MC68HC705P9CS datasheet(133/160 Pages) FREESCALE

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Analog-to-Digital Converter (ADC)

Timing and Electrical Characteristics

MC68HC705P9 — Rev. 4.0

Technical Data

MOTOROLA

Analog-to-Digital Converter (ADC)

133

11.6 Timing and Electrical Characteristics

Table 11-1. ADC Characteristics (V

DD = 5.0 Vdc)

(1)

1. VDD = 5.0 Vdc ±10%, VSS = 0 Vdc

Characteristic

Min

Max

Unit

Resolution

Bit

Absolute Accuracy (4.0 > VRH > VDD)

(2)

2. ADC accuracy may decrease proportionately as VRH is reduced below 4.0 V.

—

±1.5

LSB

Conversion Range (PC7/VRH)

VSS

VDD

Conversion Time (Includes Sampling Time)

External Clock

Internal RC Oscillator (ADRC = 1)

tAD

(3)

µs

3. tAD = cycle time of the A/D converter

Monotonicity

Inherent (Within Total Error)

Zero Input Reading (VIN = 0 V)

Hex

Full-Scale Reading (VIN = VRH)

Hex

Sample Acquisition Time(4)

External Clock

Internal RC Oscillator (ADRC = 1)

4. Source impedances more than 10 k

Ω adversely affect internal RC charging time during input sam-

pling.

—

tAD

(5)

µs

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

Input Capacitance

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

—

Analog Input Voltage

VSS

VRH

Input Leakage(6)

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

PC7/VRH

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

—

±1

µA

ADC On Current Stabilization Time

—

100

µs

Freescale Semiconductor, Inc.

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