AN2555 - Application note

Modified features

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In the default configuration the sample time of the ST10F276Z5 is 2.5 times longer compared to that of

the ST10F269Zx. This has an impact on the frequency of the input signal that can be applied to the

ST10F276Z5.

1.4.2

Hardware impacts

Electrical characteristics

Table 6 lists the differences in the DC characteristics of the two devices. The main points are:

●

to the power supply: Connecting a resistor would create a voltage shift in the analog reference.

●

●

DNL, INL and OFS are different: the ADC conversion curves for the 2 devices are different.

Table 5.

ST10F276Z5 vs. ST10F269Zx sample time comparison table

ADCTC

ADSTC

ST10F269Zx Sample

Time

ST10F276Z5 Sample

Time

Ratio F276Z5 / F269Zx

00

00

TCL * 48

TCL * 120

2.5

00

01

TCL * 96

TCL * 140

1.46

00

10

TCL * 192

TCL * 200

1.04

00

11

TCL * 384

TCL * 400

1.04

11

00

TCL * 96

TCL * 240

2.5

11

01

TCL * 192

TCL * 280

1.46

11

10

TCL * 384

TCL * 400

1.04

11

11

TCL * 768

TCL * 800

1.04

10

00

TCL * 192

TCL * 480

2.08

10

01

TCL * 384

TCL * 560

1.46

10

10

TCL * 768

TCL * 800

1.04

10

11

TCL * 1538

TCL * 1600

1.04