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CDK1306CTQ32 Datasheet(PDF) 9 Page - Cadeka Microcircuits LLC. |
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CDK1306CTQ32 Datasheet(HTML) 9 Page - Cadeka Microcircuits LLC. |
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9 / 11 page  ©2008 CADEKA Microcircuits LLC www.cadeka.com 9 Data Sheet Figure 4. Ladder Force/Sense Circuit Figure 5. Reference Ladder Circuit Typically, the top side voltage drop for VRHF to VRHS will equal: VRHF – VRHS = 2.25 % of (VRHF – VRLF) (typical) and the bottom side voltage drop for VRLS to VRLF will equal: VRLS – VRLF = 1.9 % of (VRHF – VRLF) (typical) Figure 5 shows an example of expected voltage drops for a specific case. VREF of 4.0V is applied to VRHF, and VRLF is tied to AGND. A 90mV drop is seen at VRHS (= 3.91V), and a 75mV increase is seen at VRLS (= 0.075V). Analog Input VIN is the analog input. The input voltage range is from VRLS to VRHS (typically 4.0V) and will scale proportionally with respect to the voltage reference. (See Voltage Refer- ence section.) The drive requirements for the analog inputs are very minimal when compared to most other converters due to the CDK1306 extremely low input capacitance of only 5pF and very high input resistance of 50kΩ. The analog input should be protected through a series resistor and diode clamping circuit as shown in Figure 6. Figure 6. Recommended Input Protection Circuit Calibration The CDK1306 uses an auto-calibration scheme to ensure 10-bit accuracy over time and temperature. Gain and offset errors are continually adjusted to 10-bit accuracy during device operation. This process is completely trans- parent to the user. Upon powerup, the CDK1306 begins its calibration algorithm. In order to achieve the calibration accuracy required, the offset and gain adjustment step size is a fraction of a 10-bit LSB. Since the calibration algorithm is an oversampling process, a minimum of 10,000 clock cycles are required. This results in a minimum calibration time upon powerup of 250μs (for a 40MHz clock). Once calibrated, the CDK1306 remains calibrated over time and temperature. Since the calibration cycles are initiated on the rising edge of the clock, the clock must be continuously applied for the CDK1306 to remain in calibration. |
Similar Part No. - CDK1306CTQ32 |
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Similar Description - CDK1306CTQ32 |
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