SPMCK16Z4MPV20 datasheet(351/500 Pages) FREESCALE

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M68HC16 Z SERIES

ELECTRICAL CHARACTERISTICS

USER’S MANUAL

A-67

Table A-38 ADC Conversion Characteristics (Operating)

(VDD and VDDA = 5.0 Vdc ± 5% for 20/25 MHz, ± 10% for 16 MHz, VSS = 0 Vdc, TA = TL to TH,

0.5 MHz

≤ f

ADCLK ≤ 1.0 MHz, 2 clock input sample time)

Num

Parameter

Symbol

Min

Typical

Max

Unit

8-Bit Resolution1

NOTES:

1. At VRH – VRL= 5.12 V, one 10-bit count = 5 mV and one 8-bit count = 20 mV.

1 Count

—

8-Bit Differential Nonlinearity

DNL

–0.5

—

0.5

Counts

8-Bit Integral Nonlinearity

INL

–1

—

Counts

8-Bit Absolute Error2

2. 8-bit absolute error of 1 count (20 mV) includes 1/2 count (10 mV) inherent quantization error and 1/2 count

(10 mV) circuit (differential, integral, and offset) error.

–1

—

Counts

10-Bit Resolution1

1 Count

—

10-Bit Differential Nonlinearity3

3. Conversion accuracy varies with fADCLK rate. Reduced conversion accuracy occurs at maximum fADCLK. As-

sumes that minimum sample time (2 ADC clocks) is selected.

DNL

–1

—

Counts

10-Bit Integral Nonlinearity3

INL

–2.0

—

2.0

Counts

10-Bit Absolute Error3,4

4. 10-bit absolute error of 2.5 counts (12.5 mV) includes 1/2 count (2.5 mV) inherent quantization error and 2

counts (10 mV) circuit (differential, integral, and offset) error.

–2.5

—

2.5

Counts

Source Impedance at Input5

5. Maximum source impedance is application-dependent. Error resulting from pin leakage depends on junction

leakage into the pin and on leakage due to charge-sharing with internal capacitance.

Error from junction leakage is a function of external source impedance and input leakage current. Expected

error in result value due to junction leakage is expressed in voltage (VERRJ):

where IOFF is a function of operating temperature, as shown in Table A-35.

Charge-sharing leakage is a function of input source impedance, conversion rate, change in voltage between

successive conversions, and the size of the decoupling capacitor used. Error levels are best determined

empirically. In general, continuous conversion of the same channel may not be compatible with high source

impedance.

—20—

Ω

ERRJ

OFF

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