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參數(shù)資料
| 型號(hào)： | EVAL-AD7763EDZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 19/33頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL CONTROL AD7763 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 625k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 輸入范圍： | ±3.25 Vpp |
| 在以下條件下的電源（標(biāo)準(zhǔn)）： | 955.5mW @ 625kSPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7763 |
| 已供物品： | 板，CD |
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Data Sheet
AD7763
Rev. B | Page 25 of 32
DOWNLOADING A USER-DEFINED FILTER
As discussed in the Programmable FIR Filter section, each of
the filter coefficients is 27 bits in length: one sign bit and 26 magni-
tude bits. To download coefficients for a user-specific FIR filter, a
32-bit word is written to the AD7763 for each coefficient.
D31
D30
D29
D28
D27
D26
D[25:0]
ALL
ADR2
ADR1
ADR0
0
Sign
Magnitude
When a user writes coefficients to one device, the address of that
particular device (as assigned by the ADR[2:0] pins) must be
specified in the bits labeled ADR[2:0].
In a configuration where more than one device shares the same SDI
line, setting the ALL bit to logic high and leaving Address Bits
ADR[2:0] logic low enables the user to write each coefficient to all
devices simultaneously.
To ensure that a filter is downloaded correctly, a checksum must
be generated and downloaded following the download of the final
coefficient. The checksum is a 16-bit word generated by splitting
each 32-bit word into 4 bytes and summing all bytes from all
coefficients up to a maximum of 192 bytes (maximum number
of coefficients = 48 bytes × 4 bytes written for each coefficient).
The checksum is written to the device in the form of a 32-bit word
in the following format:
D31
D30
D29
D28
D[27:16]
D[15:0]
ALL
ADR2
ADR1
ADR0
0
Checksum
Note that when writing the checksum, the addressing requirements
are as before, and Bit 27 to Bit 16 are all set to 0.
The same checksum is generated internally in the AD7763 and
compared with the checksum downloaded. The DL_OK bit in
the status register is set if these two checksums agree.
To download a user-defined filter:
1. Write to Control Register 1, setting the DL Filt bit.
The correct Filter Length Bits FLEN[3:0] correspond
to the length of the filter about to be downloaded
(see Table 13) and the correct decimation rate.
2. Write the 32-bit word (as per format specified). The
first coefficient to be written must be the one adjacent
to the point of filter symmetry.
3. Repeat Step 2 for each coefficient.
4. Implement the checksum write as per the specified
format.
5. Use the following methods to verify that the filter
coefficients have been downloaded correctly:
Read the status register, checking the DL_OK bit.
Start reading data and observe the status of the
DL_OK bit.
Note that because the user coefficients are stored in RAM, they
are cleared after a RESET operation or a loss of power.
Table 13. Filter Length Values
FLEN[3:0]
Number of Coefficients
Filter Length
0000
Default
0001
6
12
0011
12
24
0101
18
36
0111
24
48
1001
30
60
1011
36
72
1101
42
84
1111
48
96
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