COP884CF datasheet(11/44 Pages) NSC

11 / 44 page

A/D Converter Specifications (Continued)

Note 17: Pins G6 and RESET are designed with a high voltage input network for factory testing. These pins allow input voltages greater than VCC and the pins will

have sink current to VCC when biased at voltages greater than VCC (the pins do not have source current when biased at a voltage below VCC). The effective resis-

tance to VCC is 750Ω (typical). These two pins will not latch up. The voltage at the pins must be limited to less than 14V.

Note 18: For VIN(−)≥VIN(+) the digital output code will be 0000 0000. Two on-chip diodes are tied to each analog input. The diodes will forward conduct for analog

input voltages below ground or above the VCC supply. Be careful, during testing at low VCC 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 VIN does not exceed the supply voltage by more than 50 mV, the output code will be correct. To achieve an absolute 0 VDC to 5 VDC input

voltage range will therefore require a minimum supply voltage of 4.950 VDC over temperature variations, initial tolerance and loading. The voltage on any analog input

should be −0.3V to VCC +0.3V.

DS009425-26

FIGURE 3. MICROWIRE/PLUS Timing

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