ST7LITE09 datasheet(103/122 Pages) STMICROELECTRONICS

103 / 122 page

ST7LITE0, ST7SUPERLITE

103/122

ADC CHARACTERISTICS (Cont’d)

13.11.0.1 General PCB Design Guidelines

To obtain best results, some general design and

layout rules should be followed when designing

the application PCB to shield the noise-sensitive,

analog physical interface from noise-generating

CMOS logic signals.

– Properly place components and route the signal

traces on the PCB to shield the analog inputs.

Analog signals paths should run over the analog

ground plane and be as short as possible. Isolate

analog signals from digital signals that may

switch while the analog inputs are being sampled

by the A/D converter. Do not toggle digital out-

puts on the same I/O port as the A/D input being

converted.

ADC Accuracy

TA = -40°C to 85°C, unless otherwise specified

Notes:

1) Data based on characterization results over the whole temperature range, monitored in production.

2) Injecting negative current on any of the analog input pins significantly reduces the accuracy of any conversion being

performed on any analog input.

Analog pins can be protected against negative injection by adding a Schottky diode (pin to ground). Injecting negative

current on digital input pins degrades ADC accuracy especially if performed on a pin close to the analog input pins.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 13.8 does not affect the ADC

accuracy.

Symbol

Parameter

Conditions

Typ

Max

Unit

Total unadjusted error 2)

fCPU=4MHz, fADC=2MHz ,VDD=5.0V

±1

LSB

Offset error 2)

-0.5 / +1

Gain Error 2)

±1

Differential linearity error 2)

±11)

Integral linearity error 2)

±11)

Total unadjusted error 2)

fCPU=8MHz, fADC=4MHz ,VDD=5.0V

±2

LSB

Offset error 2)

-0.5 / 3.5

Gain Error 2)

-2 / 0

Differential linearity error 2)

±11)

Integral linearity error 2)

±11)

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