STR750FV1 datasheet(73/84 Pages) STMICROELECTRONICS

73 / 84 page

STR750Fxx STR751Fxx STR752Fxx STR755Fxx

Electrical parameters

73/84

ADC accuracy vs. negative injection current

Injecting negative current on specific pins listed in Table 46 (generally adjacent to the analog

input pin being converted) should be avoided as this significantly reduces the accuracy of

the conversion being performed. It is recommended to add a Schottky diode (pin to ground)

to pins which may potentially inject negative current.

Figure 42.

Typical application with ADC

Analog power supply and reference pins

The VDDA_ADC and VSSA_ADC pins are the analog power supply of the A/D converter cell.

Separation of the digital and analog power pins allow board designers to improve A/D

performance. Conversion accuracy can be impacted by voltage drops and noise in the event

of heavily loaded or badly decoupled power supply lines (see : General PCB design

guidelines on page 74).

Table 46.

List of adjacent pins

Analog input

Related adjacent pins

aNone

AIN1/P0.03

None

AIN2/P0.12

P0.11

AIN3/P0.17

P0.18 and P0.16

AIN4/P0.19

P0.24

AIN5/P0.22

None

AIN6/P0.23

P2.04

AIN7/P0.27

P1.11 and P0.26

AIN8/P0.29

P0.30 and P0.28

AIN9/P1.04

None

AIN10/P1.06

P1.05

AIN11/P1.08

P1.04 and P1.13

AIN12/P1.11

P2.17 and P0.27

AIN13/P1.12

None

AIN14/P1.13

P1.14 and P1.01

AIN15/P1.14

None

AINx

STR75XX

VDD

±1

μA

0.6V

CADC

3.2pF

VAIN

RAIN

10-Bit A/D

Conversion

Ω(max)

CAIN

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