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LT6660 Datasheet(PDF) 11 Page - Linear Technology |
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LT6660 Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page LTC2453 11 2453f first to the decoupling capacitors described above, the second to the ground return for the input signal source, and the third to the ground return for the power supply voltage source. Driving REF+ and REF– A simplified equivalent circuit for REF+ and REF– is shown in Figure 8. Like all other A/D converters, the LTC2453 is only as accurate as the reference it is using. Therefore, it is important to keep the reference line quiet by careful low and high frequency power supply decoupling. The LT6660 reference is an ideal match for driving the LTC2453’s REF+ pin. The LTC6660 is available in a 2mm × 2mm DFN package with 2.5V, 3V, 3.3V and 5V options. A 0.1μF, high quality, ceramic capacitor in parallel with a 10μF ceramic capacitor should be connected between the REF+/REF– and GND pins, as close as possible to the RSW 15k (TYP) ILEAK ILEAK VCC VCC VCC VCC CEQ 0.35pF (TYP) IN+ IN– REF– REF+ 2453 F08 RSW 15k (TYP) ILEAK ILEAK RSW 15k (TYP) ILEAK ILEAK RSW 15k (TYP) ILEAK ILEAK Figure 8. LTC2453 Analog Input/Reference Equivalent Circuit ILEAK ILEAK RSW 15k (TYP) ICONV CIN IN+ VCC SIG+ SIG– RS CEQ 0.35pF (TYP) CPAR + – 2453 F09 ILEAK ILEAK RSW 15k (TYP) ICONV CIN IN– VCC RS CEQ 0.35pF (TYP) CPAR + – Figure 9. LTC2453 Input Drive Equivalent Circuit package. The 0.1μF capacitor should be placed closest to the ADC. Driving VIN+ and VIN– The input drive requirements can best be analyzed using the equivalent circuit of Figure 9. The input signal VSIG is connected to the ADC input pins (IN+ and IN–) through an equivalent source resistance RS.Thisresistorincludesboth the actual generator source resistance and any additional optional resistors connected to the input pins. Optional input capacitors CIN are also connected to the ADC input pins. This capacitor is placed in parallel with the ADC input parasitic capacitance CPAR. Depending on the PCB layout, CPAR has typical values between 2pF and 15pF. In addition, the equivalent circuit of Figure 9 includes the converter equivalent internal resistor RSW and sampling capacitor CEQ. There are some immediate trade-offs in RS and CIN without needing a full circuit analysis. Increasing RS and CIN can give the following benefits: 1) Due to the LTC2453’s input sampling algorithm, the input current drawn by either VIN+ or VIN– over a con- version cycle is 50nA. A high RS • CIN attenuates the high frequency components of the input current, and RS values up to 1k result in <1LSB error. APPLICATIONS INFORMATION |
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