參數(shù)資料
型號(hào)： AD7731BRZ-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 13/44頁(yè)
文件大?。?/td> 0K
描述： IC ADC 24BIT SIGMA-DELTA 24-SOIC
標(biāo)準(zhǔn)包裝： 400
位數(shù)： 24
采樣率（每秒）： 6.4k
數(shù)據(jù)接口： DSP，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 125mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 24-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 24-SOIC W
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 3 個(gè)差分，單極；3 個(gè)差分，雙極；5 個(gè)偽差分，單極；5 個(gè)偽差分，雙極
配用： EVAL-AD7731EBZ-ND - BOARD EVALUATION FOR AD7731
AD7731
–20–
REV. 0
READING FROM AND WRITING TO THE ON-CHIP REGISTERS
The AD7731 contains a total of twelve on-chip registers. These 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
Byte Y
Byte Z
Register
(Hex)
Status Register
10
20
30
Data Register
11
21
30
Mode Register
12
22
30
Filter Register
13
N/A*
Offset Register
15
N/A*
Gain Register
16
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
00
Data Register
Read Only Register.
Mode Register
02
Filter Register
03
Offset Register
05
Gain Register
06
Test Register
User is advised not
to change contents of
Test 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
REV. A
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