MAC7200 datasheet(967/976 Pages) FREESCALE

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Analog-to-Digital Converter Characteristics

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

889

A.16.3

ATD Timing Specifications

Table A-32. ATD Timing Specifications

Num C

Parameter

Symbol

Min

Typ

Max

Unit

D ATD Module Clock Frequency

fMODCLK

fSYS

1 (min)

1. tSYS = 1/fSYS. See parameter C7.

—fSYS

1 (max)

MHz

D ATD Conversion Clock

Frequency

fATDCLK

0.5

—

MHz

D ATD 12-bit Conversion Time for

Single-ended Conversions

Without Pre-discharge2

2. The conversion time consists of the sampling time (minimum 2, maximum 128), the time to convert the sampled voltage, the

result adjustment and the time needed for internal processing

tCONV12

17.5 x tATDCLK +

2 x tSYS

or3

17 x tATDCLK +

7 x tSYS

3. For the min value, use whichever total time is shorter

—

143.5 x tATDCLK +

2 x tSYS

or4

143 x tATDCLK +

7 x tSYS

4. For the max value, use whichever total time is longer

μs

Table A-33. ATD External Trigger Timing Specifications

Num

Rating

Symbol

Min

Typ

Max

Unit

D ETRIG Minimum Period

TPERIOD

——

tSYS

1. tSYS = 1/fSYS. See parameter C7.

D ETRIG Minimum Pulse Width

tPW

2—

—

tSYS

D ETRIG Level Recovery2

2. Time prior to end of conversion that the ETRIG pin must be deactivated so that another conversion sequence does not start.

tLR

2—

—

tSYS

D Conversion Start Delay

tDLY

——

tSYS

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