CYT4DNJBJS datasheet(122/209 Pages) INFINEON

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Datasheet

122

002-24601 Rev. *I

2023-02-14

TRAVEO™ T2G 32-bit Automotive MCU

Based on Arm® Cortex®-M7 dual

Electrical specifications

Figure 26-5

Integral and differential linearity errors

Figure 26-6

ADC equivalent circuit for analog input

0xFFF

0xFFE

0xFFD

0x001

0x002

0x003

Analog input

VREFL

Actual conversion

characteristics

Actual conversion

characteristics

Ideal

characteristics

VNT

(Measured value)

N + 1

N -2

N - 1

Analog input

VREFL

VREFH

Integral linearity error

Differential linearity error

(1 LSb [N - 1] + VZT)

VFST

(Measured value)

0x004

VZT

(Measured value)

Actual conversion

characteristics

Ideal

characteristics

Actual conversion

characteristics

VNT

(Measured value)

V(N+ 1)T

(Measured value)

Integral linearity error of digital output N = (VNT – {1 LSb × (N – 1) + VZT}) / 1 LSb

[LSb]

Differential linearity error of digital output N = (V(N + 1)T – VNT – 1 LSb ) / 1 LSb

[LSb]

1 LSb = (VFST – VZT ) / 4094

[V]

VZT: Voltage for which digital output changes from 0x000 to 0x001

VFST: Voltage for which digital output changes from 0xFFE to 0xFFF.

REXT

VDDIO

CEXT

CIN

RVIN

CVIN

EXTERNAL CIRCUIT

INTERNAL EQUIVALENT CIRCUIT

ESD Protection

Channel selection MUX and ADC

REXT: Source impedance

CEXT: On-PCB capacitance

CIN: I/O pad or Input capacitance

RVIN: ADC equivalent input resistance

CVIN: ADC equivalent input capacitance

K: Constant for sampling accuracy, K = ln(abs(4096/LSbSAMPLE))

Sampling Time (tSAMPLE) requirement is shown in the following equation

tSAMPLE > K x { CVIN x ( RVIN + REXT ) + ( CIN + CEXT ) x (REXT) } [seconds]

K = 9.0" is recommended to get ±0.5 LSB sampling accuracy at 12-bit (LSbSAMPLE = ±0.5)

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