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參數(shù)資料
| 型號(hào)： | ADS1271 |
| 元件分類： | ADC |
| 英文描述： | 24 BIT WIDE BANDWIDTH ANALOG TO DIGITAL CONVERTER |
| 中文描述： | 24位寬帶模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 20/29頁 |
| 文件大?。?/td> | 381K |
| 代理商： | ADS1271 |
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SBAS306A NOVEMBER 2004 REVISED DECEMBER 2004
www.ti.com
20
POWER-UP SEQUENCE
The analog and digital supplies should be applied before
any analog or digital input is driven. The power supplies
may be sequenced in any order. Once the supplies and the
voltage reference inputs have stabilized, data can be read
from the device.
FREQUENCY RESPONSE
The digital filter sets the overall frequency response. The filter
uses a multi-stage FIR topology to provide linear phase with
minimal passband ripple and high stopband attenuation. The
oversampling ratio of the digital filter (that is, the ratio of the
modulator sampling to the output data rate: f
MOD
/f
DATA
) is a
function of the selected mode, as shown in Table 7. f
MOD
is
CLK/2 or CLK/4, depending on the mode.
Table 7. Oversampling Ratio versus Mode
MODE
High-Speed
High-Resolution
Low-Power
OVERSAMPLING RATIO (fMOD/fDATA)
64
128
64
High-Speed and Low-Power Modes
The digital filter configuration is the same in both
High-Speed and Low-Power modes with the oversampling
ratio set to 64. Figure 48 shows the frequency response in
High-Speed and Low-Power modes
normalized to f
DATA
.
Figure 49 shows the passband ripple. The transition from
passband to stop band is illustrated in Figure 50. The
overall frequency response repeats at 64x multiples of the
modulator frequency f
MOD
, as shown in Figure 51. These
image frequencies, if present in the signal and not
externally filtered, will fold back (or alias) into the
passband, causing errors. However, with such a wide
stopband, only a simple low-order, antialias filter is
typically required in front of the ADS1271 inputs to limit
out-of-band noise. See Table 8 for more detail.
0
20
40
60
80
100
120
140
0.4
Normalized Input Frequency (f
IN
/f
DATA
)
A
0
0.2
0.6
0.8
1.0
Figure 48. Frequency Response for High-Speed
and Low-Power Modes
0.02
0
0.02
0.04
0.06
0.08
0.10
0.2
Normalized Input Frequency (f
IN
/f
DATA
)
A
0
0.1
0.3
0.4
0.5
0.6
Figure 49. Passband Response for High-Speed
and Low-Power Modes
0
1
2
3
4
5
6
7
8
9
10
Normalized Input Frequency (f
IN
/f
DATA
)
A
0.45
0.47
0.49
0.51
0.53
0.55
Figure 50. Transition Band Response for
High-Speed and Low-Power Modes
20
0
20
40
60
80
100
120
140
160
Input Frequency (f
IN
/f
DATA
)
G
0
16
32
48
64
Figure 51. Frequency Response Out to f
MOD
for
High-Speed and Low-Power Modes
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| ADS1271IPWR | 24 BIT WIDE BANDWIDTH ANALOG TO DIGITAL CONVERTER |
| ADS1271EVM-PDK | modular EVM form factor |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS1271EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS1271 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| ADS1271EVM-PDK | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS1271 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| ADS1271IBPW | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24B 105kSPS Indus Delta-Sigma ADC 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 |
| ADS1271IBPW | 制造商:Texas Instruments 功能描述:24BIT ADC 105KSPS DELTA S 16TSSOP 制造商:Texas Instruments 功能描述:24BIT ADC, 105KSPS, DELTA S, 16TSSOP 制造商:Texas Instruments 功能描述:24BIT ADC, 105KSPS, DELTA S, 16TSSOP; Resolution (Bits):24bit; Sampling Rate:105kSPS; Supply Voltage Type:Single; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Supply Current:17mA; Digital IC Case Style:TSSOP; No. of Pins:16; ;RoHS Compliant: Yes |
| ADS1271IBPWG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24B 105kSPS Indus Delta-Sigma ADC 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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