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ADS1209 Datasheet(PDF) 11 Page - Texas Instruments |
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ADS1209 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 24 page  27W 5kW 5kW 2kW 2kW +5V 0.1nF +3V +3V 0.1 F m 0.1 F m 0.1 F m ± 5V OPA2350 0.1 F m 27W 5kW 5kW 2kW 2kW +5V 0.1nF ± 5V OPA2350 0.1 F m 2nd-Order DS Modulator FPGA or ASIC CHA+ AVDD CHA- Output Interface Circuit RC Oscillator 20MHz Out EN Clock Select Divider REFINA Reference Voltage 2.5V REFOUT OUTA OUTB CLKIN AGND AGND AGND AGND BVDD CLKOUT BVDD BGND +5V 0.1 F m +5V 0.1 F m +5V 0.1 F m +5V 0.1 F m CLKSEL AVDD AVDD AVDD AVDD 2nd-Order DS Modulator CHB+ CHB- REFINB +5V OPA336 ADS1209 www.ti.com SBAS491 – FEBRUARY 2010 GENERAL DESCRIPTION The ADS1209 is a two-channel, second-order, CMOS An application-specific integrated circuit (ASIC) or device with two delta-sigma ( ΔΣ) modulators, field-programmable gate array (FPGA) can be used designed for medium- to high-resolution A/D signal to implement the digital filter. Alternatively, TI's conversions from dc to 40kHz (filter response –3dB) if AMC1210 offers four programmable digital filters that an oversampling ratio (OSR) of 64 is chosen. The can be used. Figure 20 and Figure 21 show typical output of the converter (OUTx) provides a stream of application circuits with the ADS1209 connected to an digital ones and zeros. The time average of this serial FPGA or ASIC. output is proportional to the analog input voltage. The overall performance (that is, speed and The modulator shifts the quantization noise to high accuracy) depends on the selection of an appropriate frequencies. A low-pass digital filter should be used OSR and filter type. A higher OSR produces greater at the output of the ΔΣ modulator. The filter serves output accuracy while operating at a lower data rate. two functions. First, it filters out high-frequency noise. Alternatively, a lower OSR produces lower output Second, the filter converts the 1-bit data stream at a accuracy, but operates at a higher data rate. This high sampling rate into a higher-bit data word at a system allows flexibility with the digital filter design lower rate (decimation). and is capable of A/D conversion results that have a dynamic range exceeding 86dB with an OSR = 256. Figure 20. Single-Ended Connection Diagram for the ADS1209 ΔΣ Modulator Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): ADS1209 |
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