参数资料
型号: MAX195BEWE+T
厂商: Maxim Integrated Products
文件页数: 16/28页
文件大小: 0K
描述: IC ADC 16BIT 85KSPS 16-SOIC
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 1,000
位数: 16
采样率(每秒): 85k
数据接口: QSPI?,串行,SPI?
转换器数目: 2
功率耗散(最大): 80mW
电压电源: 模拟和数字,双 ±
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.295",7.50mm 宽)
供应商设备封装: 16-SOIC W
包装: 带卷 (TR)
输入数目和类型: 1 个单端,单极;1 个单端,双极
MAX195
16-Bit, 85ksps ADC with 10A Shutdown
______________________________________________________________________________________
23
Even better than oversampling and averaging is over-
sampling and digital filtering. Averaging is just a rough
(but computationally simple) type of digital filter. Finite
impulse response (and other) digital filter algorithms are
readily available, and are useful even with slow proces-
sors if the data rate is low or the data does not need to
be processed in real-time. When using averaging, be
sure to average an odd number of samples to avoid
small offset errors caused by asymmetrical rounding.
Whether simple averaging or more complex digital fil-
tering is used, the effect of oversampling is to spread
the noise across a wider bandwidth. Digital filtering or
averaging then eliminates the portion of this noise that
lies above the filter’s passband, leaving less noise in
the passband than if oversampling was not used. An
additional benefit of oversampling is that it simplifies
the design or choice of an anti-aliasing pre-filter for the
input. You can use a filter with a more gradual rolloff,
because the sample rate is much higher than the fre-
quency of interest.
CK
(2 x CLK)
J
Q
+5V
K
CLK
BP/UP/SHDN
CK
2 x CLK
1/2 74HC73
Q
(CLK)
J
(CLOCK SHUTDOWN)
MAX195
CLOCK SHUTDOWN
Figure 24. Circuit to Stop Free-Running Asynchronous CLK
-150
-130
-110
-90
0
5
10
20
25
40
-30
-50
-70
-10
FREQUENCY (kHz)
SIGNAL
AMPLITUDE
(dB)
15
30
35
fIN = 1kHz
fS = 85kHz
TA = +25°C
Figure 25. MAX195 FFT Plot
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