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MAX1032_1112 参数 Datasheet PDF下载

MAX1032_1112图片预览
型号: MAX1032_1112
PDF下载: 下载PDF文件 查看货源
内容描述: 8位和4通道, 3× VREF多量程输入,串行14位ADC [8- and 4-Channel, 3 x VREF Multirange Inputs, Serial 14-Bit ADCs]
分类和应用:
文件页数/大小: 32 页 / 889 K
品牌: MAXIM [ MAXIM INTEGRATED PRODUCTS ]
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8- and 4-Channel, 3 ꢀ ꢁREF  
Multirange Inputs, Serial 14-Bit ADCs  
Full-Power Bandwidth  
Unipolar Offset Error  
A 95% of full-scale sine wave is applied to the ADC,  
and the input frequency is then swept up to the point  
where the amplitude of the digitized conversion result  
has decreased by -3dB.  
-FSR to 0V  
When a zero-scale analog input voltage is applied to  
the converter inputs, the digital output is all ones  
(0x3FFF). Ideally, the transition from 0x3FFF to 0x3FFE  
occurs at AGND1 - 0.5 LSB. Unipolar offset error is the  
amount of deviation between the measured zero-scale  
transition point and the ideal zero-scale transition point,  
with all untested channels grounded.  
Common-Mode Rejection Ratio (CMRR)  
CMRR is the ability of a device to reject a signal that is  
“common” to or applied to both input terminals. The  
common-mode signal can be either an AC or a DC sig-  
nal or a combination of the two. CMR is expressed in  
decibels. Common-mode rejection ratio is the ratio of  
the differential signal gain to the common-mode signal  
gain. CMRR applies only to differential operation.  
0V to +FSR  
When a zero-scale analog input voltage is applied to  
the converter inputs, the digital output is all zeros  
(0x0000). Ideally, the transition from 0x0000 to 0x0001  
occurs at AGND1 + 0.5 LSB. Unipolar offset error is the  
amount of deviation between the measured zero-scale  
transition point and the ideal zero-scale transition point,  
with all untested channels grounded.  
Power-Supply Rejection Ratio (PSRR)  
PSRR is the ratio of the output-voltage shift to the  
power-supply-voltage shift for a fixed input voltage. For  
the MAX1032/MAX1033, AVDD1 can vary from 4.75V to  
5.25V. PSRR is expressed in decibels and is calculated  
using the following equation:  
2/MAX103  
Bipolar Offset Error  
When a zero-scale analog input voltage is applied to  
the converter inputs, the digital output is a one followed  
by all zeros (0x2000). Ideally, the transition from  
0x1FFF to 0x2000 occurs at (2N-1 - 0.5)LSB. Bipolar off-  
set error is the amount of deviation between the mea-  
sured midscale transition point and the ideal midscale  
transition point, with untested channels grounded.  
5.25V 4.75V  
V  
PSRR[dB] = 20 × log  
V
OUT(5.25V)  
OUT(4.75V) ⎠  
For the MAX1032/MAX1033, PSRR is tested in bipolar  
operation with the analog inputs grounded.  
Gain Error  
When a positive full-scale voltage is applied to the con-  
verter inputs, the digital output is all ones (0x3FFF). The  
transition from 0x3FFE to 0x3FFF occurs at 1.5 LSB  
below full scale. Gain error is the amount of deviation  
between the measured full-scale transition point and  
the ideal full-scale transition point with the offset error  
removed and all untested channels grounded.  
Aperture Jitter  
Aperture jitter, t , is the statistical distribution of the  
AJ  
variation in the sampling instant (Figure 21).  
Aperture Delay  
Aperture delay, t , is the time from the falling edge of  
AD  
SCLK to the sampling instant (Figure 21).  
Signal-to-Noise Ratio (SNR)  
SNR is computed by taking the ratio of the RMS signal  
to the RMS noise. RMS noise includes all spectral com-  
ponents to the Nyquist frequency excluding the funda-  
mental, the first five harmonics, and the DC offset.  
Unipolar Endpoint Overlap  
Unipolar endpoint overlap is the change in offset when  
switching between complementary input voltage  
ranges. For example, the difference between the volt-  
age that results in a 0x3FFF output in the -3 x V  
/2 to  
REF  
0V input voltage range and the voltage that results in a  
Signal-to-Noise Plus Distortion (SINAD)  
SINAD is computed by taking the ratio of the RMS sig-  
nal to the RMS noise plus distortion. RMS noise plus  
distortion includes all spectral components to the  
Nyquist frequency excluding the fundamental and the  
DC offset.  
0x0000 output in the 0 to +3 x V /2 input voltage  
REF  
range is the unipolar endpoint overlap. The unipolar  
endpoint overlap is positive for the MAX1032/MAX1033,  
preventing loss of signal or a dead zone when switch-  
ing between adjacent analog input voltage ranges.  
Small-Signal Bandwidth  
Signal  
Noise  
A 100mV  
sine wave is applied to the ADC, and the  
RMS  
P-P  
SINAD(dB) = 20 × log  
input frequency is then swept up to the point where the  
amplitude of the digitized conversion result has  
decreased by -3dB.  
RMS  
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