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ADC12040CIVY Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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ADC12040CIVY Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 20 page Pin Descriptions and Equivalent Circuits (Continued) Pin No. Symbol Equivalent Circuit Description 14–19, 22–27 D0–D11 Digital data output pins that make up the 12-bit conversion results. D0 is the LSB, while D11 is the MSB of the offset binary output word. Output levels are TTL/CMOS compatible. ANALOG POWER 5, 6, 29 V A Positive analog supply pins. These pins should be connected to a quiet +5V voltage source and bypassed to AGND with 0.1 µF monolithic capacitors located within 1 cm of these power pins, and with a 10 µF capacitor. 4, 7, 28 AGND The ground return for the analog supply. DIGITAL POWER 13 V D Positive digital supply pin. This pin should be connected to the same quiet +5V source as is V A and bypassed to DGND with a 0.1 µF monolithic capacitor in parallel with a 10 µF capacitor, both located within 1 cm of the power pin. 9, 12 DGND The ground return for the digital supply. 21 V DR Positive digital supply pin for the ADC12040’s output drivers. This pin should be connected to a voltage source of +2.5V to +5V and bypassed to DR GND with a 0.1 µF monolithic capacitor. If the supply for this pin is different from the supply used for V A and VD, it should also be bypassed with a 10 µF tantalum capacitor. V DR should never exceed the voltage on V D. All bypass capacitors should be located within 1 cm of the supply pin. 20 DR GND The ground return for the digital supply for the ADC12040’s output drivers. This pin should be connected to the system digital ground, but not be connected in close proximity to the ADC12040’s DGND or AGND pins. See Section 5 (Layout and Grounding) for more details. www.national.com 4 |
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