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ADS1198CPAGR Arkusz danych(PDF) 7 Page - Texas Instruments |
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ADS1198CPAGR Arkusz danych(HTML) 7 Page - Texas Instruments |
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7 / 73 page  ADS1194 ADS1196 ADS1198 www.ti.com SBAS471A – APRIL 2010 – REVISED SEPTEMBER 2010 NOISE MEASUREMENTS The ADS1194/6/8 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 summarizes the noise performance of the ADS1194/6/8, with a 3V analog power supply. Table 2 summarizes the noise performance of the ADS1194/6/8 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 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. The ratio between rms noise and peak-to-peak noise for these two data rates are approximately 10. For the lower data rates, the ratio is approximately 6.6. Table 1 and Table 2 show measurements taken with an internal reference. In many of the settlings, espeically at the lower data rates, the inherent device noise is less than 1LSB. For these cases, the noise is rounded up to 1LSB. The data are also representative of the ADS1194/6/8 noise performance when using a low-noise external reference such as the REF5025. Table 1. Input-Referred Noise (mVPP) 3V Analog Supply and 2.4V Reference(1)(2) 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 8000 4193 2930 1470 937 681 436 319 205 001 4000 2096 563 265 173 124 77 56 36 010 2000 1048 104 51 33 24 17 13 9.5 011 1000 524 73.3 36.6 24.4 18.3 12.2 9.2 6.1 100 500 262 73.3 36.6 24.4 18.3 12.2 9.2 6.1 101 250 131 73.3 36.6 24.4 18.3 12.2 9.2 6.1 110 125 65 73.3 36.6 24.4 18.3 12.2 9.2 6.1 (1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table. (2) For data rates less than 2kSPS, the noise is rounded up to 1LSB. Input-referred LSB in volts = (2 × VREF/(Gain × 2 16)). Table 2. Input-Referred Noise (mVPP) 5V Analog Supply and 4V Reference(1)(2) 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 8000 4193 4923 2450 1598 1196 765 560 362 001 4000 2096 959 481 307 222 142 100 63 010 2000 1048 166 81 52 40 26 19 12.3 011 1000 524 122.1 61.1 40.7 30.5 20.4 15.3 10.2 100 500 262 122.1 61.1 40.7 30.5 20.4 15.3 10.2 101 250 131 122.1 61.1 40.7 30.5 20.4 15.3 10.2 110 125 65 122.1 61.1 40.7 30.5 20.4 15.3 10.2 (1) At least 1000 consecutive readings were used to calculate the peak-to-peak noise values in this table. (2) For data rates less than 2kSPS, the noise is rounded up to 1LSB. Input-referred LSB in volts = (2 × VREF/(Gain × 2 16)). Table 3. Typical WCT Performance ANY ONE ANY TWO ALL THREE PARAMETER (A, B, or C) (A+B, A+C, or B+C) (A+B+C) UNIT Noise 563 404 330 nVRMS Power 36 40 44 mA –3dB BW 30 59 89 kHz Slew rate BW limited BW limited BW limited — Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): ADS1194 ADS1196 ADS1198 |
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