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参数资料
| 型号： | EVAL-AD7763EDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 18/33页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL CONTROL AD7763 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 625k |
| 数据接口： | 并联 |
| 输入范围： | ±3.25 Vpp |
| 在以下条件下的电源（标准）： | 955.5mW @ 625kSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7763 |
| 已供物品： | 板，CD |
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AD7763
Data Sheet
Rev. B | Page 24 of 32
PROGRAMMABLE FIR FILTER
As discussed in the Theory of Operation section, the third FIR
filter on the AD7763 can be programmed by the user. The default
coefficients that are loaded on reset are shown in Table 12. This
gives the frequency response shown in Figure 37. The frequencies
shown in Figure 37 scale directly with the output data rate.
Table 12. Default Filter Coefficients
#
Decimal
Value
Hex
Value
#
Decimal
Value
Hex
Value
0
+53656736
332BCA0
24
+700847
AB1AF
1
+25142688
17FA5A0
25
70922
401150A
2
4497814
444A196
26
583959
408E917
3
11935847
4B62067
27
175934
402AF3E
4
1313841
4140C31
28
+388667
5EE3B
5
+6976334
6A734E
29
+294000
47C70
6
+3268059
31DDDB
30
183250
402CBD2
7
3794610
439E6B2
31
302597
4049E05
8
3747402
4392E4A
32
+16034
3EA2
9
+1509849
1709D9
33
+238315
3A2EB
10
+3428088
344EF8
34
+88266
158CA
11
+80255
1397F
35
143205
4022F65
12
2672124
428C5FC
36
128919
401F797
13
1056628
4101F74
37
+51794
CA52
14
+1741563
1A92FB
38
+121875
1DC13
15
+1502200
16EBF8
39
+16426
402A
16
835960
40CC178
40
90524
401619C
17
1528400
4175250
41
63899
400F99B
18
+93626
16DBA
42
+45234
B0B2
19
+1269502
135EFE
43
+114720
1C020
20
+411245
6466D
44
+102357
18FD5
21
864038
40D2F26
45
+52669
CDBD
22
664622
40A242E
46
+15559
3CC7
23
+434489
6A139
47
+1963
7AB
The default filter should be sufficient for most applications. It is
a standard brick wall filter with a symmetrical impulse response.
The default filter has a length of 96 taps and is nonaliasing, with
120 dB of attenuation at Nyquist. This filter not only performs
signal antialiasing but also suppresses out-of-band quantization
noise produced by the analog-to-digital conversion process. Any
significant relaxation in the stop-band attenuation or transition
bandwidth relative to the default filter can result in failure to
meet the SNR specifications.
To create a user-defined filter, note the following:
The filter must be even, symmetrical FIR.
The coefficients are 27 bits in length. All coefficients are
in sign-and-magnitude format. The sign bit coded as
positive = 0 is followed by 26 magnitude bits.
The filter length must be between 12 taps and 96 taps in
steps of 12.
Because the filter is symmetrical, the number of coefficients
that must be downloaded is half the filter length. The default
filter coefficients are an example of this, with only 48
coefficients listed for a 96-tap filter.
Coefficients are written from the center of impulse response
(adjacent to the point of symmetry) outward.
The coefficients are scaled so that the in-band gain
of the filter is equal to 134217726, with the coefficients
rounded to the nearest integer. For a low-pass filter, this is the
equivalent of having the coefficients sum arithmetically
(including sign) to +67108863 (0x3FFFFFF) positive value
over the half-impulse-response coefficient set (maximum 48
coefficients). Any deviation from this results in the
introduction of a gain error.
–20
–40
–60
–80
–100
–120
–140
–160
0
100
400
500
300
200
600
FREQUENCY (kHz)
AM
P
L
IT
UDE
(
d
B
)
0
05
47
6-
02
2
–0.1dB FREQUENCY = 251kHz
PASS-BAND RIPPLE = 0.05dB
STOP BAND = 312.5kHz
–3dB FREQUENCY = 265kHz
Figure 37. Default Filter Frequency Response (625 kHz ODR)
To download a user-defined filter, see the Downloading a User-
Defined Filter section.
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