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ADS1211E Datasheet(PDF) 10 Page - Texas Instruments |
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ADS1211E Datasheet(HTML) 10 Page - Texas Instruments |
10 / 51 page ADS1210, ADS1211 10 SBAS034B www.ti.com DATA -3DB RATE FREQUENCY (HZ) (HZ) G = 1 G = 2 G = 4 G = 8 G = 16 10 2.62 21.5 21.0 21.0 21.0 20.0 25 6.55 20.5 20.5 20.5 20.0 19.5 30 7.86 20.5 20.5 20.5 20.0 19.5 50 13.1 20.0 20.0 20.0 19.5 19.0 60 15.7 19.5 19.5 19.5 19.0 19.0 100 26.2 18.0 18.0 18.0 18.0 18.0 250 65.5 15.0 15.0 15.0 15.0 15.0 500 131 12.5 12.5 12.5 12.5 12.5 1000 262 10.0 10.5 10.0 10.0 10.0 EFFECTIVE RESOLUTION (BITS RMS) TABLE III. Effective Resolution vs Data Rate and Gain Setting. (Turbo Mode Rate of 1 and a 10MHz clock.) DEFINITION OF TERMS An attempt has been made to be consistent with the termi- nology used in this data sheet. In that regard, the definition of each term is given as follows: Analog Input Differential Voltage—For an analog signal that is fully differential, the voltage range can be compared to that of an instrumentation amplifier. For example, if both analog inputs of the ADS1210 are at 2.5V, then the differ- ential voltage is 0V. If one is at 0V and the other at 5V, then the differential voltage magnitude is 5V. But, this is the case regardless of which input is at 0V and which is at 5V, while the digital output result is quite different. The analog input differential voltage is given by the follow- ing equation: AINP – AINN. Thus, a positive digital output is produced whenever the analog input differential voltage is positive, while a negative digital output is produced when- ever the differential is negative. For example, when the converter is configured with a 2.5V reference and placed in a gain setting of 2, the positive full- scale output is produced when the analog input differential is 2.5V. The negative full-scale output is produced when the differential is –2.5V. In each case, the actual input voltages must remain within the AGND to AVDD range (see Table I). Actual Analog Input Voltage—The voltage at any one analog input relative to AGND. Full-Scale Range (FSR)—As with most A/D converters, the full-scale range of the ADS1210/11 is defined as the “input” which produces the positive full-scale digital output minus the “input” which produces the negative full-scale digital output. For example, when the converter is configured with a 2.5V reference and is placed in a gain setting of 2, the full-scale range is: [2.5V (positive full scale) minus –2.5V (negative full scale)] = 5V. Typical Analog Input Voltage Range—This term de- scribes the actual voltage range of the analog inputs which will cover the converter’s full-scale range, assuming that each input has a common-mode voltage that is greater than REFIN/PGA and smaller than (AVDD – REFIN/PGA). LSB Weight = Full −Scale Range 2N For example, when the converter is configured with a 2.5V reference and placed in a gain setting of 2, the typical input voltage range is 1.25V to 3.75V. However, an input range of 0V to 2.5V or 2.5V to 5V would also cover the converter’s full-scale range. Voltage Span—This is simply the magnitude of the typical analog input voltage range. For example, when the converter is configured with a 2.5V reference and placed in a gain setting of 2, the input voltage span is 2.5V. Least Significant Bit (LSB) Weight—This is the theoreti- cal amount of voltage that the differential voltage at the analog input would have to change in order to observe a change in the output data of one least significant bit. It is computed as follows: where N is the number of bits in the digital output. Effective Resolution—The effective resolution of the ADS1210/11 in a particular configuration can be expressed in two different units: bits rms (referenced to output) and microvolts rms (referenced to input). Computed directly from the converter’s output data, each is a statistical calcu- lation based on a given number of results. Knowing one, the other can be computed as follows: The 10V figure in each calculation represents the full-scale range of the ADS1210/11 in a gain setting of 1. This means that both units are absolute expressions of resolution—the performance in different configurations can be directly com- pared regardless of the units. Comparing the resolution of different gain settings expressed in bits rms requires ac- counting for the PGA setting. Main Controller—A generic term for the external microcontroller, microprocessor, or digital signal processor which is controlling the operation of the ADS1210/11 and receiving the output data. ER in bits rms = 20 • log 10V PGA ER in Vrms −1.76 6.02 ER in Vrms = 10 10V PGA 6.02 • ER in bits rms +1.76 20 |
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