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ST10F166

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18.4 A/D Converter Characteristics

CC =5 V

± 10 %;

SS =0V

A = 0 to +70

°C

for ST10F166/166-16

4.0 V

≤ V

AREF

≤ V

CC+0.1 V; VSS-0.1 V

≤ V

AGND

≤ V

SS+0.2 V

Notes:

1) V

AIN may exceed VAGND or VAREF up to the absolute maximum ratings. However, the conversion result in

these cases will be X000H or X3FFH, respectively.

2) During the sample time the input capacitance C

I can be charged/discharged by the external source. The

internal resistance of the analog source must allow the capacitors to reach their final voltage level within

tS. After the end of the sample timetS, changes of the analog input voltage have no effect on the conversion

result.

The value for the sample clock is

tSC = TCL * 32.

3) This parameter includes the sample time t

S, the time for determining the digital result and the time to load

the result register with the conversion result.

The value for the conversion clock is

tCC = TCL * 32.

4) This parameter depends on the ADC control logic. It is not a real maximum value, but rather a fixum.

5) TUE is tested at V

AREF=5.0V, VAGND=0V, VCC=4.8V. It is guaranteed by design characterization for all

other voltages within the defined voltage range.

6) During the conversion the ADC’s capacitance must be repeatedly charged or discharged. The internal

resistance of the reference voltage source must allow the capacitors to reach their respective voltage level

within

tCC. The maximum internal resistance results from the CPU clock period.

7) Not 100% tested, guaranteed by design characterization.

Parameter

Symbol

Limit Values

Unit

Test Condition

min.

max.

Analog input voltage range

AIN

AGND

AREF

V1)

Sample time

–

2 t

2) 4)

Conversion time

–

10 tCC +tS +

4TCL

3) 4)

Total unadjusted error

TUE CC

–

± 3

LSB

Internal resistance of reference

voltage source 7)

AREF

–

CC /250

- 0.25

Ω t

CC in [ns] 6) 7)

Internal resistance of analog

source 7)

ASRC CC

–

S / 500

- 0.25

Ω t

S in [ns] 2) 7)

ADC input capacitance 7)

AIN

–

AREF Supply Current

REF

–5

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