參數(shù)資料
型號(hào)： SDM873R
英文描述： 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS
中文描述： 16單端/ 8差分輸入12位數(shù)據(jù)采集系統(tǒng)
文件頁(yè)數(shù)： 11/27頁(yè)
文件大?。?/td> 256K
代理商： SDM873R
SDM862/863/872/873
11
below the first code transition (000
H
to 001
H
at –9.99756V)
and the plus full-scale value of +10V is 7.32mV above the
last code transition (FFE
H
to FFF
H
at +9.99268) (see Figure
13).
NO MISSING CODES
(DIFFERENTIAL LINEARITY ERROR)
A specification which guarantees no missing codes requires
that every code combination appear in a monotonically-
increasing sequence as the analog input is increased through-
out the range. Thus, every input code width (quantum) must
have a finite width. If an input quantum has a value of zero
(a differential linearity error of –1LSB), a missing code will
occur.
The SDM is guaranteed to have no missing codes to 12-bit
resolution over it’s respective specification temperature
ranges.
UNIPOLAR OFFSET ERROR
An SDM connected for unipolar operation has an analog
input range of 0V to plus full scale. The first output code
transition should occur at an analog input value 1/2LSB
above 0V. Unipolar offset error is defined as the deviation of
the actual transition value from the ideal value. The unipolar
offset temperature coefficient specifies the change of this
transition value versus a change in ambient temperature.
BIPOLAR OFFSET ERROR
A/D converter specifications have historically defined bipo-
lar offset as the first transition value above the minus full-
scale value. The SDM specification, however, follows the
terminology defined for the 574 converter several years ago.
Thus, bipolar offset is located near the midscale value of 0V
(bipolar zero) at the output code transition 7FFH to 800H.
Bipolar offset error for the SDM is defined as the deviation
of the actual transition value from the ideal transition value
located 1/2LSB below 0V. The bipolar offset temperature
coefficient specifies the maximum change of the code tran-
sition value versus a change in ambient temperature.
FULL SCALE CALIBRATION ERROR
The last output code transition (FFE
H
to FFF
H
) occurs for an
analog input value 3/2LSB below the nominal full-scale
value. The full-scale calibration error is the deviation of the
actual analog value at the last transition point from the ideal
value. The full-scale calibration temperature coefficient speci-
fies the maximum change of the code transition value versus
a change in ambient temperature.
OPERATING INSTRUCTIONS
OPERATING MODES
The SDM can operate in one of two modes, namely serial
and overlap, as shown in Figure 10. In serial mode, control
of the device is such that a multiplexer channel X is first
selected, time is then allowed for the instrumentation ampli-
fier to settle, the sample/hold amplifier is set to HOLD mode
and finally a conversion is carried out. This procedure is
then repeated for channel Y. Faster throughput can be
obtained using overlap mode. While a conversion is being
Conversion
Signal Acquisition
SERIAL MODE
Time
Signal Acquisition
Signal Acquisition
Conversion
Time
MUX
Selection
(X)
Instrumentation
Amp
Settling
Sample/
Hold
Acquisition
A/D
Conversion
Data
Valid
MUX
Selection
(Y)
MUX
Selection
(X)
Instrumentation
Amp
Settling
Sample/
Hold
Acquisition
MUX
Selection
(Y)
Instrumentation
Amp
Settling
Sample/
Hold
Acquisition
MUX
Selection
(Z)
A/D
Conversion on
Channel (X)
Data Valid
A/D
Conversion on
Channel (Y)
OVERLAP MODE
FIGURE 10. Serial and Overlap Modes of Operation.
相關(guān)PDF資料
PDF描述
SDM873S 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS
SDM863R 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS
SDM863S 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS
SDM872 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS
SDM872A 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS
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