參數(shù)資料
型號： ADS1256IDB
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)： 12/39頁
文件大?。?/td> 427K
代理商： ADS1256IDB
SBAS288D JUNE 2003 REVISED AUGUST 2004
www.ti.com
12
NOISE PERFORMANCE
The ADS1255/6 offer outstanding noise performance that
can be optimized by adjusting the data rate or PGA setting.
As the averaging is increased by reducing the data rate,
the noise drops correspondingly. The PGA reduces the
input-referred noise when measuring lower level signals.
Table 1 through Table 6 summarize the typical noise
performance with the inputs shorted externally. In all six
tables, the following conditions apply: T = +25
°
C,
AVDD = 5V, DVDD = 1.8V, V
REF
= 2.5V, and f
CLKIN
=
7.68MHz. Table 1 to Table 3 reflect the device input buffer
enabled. Table 1 shows the rms value of the input-referred
noise in volts. Table 2 shows the effective number of bits
of resolution (ENOB), using the noise data from Table 1.
ENOB is defined as:
ENOB
ln FSR RMS Noise
ln(2)
where FSR is the full-scale range. Table 3 shows the
noise-free bits of resolution. It is calculated with the same
formula as ENOB except the peak-to-peak noise value is
used instead of rms noise. Table 4 through Table 6 show
the same noise data, but with the input buffer disabled.
Table 1. Input Referred Noise (
μ
V, rms)
with Buffer On
DATA
RATE
(SPS)
PGA
1
2
4
8
16
32
64
2.5
5
10
15
25
30
50
60
100
500
1000
2000
3750
7500
15,000
30,000
0.247
0.301
0.339
0.401
0.494
0.533
0.629
0.692
0.875
1.946
2.931
4.173
5.394
7.249
9.074
10.728
0.156
0.175
0.214
0.264
0.305
0.335
0.393
0.438
0.589
1.250
1.891
2.589
3.460
4.593
5.921
6.705
0.080
0.102
0.138
0.169
0.224
0.245
0.292
0.321
0.409
0.630
1.325
1.827
2.376
3.149
3.961
4.446
0.056
0.076
0.106
0.126
0.149
0.176
0.216
0.233
0.305
0.648
1.070
1.492
1.865
2.436
2.984
3.280
0.043
0.061
0.082
0.107
0.134
0.138
0.168
0.184
0.229
0.497
0.689
0.943
1.224
1.691
2.125
2.416
0.037
0.045
0.061
0.085
0.102
0.104
0.136
0.146
0.170
0.390
0.512
0.692
0.912
1.234
1.517
1.785
0.033
0.044
0.061
0.073
0.093
0.106
0.122
0.131
0.169
0.367
0.486
0.654
0.906
1.187
1.515
1.742
Table 2. Effective Number of Bits (ENOB, rms)
with Buffer On
DATA
RATE
(SPS)
PGA
1
2
4
8
16
32
64
2.5
5
10
15
25
30
50
60
100
500
1000
2000
3750
7500
15,000
30,000
25.3
25.0
24.8
24.6
24.3
24.2
23.9
23.8
23.4
22.3
21.7
21.2
20.8
20.4
20.1
19.8
24.9
24.8
24.5
24.2
24.0
23.8
23.6
23.4
23.0
21.9
21.3
20.9
20.5
20.1
19.7
19.5
24.9
24.5
24.1
23.8
23.4
23.3
23.0
22.9
22.5
21.5
20.8
20.4
20.0
19.6
19.3
19.1
24.4
24.0
23.5
23.2
23.0
22.8
22.5
22.4
22.0
20.9
20.2
19.7
19.4
19.0
18.7
18.5
23.8
23.3
22.9
22.5
22.2
22.1
21.8
21.7
21.4
20.3
19.8
19.3
19.0
18.5
18.2
18.0
23.0
22.7
22.3
21.8
21.5
21.5
21.1
21.0
20.8
19.6
19.2
18.8
18.4
17.9
17.7
17.4
22.2
21.8
21.3
21.0
20.7
20.5
20.3
20.2
19.8
18.7
18.3
17.9
17.4
17.0
16.7
16.5
Table 3. Noise-Free Resolution (bits)
with Buffer On
DATA
RATE
(SPS)
PGA
1
2
4
8
16
32
64
2.5
5
10
15
25
30
50
60
100
500
1000
2000
3750
7500
15,000
30,000
23.0
22.3
22.3
22.0
21.7
21.8
21.3
21.3
20.9
20.1
19.0
18.5
18.1
17.7
17.3
17.1
22.6
22.4
22.0
21.7
21.4
21.3
21.1
20.9
20.7
19.6
18.6
18.1
17.8
17.3
17.0
16.7
22.1
21.9
21.6
21.3
21.1
20.8
20.4
20.5
20.2
19.1
18.1
17.8
17.3
16.9
16.5
16.4
21.7
21.3
21.0
20.7
20.5
20.4
19.9
19.8
19.6
18.6
17.5
17.0
16.6
16.2
15.9
15.9
21.3
20.7
20.4
20.1
19.7
19.8
19.4
19.3
19.1
18.0
17.2
16.6
16.2
15.8
15.5
15.4
20.8
20.3
19.9
19.3
19.2
19.0
18.8
18.8
18.5
17.3
16.5
16.1
15.7
15.3
14.9
14.6
19.7
19.3
18.9
18.7
18.5
18.1
17.9
17.8
17.4
16.3
15.6
15.3
14.7
14.4
13.9
13.8
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ADS1256IDBR Very Low Noise, 24-Bit Analog-to-Digital Converter
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ADS1256IDBR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24Bit 30kSPS Very Lo-Noise Delta-Sigma RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構: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
ADS1256IDBRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24Bit 30kSPS Very Lo-Noise Delta-Sigma RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構: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
ADS1256IDBT 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 24Bit 30kSPS Very Lo-Noise Delta-Sigma RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構: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
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