參數(shù)資料
型號(hào)： EVAL-AD7715-3EBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 3/40頁(yè)
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD7715
標(biāo)準(zhǔn)包裝： 1
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 500
數(shù)據(jù)接口： 串行
輸入范圍： ±VREF/增益
在以下條件下的電源（標(biāo)準(zhǔn)）： 5.3mW @ 3.3 V
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7715-3
已供物品： 板，CD
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AD7715
Rev. D | Page 11 of 40
TERMINOLOGY
Integral Nonlinearity
This is the maximum deviation of any code from a straight
line passing through the endpoints of the transfer function.
The endpoints of the transfer function are zero-scale (not to
be confused with bipolar zero), a point 0.5 LSB below the first
code transition (000 … 000 to 000 … 001) and Full-Scale, a
point 0.5 LSB above the last code transition (111 … 110 to 111
… 111). The error is expressed as a percentage of full scale.
Positive Full-Scale Error
Positive Full-Scale Error is the deviation of the last code
transition (111 . . . 110 to 111 . . . 111) from the ideal AIN(+)
voltage (AIN() + VREF/GAIN 3/2 LSBs). It applies to both
unipolar and bipolar analog input ranges.
Unipolar Offset Error
Unipolar Offset Error is the deviation of the first code transition
from the ideal AIN(+) voltage (AIN() + 0.5 LSB) when operating
in the unipolar mode.
Bipolar Zero Error
This is the deviation of the midscale transition (0111 . . . 111 to
1000 . . . 000) from the ideal AIN(+) voltage (AIN() 0.5 LSB)
when operating in the bipolar mode.
Gain Error
This is a measure of the span error of the ADC. It includes full-
scale errors but not zero-scale errors. For unipolar input ranges
it is defined as (full scale error—unipolar offset error) while for
bipolar input ranges it is defined as (full-scale error—bipolar
zero error).
Bipolar Negative Full-Scale Error
This is the deviation of the first code transition from the ideal
AIN(+) voltage (AIN() VREF/GAIN + 0.5 LSB), when
operating in the bipolar mode.
Positive Full-Scale Overrange
Positive full-scale overrange is the amount of overhead available
to handle input voltages on AIN(+) input greater than AIN) +
VREF/GAIN (for example, noise peaks or excess voltages due
to system gain errors in system calibration routines) without
introducing errors due to overloading the analog modulator
or overflowing the digital filter.
Negative Full-Scale Overrange
This is the amount of overhead available to handle voltages
on AIN(+) below AIN() VREF/GAIN without overloading the
analog modulator or overflowing the digital filter. Note that the
analog input accepts negative voltage peaks even in the unipolar
mode provided that AIN(+) is greater than AIN() and greater
than AGND 30 mV.
Offset Calibration Range
In the system calibration modes, the AD7715 calibrates its
offset with respect to the analog input. The offset calibration
range specification defines the range of voltages that the AD7715
can accept and still calibrate offset accurately.
Full-Scale Calibration Range
This is the range of voltages that the AD7715 can accept in the
system calibration mode and still calibrate full scale correctly.
Input Span
In system calibration schemes, two voltages applied in sequence
to the AD7715’s analog input define the analog input range. The
input span specification defines the minimum and maximum
input voltages from zero to full scale that the AD7715 can accept
and still calibrate gain accurately.
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