IMX28AEC datasheet(27/72 Pages) FREESCALE

27 / 72 page

i.MX28 Applications Processors Data Sheet for Automotive Products, Rev. 1

Freescale Semiconductor

3.5

Module Timing and Electrical Parameters

3.5.1

ADC Electrical Specifications

This section describes the electrical specifications, including DC and AC information, of Low-Resolution

ADC (LRADC) and High-Speed ADC (HSADC).

3.5.1.1

LRADC Electrical Specifications

Table 31 shows the electrical specifications for the LRADC.

Output pad slew rate

(medium drive)

tps

1.7~1.9V

10pF

1.50

0.61

0.63

—

1.7~1.9V

20pF

0.93

1.00

0.39

0.42

—

1.7~1.9V

50pF

0.43

0.52

0.18

0.22

—

3.0~3.6V

10pF

2.40

2.43

0.98

1.05

—

3.0~3.6V

20pF

1.58

1.53

0.65

0.67

—

3.0~3.6V

50pF

0.76

0.71

0.32

0.31

—

Input pad average

hysteresis

tih

1.7 V–1.9 V

—

100

—

3.0 V–3.6 V

—

100

—

Table 31. LRADC Electrical Specifications

Parameter

Conditions

Min.

Typ.

Max.

Unit

AC Electrical Specification

Input capacitance (Cp)

No pin/pad capacitance included

—

0.5

—

Resolution

—

bits

Maximum sampling rate1

(fs)

1 There is no sample and hold circuit in LRADC, so it is only for DC input voltage or ones with very small slope.

—

428

kHz

Power-up time2

—

sample

cycles

DC Electrical Specification

DC input voltage

1.85

Current consumption3

VDDA

VDDD

——

TBD

—

Touchscreen Interface

Expected plate resistance

—

200

—

50000

Table 30. CLK-Type GPIO (continued)

Parameters

Symbol

Test Voltage Test Capacitance

Min Rise/Fall

Max Rise/Fall

units

Notes

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