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參數(shù)資料
| 型號： | XE3005I033TRLF |
| 廠商： | Semtech |
| 文件頁數(shù)： | 10/37頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CODEC LOW PWR 16BIT 20-TSSOP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 音頻編解碼器 |
| 數(shù)據(jù)接口： | 串行 |
| 分辨率（位）： | 16 b |
| ADC / DAC 數(shù)量： | 1 / 1 |
| 三角積分調(diào)變： | 是 |
| S/N 比，標(biāo)準(zhǔn) ADC / DAC (db)： | 78 / 78 |
| 動態(tài)范圍，標(biāo)準(zhǔn) ADC / DAC (db)： | 78 / 78 |
| 電壓 - 電源，模擬： | 1.8 V ~ 3.6 V |
| 電壓 - 電源，數(shù)字： | 1.8 V ~ 3.6 V |
| 工作溫度： | -20°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 585 (CN2011-ZH PDF) |
| 其它名稱： | XE3005I033DKR |
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Semtech 2005
www.semtech.com
18
XE3005/XE3006
On-time (7:0): Time until wakeup. The number of sequential samples that have to be higher than the Reference for
the power down signal to become inactive. The Sandman function is disabled (SMAD or SMDA at logic 1) if this
parameter is zero. The ADC and DAC have one common On-time value.
All these parameters are set in the registers L, M, N, O and P.
Reference(7:0)
On-time(7:0)
Off-time(15:0)
Sandman (SMAD or SMDA)
Comments
0
don’t care
logic 1 (disable function)
Sandman disable
don’t care
0
don’t care
logic 1 (disable function)
Sandman disable
don’t care
0
logic 1 (disable function)
Sandman disable
1.-.255
corresponds to
128.-.32640
1.-.255
corresponds to
50
s – 12 ms
1 - 65535
corresponds to
50
s - 3.2 sec
logic 1 (signal higher than ref)
logic 0 (signal lower than ref)
all registers
≠ zero
time for FSYNC =
20kHz
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) : 0111’1111’1111’1111 = 0x7FFF
max positive value
8 bit reference (unsigned)
: 0111’1111’1000’0000 = 0xFF00/2
reference max
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
AIN (mV) if gain = 20
0
0.00
1
128
1.10
0.27
2
256
2.20
0.55
M
255
× 128 = 32640
280
70
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 = 50s 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). fmin is the minimum audio
frequency = 100Hz if FSYNC = 20kHz. The value of fmin 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.
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