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ADS1294CZXGR Datasheet(PDF) 7 Page - Texas Instruments |
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ADS1294CZXGR Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 80 page  ADS1294 , ADS1296 ADS1298 www.ti.com SBAS459E – JANUARY 2010 – REVISED AUGUST 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 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 (mVRMS/mVPP) 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. Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): ADS1294 ADS1296 ADS1298 |
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