ST90135 datasheet(185/190 Pages) STMICROELECTRONICS

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ST90158 - ELECTRICAL CHARACTERISTICS

A/D ANALOG SPECIFICATIONS (VDD = 4.5V TO 5.0 V)

Notes:

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

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 converter has been valued as follows:

OFFS ET 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}

ABS. ACCURA CY= overall max conversion error

S/N ratio has been valued by sampling a sinusoidal input waveform and then calculating its Fast Fourier Transform.

Absolute accuracy: 2.5 LSB at 3V.

Parameter

Typical

Minimum

Maximum

Units (1)

Notes

Conversion time

138

INTCLK

(2)

Sample time

87.51

INTCLK

Power-up time

µs

Resolution

bits

Monotonicity

GUARANTEED

No missing codes

GUARANTEED

Zero input reading

Hex

Full scale reading

Hex

Offset error

LSBs

(1,4)

Gain error

LSBs

(4)

Diff. Non Linearity

±.3

±.2

±.5

LSBs

(4)

Int. Non Linearity

LSBs

(4)

Absolute Accuracy

LSBs

(4)(5)

AVCC/AVSS Resistance

13.5

Ω

Input Resistance

Ω

(3)

Hold Capacitance

Input Leakage

±3

µA

ST90135 Datasheet(PDF) 185 Page - STMicroelectronics

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