MC68HC05P9A Datasheet, PDF(121/158 Page) Freescale Semiconductor, Inc

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MC68HC05P9A Datasheet, PDF (121/158 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

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Freescale Semiconductor, Inc.

ADC

Timing and Electrical Characteristics

Table 25. ADC Characteristics (VDD = 5.0 Vdc)(1)

Characteristic

Symbol Min

Max

Unit

Resolution

Absolute Accuracy (4.0 > VRH > VDD)(2)

Conversion Range (PC7/VRH)

Conversion Time (Includes Sampling Time)

External Clock

Internal RC Oscillator (ADRC = 1)

Bit

Â±1.5

LSB

VSS

VDD

tAD(3)

Âµs

Monotonicity

â Inherent (Within Total Error)

Analog Input Voltage

Zero Input Reading (VIN = 0 V)

Full-Scale Reading (VIN = VRH)

Sample Acquisition Time(4)

External Clock

Internal RC Oscillator (ADRC = 1)

VIN

VSS

VRH

Hex

tAD(5)

Âµs

Input Capacitance

PC6/AN0, PC5/AN1, PC4/AN2, PC3/AN3

CIN

Input Leakage(6)

PC6/AN0, PC5/AN1, PC4/AN2, PC3/AN3

PC7/VRH

Â±1

ÂµA

ADC On Current Stabilization Time

tADON

100

Âµs

ADC RC Stabilization Time (ADRC = 1)

tADRC

100

Âµs

1. VDD = 5.0 Vdc Â±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 kâ¦ adversely affect internal RC charging time during input

sampling.

5. tAD = tCYC (1 Ã· fOP) if MCU clock is clock source

6. External system error caused by input leakage approximately equals R source times input

current.

9-mc68hc05p9a

MOTOROLA

ADC

121

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