參數資料
型號： EVAL-AD7794EBZ
廠商： Analog Devices Inc
文件頁數： 7/37頁
文件大?。?/td> 0K
描述： BOARD EVALUATION FOR AD7794
產品培訓模塊： ADC Applications
ADC Architectures
ADC DC/AC Performance
標準包裝： 1
ADC 的數量： 1
位數： 24
采樣率（每秒）： 470
數據接口： SPI?、QSPI?、MICROWIRE? 和 DSP
輸入范圍： ±VREF/增益
在以下條件下的電源（標準）： 2.5mW @ 470SPS
工作溫度： -40°C ~ 105°C
已用 IC / 零件： AD7794
已供物品： 板，纜線，CD
相關產品： AD7794CRUZ-REEL-ND - IC ADC 24BIT 6CH LP 24-TSSOP
AD7794CRUZ-ND - IC ADC 24BIT 6CH LP 24-TSSOP
AD7794BRU-ND - IC ADC 24BIT 6CH LP 24-TSSOP
AD7794BRUZ-REEL-ND - IC ADC 24BIT 6CH LP 24-TSSOP
AD7794BRU-REEL-ND - IC ADC 24BIT 6CH LP 24-TSSOP
AD7794BRUZ-ND - IC ADC 24BIT SIG-DEL 6CH 24TSSOP
AD7794/AD7795
Rev. D | Page 14 of 36
Internal Reference
Table 8 shows the AD7794/AD7795 rms noise for some of the
update rates and gain settings. The numbers given are for the
bipolar input range with the internal 1.17 V reference. These
numbers are typical and are generated with a differential input
voltage of 0 V. Table 9 and Table 10 show the effective resolution
while the output peak-to-peak (p-p) resolution is listed in brackets.
It is important to note that the effective resolution is calculated
using the rms noise while the p-p resolution is calculated based
on peak-to-peak noise. The p-p resolution represents the
resolution for which there is no code flicker. These numbers are
typical and rounded to the nearest LSB.
Table 8. RMS Noise (μV) vs. Gain and Output Update Rate Using an Internal 1.17 V Reference with Chop Enabled
Update Rate (Hz)
Gain of 1
Gain of 2
Gain of 4
Gain of 8
Gain of 16
Gain of 32
Gain of 64
Gain of 128
4.17
0.81
0.67
0.32
0.2
0.13
0.065
0.04
0.039
8.33
1.18
1.11
0.41
0.25
0.16
0.078
0.058
0.059
16.7
1.96
1.72
0.55
0.36
0.25
0.11
0.088
33.2
2.99
2.48
0.83
0.48
0.33
0.17
0.13
0.12
62
3.6
3.25
1.03
0.65
0.46
0.2
0.15
123
5.83
5.01
1.69
0.96
0.67
0.32
0.25
0.26
242
11.22
8.64
2.69
1.9
1.04
0.45
0.35
0.34
470
12.46
10.58
4.58
2
1.27
0.63
0.50
0.49
Table 9.
Effective Resolution (Bits) vs. Gain and Output Update Rate for the AD7794 Using an Internal 1.17 V Reference with Chop Enabled
Update Rate (Hz)
Gain of 1
Gain of 2
Gain of 4
Gain of 8
Gain of 16
Gain of 32
Gain of 64
Gain of 128
4.17
21.5 (19)
20.5 (18)
21 (18.5)
20.5 (18)
20 (17.5)
19 (16.5)
8.33
21 (18.5)
20 (17.5)
20.5 (18)
20 (17.5)
19 (16.5)
18 (15.5)
16.7
20 (17.5)
19.5 (17)
20 (17.5)
19.5 (17)
19 (16.5)
19.5 (17)
18.5 (16)
17.5 (15)
33.2
19.5 (17)
19 (16.5)
19.5 (17)
19 (16.5)
18.5 (16)
18 (15.5)
17 (14.5)
62
19.5 (17)
18.5 (16)
19 (16.5)
18.5 (16)
18 (15.5)
17 (14.5)
123
18.5 (16)
18 (15.5)
18.5 (16)
18 (15.5)
17.5 (15)
18 (15.5)
17 (14.5)
16 (13.5)
242
17.5 (15)
17 (14.5)
17.5 (15)
17 (14.5)
17.5 (15)
16.5 (14)
15.5 (13)
470
17.5 (15)
17 (14.5)
16 (13.5)
15 (12.5)
Table 10.
Effective Resolution (Bits) vs. Gain and Output Update Rate for the AD7795 Using an Internal 1.17 V Reference with Chop Enabled
Update Rate (Hz)
Gain of 1
Gain of 2
Gain of 4
Gain of 8
Gain of 16
Gain of 32
Gain of 64
Gain of 128
4.17
16 (16)
8.33
16 (16)
16 (15.5)
16.7
16 (16)
16 (15)
33.2
16 (16)
16 (15.5)
16 (14.5)
62
16 (16)
16 (15.5)
16 (14.5)
123
16 (16)
16 (15.5)
16 (16)
16 (15.5)
16 (15)
16 (15.5)
16 (14.5)
16 (13.5)
242
16 (15)
16 (14.5)
16 (15)
16 (14.5)
16 (15)
16 (14)
15.5 (13)
470
16 (15)
16 (14.5)
16 (13.5)
15 (12.5)
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