參數(shù)資料
型號： SDM873J
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)
文件頁數(shù)： 12/27頁
文件大?。?/td> 256K
代理商： SDM873J
SDM862/863/872/873
12
carried out by the ADC on a voltage from channel X held on
the sample/hold, channel Y is selected and the multiplexer
and instrumentation amplifier allowed to settle. In this way,
the total throughput time is limited only by the sum of the
sample/hold acquisition time and the ADC conversion time.
CALIBRATION – UNIPOLAR
If adjustment of unipolar offset and gain are not required,
then the gain set potentiometer in Figure 11 (Unipolar
operation) may be replaced with a 50
, 1% metal film
resistor, and the offset network replaced with a connection
from pin 23 to ground.
FIGURE 11. Unipolar Calibration.
CALIBRATION - BIPOLAR
If adjustment of bipolar offset and gain are not required then
the gain set and offset potentiometers in Figure 12 (Bipolar
operation) may both be replaced with 50
, 1% metal film
resistors.
FIGURE 12. Bipolar Calibration.
21
22
23
24
26
20V
Span
10V
Span
Inputs
SDM
(Gain)
100
(Offset)
100
CALIBRATION - GENERAL
The input voltage ranges of the ADC are 0-10V,
±
5V and
±
10V. Calibration in all ranges is achieved by adjusting the
offset and gain potentiometers (indicated in Figures 11 and
12) such that the 000 to 001 code transition takes place at
+1/2LSB from full-scale negative (–FS) and the FFE to FFF
transition takes place at –3/2LSB from full-scale positive
(+FS). The procedure is therefore to select the required range
from Figure 13, apply the specified (–FS+1/2LSB) voltage
to any selected input channel and adjust the offset potenti-
ometer for the 000 to 001 transition. The (+FS–3/2LSB)
voltage should then be applied to the same channel and the
gain potentiometer adjusted for the FFE to FFF transition.
The offset should always be made before the gain adjustment.
FULL-SCALE
RANGE
000 TO 001
TRANSITION VOLT.
FFE TO FFF
TRANSITION VOLT.
1LSB
EQUALS
0–10V
±
5V
±
10V
+0.0012V
–4.9988V
–9.9976V
+9.9963V
+4.9963V
+9.9927V
2.44mV
2.44mV
4.88mV
FIGURE 13. Code Transition Ranges.
Full-Scale
Calibration
Error
Rotates
The
Line
Offset
Error
Shifts
The Line
(Bipolar
Offset
Transaction)
Midscale
(Bipolar
Zero)
FFF
H
FFE
H
FFD
H
802
H
801
H
800
H
7FF
H
7FE
H
001
H
000
H
002
H
D
1/2LSB
Zero
(–Full Scale)
Zero
(–Full-Scale
Calibration
Transition)
1/2LSB
3/2LSB
+Full-Scale
Calibration
Transition
+Full
Scale
Analog Input
FIGURE 14. SDM Transfer Characteristic Terminology.
GROUNDING, DECOUPLING
AND LAYOUT CONSIDERATIONS
It should be noted that the multiplexer/instrumentation am-
plifier section and sample/hold plus ADC section of the
SDM have separate power connections. This is to enable
more flexible grounding techniques to be implemented,
Figures 15, 16. It also facilitates the use of independent
decoupling of the analog front-end power supply, and the
ADC plus associated digital circuitry power supply if de-
sired. In this way, a separately decoupled analog front-end
can be made to be substantially more immune to power
supply noise generated by the ADC circuitry than if the
20V
Span
10V
Span
Inputs
(Gain)
SDM
+15V
–15V
21
22
23
24
26
160
100
100k
(Offset)
100k
相關(guān)PDF資料
PDF描述
SDM873K 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS
SDM873R 16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS
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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SDM873K 制造商:BB 制造商全稱:BB 功能描述:16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS
SDM873R 制造商:BB 制造商全稱:BB 功能描述:16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS
SDM873S 制造商:BB 制造商全稱:BB 功能描述:16 Single Ended/8 Differential Input 12-BIT DATA ACQUISITION SYSTEMS
SDM8958 制造商:SAMHOP 制造商全稱:SAMHOP 功能描述:Dual E nhancement Mode Field E ffect Transistor ( N and P Channel)
SDM90-15 制造商:Kern Engineering 功能描述:Electronic Component
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