COP87L88CF Datasheet, PDF (7/40 Pages) National Semiconductor (TI) – 8-Bit CMOS OTP Microcontrollers with 16k Memory and

A/D Converter Specifications
V_CC = 5V ±10% (V_SS − 0.050V) ≤ Any Input ≤ (V_CC + 0.050V)
Parameter
Conditions
Resolution
Reference Voltage Input
AGND = 0V
Absolute Accuracy
Non-Linearity
V_REF = V_CC
V_REF = V_CC
Deviation from the
Best Straight Line
Differential Non-Linearity
Input Reference Resistance
V_REF = V_CC
Common Mode Input Range (Note 10)
DC Common Mode Error
Off Channel Leakage Current
On Channel Leakage Current
A/D Clock Frequency (Note 8)
Conversion Time (Note 7)
Min
Typ
3
1.6
AGND
1
1
0.1
12
Max
8
V_CC
±2
±¹â„2
±¹â„2
4.8
V_REF
±¹â„4
1.67
Units
Bits
V
LSB
LSB
LSB
kΩ
V
LSB
µA
µA
MHz
A/D Clock
Cycles
Note 7: Conversion Time includes sample and hold time.
Note 8: See Prescaler description.
Note 9: Pins G6 and RESET are designed with a high voltage input network for factory testing. These pins allow input voltages greater than V_CC and the pins will
have sink current to V_CC when biased at voltages greater than V_CC (the pins do not have source current when biased at a voltage below V_CC). The effective resis-
tance to V_CC is 750Ω (typical). These two pins will not latch up. The voltage at the pins must be limited to less than 14V.
Note 10: 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. The voltage on any analog input
should be −0.3V to V_CC +0.3V.
DS101134-26
FIGURE 3. MICROWIRE/PLUS Timing
7
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