第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁
WM8721
Product Preview
WOLFSON MICROELECTRONICS LTD
PP Rev 1.3 November 2000
26
POWER DOWN MODES
The WM8721 contains power conservation modes in which various circuit blocks may be safely
powered down in order to conserve power. This is software programmable as shown in Table 18.
REGISTER
ADDRESS
0000110
Power Down
Control
BIT
LABEL
DEFAULT
DESCRIPTION
3
DACPD
0
DAC Power Down
1 = Enable Power Down
0 = Disable Power Down
Line Output Power Down
1 = Enable Power Down
0 = Disable Power Down
Power Off Device
1 = Device Power Off
0 = Device Power On
4
OUTPD
0
7
POWEROFF
0
Table 18 Power Conservation Modes Software Control
Note:
When writing to register 0000110 bits 0, 1, 2, 5 and 6 should be set to 1.
The power down control can be used to either a) permanently disable functions when not required in
certain applications or b) to dynamically power up and down functions depending on the operating
mode, e.g.: during playback or record. Please follow the special instructions below if dynamic
implementations are being used.
DACPD:
Powers down the DAC and DAC Digital Filters. If this is done dynamically then audible pops
will result unless the following guidelines are followed. In order to prevent pops, the DAC should first
be soft-muted (DACMU), the output should then be de-selected from the line and headphone output
(DACSEL), then the DAC powered down (DACPD). This is of use when the device enters Pause or
Stop modes.
OUTPD:
Powers down the Line Headphone Output. If this is done dynamically then audible pops
may result unless the DAC is first soft-muted (DACMU). This is of use when the device enters
Record, Pause or Stop modes.
The device can be put into a standby mode (STANDBY) by powering down all the audio circuitry
under software control by setting DACPD and OUTPD, but not setting POWEROFF.
In STANDBY mode the Control Interface, a small portion of the digital and areas of the analogue
circuitry remain active. The active analogue includes the analogue VMID reference so that the
analogue line outputs and headphone outputs remain biased to VMID. This reduces any audible
effects caused by DC glitches when entering or leaving STANDBY mode.
The device can be powered off by writing to the POWEROFF bit of the Power Down register. In
POWEROFF mode the Control Interface and a small portion of the digital remain active. The
analogue VMID reference is disabled.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XWM8722EDS | Stereo DAC with Integrated Tone Generator and Line/Variable Level Outputs |
| XWM8728EDS | 24-bit, 192kHz Stereo DAC with Volume Control and DSD Support |
| XWM8729ED | 24-bit, 192kHz Stereo DAC |
| XWM8731EDS | Portable Internet Audion CODEC with Headphone Driver and Programmable Sample Rates |
| XWM8733ED | Filament Replacement LED Lamp; Color:Warm White; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No; Voltage Rating:24V; Bulb Size:T-3 1/4; Forward Current:30mA; Forward Voltage:24V; LED Color:Warm White RoHS Compliant: No |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XWM8721EDS/R | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Internet Audio DAC with Integrated Headphone Driver |
| XWM8722EDS | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Stereo DAC with Integrated Tone Generator and Line/Variable Level Outputs |
| XWM8728EDS | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:24-bit, 192kHz Stereo DAC with Volume Control |
| XWM8728EDS/R | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:24-bit, 192kHz Stereo DAC with Volume Control |
| XWM8729ED | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:24-bit, 192kHz Stereo DAC |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。