Rainbow-electronics ADC0848 Uživatelský manuál stáhnout pdf (Strana 4)

Note 9: For V

(

)

(

) the digital output code will be 0000 0000. 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 V

supply. Be careful during testing at low V

levels (4.5V), as high level analog

inputs (5V) can cause this input diode to conduct, especially at elevated temperatures, and cause errors for analog inputs near full-scale. The spec allows 50 mV

forward bias of either diode. This means that as long as the analog V

does not exceed the supply voltage by more than 50 mV, the output code will be correct. To

achieve an absolute 0 V

to5V

input voltage range will therefore require a minimum supply voltage of 4.950 V

over temperature variations, initial tolerance

and loading.

Note 10: Off channel leakage current is measured after the channel selection.

Note 11: The temperature coefficient is 0.3%/

Typical Performance Characteristics

Logic Input Threshold

Voltage vs Supply Voltage

Output Current vs

Temperature

Power Supply Current vs

Temperature

Linearity Error vs V

REF

Conversion Time vs V

SUPPLY

Conversion Time vs

Temperature

Unadjusted Offset Error vs

REF

Voltage

TL/H/5016–3

1 2 3 4 5 6 7 8 9 ... 19 20

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Rainbow-electronics ADC0848 Uživatelský manuál Strana 4

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