參數(shù)資料
型號： ADS1255
英文描述： Very Low Noise, 24-Bit Analog-to-Digital Converter
中文描述： 極低噪聲，24位模擬數(shù)字轉(zhuǎn)換器
文件頁數(shù)： 19/39頁
文件大?。?/td> 427K
代理商： ADS1255
SBAS288D JUNE 2003 REVISED AUGUST 2004
www.ti.com
19
FREQUENCY RESPONSE
The low-pass digital filter sets the overall frequency
response for the ADS1255/6. The filter response is the
product of the responses of the fixed and programmable
filter sections and is given by Equation 2.
|H(
f
)|
H
sinc5
(
f
)
·
H
Averager
(
f
)
5
·
Num_Ave
·
sin
sin
256
·
f
f
CLKIN
64
·
sin
4
·
f
f
CLKIN
sin
256
·
Num_Ave
f
f
CLKIN
256
·
f
f
CLKIN
The digital filter attenuates noise on the modulator output,
including noise from within the ADS1255/6 and external
noise present on the ADS1255/6 input signal. Adjusting
the filtering by changing the number of averages used in
the programmable filter changes the filter bandwidth. With
a higher number of averages, bandwidth is reduced and
more noise is attenuated.
The low-pass filter has notches (or zeros) at the data
output rate and multiples thereof. At these frequencies, the
filter has zero gain. This feature can be useful when trying
to eliminate a particular interference signal. For example,
to eliminate 60Hz (and the harmonics) pickup, set the data
rate equal to 2.5SPS, 5SPS, 10SPS, 15SPS, 30SPS, or
60SPS. To help illustrate the filter characteristics,
Figure 14 and Figure 15 show the responses at the data
rate extremes of 30kSPS and 2.5SPS respectively.
Table 12 summarizes the first-notch frequency and 3dB
bandwidth for the different data rate settings.
0
20
40
60
80
100
120
140
G
0
15
30
45
60
75
90
105
120
Frequency (kHz)
f
DATA
= 30kSPS
Figure 14. Frequency Response for
Data Rate = 30kSPS
0
6
12
18
24
30
36
42
48
54
60
G
0
15
20
10
5
25
30
35
40
45
50
60
55
Frequency (Hz)
f
DATA
= 2.5SPS
Figure 15. Frequency Response for
Data Rate = 2.5SPS
Table 12. First Notch Frequency and
3dB Filter Bandwidth
DATA RATE
(SPS)
30,000
15,000
7500
3750
2000
1000
500
100
60(1)
50(2)
30(1)
25(2)
15(1)
10(3)
5(3)
2.5(3)
FIRST NOTCH
(Hz)
30,000
15,000
7500
3750
2000
1000
500
100
60
50
30
25
15
10
5
2.5
3dB BANDWIDTH
(Hz)
6106
4807
3003
1615
878
441
221
44.2
26.5
22.1
13.3
11.1
6.63
4.42
2.21
1.1
NOTE: fCLKIN = 7.68MHz.
(1)Notch at 60Hz.
(2)Notch at 50Hz.
(3)Notch at 50Hz and 60Hz.
The digital filter low-pass characteristic repeats at
multiples of the modulator rate of f
CLKIN
/4. Figure 16 and
Figure 17 show the responses plotted out to 7.68MHz at
the data rate extremes of 30kSPS and 2.5SPS. Notice
how the responses near DC, 1.92MHz, 3.84MHz,
(2)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS1255IDB 制造商:BB 制造商全稱:BB 功能描述:Very Low Noise, 24-Bit Analog-to-Digital Converter
ADS1255IDBR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24 Bit 30kSPS Very Lo-Noise Delta-Sigma 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS1255IDBRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24 Bit 30kSPS Very Lo-Noise Delta-Sigma 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS1255IDBT 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24 Bit 30kSPS Very Lo-Noise Delta-Sigma 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS1255IDBT 制造商:Texas Instruments 功能描述:ADC 24BIT 5V SPI 30MSPS 20SSOP 制造商:Texas Instruments 功能描述:ADC, 24BIT, 5V, SPI, 30MSPS, 20SSOP 制造商:Texas Instruments 功能描述:ADC, 24BIT, 5V, SPI, 30MSPS, 20SSOP; Resolution (Bits):24bit; Sampling Rate:30kSPS; Supply Voltage Type:Single; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Supply Current:36mA; Digital IC Case Style:SSOP; No. of Pins:20; ;RoHS Compliant: Yes 制造商:Texas Instruments 功能描述:ADC, 24BIT, 5V, SPI, 30KSPS, 20SSOP ;ROHS COMPLIANT: YES
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