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LTC2380-16 Datasheet(PDF) 27 Page - Linear Technology |
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LTC2380-16 Datasheet(HTML) 27 Page - Linear Technology |
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27 / 52 page  LTC2373-16 27 237316fa For more information www.linear.com/LTC2373-16 Figure 11c. 32k Point FFT fSMPL = 1Msps, fIN = 1kHz for Circuit Shown in Figure 11b ADC REFERENCE There are three ways of providing the ADC reference. The first is to use both the internal reference and reference buffer. The second is to externally overdrive the internal reference and use the internal reference buffer. The third is to disable the internal reference buffer and overdrive the REFBUF pin from an external source. The following tables give examples of these cases and the resulting fully differential, unipolar and bipolar input ranges. Table 2. Internal Reference with Internal Buffer REFIN REFBUF FULLY DIFFERENTIAL INPUT RANGE UNIPOLAR INPUT RANGE BIPOLAR INPUT RANGE 2.048V 4.096V ±4.096V 0V to 4.096V ±2.048V Table 3. External Reference with Internal Buffer REFIN (OVERDRIVE) REFBUF FULLY DIFFERENTIAL INPUT RANGE UNIPOLAR INPUT RANGE BIPOLAR INPUT RANGE 1.25 (Min) 2.5V ±2.5V 0V to 2.5V ±1.25V 2.048V 4.096V ±4.096V 0V to 4.096V ±2.048V 2.4V (Max) 4.8V ±4.8V 0V to 4.8V ±2.4V Table 4. External Reference Unbuffered REFIN REFBUF FULLY DIFFERENTIAL INPUT RANGE UNIPOLAR INPUT RANGE BIPOLAR INPUT RANGE 0V 2.5V (Min) ±2.5V 0V to 2.5V ±1.25V 0V 5V (Max) ±5V 0V to 5V ±2.5V applicaTions inForMaTion Figure 12a. LTC2373-16 Internal Reference Circuit Internal Reference with Internal Buffer The LTC2373-16 has an on-chip, low noise, low drift (20ppm/°C), temperature compensated bandgap refer- ence that is factory trimmed to 2.048V. It is internally connectedtoareferencebufferasshowninFigure12aand is available at REFIN (Pin 13). REFIN should be bypassed to GND with a 0.1μF ceramic capacitor to minimize noise. The reference buffer gains the REFIN voltage by two to 4.096V at REFBUF (Pin 12). Bypass REFBUF to GND with at least 47μF ceramic capacitor (X7R, 10V, 1210 size) to compensate the reference buffer and minimize noise. Figure 12b. Using the LTC6655-2.048 as an External Reference External Reference with Internal Buffer If more accuracy and/or lower drift is desired, REFIN can be easily overdriven by an external reference since a 15k resistor is in series with the reference as shown in Figure 12b. REFIN can be overdriven in the range from 1.25V to 2.4V. The resulting voltage at REFBUF will be 2 × REFIN. Linear Technology offers a portfolio of high performance references designed to meet the needs of SNR = 94dB THD = –107.3dB SINAD = 93.8dB SFDR = 109.5dB FREQUENCY (kHz) 0 100 200 300 400 500 –180 –160 –140 –120 –100 –80 –60 –40 –20 0 237316 F11c 237316 F12a 47µF 6.5k 15k LTC2373-16 REFERENCE BUFFER REFBUF REFIN GND BANDGAP REFERENCE 6.5k 0.1µF 237316 F12b 47µF 6.5k 15k LTC2373-16 REFERENCE BUFFER REFBUF REFIN GND BANDGAP REFERENCE 6.5k 2.7µF LTC6655-2.048 |
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