68HC05P9A datasheet(78/90 Pages) FREESCALE

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GENERAL RELEASE SPECIFICATION

ELECTRICAL SPECIFICATIONS

MC68HC05P9A

13-4

Rev. 2.0

13.4

A/D Converter Characteristics

Table 13-3. A/D Converter Characteristics

Characteristic

Min

Max

Unit

Resolution

Bit

Absolute Accuracy (4.0 V > VRH > VDD)

(See Note 1)

—

±1–1/2

LSB

Conversion Range

VRH

VSS

VRH

VDD

Conversion Time (Includes Sampling Time)

External Clock (XTAL)

Internal RC Oscillator (ADRC = 1)

—

tAD

µs

Power-Up Time

—

100

µs

Monotonicity

Inherent (Within Total Error)

Zero Input Reading (Vin = 0 V)

Hex

Full-Scale Reading (Vin = VRH)

Hex

Sample Acquisition Time (see Note 2)

External Clock (XTAL)

Internal RC Oscillator (ADRC = 1)

—

tAD

µs

Input Capacitance

PC3/AN3–PC6/AN0

—12

Analog Input Voltage

VSS

VRH

Input Leakage (see Note 4)

AN0–AN3

VRH

—

±1

µA

NOTES:

1. A/D accuracy may decrease proportionately as VRH is reduced below 4.0 V.

2. Source impedances greater than 10 k

Ω adversely affect internal RC charging time during input sampling.

3. tAD = tcyc if clock source is MCU.

4. The external system error caused by input leakage current is approximately equal to the product of R source and input

current.

Freescale Semiconductor, Inc.

For More Information On This Product,

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