C164CI datasheet(41/53 Pages) INFINEON

41 / 53 page

Semiconductor Group

1998-02

C164CI

A/D Converter Characteristics

VDD = 4.25 - 5.5 V;

SS = 0 V

A = -40 to +85 °C

for SAF-C164CI

A = -40 to +125 °C

for SAK-C164CI

4.0 V

≤ V

AREF ≤ VDD+0.1 V ; VSS-0.1 V ≤ VAGND ≤ VSS+0.2 V

Sample time and conversion time of the C164CI’s A/D Converter are programmable. The table

below should be used to calculate the above timings.

The limit values for

BC must not be exceeded when selecting ADCTC.

Converter Timing Example:

Assumptions:

fCPU = 20 MHz (ie. tCPU = 50 ns), ADCTC = ’00’, ADSTC = ’00’.

Basic clock

fBC

= fCPU / 4 = 5 MHz, ie. tBC = 200 ns.

Sample time

= tBC * 8 = 1600 ns.

Conversion time tC

= tS + 40 tBC + 2 tCPU = (1600 + 8000 + 100) ns = 9.7 µs.

Parameter

Symbol

Limit Values

Unit

Test Condition

min.

max.

Analog input voltage range

AIN

AGND

AREF

Basic clock frequency

0.5

MHz

Conversion time

CC –

BC +

S + 2 tCPU

CPU = 1 / fCPU

Total unadjusted error

TUE CC –

± 2LSB 4)

Internal resistance of reference

voltage source

AREF SR

–

BC / 60

- 0.25

Ω

BC in [ns]

5) 6)

Internal resistance of analog

source

ASRC SR

–

S / 450

- 0.25

Ω

S in [ns]

6) 7)

ADC input capacitance

AIN

CC –

ADCON.15|14

(ADCTC)

A/D Converter Basic clock

fBC

ADCON.13|12

(ADSTC)

Sample time tS

fCPU / 4

tBC * 8

fCPU / 2

tBC * 16

fCPU / 16

tBC * 32

fCPU / 8

tBC * 64

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