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| MC68HC705P9 Datasheet, PDF (133/160 Pages) Motorola, Inc – HCMOS Microcontroller Unit | |||
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Freescale Semiconductor, Inc.
Analog-to-Digital Converter (ADC)
Timing and Electrical Characteristics
11.6 Timing and Electrical Characteristics
Table 11-1. ADC Characteristics (VDD = 5.0 Vdc)(1)
Characteristic
Min
Max
Unit
Resolution
8
8
Bit
Absolute Accuracy (4.0 > VRH > VDD)(2)
Conversion Range (PC7/VRH)
â
±1.5
LSB
VSS
VDD
V
Conversion Time (Includes Sampling Time)
External Clock
Internal RC Oscillator (ADRC = 1)
32
32
tAD(3)
32
32
µs
Monotonicity
Inherent (Within Total Error)
Zero Input Reading (VIN = 0 V)
Full-Scale Reading (VIN = VRH)
00
01
Hex
FF
FF
Hex
Sample Acquisition Time(4)
External Clock
Internal RC Oscillator (ADRC = 1)
12
12
tAD(5)
â
12
µs
Input Capacitance
PC6/AN0, PC5/AN1, PC4/AN2, PC3/AN3
â
12
pF
Analog Input Voltage
VSS
VRH
V
Input Leakage(6)
PC6/AN0, PC5/AN1, PC4/AN2, PC3/AN3
PC7/VRH
ADC On Current Stabilization Time
â
â
±1
±1
µA
â
100
µs
1. VDD = 5.0 Vdc ±10%, VSS = 0 Vdc
2. ADC accuracy may decrease proportionately as VRH is reduced below 4.0 V.
3. tAD = cycle time of the A/D converter
4. Source impedances more than 10 k⦠adversely affect internal RC charging time during input sam-
pling.
5. tAD = tCYC (1 ÷ fOP) if MCU clock is clock source
6. External system error caused by input leakage approximately equals R source times input current.
MC68HC705P9 â Rev. 4.0
MOTOROLA
Analog-to-Digital Converter (ADC)
For More Information On This Product,
Go to: www.freescale.com
Technical Data
133
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