Siemens EF 88H Series Bedienungsanleitung PDF herunterladen (Seite 126)

Device Specification

Semiconductor Group 7-64

A/D Converter Characteristics

= 5 V + 10 %, – 15 %; V

= 0 V

AREF

= V

± 5%; V

AGND

= V

± 0.2 V;

= 0 to 70

C for the SAB 80C517A/83C517A-5

= – 40 to 85

C for the SAB 80C517A-T3/83C517A-5-T3

= – 40 to 110

C for the SAB 80C517A-T4/83C517A-5-T4

Parameter Symbol Limit values Unit Test condition

min. typ. max.

Analog input capacitance C

25 70 pF

Sample time

(inc. load time)

4 t

µs

Conversion time

(inc. sample time)

14 t

µs

Total unadjusted error TUE ± 2 LSB V

AREF

= V

AGND

= V

AREF

supply current I

REF

± 20 µA

= (8*2

ADCL

)

OSC

; (t

= 1/f

ADC

; f

ADC

= f

OSC

/(8*2

ADCL

))

This parameter specifies the time during the input capacitance C

can be charged/discharged by the

external source. It must be guaranteed, that the input capacitance C

, is fully loaded within this time.

4TCY is 2 µs at the f

OSC

= 16 MHz. After the end of the sample time T

, changes of the analog input

voltage have no effect on the conversion result.

This parameter includes the sample time T

14TCY is 7 µs at f

OSC

= 16 MHz.

The differencial impedance r

of the analog reference source must be less than 1 KΩ at reference supply

voltage.

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