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ADC0817CCN Scheda tecnica(PDF) 4 Page - Texas Instruments |
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ADC0817CCN Scheda tecnica(HTML) 4 Page - Texas Instruments |
4 / 18 page ADC0816, ADC0817 SNAS527C – JUNE 1999 – REVISED MARCH 2013 www.ti.com Electrical Characteristics Converter Specifications: VCC = 5 VDC = VREF(+), VREF(−)= GND, VIN = VCOMPARATOR IN,TMIN ≤ TMAX and fCLK = 640 kHz unless otherwise stated. Symbol Parameter Conditions Min Typ Max Units ADC0816 Total Unadjusted Error 25°C ±½ LSB See Note (1) TMIN to TMAX ±¾ LSB ADC0817 Total Unadjusted Error 0°C to 70°C ±1 LSB See Note (1) TMIN to TMAX ±1¼ LSB Input Resistance From Ref(+)to Ref( −) 1.0 4.5 k Ω Analog Input Voltage Range V(+) or V( −) (2) GND − 0.1 VCC + 0.1 VDC VREF(+) Voltage, Top of Ladder Measured at Ref(+) VCC VCC+0.1 V V Voltage, Center of Ladder VCC/2 − 0.1 VCC/2 VCC/2 + 0.1 VREF(−) Voltage, Bottom of Ladder Measured at Ref( −) −0.1 0 V Comparator Input Current fc = 640 kHz, (3) −2 ±0.5 2 µA (1) Total unadjusted error includes offset, full-scale, and linearity errors. See Figure 3. None of these A/Ds requires a zero or full-scale adjust. However, if an all zero code is desired for an analog input other than 0.0V,or if a narrow full-scale span exists (for example: 0.5V to 4.5V full-scale)the reference voltages can be adjusted to achieve this. See Figure 13. (2) Two on-chip diodes are tied to each analog input which will forward conduct for analog input voltages one diode drop below ground or one diode drop greater than the VCCsupply. The spec allows 100 mV forward bias of either diode. This means that as long as the analog VIN does not exceed the supply voltage by more than 100 mV, the output code will be correct. To achieve an absolute0 VDC to 5 VDC input voltage range will therefore require a minimum supply voltage of 4.900 VDC over temperature variations, initial tolerance and loading. (3) Comparator input current is a bias current into or out of the chopper stabilized comparator. The bias current varies directly with clock frequency and has little temperature dependence (Figure 6). 4 Submit Documentation Feedback Copyright © 1999–2013, Texas Instruments Incorporated Product Folder Links: ADC0816 ADC0817 |
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