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| 型号： | PADS1298CZXGT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBGA64 |
| 封装： | 8 X 8 MM, LEAD FREE, PLASTIC, NFBGA-64 |
| 文件页数： | 67/73页 |
| 文件大小： | 957K |
| 代理商： | PADS1298CZXGT |
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PRODUCTPREVIEW
www.ti.com
SBAS459C – JANUARY 2010 – REVISED MARCH 2010
NOISE MEASUREMENTS
The ADS1294/6/8 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 ADS1294/6/8 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 ADS1294/6/8 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
ADS1294/6/8 noise performance when using a low-noise external reference such as the REF5025.
Table 1. Input-Referred Noise (mVRMS/mVPP) in High-Resolution Mode
3V Analog Supply and 2.4V Reference(1)
DR BITS OF
OUTPUT
–3dB
CONFIG1
DATA RATE
BANDWIDTH
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 (mVRMS/mVPP) in Low-Power Mode
3V Analog Supply and 2.4V Reference(1)
DR BITS OF
OUTPUT
–3dB
CONFIG1
DATA RATE
BANDWIDTH
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.
Copyright 2010, Texas Instruments Incorporated
7
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相关代理商/技术参数 |
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