STR710FZ1 datasheet(67/80 Pages) STMICROELECTRONICS

67 / 80 page

STR71xFxx STR710RZ

Electrical parameters

Doc ID 10350 Rev 13

67/80

Data are based on characterisation and are not tested in production.

ADC Accuracy vs. Negative Injection Current

Injecting negative current on any of the standard (non-robust) analog input pins should be

avoided as this significantly reduces the accuracy of the conversion being performed on

another analog input. It is recommended to add a Schottky diode (pin to ground) to standard

analog pins which may potentially inject negative current. The effect of negative injection

current on robust pins is specified in Section 4.3.5.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in

Section 4.3.5 does not affect the ADC accuracy.

Table 41.

ADC accuracy with fPCLK2 = 20 MHz, fADC=10 MHz, AVDD=3.3 V

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

ADC_DATA(0V)

Converted code when AIN=0V 1)

2370

2565

Dec-

imal

code

ADC_DATA(2.5V) Converted code when AIN=2.5V 1)

1480

1680

VCM

Center voltage of Sigma-Delta

Modulator1)

1.23

1.25

1.30

TUE

Total unadjusted error

In this type of ADC, calibration is necessary to correct

gain error and offset errors. Once calibrated, the TUE is

limited to the ILE.

|ED|

Differential linearity error1)

1.96

2.19

LSB

|EL|

Integral linearity error 1)

2.36

3.95

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