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參數(shù)資料
| 型號(hào)： | AD7760BCP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 2.5 MSPS, 20-Bit ADC |
| 中文描述： | 1-CH 20-BIT DELTA-SIGMA ADC, PARALLEL ACCESS, QCC48 |
| 封裝： | LFCSP-48 |
| 文件頁數(shù)： | 19/22頁 |
| 文件大小： | 868K |
| 代理商： | AD7760BCP |
Preliminary Technical Data
AD7760
Table 11 shows the Hex values (in sign and magnitude format)
that are downloaded to the AD7760 to realize this filter. The
table is also split into the bytes which are all summed to
produce the checksum. The checksum generated from these
coefficients is 0x0E6B.
Rev. PrN | Page 19 of 22
Table 11. Filter Hex Values
Coeff
1
2
3
4
5
6
7
8
9
10
11
12
Word 1
Word 2
Byte 1
03
01
00
04
04
00
00
00
04
04
04
04
Byte 2
2B
BF
15
A8
5F
2C
50
10
2F
37
1B
04
Byte 3
96
18
66
1E
2A
49
E9
DB
DE
44
7D
3B
Byte 4
88
3C
26
6A
96
C2
F6
D8
54
5A
6E
5F
What follows is a list of 16-bit words that the user would write
to the AD7760 to set up the ADC and download this filter
assuming an output data rate of 1.25MHz has already been
selected.
0x0001 Address of Control Register 1
0x8079 Control Reg Data; DL Filter, Set Filter Length = 24, Set
Output Data Rate = 1.25MHz
0x032B First Coefficient, Word 1
0x9688 First Coefficient, Word 2
0x01BF Second Coefficient, Word 1
0x183C Second Coefficient, Word 2
…
…
0x0404 Twelfth (Final) Coefficient, Word 1
0x3B5F Final Coefficient, Word 2
0x0E6B Checksum
Wait TBD xS for AD7760 to fill remaining unused coefficients
with zeros.
0x0001 Address of Control Register
0x0879 Control Reg Data; Set Read Status and maintain filter
length and decimation settings.
Read contents of Status Register. Check Bit 7 (DL_OK) to
determine that the filter was downloaded correctly.
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