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ADS1298RIZXGR Arkusz danych(PDF) 8 Page - Texas Instruments

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Numer części ADS1298RIZXGR
Szczegółowy opis  Low-Power, 8-Channel, 24-Bit Analog Front-End for Biopotential Measurements
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Strona internetowa  http://www.ti.com
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ADS1294, ADS1294R
ADS1296, ADS1296R
ADS1298, ADS1298R
SBAS459I
– JANUARY 2010 – REVISED JANUARY 2012
www.ti.com
NOISE MEASUREMENTS
NOTE
The ADS1294R/6R/8R channel performance differs from the ADS1294/6/8 in regards to
respiration circuitry found on channel one. Unless otherwise noted, ADS129x refers to all
specifications and functional descriptions of the ADS1294, ADS1296, ADS1298,
ADS1294R, ADS1296R, and ADS1298R.
The ADS129x noise performance can be optimized by adjusting the data rate and PGA setting. As the averaging
is increased by reducing the data rate, the noise drops correspondingly. Increasing the PGA value reduces the
input-referred noise, which is particularly useful when measuring low-level biopotential signals. Table 1 and
Table 2 summarize the noise performance of the ADS129x in the High-Resolution (HR) mode and Low-Power
(LP) mode, respectively, with a 3V analog power supply. Table 3 and Table 4 summarize the noise performance
of the ADS129x in the HR mode and LP mode, respectively, with a 5V analog power supply. The data are
representative of typical noise performance at TA = +25°C. The data shown are the result of averaging the
readings from multiple devices and are measured with the inputs shorted together. A minimum of 1000
consecutive readings are used to calculate the RMS and peak-to-peak noise for each reading. For the two
highest data rates, the noise is limited by quantization noise of the ADC and does not have a gaussian
distribution. Thus, the ratio between rms noise and peak-to-peak noise is approximately 10. For the lower data
rates, the ratio is approximately 6.6.
Table 1 to Table 4 show measurements taken with an internal reference. The data are also representative of the
ADS129x noise performance when using a low-noise external reference such as the REF5025.
Table 1. Input-Referred Noise (
μVRMS/μVPP) in High-Resolution Mode
3V Analog Supply and 2.4V Reference(1)
DR BITS OF
OUTPUT
–3dB
CONFIG1
DATA RATE
BANDWIDTH
PGA
PGA
PGA
PGA
PGA
PGA
PGA
REGISTER
(SPS)
(Hz)
GAIN = 1
GAIN = 2
GAIN = 3
GAIN = 4
GAIN = 6
GAIN = 8
GAIN = 12
000
32000
8398
335/3553
168/1701
112/1100
85/823
58/529
42.5/378
28.6/248
001
16000
4193
56/613
28/295
18.8/188
14.3/143
9.7/94
7.4/69
5.2/44.3
010
8000
2096
12.4/111
6.5/54
4.5/37.9
3.5/29.7
2.6/21.7
2.2/17.8
1.8/13.8
011
4000
1048
6.1/44.8
3.2/23.3
2.4/17.1
1.9/14.0
1.5/11.1
1.3/9.7
1.2/8.5
100
2000
524
4.1/27.8
2.2/15.4
1.6/11.0
1.3/9.1
1.1/7.3
1.0/6.5
0.9/6.0
101
1000
262
2.9/19.0
1.6/10.1
1.2/7.5
1.0/6.2
0.8/5.0
0.7/4.6
0.6/4.1
110
500
131
2.1/12.5
1.1/6.8
0.9/5.1
0.7/4.3
0.6/3.5
0.5/3.1
0.5/2.9
(1)
At least 1000 consecutive readings were used to calculate the RMS and peak-to-peak noise values in this table.
Table 2. Input-Referred Noise (
μVRMS/μVPP) in Low-Power Mode
3V Analog Supply and 2.4V Reference(1)
DR BITS OF
OUTPUT
–3dB
CONFIG1
DATA RATE
BANDWIDTH
PGA
PGA
PGA
PGA
PGA
PGA
PGA
REGISTER
(SPS)
(Hz)
GAIN = 1
GAIN = 2
GAIN = 3
GAIN = 4
GAIN = 6
GAIN = 8
GAIN = 12
000
16000
4193
333/3481
166/1836
111/1168
84/834
56/576
42/450
28/284
001
8000
2096
56/554
28/272
19/177
14.3/133
9.7/85
7.4/64
5.0/42.4
010
4000
1048
12.5/99
6.5/51
4.5/35.0
3.4/25.9
2.4/18.8
2.0/14.5
1.5/11.3
011
2000
524
6.1/41.8
3.2/22.2
2.3/15.9
1.8/12.1
1.4/9.3
1.2/7.8
1.0/6.7
100
1000
262
4.1/26.3
2.2/14.6
1.6/9.9
1.3/8.1
1.0/6.2
0.8/5.4
0.7/4.7
101
500
131
3.0/17.9
1.6/9.8
1.1/6.8
0.9/5.7
0.7/4.2
0.6/3.6
0.5/3.4
110
250
65
2.1/11.9
1.1/6.3
0.8/4.6
0.7/4.0
0.5/3.0
0.5/2.6
0.4/2.4
(1)
At least 1000 consecutive readings were used to calculate the RMS and peak-to-peak noise values in this table.
8
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