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WM0838IDW Datasheet(PDF) 6 Page - Wolfson Microelectronics plc |
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WM0838IDW Datasheet(HTML) 6 Page - Wolfson Microelectronics plc |
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6 / 16 page  Wolfson Microelectronics 6 WM0834, WM0838 Notes: 1. Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at or beyond these limits. De- vice functional operating range limits are given under Recommended Operating Conditions. Guaranteed performance specifications are given under Electrical Characteristics at the test conditions specified. 2. All voltage values, except differential voltages are with respect to the ground. 3. When the input voltage V IN at any pin exceeds the power supply rails (GND > V IN > V CC ) the absolute value of current at that pin should be limited to 5 mA or less. The 20 mA package input current limits the number of pins that can exceed the power supply boundaries with a 5 mA supply current to four. 4. A clock duty cycle range of 40% to 60% ensures correct operation at all clock frequencies. For a clock with a duty cycle outside these limits, the minimum time the clock is high or low must be at least 666 ns, with the maximum time for clock high or low being 60 ms. 5. All typical values are at VCC = 5 V, T A = 25 oC for 5V devices and VCC = 3.3 V, T A = 25 oC for 3.3V devices. Electrical Characteristics (continued) 6. All parameters are measured under open-loop conditions with zero common mode input voltage (unless otherwise stated). 7. Total Unadjusted Error (TUE) is the sum of integral lin- earity error, zero code error and full scale error over the output code range. 8. A Differential linearity of "n" bits ensures a code width exist to "n" bits. Hence a Differential Linearity of 8 bits for an 8 bit ADC guarantees no missing codes. 9. For V IN (-) greater than or equal to VIN(+) the digital out- put code will be 00 Hex. Connected to each analogue input are two diodes which will forward conduct for a diode drop outside the supply rails, V CC and GND. If an analogue input voltage does not exceed the supply volt- age by more than 50 mV, the output code will be cor- rect. To use an absolute input voltage range of 0 to V CC a minimum V CC - 0.05 V is required for all variations of temperature. Care should be exercised when testing at low V CC levels with a maximum analogue voltage as this can cause the input diode to conduct, especially at high temperature, and cause errors for analogue inputs near full scale. 10. Standby input leakage currents, are currents going in or out of the on or off channels when the ADC is not performing conversion and the clock input is in a high or low steady-state condition. |
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