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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)： | 17/32頁 |
| 文件大?。?/td> | 465K |
| 代理商： | XE3006 |
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Data Sheet
XE3005/XE3006
The reference (7:0) value is related to the absolute value of the 16 bits input signal. The following format is used
for the comparison:
16 bit inputs data (2’s-complement) : 0
111’1111’1
111’1111 = 0x7FFF
8 bit reference (unsigned)
: 0
111’1111’1
000’0000 = 0xFF00/2
So the reference is compared to the 8 most significant bits of the absolute value of the input signal:
reference(7:0)
Absolute reference
AIN (mV) if gain = 4
0
0
1
128
2
256
M
M
255
255
×
128 = 32640
The values in this table are amplitude values, RMS values can be derived by dividing the numbers by
√
2.
The working mechanism of the Sandman function is the following:
The incoming data is compared to the reference after each time step (1/FSYNC = 50μs if FSYNC = 20kHz).
During the On-time phase
If the input data is higher than the reference, a counter will be incremented otherwise the counter is reset.
When the counter reaches the On-time value, then the SMAD or SMDA signal is activated (high level).
During the Off-time phase
If the input data is lower than the reference, a counter will be incremented otherwise the counter is reset.
When the counter reaches the Off-time value, then the SMAD or SMDA signal is deactivated (low level).
In a first approximation, the following points are recommended:
On-time at least 1ms
. If the On-time is shorter than 1 ms, the Sandman function becomes sensitive to
spikes in the audio input signal AIN.
Off-time at least 10ms,
the Off-time should be longer than 1/f
min
= 10ms, (code = 200). f
min
is the minimum
audio frequency = 100Hz if FSYNC = 20kHz. The value of f
min
scales proportionally with the sampling
frequency FSYNC. A high-pass filter in the ADC filters out signals below 100Hz.
Reference should be adjusted just above the noise level.
The CODEC bandwidth is around 100 Hz to 10 kHz at the nominal system frequency settings (MCLK = 5 MHz,
CKDIV = 1, FSYNC = 20 kHz).
In digital loop back mode, the data entering into the Audio Interface is not transferred to the DAC. However, the
Sandman function (if activated) continues to output the SMDA signal based on the data entered into the Audio
Interface (input terminal SDI).
17
D0212-116
max positive value
reference max
AIN (mV) if gain = 20
0.00
0.27
0.55
M
70
0.00
1.10
2.20
M
280
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