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ADS1226IRGVR Datasheet(PDF) 10 Page - Texas Instruments |
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ADS1226IRGVR Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 30 page  OVERVIEW ANALOG INPUTS (AINx+, AINx–) MUX SerialInterface Oscillator DS ADC VREFP VREFN Buffer MUX ADS1226Only AINP1 AINN1 AINP AINN AINP2 AINN2 DRDY/DOUT SCLK TEMPEN START MODE BUFEN V IN S S V REF ADS1225 ADS1226 SBAS346C – MAY 2006 – REVISED JANUARY 2009 ....................................................................................................................................................... www.ti.com The ADS1225 and ADS1226 are 24-bit delta-sigma The input signal to be measured is applied to the A/D converters. Figure 19 shows a conceptual input pins AINPx and AINNx. The positive internal diagram of the device. The ADS1225 has a single input is generalized as AINP, and the negative channel, while the ADS1226 allows for one of two internal input is generalized as AINN. The signal is input channels to be selected through a multiplexer. A selected though the input MUX, which is controlled by buffer can also be selected to increase the input MUX, as shown in Table 1. The ADS1225 and impedance. The modulator measures the differential ADS1226 accept differential input signals, but can input signal VIN = (AINP – AINN) against the also measure unipolar signals. When measuring differential reference VREF = (VREFP – VREFN). The unipolar (or single-ended) signals with respect to full-scale input range is ±VREF. A 2-wire serial ground, connect the negative input (AINN) to ground interface indicates conversion completion and and connect the input signal to the positive input provides the user with the output data. An internal (AINP). Note that when the ADS1225 and ADS1226 oscillator allows for free-running of the ADS1225 and are configured this way, only half of the converter ADS1226. full-scale range is used since only positive digital output codes are produced. An input buffer can be Two other pins are used to control the operation of selected to increase the input impedance of the A/D the ADS1225 and ADS1226. The START pin initiates converter with the BUFEN pin. conversions. The MODE pin puts the device into one of two modes. In High-Speed mode, the device gives Table 1. Input Channel Selection with MUX data at 100 samples per second (SPS). In DIGITAL PIN SELECTED ANALOG INPUTS High-Resolution mode, data comes out at 16SPS with lower noise. In both modes, the device has MUX POSITIVE INPUT NEGATIVE INPUT single-cycle settling, reducing the latency of the 0 AINP1 AINN1 output data. 1 AINP2 AINN2 Figure 19. Conceptual Diagram of the ADS1225 and ADS1226 10 Submit Documentation Feedback Copyright © 2006–2009, Texas Instruments Incorporated Product Folder Link(s): ADS1225 ADS1226 |
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Similar Description - ADS1226IRGVR |
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