MC68HC16Z1CPV16 Datasheet, PDF(350/500 Page) Freescale Semiconductor, Inc – Symbols and Operators, CPU16 Register Mnemonics

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MC68HC16Z1CPV16 Datasheet, PDF (350/500 Pages) Freescale Semiconductor, Inc – Symbols and Operators, CPU16 Register Mnemonics

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Freescale Semiconductor, Inc.

Table A-37 Low Voltage ADC Conversion Characteristics (Operating)

(VDD and VDDA = 2.7 to 3.6 Vdc , VSS = 0 Vdc, TA = TL to TH, fADCLK = 1.05 MHz)

Num

Parameter

1 8-Bit Resolution1

Symbol

Min

Typical

Max

Unit

1 Count

â

12

â

mV

2 8-Bit Differential Nonlinearity

DNL

â0.5

â

0.5

Counts

3 8-Bit Integral Nonlinearity

4 8-Bit Absolute Error2

5 10-Bit Resolution1

6 10-Bit Differential Nonlinearity3

7 10-Bit Integral Nonlinearity3

8 10-Bit Absolute Error3,4

9 Source Impedance at Input5

INL

â1.0

â

AE

â1.5

â

1 Count

â

3

DNL

â1

â

INL

â2.0

â

AE

â4

â

RS

â

20

1.0

Counts

1.5

Counts

â

mV

1

Counts

2.0

Counts

4.0

Counts

â

kâ¦

NOTES:

1. At VRH â VRL= 3.072 V, one 10-bit count = 3 mV and one 8-bit count = 12 mV.

2. 8-bit absolute error of 1.5 counts (18 mV) includes 1/2 count (6 mV) inherent quantization error and 1 count

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

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

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

4. 10-bit absolute error of 4.0 counts (12 mV) includes 1/2 count (1.5 mV) inherent quantization error and 3.5

counts (10.5 mV) circuit (differential, integral, and offset) error.

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):

VERRJ = RS Ã IOFF

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.

A-66

ELECTRICAL CHARACTERISTICS

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