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ADS1201 Datasheet(PDF) 5 Page - Burr-Brown (TI) |
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ADS1201 Datasheet(HTML) 5 Page - Burr-Brown (TI) |
5 / 13 page 5 ® ADS1201 FIGURE 1. Connection Diagram for the ADS1201 Delta-Sigma Modulator Including External Processor. 110 105 100 95 90 85 80 CMRR vs V DIN V DIN (V) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C, AVDD = DVDD = +5V, MCLK = 320kHz, REFEN LOW, BIASEN LOW, and external +2.5V reference, unless otherwise specified. ADS1201 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 AV DD REF OUT REF IN NIC A INP A INN AGND V BIAS REF EN MOUT MCLK DV DD DGND CAL GAIN/OFFSET BIAS EN Processor 200 Ω Analog Supply 10 µF 0.1 µF Digital Supply 200 Ω 0.1 µF 47pF 47pF GENERAL DESCRIPTION The ADS1201 is a single channel, second-order, CMOS analog modulator designed for high resolution conversions from dc to 1000Hz. The output of the converter (MOUT) provides a stream of digital ones and zeros. The time average of this serial output is proportional to the analog input voltage. The combination of an ADS1201 and a processor that is programmed to implement a digital filter results in a high resolution A/D converter system. This system allows flexibility with the digital filter design and is capable of A/D conversion results that have a dynamic range that exceeds 130dB (see Figure 1). THEORY OF OPERATION The differential analog input of the ADS1201 is imple- mented with a switched capacitor circuit. This switched capacitor circuit implements a 2nd-order modulator stage which digitizes the input signal into a binary output stream. The input stage of the converter can be configured to sample an analog signal or to perform a calibration which quantifies offset and gain errors. The sample clock (MCLK) provides the switched capacitor network and modulator clock signal for the A/D conversion process, as well as the output data framing clock. Different frequencies for this clock allows for a variety of performance solutions in resolution and signal bandwidth. The analog input signal is continuously sampled by the A/D converter and compared to an internal or external voltage reference. A digital stream appears at the output of the converter. This digital stream accurately repre- sents the analog input voltage over time. |
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