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ADS1131IDR Datasheet(PDF) 6 Page - Texas Instruments |
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ADS1131IDR Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 20 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 SBAS449B – JULY 2009 – REVISED SEPTEMBER 2011 www.ti.com OVERVIEW ranges from 0mV to +39mV. The inputs of the The ADS1131 is a precision, 18-bit ADC that includes ADS1131 are protected with internal diodes a low-noise PGA, internal oscillator, third-order connected to the power-supply rails. These diodes delta-sigma ( ΔΣ) modulator, and fourth-order digital clamp the applied signal to prevent it from damaging filter. The ADS1131 provides a complete front-end the input circuitry. solution 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 that provides a complete front-end solution for bridge (on-chip) to create a low-pass filter. The sensors. A simplified diagram of the amplifier is recommended value for CEXT is 0.1μF which provides shown in Figure 1. It consists of two a corner frequency of 720Hz. This low-pass filter chopper-stabilized amplifiers (A1 and A2) and three serves two purposes. First, the input signal is accurately matched resistors (R1, RF1, and RF2) that bandlimited to prevent aliasing by the ADC and to construct a differential front-end stage with a gain of filter out the high-frequency noise. Second, it 64, followed by gain stage A3 (Gain = 1). The inputs attenuates the chopping residue from the amplifier to are equipped with an EMI filter, as shown in Figure 1. improve temperature drift performance. NPO or C0G The cutoff frequency of the EMI filter is 20MHz. By capacitors are recommended. For optimal using AVDD as the reference input, the bipolar input performance, place the external capacitor very close ranges from –39mV to +39mV, and the unipolar input to the CAP pins. 6 Submit Documentation Feedback Copyright © 2009–2011, Texas Instruments Incorporated |
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