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參數(shù)資料
| 型號： | AB-117 |
| 文件頁數(shù)： | 3/3頁 |
| 文件大?。?/td> | 46K |
| 代理商： | AB-117 |
3
For a temperature range of 0
°
C to 1000
°
C, the delta voltage
change of the “E” type thermocouple is 58mV. The output
voltage of the multiplexer is filtered and buffered by a single
supply op amp, U
2
. The affect of changing the reference
voltage is summarized in Table III and Table IV.
Although a thermocouple was used to illustrate the function
of this circuit, other sensing devices can also be used making
the multiplexer more useful. With this simple circuit the
digital control can vary the gain coefficient from 1 to 50X.
DIFFERENTIAL
±
0.50V
LSB
244
μ
VIRTUAL
14.3 Bits
17.6 Bits
V
REF
0.30V
INPUT
±
0.30V
VOLTAGE OF
146
μ
V
ACCURACY
15 Bits
EFFECTIVE
8.33
INPUT
VOLTAGE RANGE
ADS7817
TO 5V FSR
GAIN
2.50V
0.20V
±
2.50V
±
0.10V
1220
μ
V
49.0
μ
V
12 Bits
15.7 Bits
1.00
12.50
1.25V
0.10V
±
1.25V
±
0.05V
612
μ
V
24.5
μ
V
13 Bits
16.3 Bits
2.00
25.00
0.50V
0.05V
5.00
50.00
±
0.20V
97.6
μ
V
LSB
VIRTUAL
ACCURACY
TO 5V FSR
V
INPUT
VOLTAGE OF
ADS7816
EFFECTIVE
GAIN
5.00V
1220
μ
V
12 Bits
1.00
3.75V
916
μ
V
12.5 Bits
1.33
2.50V
610
μ
V
13 Bits
2.00
1.25V
305
μ
V
14 bits
4.00
0.50V
122
μ
V
15.3 Bits
10.00
0.30V
73.2
μ
V
16 Bits
16.67
0.20V
48.8
μ
V
16.7 Bits
25.00
0.10V
24.5
μ
V
17.6 Bits
50.00
TABLE III. By Decreasing V
REF
, the Input Range of the
ADS7816 Decreases One for One. The effective
resolution remains at 12 bits, however, com-
pared to a 5V FSR system the virtual accuracy is
improved. The ‘Virtual Resolution’ shown in
this table does not account for noise in the
system, which could reduce the accuracy of the
device (particularly at lower values of V
REF
).
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
TABLE IV. The Input Range of the ADS7817 is Equal to
Twice of the Reference Voltage. By decreasing
V
REF
, the input range of the ADS7817 decreases
proportionally. The effective resolution remains
at 12 bits. Compared to a 5V FSR system the
virtual accuracy is improved. The ‘Virtual Reso-
lution’ shown in this table does not account for
noise in the system, which could reduce the
accuracy of the device (particularly at lower
values of V
REF
).
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相關(guān)代理商/技術(shù)參數(shù) |
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