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ADS1131 Datasheet(PDF) 6 Page - Texas Instruments |
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ADS1131 Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 21 page  R INT R INT R F1 R 1 R F2 ADC A3 Gain=1 CAP AINP CAP A2 A1 450W 18pF AINN 450W 18pF ADS1131 SBAS449C – JULY 2009 – REVISED OCTOBER 2013 www.ti.com OVERVIEW –39mV to +39mV, and the unipolar input ranges from The ADS1131 is a precision, 18-bit ADC that includes 0mV to +39mV. The inputs of the ADS1131 are a low-noise PGA, internal oscillator, third-order delta- protected with internal diodes connected to the sigma ( ΔΣ) modulator, and fourth-order digital filter. power-supply rails. These diodes clamp the applied The ADS1131 provides a complete front-end solution signal to prevent it from damaging the input circuitry. for bridge sensor applications such as weigh scales, strain gauges, and pressure sensors. Data can be output at 10SPS for excellent 50Hz and 60Hz rejection, or at 80SPS when higher speeds are needed. The ADS1131 is easy to configure, and all digital control is accomplished through dedicated pins; there are no registers to program. A simple two- wire serial interface retrieves the data. ANALOG INPUTS (AINP, AINN) The input signal to be measured is applied to the input pins AINP and AINN. The ADS1131 accepts differential input signals, but can also measure unipolar signals. When measuring unipolar (or single- ended signals) with respect to ground, connect the negative input (AINN) to ground and connect the input signal to the positive input (AINP). Note that when the ADS1131 is configured this way, only half of the converter full-scale range is used, because Figure 1. Simplified Diagram of the Amplifier only positive digital output codes are produced. External Capacitor LOW-NOISE AMPLIFIER An external capacitor (CEXT) across the ADS1131 two The ADS1131 features a low-drift, low-noise amplifier CAP pins combines with the internal resistor RINT (on- that provides a complete front-end solution for bridge chip) to create a low-pass filter. The recommended sensors. A simplified diagram of the amplifier is value for CEXT is 0.1μF which provides a corner shown in Figure 1. It consists of two chopper- frequency of 720Hz. This low-pass filter serves two stabilized amplifiers (A1 and A2) and three accurately purposes. First, the input signal is bandlimited to matched resistors (R1, RF1, and RF2) that construct a prevent aliasing by the ADC and to filter out the high- differential front-end stage with a gain of 64, followed frequency noise. Second, it attenuates the chopping by gain stage A3 (Gain = 1). The inputs are equipped residue from the amplifier to improve temperature drift with an EMI filter, as shown in Figure 1. The cutoff performance. NPO or C0G capacitors are frequency of the EMI filter is 20MHz. By using AVDD recommended. For optimal performance, place the as the reference input, the bipolar input ranges from external capacitor very close to the CAP pins. 6 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: ADS1131 |
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