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參數(shù)資料
| 型號： | XWM8722EDS |
| 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)： | 20/23頁 |
| 文件大?。?/td> | 438K |
| 代理商： | XWM8722EDS |
WM8722
Advanced Information
WOLFSON MICROELECTRONICS LTD
AI Rev 1.5 May 2000
20
MXINR
MXINL
LINEOUTL
VAROUTL
VAROUTR
LINEOUTR
+
+
+
+
0/-6dB
0/-6dB
0/-6dB
L Mix Switches (0-9)
0/-6dB
R Mix Switches (0-9)
TONE
DAC
LEFT
DAC
RIGHT
DAC
Figure 9. Output Mixer Configuration
M6DB
In each of the 4 MUX control registers there is an M6DB bit relevant to that channel. Setting M6DB
high reduces the relevant output signal by 6dB.
BOTH
When a write to any MXSEL register is made with the BOTH bit set high, then the complementary
channel MXSEL register for the other channel is updated with the same value. For example, if
RVMXSEL is updated and BOTH is set, then LVMXSEL is updated with the same value, but the
RMXSEL and LMXSEL registers (the non variable output path muxes) are NOT updated.
REGISTER 12
TONE DURATION
Bits 0-7 of register 12 sets the duration of the tone burst. Writing to the register with a non-zero value
starts the tone burst. Wring zero to this register stops the tone.
T = (2.7x10
6
x TTIM[7:0])/ F
TCLK
REGISTER 13
TONE GENERATOR GAIN CONTROL
Bits 0-4 of register 13 TVOL[0:4] set the gain level of the tones summed into the analogue outputs.
Bit 5 of this word controls muting of the tones. Note both mute must be off (0) and the tone input to
the relevant mixer summing path must be selected (1). The gain defaults to 0dB (11111) but may be
attenuated n 1.5dB steps down to
–
46.5dB.
TONE GENERATOR WAVEFORM CONTROL
TFIN
A control bit (TFIN) is provided which allows selection of the method of completion of the burst. If set
to 1, the burst completes at the next zero crossing. If left at 0, the burst completes a whole number
of sinusoids, avoiding potential problems with DC levels changing across AC coupling capacitors. At
the conclusion of a tone burst, the circuit ensures that at the end of the duration time of the last tone,
the tone continues to the next zero crossing point to ensure DC offsets are not created.
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