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參數(shù)資料
| 型號： | ISO809 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Isolated 16-Bit Sampling Analog-To-Digital Converter(隔離的16位采樣A\D轉換器) |
| 中文描述： | 隔離16位采樣模擬到數(shù)字轉換器（隔離的16位采樣阿\\?轉換器） |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 155K |
| 代理商： | ISO809 |
5
ISO809
1
MSB Valid
R/C
DATACLK
SDATA
t
8
t
11
t
10
t
9
2
3
15
16
Bit 14 Valid
Bit 1 Valid
Bit 13 Valid
LSB Valid
t
2
t
3
BUSY
FIGURE 1. Basic Conversion Timing.
MODE Acquire
t
4
t
5
t
1
t
3
t
7
t
6
Convert
Acquire
t
2
BUSY
R/C
FIGURE 2. Serial Data Timing.
SPECIFIC FUNCTION
R/C
BUSY
DATACLK
SB/BTC
OPERATION
TABLE III. Control Truth Table.
Initiate Conversion and Output Data
0
1
Output
X
Initiates Conversion “n”. Data from conversion “n–1” clocked out
on DATA synchronized to 12 clock pulses output on DATACLK.
1 > 0
1
Output
X
Initiates Conversion “n”. Data from conversion “n–1” clocked out
on DATA synchronized to 12 clock pulses output on DATACLK.
Incorrect Conversions
0
0 > 1
X
X
R/C must be HIGH or a new conversion will be initiated without
time for acquisition.
Selecting Output Format
X
X
X
0
Serial Data is output in Binary Two’s Complement format.
X
X
X
1
Serial Data is output in Straight Binary format.
ANALOG INPUT
BINARY TWO’S COMPLEMENT
(SB/BTC LOW)
STRAIGHT BINARY
(SB/BTC HIGH)
DIGITAL OUTPUT
TABLE IV. Output Codes and Ideal Input Voltages.
HEX
CODE
HEX
CODE
DESCRIPTION
BINARY CODE
BINARY CODE
Full-Scale Range
±
10
±
5
±
3.33V
0V to 10V
0V to 5V
0V to 4V
Least Significant Bit (LSB)
305
μ
V
153
μ
V
102
μ
V
153
μ
V
76
μ
V
61
μ
V
+Full Scale (FS – 1LSB)
9.999695V
4.999847V 3.333231V
9.999847V 4.999924V 3.999939V
0111 1111 1111 1111
7FFF
1111 1111 1111 1111
FFFF
Midscale
0V
0V
0V
5V
2.5V
2V
0000 0000 0000 0000
0000
1000 0000 0000 0000
8000
One LSB Below Midscale
–305
μ
V
–153
μ
V
–102
μ
V
4.999847V 2.499924V 1.999939V
1111 1111 1111 1111
FFFF
0111 1111 1111 1111
7FFF
–Full Scale
–10V
–5V
–3.333333V
0V
0V
0V
1000 0000 0000 0000
8000
0000 0000 0000 0000
0000
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