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ADS1298IPAG Datasheet(PDF) 77 Page - Texas Instruments |
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ADS1298IPAG Datasheet(HTML) 77 Page - Texas Instruments |
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77 / 88 page  ADS1298 0.1 F m 1 F m AVDD AVDD1 0.1 F m 1 F m -1.5V AVSS AVSS1 DGND DVDD +1.5V +1.8V 0.1 F m 1 F m VCAP1 VCAP2 VCAP3 0.1 F m VREFP VREFN 10 F m VCAP4 WCT 1 F m 1 F m 1nF 1 F m -1.5V 22 F m 0.1 F m RESV1 5kW 10pF AVSS AVDD INxP, INxN ADS1294, ADS1294R ADS1296, ADS1296R ADS1298, ADS1298R www.ti.com SBAS459H – JANUARY 2010 – REVISED OCTOBER 2011 Connecting the Device to Bipolar ( ±1.5V/1.8V) Supplies Figure 74 illustrates the ADS129x connected to a bipolar supply. In this example, the analog supplies connect to the device analog supply (AVDD). This supply is referenced to the device analog return (AVSS), and the digital supply (DVDD) is referenced to the device digital ground return (DGND). NOTE: Place the capacitors for supply, reference, WCT, and VCAP1 to VCAP4 as close to the package as possible. Figure 74. Bipolar Supply Operation Shielding Analog Signal Paths As with any precision circuit, careful PCB layout ensures the best performance. It is essential to make short, direct interconnections and avoid stray wiring capacitance —particularly at the analog input pins and AVSS. These analog input pins are high-impedance and extremely sensitive to extraneous noise. The AVSS pin should be treated as a sensitive analog signal and connected directly to the supply ground with proper shielding. Leakage currents between the PCB traces can exceed the input bias current of the ADS129x if shielding is not implemented. Digital signals should be kept as far as possible from the analog input signals on the PCB. Analog Input Structure The analog input of the ADS129x is as shown in Figure 75. Figure 75. Analog Input Protection Circuit Copyright © 2010–2011, Texas Instruments Incorporated Submit Documentation Feedback 77 Product Folder Link(s): ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R |
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