MPC5643L datasheet(76/98 Pages) FREESCALE

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MPC5643L Microcontroller Data Sheet, Rev. 3

Preliminary—Subject to Change Without Notice

Electrical characteristics

Freescale Semiconductor

From this formula, in the worst case (when VA is maximum, that is for instance 5 V), assuming to accept a maximum error of

half a count, a constraint is evident on CF value:

Eqn. 15

Table 25. ADC conversion characteristics (operating)

Symbol

Parameter

Conditions1

NOTES:

1 V

DD = 3.3 V, TJ = –40 to +150 °C, unless otherwise specified and analog input voltage from VAGND to VAREF.

Min Typ Max Unit

fCK

ADC Clock frequency (depends on ADC

configuration)

(The duty cycle depends on AD_CK2 frequency)

2 AD_CK clock is always half of the ADC module input clock defined via the auxiliary clock divider for the ADC.

—3

—

MHz

SR Sampling frequency

—

— 1.00 MHz

tADC_S D

Sample time3

3 During the sample time the input capacitance CS can be charged/discharged by the external source. The internal

resistance of the analog source must allow the capacitance to reach its final voltage level within tADC_S. After the

end of the sample time tADC_S, changes of the analog input voltage have no effect on the conversion result. Values

for the sample clock tADC_S depend on programming.

TBD

—

TBD

—

— TBD

µs

tADC_C P Conversion time

4 This parameter does not include the sample time t

ADC_S, but only the time for determining the digital result and the

time to load the result register with the conversion result.

TBD

0.625 —

—

µs

5 See Figure 22.

D ADC input sampling capacitance

—

— 7.32

CP1

D ADC input pin capacitance 1

—

— TBD

CP2

D ADC input pin capacitance 2

—

— TBD

RSW1

Internal resistance of analog source

VREF range = 4.5 to 5.5 V

—

0.6

VREF range = 3.0 to 3.6 V

—

0.9

RAD

D Internal resistance of analog source

—

825

IINJ

Input current injection

Current injection on one ADC

input, different from the

converted one. Remains

within TUE spec.

TBD

— TBD mA

INL

P Integral non linearity

—

–3

—

LSB

DNL

P Differential non linearity

—

–1.0

—

1.0 LSB

OFS

T Offset error

—

–4

—

LSB

GNE

T Gain error

—

±1

—

LSB

TUE

P Total unadjusted error without current injection

—

–6

—

LSB

TUE

T Total unadjusted error with current injection

—

TBD

— TBD LSB

2048 C

•

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