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TLA2021IRUGT Datenblatt(PDF) 11 Page - Texas Instruments |
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TLA2021IRUGT Datenblatt(HTML) 11 Page - Texas Instruments |
11 / 33 page 11 TLA2021, TLA2022, TLA2024 www.ti.com SBAS846 – NOVEMBER 2017 Product Folder Links: TLA2021 TLA2022 TLA2024 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Feature Description (continued) (1) This parameter expresses the full-scale range of the ADC scaling. Do not apply more than VDD + 0.3 V to this device. 8.3.3 Full-Scale Range (FSR) and LSB Size A programmable gain amplifier (PGA) is implemented before the ΔΣ ADC of the TLA2022 and TLA2024. The full- scale range is configured by bits PGA[2:0] in the configuration register and can be set to ±6.144 V, ±4.096 V, ±2.048 V, ±1.024 V, ±0.512 V, or ±0.256 V. Table 1 shows the FSR together with the corresponding LSB size. Equation 2 shows how to calculate the LSB size from the selected full-scale range. LSB = FSR / 2 12 (2) Table 1. Full-Scale Range and Corresponding LSB Size FSR LSB SIZE ±6.144 V(1) 3 mV ±4.096 V(1) 2 mV ±2.048 V 1 mV ±1.024 V 0.5 mV ±0.512 V 0.25 mV ±0.256 V 0.125 mV The FSR of the TLA2021 is fixed at ±2.048 V. Analog input voltages must never exceed the analog input voltage limits given in the Absolute Maximum Ratings table. If a VDD supply voltage greater than 4 V is used, the ±6.144-V full-scale range allows input voltages to extend up to the supply. Although in this case (or whenever the supply voltage is less than the full-scale range) a full-scale ADC output code cannot be obtained. For example, with VDD = 3.3 V and FSR = ±4.096 V, only signals up to VIN = ±3.3 V can be measured. The code range that represents voltages |VIN| > 3.3 V is not used in this case. 8.3.4 Voltage Reference The TLA202x have an integrated voltage reference. An external reference cannot be used with these devices. Errors associated with the initial voltage reference accuracy and the reference drift with temperature are included in the gain error and gain drift specifications in the Electrical Characteristics table. 8.3.5 Oscillator The TLA202x have an integrated oscillator running at 1 MHz. No external clock can be applied to operate these devices. The internal oscillator drifts over temperature and time. The output data rate scales proportionally with the oscillator frequency. 8.3.6 Output Data Rate and Conversion Time The TLA202x offer programmable output data rates. Use the DR[2:0] bits in the configuration register to select output data rates of 128 SPS, 250 SPS, 490 SPS, 920 SPS, 1600 SPS, 2400 SPS, or 3300 SPS. Conversions in the TLA202x settle within a single cycle, which means the conversion time equals 1 / DR. |
Ähnliche Teilenummer - TLA2021IRUGT |
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Ähnliche Beschreibung - TLA2021IRUGT |
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