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ADS1222IPWT Datasheet(PDF) 8 Page - Texas Instruments |
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ADS1222IPWT Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 27 page  ADS1222 SBAS314B − APRIL 2004 − REVISED JANUARY 2009 www.ti.com 8 OVERVIEW The ADS1222 is an A/D converter comprised of a delta-sigma modulator followed by a digital filter. A mux allows for one of two input channels to be selected. A buffer can also be selected to increase the input impedance. The modulator measures the differential input signal VIN = (AINP – AINN) against the differential reference VREF = (VREFP – VREFN). Figure 13 shows a conceptual diagram of the device. The differential reference is scaled internally so that the full-scale input range is ±2VREF. The digital filter receives the modulator signal and provides a low-noise digital output. A 2-wire serial interface indicates conversion completion and provides the user with the output data. ANALOG INPUTS (AINPx, AINNx) The input signal to be measured is applied to the input pins AINPx and AINNx. The positive internal input is generalized as AINP, and the negative internal input is generalized as AINN. The signal is selected though the input mux, which is controlled by MUX, as shown in Table 1. The ADS1222 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 (AINNx) to ground and connect the input signal to the positive input (AINPx). Note that when the ADS1222 is configured this way, only half of the converter full-scale range is used since only positive digital output codes are produced. An input buffer can be selected to increase the input impedance of the A/D converter with the BUFEN pin. Table 1. Input Channel Selection with MUX DIGITAL PIN SELECTED ANALOG INPUTS MUX POSITIVE INPUT NEGATIVE INPUT 0 AINP1 AINN1 1 AINP2 AINN2 Mux AINP V IN AINN Temp Sensor Digital Filter and Serial Interface ∆Σ Modulator VREFP Σ VREFN Buffer AINP1 AINN1 AINP2 AINN2 + − CLK DRDY/DOUT SCLK TEMPEN MUX BUFEN 2 V REF 2V REF Σ Figure 13. Conceptual Diagram of the ADS1222 |
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