ST9040 datasheet(28/56 Pages) STMICROELECTRONICS

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Parameter

Typical (1)

Minimum

Maximum

Units (2)

Notes

Analog Input Range

AVCC

VCC

Conversion time

11.5

µs

(3, 4)

Sample time

µs

(3)

Power-up time

µs

Resolution

βιτσ

Monotonicity

GUARANTEED

No missing codes

GUARANTEED

Zero input reading

Hex

Full scale reading

Hex

Offset error

LSBs

(2,6)

Gain error

LSBs

(6)

Diff. Non Linearity

±.3

±.2

±.5

LSBs

(6)

Int. Non Linearity

LSBs

(6)

Absolute Accuracy

LSBs

(6)

S/N

AVCC/AVSS Resistance

13.5

Ω

Input Resistance

Ω

(5)

Hold Capacitance

Input Leakage

±3

µA

Notes:

The values are expected at 25 degree Centigrade with AVCC =5V

“LSBs”, as used here, has a value of AVCC/256

@ 12MHz internal clock

Including sample time

It must be intended as the internal series resistance before the sampling capacitor

This is a typical expected value, but not a tested production parameter.

If V(i) is the value of the i-th transition level (0 < i < 254), the performance of the A/D co nverter has been valued as follows:

OFFSET ERROR = deviation between the actual V(0) and the ideal V(0) (=1/2 LSB)

GAIN ERROR = deviation between the actual V(254) and the ideal V(254) (=AVCC-3/2 LSB)

DNL ERROR = max {[V(i) - V(i-1)]/LSB - 1}

INL ERROR = max {[V(i) - V(0)]/LSB - i}

A/D ANALOG SPECIFICATIONS

ST9040

28/56

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