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參數(shù)資料
| 型號： | ADS1244EVM |
| 廠商： | Texas Instruments |
| 文件頁數(shù)： | 24/24頁 |
| 文件大小： | 0K |
| 描述： | EVALUATION MODULE FOR ADS1244 |
| 產(chǎn)品培訓(xùn)模塊： | Data Converter Basics |
| 視頻文件： | Nuts and Bolts of the Delta-Sigma Converter |
| 標準包裝： | 1 |
| ADC 的數(shù)量： | 2 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 15 |
| 數(shù)據(jù)接口： | 串行 |
| 輸入范圍： | 0 ~ 5 V |
| 在以下條件下的電源（標準）： | 150mW @ 500kSPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | ADS1244 |
| 已供物品： | 板 |
| 產(chǎn)品目錄頁面： | 889 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)品： | ADS1244IDGSTG4-ND - IC ADC LP CONVERT 24BIT 10-MSOP ADS1244IDGSRG4-ND - IC ADC LP CONVERT 24BIT 10-MSOP ADS1244IDGSR-ND - IC ADC LP CONVERT 24BIT 10-MSOP 296-14003-6-ND - IC ADC LP 24-BIT 10-MSOP 296-14003-2-ND - IC ADC LP 24-BIT 10-MSOP 296-14003-1-ND - IC ADC LP 24-BIT 10-MSOP |
| 其它名稱： | 296-18359 |
ADS1244
9
SBAS273
www.ti.com
To help see the response at lower frequencies, Figure 7
illustrates the response out to 180Hz. Notice that both 50Hz
and 60Hz signals are rejected. This feature is very useful for
eliminating power line cycle interference during measure-
ments. Figure 8 shows the ADS1244’s response around
these frequencies.
The ADS1244’s data rate and frequency response scale
directly with CLK frequency. For example, if fCLK increases
from 2.4576MHz to 4.9152MHz, the data rate increases from
15sps to 30sps while the notches in the response at 50Hz
and 60Hz move out to 100Hz and 120Hz.
SETTLING TIME
The ADS1244 has single-cycle settling. That is, the output
data is fully settled after a single conversion—there is no
need to wait for additional conversions before retrieving the
data when there is a change on the analog inputs.
In order to realize single-cycle settling, synchronize changes
on the analog inputs to the conversion beginning, which is
indicated by the falling edge of DRDY/DOUT. For example,
when using a multiplexer in front of the ADS1244, change the
multiplexer’s inputs when DRDY/DOUT goes LOW. Increas-
ing the time between the conversion beginning and the
change on the analog inputs (tDELAY) will result in a settling
error in the conversion data, as shown in Figure 9. The
settling error versus delay time is shown in Figure 10. If the
input change is delayed to the point where the settling error
is too high, simply ignore the first data result and wait for the
second conversion which will be fully-settled.
FIGURE 9. Analog Input Change Timing.
Begin New Conversion,
Complete Previous Conversion
New Conversion Complete
t
DELAY
DRDY/DOUT
V
IN
Previous Conversion Data
FIGURE 10. Settling Error vs Delay Time.
SETTLING ERROR vs DELAY TIME
f
CLK = 2.4576MHz
Delay Time, t
DELAY (ms)
Settling
Error
(%)
2
4
6
8
10
12
14
16
0
10.000000
1.000000
0.100000
0.010000
0.001000
0.000100
0.000010
0.000001
FIGURE 7. Frequency Response to 180Hz.
FIGURE 8. Frequency Response Near 50Hz and 60Hz.
FREQUENCY RESPONSE TO 180Hz
f
CLK = 2.4576MHz
Frequency (Hz)
Gain
(dB)
0
10
20
30
40
50
60
70
80
90
100
11
0
120
130
140
150
160
170
180
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
FREQUENCY RESPONSE NEAR 50Hz AND 60Hz
f
CLK = 2.4576MHz
Frequency (Hz)
Gain
(dB)
50
55
60
65
45
–40
–50
–60
–70
–80
–90
–100
–110
–120
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS1244-EVM | 制造商:BB 制造商全稱:BB 功能描述:Low-Power, 24-Bit ANALOG-TO-DIGITAL CONVERTER |
| ADS1244IDGSR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-Bit Delta-Sigma 15SPS w/50-60Hz rej RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS1244IDGSRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-Bit Delta-Sigma 15SPS w/50-60Hz rej RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS1244IDGST | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-Bit Delta-Sigma 15SPS w/50-60Hz rej RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS1244IDGSTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24-Bit Delta-Sigma 15SPS w/50-60Hz rej RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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