COP688GD datasheet(9/42 Pages) NSC

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A/D Converter Specifications

CC =5V ±10%,(VSS– 0.050V) ≤ Any Input ≤ (VCC + 0.050V)

Parameter

Conditions

Min

Typ

Max

Units

Resolution

Bits

Absolute Accuracy

±2

LSB

Non-Linearity

Deviation from the Best Straight

Line

±1

LSB

Differential Non-Linearity

±1

LSB

Common Mode Input Range

GND

DC Common Mode Error

±1/2

LSB

Off Channel Leakage Current

µA

On Channel Leakage Current

µA

A/D Clock Frequency

0.1

1.67

MHz

Converison Time

A/D Clock Cycles

Internal Reference Resistance

1µs

Tum-on Time

Note 27: Conversion Time includes 7 A/D clock cycles sample and hold time.

Note 28: See Prescaler description.

Note 29: 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 to5VDC input

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

Note 30: Time or internal reference reistance to turn on and settle after coming out of HALT or IDLE mode.

DS100076-4

FIGURE 3. MICROWIRE/PLUS Timing

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