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| 型號： | EVAL-AD7731EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Noise, High Throughput 24-Bit Sigma-Delta ADC |
| 中文描述： | 低噪聲，高吞吐量的24位Σ-Δ模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 20/44頁 |
| 文件大小： | 411K |
| 代理商： | EVAL-AD7731EB |
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AD7731
–20–
REV. 0
RE ADING FROM AND WRIT ING T O T HE ON-CHIP RE GIST E RS
T he AD7731 contains a total of twelve on-chip registers. T hese registers are all accessed over a three-wire interface. As a result,
addressing of registers is via a write operation to the topmost register on the part, the Communications Register. Figure 5 shows a
flowchart for reading from the different registers on the part summarizing the sequence and the words to be written to access each of
the registers. Figure 6 gives a flowchart for writing to the different registers on the part, again summarizing the sequence and words
to be written to the AD7731.
Byte W
(Hex)
Byte Y
(Hex)
Byte Z
(Hex)
Register
Status Register
Data Register
Mode Register
Filter Register
Offset Register
Gain Register
10
11
12
13
15
16
20
21
22
N/A*
N/A*
N/A*
30
30
30
N/A*
N/A*
N/A*
*N/A = Not Applicable. Continuous reads of these registers does
not make sense as the register contents would remain the same
since they are only changed by a write operation.
Figure 5. Flowchart for Reading from the AD7731 Registers
Register
Byte Y (Hex)
Communications Register
Data Register
Mode Register
Filter Register
Offset Register
Gain Register
T est Register
00
Read Only Register.
02
03
05
06
User is advised not
to change contents of
T est Register
Figure 6. Flowchart for Writing to the AD7731 Registers
START
WRITE BYTE W TO
COMMUNICATIONS REGISTER
(SEE ACCOMPANYING TABLE)
YES
READ REGISTER
NO
WRITE BYTE Y TO
COMMUNICATIONS REGISTER
(SEE ACCOMPANYING TABLE)
READ REGISTER
YES
NO
WRITE BYTE Z TO
COMMUNICATIONS REGISTER
(SEE ACCOMPANYING TABLE)
STOP
CONTINUOUS
READ
OPERATION
CONTINUOUS
READS OF
REGISTER
REQUIRED
START
WRITE BYTE Y TO
COMMUNICATIONS REGISTER
(SEE ACCOMPANYING TABLE)
WRITE TO REGISTER
END
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