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AD671KD-750 数据表(PDF) 11 Page - Analog Devices

部件名 AD671KD-750
功能描述  Monolithic 12-Bit 2 MHz A/D Converter
Download  16 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD671KD-750 数据表(HTML) 11 Page - Analog Devices

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AD671
REV. B
–11–
MSB
OTR
MSB
OVER = "1"
UNDER = "1"
Figure 11. Overrange or Underrange Logic
OUTPUT DATA FORMAT
The AD671 provides both MSB and MSB outputs, delivering
data in positive true straight binary for unipolar input ranges
and positive true offset binary or twos complement for bipolar
input ranges. Straight binary coding is used for systems that ac-
cept positive-only signals. If straight binary coding is used with
bipolar input signals a 0 V input would result in a binary output
of 2048. The application software would have to subtract 2048
to determine the true input voltage. Most processors typically
perform math on signed integers and assume data is in that for-
mat. Twos complement format minimizes software overhead
which is especially important in high speed data transfers, such
as a DMA operation. The CPU is not bogged down performing
data conversion steps, hence increasing the total system
throughput.
Table III. Output Data Format
Input
Analog
Digital
Range
Coding
Input
1
Output
OTR
2
0 to +5 V
Straight Binary
≤ –0.00061 V
0000 0000 0000
1
0 V
0000 0000 0000
0
+5 V
1111 1111 1111
0
>+5.00061 V
1111 1111 1111
1
0 to +10 V
Straight Binary
≤ –0.00122 V
0000 0000 0000
1
0 V
0000 0000 0000
0
+10 V
1111 1111 1111
0
≥ +10.00122 V
1111 1111 1111
1
–5 V to +5 V
Offset Binary
≤ –5.00122 V
0000 0000 0000
1
–5 V
0000 0000 0000
0
0 V
1000 0000 0000
0
+4.99756 V
1111 1111 1111
0
≥ +4.99878 V
1111 1111 1111
1
–5 V to +5 V
2s Complement
≤ –5.00122 V
1000 0000 0000
1
(Using MSB)
–5 V
1000 0000 0000
0
0 V
0000 0000 0000
0
+4.99756 V
0111 1111 1111
0
≥ +4.99878 V
0111 1111 1111
1
NOTES
1Voltages listed are with offset and gain errors adjusted to zero.
2Typical performance.
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
1k
10k
100k
1M
10M
CONVERSION RATE – Hz
CL = 0pF
CL = 30pF
CL = 50pF
Figure 12. ILOGIC vs. Conversion Rate for Various
Capacitive Loads on the Digital Outputs
ILOGIC vs. CONVERSION RATE
Figure 12 shows the typical logic supply current vs. conversion
rate for various capacitive loads on the digital outputs.


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