IMX28CEC datasheet(29/70 Pages) FREESCALE

29 / 70 page

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

Freescale Semiconductor

3.5.1.2

HSADC Electrical Specification

Table 32 shows the electrical specifications for the HSADC

3.5.2

DPLL Electrical Specifications

This section includes descriptions of the USB PLL electrical specifications and Ethernet PLL electrical

specifications.

3.5.2.1

USB PLL Electrical Specifications

The i.MX28 integrates a high-frequency USB PLL that provides the 480-MHz clock for the USB and other

system blocks.

Table 33 lists the USB PLL output electrical specifications.

2 This comprises only the required initial dummy conversion cycle, NOT including the Analog part power-up time.

3 This value only includes the ADC and the driver switches, but it does not take into account the current consumption in the

touchscreen plate. For example, if the plate resistance is 200 ohm, the total current consumption is about 11 mA.

Table 32. HSADC Electrical Specification

Parameter

Conditions

Min.

Typ.

Max.

Unit

AC Electrical Specification

Input sampling

capacitance (Cs)

No pin/pad capacitance included

—

0.5

—

Resolution

—

bits

Maximum sampling rate

(fs)

——

—

MHz

Power-up time

—

sample

cycles

DC Electrical Specification

DC input voltage

—

0.5

—

VDDA-0.5

Current Consumption

VDDA

VDDD

——

TBD

—

DNL

fin = 1 kHz

—

TBD

LSB

INL

fin = 1kHz

—

TBD

LSB

Table 33. USB PLL Specifications

Parameter

Test Conditions

Min

Typ

Max

Unit

PLL lock time

—

µs

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