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SPT7850 Datasheet(PDF) 10 Page - Cadeka Microcircuits LLC. |
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SPT7850 Datasheet(HTML) 10 Page - Cadeka Microcircuits LLC. |
10 / 13 page 10 6/15/01 SPT7850 DIGITAL OUTPUTS The digital outputs (D0–D10) are driven by a separate supply (OVDD) ranging from +3 V to +5 V. This feature makes it possible to drive the SPT7850’s TTL/CMOS- compatible outputs with the user’s logic system supply. The format of the output data (D0–D9) is straight binary. (See table III.) The outputs are latched on the rising edge of CLK. These outputs can be switched into a tri-state mode by bringing EN high. Table III – Output Data Information ANALOG INPUT OVERRANGE OUTPUT CODE D10 D9–D0 +F.S. + 1/2 LSB 1 1 1 1 1 1 1 1 1 1 1 +F.S. –1/2 LSB 0 1 1 1 1 1 1 1 1 1Ø +1/2 F.S. 0 ØØ ØØØØ ØØØØ +1/2 LSB 0 0 0 0 0 0 0 0 0 0 Ø 0.0 V 0 0 0 0 0 0 0 0 0 0 0 (Ø indicates the flickering bit between logic 0 and 1.) OVERRANGE OUTPUT The OVERRANGE OUTPUT (D10) is an indication that the analog input signal has exceeded the positive full- scale input voltage by 1 LSB. When this condition occurs, D10 will switch to logic 1. All other data outputs (D0 to D9) will remain at logic 1 as long as D10 remains at logic 1. This feature makes it possible to include the SPT7850 in higher resolution systems. EVALUATION BOARD The EB7850 evaluation board is available to aid designers in demonstrating the full performance of the SPT7850. This board includes a reference circuit, clock driver circuit, output data latches, and an on-board reconstruction of the digital data. An application note describing the operation of this board, as well as information on the testing of the SPT7850, is also available. Contact the factory for price and availability. |
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