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參數(shù)資料
| 型號： | WM8722 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | Stereo DAC with Integrated Tone Generator and Line/Variable Level Outputs |
| 中文描述： | 立體聲DAC，具有集成的音調(diào)發(fā)生器和線/變平輸出 |
| 文件頁數(shù)： | 13/23頁 |
| 文件大?。?/td> | 438K |
| 代理商： | WM8722 |
Advanced Information
WM8722
WOLFSON MICROELECTRONICS LTD
AI Rev 1.5 May 2000
13
LATCH STATE
1
0
Address
1000001
1000000
To control the WM8722 on the bus, the master must initiate a data transfer by establishing a start
condition, defined by a high-to-low transition on MD whilst MC remains high. This indicates that an
address and data transfer will follow. All peripherals respond to the start condition and shift the next
eight bits (7-bit address + R/W bit). The transfer is MSB first. The peripheral that recognises the
transmitted address responds by pulling the data line low during the ninth clock pulse (acknowledge
bit). All other devices withdraw from the bus and maintain an idle condition once the appropriate
peripheral has been recognised. The idle condition is where the device monitors the MD and MC
lines waiting for a start condition and the correct transmitted address. The R/W bit determines the
direction of data transfer. The WM8722 is a write only device and only responds to the R/W bit
indicating a write.
The WM8722 acts as a standard slave device on the bus. The data on the MD is clocked in by MC.
The first 6 bits (which must be 100000) are clocked into the WM8722 followed by a programmable
address bit to select one of the two available addresses. The eighth bit of the address byte is the
R/W bit. The WM8722 checks this bit and responds if it is a write. If the correct address is sent by
the master, the WM8722 acknowledges the bus master (ACK) and pulls the bus low. The next byte is
the register address. Each subsequent byte of data is separated by an acknowledge bit.
A stop condition is defined when there is a low-to-high transition on MD when MC is high.
If a stop or start condition is detected out of sequence at any point in the data transfer, the device
jumps to the idle condition.
SERIAL CONTROL OPERATION
Control of the various modes of operation is software control over the 2 or 3-wire serial interface. The
following functions may be controlled via the serial control interface:
FUNCTION
OPTIONS
SOFTWARE CONTROL
DEFAULT VALUE
Input audio data format
Normal format
I
2
S format
16
20
24
On
Off
Normal format (0)
Input Word Length
16 bit (0)
De-emphasis selection
Off (0)
Operation enable (OPE)
(power down)
Enable
disable
Enabled (0)
Analogue output mode
L, R, mono, Mute
Stereo (1001)
Mute
On (Muted)
Off (Un-muted)
Off (0)
Input LRCIN polarity
Lch/Rch = Hi/Lo
Lch/Rch = Lo/Hi
Lch/Rch = Hi/Lo (0)
Master Volume Control
Lch, Rch individually
Lch, Rch both
0dB (1111001)
Lch, Rch individually (0)
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相關(guān)代理商/技術(shù)參數(shù) |
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| WM8722_01 | 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 |
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| WM8725 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:99dB Stereo DAC |
| WM8725_04 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:99dB Stereo DAC |
| WM8725_12 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:99dB Stereo DAC |
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