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ADS1230IPWG4 Datasheet(PDF) 10 Page - Texas Instruments |
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ADS1230IPWG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 30 page R INT R INT R F1 R 1 R F2 ADC A3 Gain=1or2 CAP AINP CAP A2 A1 450W 18pF AINN 450W 18pF ADS1230 SBAS366B – OCTOBER 2006 – REVISED SEPTEMBER 2012 www.ti.com OVERVIEW input ranges from 0mV to +39mV (Gain = 64) or 0mV to +19.5mV (Gain = 128). The inputs of the ADS1230 The ADS1230 is a precision, 20-bit ADC that includes are protected with internal diodes connected to the a low-noise PGA, internal oscillator, third-order delta- power-supply rails. These diodes clamp the applied sigma ( ΔΣ) modulator, and fourth-order digital filter. signal to prevent it from damaging the input circuitry. The ADS1230 provides a complete front-end solution for bridge sensor applications such as weigh scales, strain guages, and pressure sensors. Clocking can be supplied by an external clock or by a precision internal oscillator. Data can be output at 10SPS for excellent 50Hz and 60Hz rejection, or at 80SPS when higher speeds are needed. The ADS1230 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 ADS1230 accepts differential input signals, but can also measure unipolar signals. When measuring unipolar (or single- ended signals) with respect to ground, connect the Figure 18. Simplified Diagram of the PGA negative input (AINN) to ground and connect the input signal to the positive input (AINP). Note that when the ADS1230 is configured this way, only half Bypass Capacitor of the converter full-scale range is used, since only positive digital output codes are produced. By applying a 0.1 μF external capacitor (CEXT) across two capacitor pins combined with the internal 2k Ω resistor RINT (on-chip), a low-pass filter with a corner LOW-NOISE PGA frequency of 720Hz is created to bandlimit the signal The ADS1230 features a low-drift, low-noise PGA path before the modulator input. This low-pass filter that provides a complete front-end solution for bridge serves two purposes. First, the input signal is sensors. A simplified diagram of the PGA is shown in bandlimited to prevent aliasing as well as to filter out Figure 18. It consists of two chopper-stabilized the high-frequency noise. Second, it attenuates the amplifiers (A1 and A2) and three accurately-matched chopping residue from the amplifier to improve resistors (R1, RF1, and RF2), which construct a temperature drift performance. It is not required to differential front-end stage with a gain of 64, followed use high-quality capacitors (such as ceramic or by gain stage A3 (Gain = 1 or 2). The PGA inputs are tantalum capacitors) for a general application. equipped with an EMI filter, as shown in Figure 18. However, high-quality capacitors such as poly are The cutoff frequency of the EMI filter is 19.6MHz. By recommended for high-linearity applications. using AVDD as the reference input, the bipolar input ranges from –39mV to +39mV (Gain = 64) or –19.5mV to +19.5mV (Gain = 128), and the unipolar 10 Submit Documentation Feedback Copyright © 2006–2012, Texas Instruments Incorporated Product Folder Links: ADS1230 |
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