SABRE-LL-I datasheet(79/141 Pages) STMICROELECTRONICS

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SABRE-LL-I

AD converter

79/141

15.3

A2D specification with A2dType=1

15.4

Voltage divider specifications

As can be seen in the A2D block diagram, in order to report some voltages in the A2D

working range, they are scaled with a resistor divider before the conversion.

Here below are reported the resistor voltage divider specifications:

Table 56.

ADC specification

Parameter

Description

Test condition

Min

Typ

Max

Unit(1)

The definition of LSB for this table is LSB=IMRmax/(29-1).

IMR

Measurement range

A2dType = 1

V3v3

INL

Integral non-linearity

A2dType = 1(2)(3)

Integral non linearity error (INL) is defined as the maximum distance between any point of the ADC

characteristic and the “best straight line” approximating the ADC transfer curve.

The ADC ensures monotonic characteristic and no missing codes.

±1

LSB

DNL

Differential Non-Linearity

A2dType = 1(4)(3)

Differential nonlinearity error (DNL) is defined as the difference between an actual step width and the ideal

width value of 1 LSB.

±1

LSB

Offset error

A2dType = 1(5)

Offset error (OE) is the deviation of the first code transition (000...000 to 000...001) from the ideal (i.e. GND

+ 0.5 LSB).

±4

LSB

OEDrift

Offset error drift

A2dType = 1 over time

and temperature

±3

LSB

Gain error

A2dType = 1(6)

Gain error (GE) is the deviation of the last code transition (111...110 to 111...111) from the ideal (V3v3 -

0.5 LSB), after adjusting for offset error.

±4

LSB

GEDrift

Gain error drift

A2dType = 1

over time and

temperature

±4

LSB

tconv

Minimum conversion time

µs

Resolution

bits

Cin

Input capacitance

(7)

Actual input capacitance depends on the pin that must be converted.

4pF

Table 57.

Voltage divider specification

Parameter

Description

Notes

Min

Typ

Max

Unit

RSupply_ratio VSupply divider ratio

-10%

1/15

+10%

RSupplyInt_rati

VSupply Int divider ratio

-10%

1/15

+10%

Rv3v3_ratio

V3v3 divider ratio

-10%

1/2

-10%

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