COP888GD Datasheet, PDF (9/42 Pages) National Semiconductor (TI) – 8-Bit CMOS ROM Based Microcontrollers with 16k

A/D Converter Specifications
V_CC = 5V ±10%, (V_SS–0.050V) ≤ Any Input ≤ (V_CC + 0.050V)
Parameter
Conditions
Min
Typ
Max
Units
Resolution
8
Bits
Absolute Accuracy
±2
LSB
Non-Linearity
Deviation from the Best Straight
Line
±1
LSB
Differential Non-Linearity
±1
LSB
Common Mode Input Range
DC Common Mode Error
GND
V_CC
±1/2
V
LSB
Off Channel Leakage Current
1
2
µA
On Channel Leakage Current
1
2
µA
A/D Clock Frequency
0.1
1.67
MHz
Converison Time
17
A/D Clock Cycles
Internal Reference Resistance
1
µs
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 V_IN(−) = V_IN (+) 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 V_CC supply. Be careful, during testing at low V_CC 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_IN does not exceed the supply voltage by more than 50 mV, the output code will be correct. To achieve an absolute 0 V_DC to 5 V_DC input
voltage range will therefore require a minimum supply voltage of 4.950 V_DC 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
9
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