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| 型号： | EVAL-AD7708EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 38/44页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD7708 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 16 |
| 采样率（每秒）： | 1.37k |
| 数据接口： | 串行 |
| 输入范围： | ±2.5 V |
| 在以下条件下的电源（标准）： | 3.84mW @ 3V |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7708 |
| 已供物品： | 板，CD |
| 相关产品： | AD7708BRZ-ND - IC ADC 16BIT R-R 8/10CH 28SOIC AD7708BRUZ-REEL7-ND - IC ADC 16BIT R-R 8/10CH 28TSSOP AD7708BRZ-REEL7-ND - IC ADC 16BIT R-R 8/10CH 28SOIC AD7708BRZ-REEL-ND - IC ADC 16BIT R-R 8/10CH 28SOIC AD7708BRUZ-REEL-ND - IC ADC 16BIT R-R 8/10CH 28TSSOP AD7708BRUZ-ND - IC ADC 16BIT R-R 8/10CH 28-TSSOP AD7708BRU-REEL7-ND - IC ADC 16BIT R-R 8/10CH 28-TSSOP AD7708BRU-REEL-ND - IC ADC 16BIT R-R 8/10CH 28-TSSOP AD7708BRU-ND - IC ADC 16BIT R-R 8/10CH 28-TSSOP AD7708BR-REEL7-ND - IC ADC 16BIT R-R 8/10CH 28-SOIC 更多... |
| 其它名称： | EVAL-AD7708EB EVAL-AD7708EB-ND |
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REV. 0
AD7708/AD7718
–43–
Table XXI. Normal Mode 50 Hz and 60 Hz Rejection vs. Settling Time and Update Rate for a Selection of SF Words
CHOP Disabled
CHOP Enabled
50 Hz
1 Hz
60 Hz
1 Hz
50 Hz
1 Hz
60 Hz
1 Hz
SF
Rejection
Word
fADC (Hz)
tSETTLE (ms)
(dB)
fADC (Hz)
tSETTLE (ms) (dB)
(dB)
03
1365.33
2.20
0.05
0.08
N/A
13
315.08
9.52
1
1.5
105.03
19.04
21
13.6
69
59.36
50.54
42
94
19.79
101
60
94
75
54.6
54.93
57
60
18.2
110
62
66
82
49.95
60
100
16.65
180
100
53
151
27.13
110.6
60
9.04
221
72
63
255
16.06
186.76
77
68
5.35
373.5
93
68
Optimizing Throughput while Maximizing 50 Hz and 60 Hz
Rejection in a Multiplexed Data Acquisition System
The AD7708/AD7718 can be optimized for one of two modes
of operation. Operating the AD7708/AD7718 with chopping
enabled (
CHOP = 0) optimizes the AD7708/AD7718 for analog
performance over channel throughput. Output data rates vary
from 5.35 Hz (186.77 ms) to 105.03 Hz (9.52 ms). Optimum
performance, in terms of minimizing offset error and offset and
gain drift performance, is achieved as a result of chopping the
signal chain.
With chopping disabled the available output rates vary from
16.06 Hz (62.26 ms) to 1365.33 Hz (0.73 ms). The range of
applicable SF words is from 3 to 255. When the chopping is
disabled the channel output data rate is increased by a factor of
3 compared to the situation when chopping is enabled is
disabled. When used in multiplexed applications, operation
with chop disabled will offer the best throughput time when
cycling through all channels. The drawback with chopping
disabled is that the drift performance is degraded and calibra-
tion is required following gain and temperature changes. One
of the key requirements in these applications is to optimize the SF
word to obtain the maximum filter rejection at 50 Hz and 60 Hz
while minimizing the channel throughput rate. This is achieved
with an SF word of 75 giving 57 dB rejection at 50 Hz and
60 dB rejection at 60 Hz while offering a channel throughput
time of 55 ms.
Using a higher SF word of 151, 50 Hz and 60 Hz rejection can
be maximized at 60 dB with a channel throughput rate of 110 ms.
An SF word of 255 gives maximum rejection at both 50 Hz
and 60 Hz, but the channel throughput rate is restricted to
186 ms. Table XXI gives a quick comparison of normal mode 50 Hz
and 60 Hz rejection, settling time, and update rate for a selec-
tion of SF words with both chopping enabled and disabled.
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