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參數(shù)資料
| 型號： | XE3006 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | Codec |
| 英文描述： | Low-Power Audio CODEC |
| 中文描述： | 低功耗音頻CODEC |
| 文件頁數(shù)： | 9/32頁 |
| 文件大?。?/td> | 465K |
| 代理商： | XE3006 |
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Data Sheet
XE3005/XE3006
9
D0212-116
2.1.9
Sandman DAC Function
The Sandman function monitors the signals, which are processed in the ADC signal, channel and the DAC
signal channel. The logic output signal SMDA indicates whether the DAC signal channel processes an audio
signal or only noise, and this for certain duration. The reference signal amplitude can be selected through register
P, the time window parameters are the off time and on time (registers L, M and N).
Serial Audio
Interface
BCLK
SDI
FSYNC
PWM
DAC
Power
amplifier
AOUTP
AOUTN
VSSPA
VDDPA
SMDA
Sandman
Interface
Reg I, bit 4
Figure 8: Implementation of the Sandman function for the DAC (SMDA)
The logic output SMDA can be employed to power-down other devices in the application, such as an external
audio power amplifier. By setting bit 4 in register I, the on-chip DAC signal channel can be powered-down through
SMDA too. The Sandman function is illustrated in Figure 9 and is valid for both SMAD (related to the ADC
signal) and SMDA (related to the DAC signal).
off-time
on-time
AIN/SDO
(AOUT/SDI)
SMAD
(SMDA)
On-time counter
Off-time counter
+ reference
- reference
Time step = 1/fs = 1/FSYNC
1 2
9
3
8
7
6
4
5
10
time
Figure 9: Illustration of the Sandman function.
The above illustration is valid for either the SMAD output as a result of AIN/SDO or for the SMDA output as a
function of AOUT/SDI.
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