56F807 datasheet(44/60 Pages) FREESCALE

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56F807 Technical Data Technical Data, Rev. 15

Freescale Semiconductor

3.11 Analog-to-Digital Converter (ADC) Characteristics

Table 3-16 ADC Characteristics

Operating Conditions: VSS = VSSA = 0 V, VDD = VDDA = 3.0–3.6 V, VREF = VDD-0.3V, ADCDIV = 4, 9, or 14, (for optimal performance),

ADC clock = 4MHz, 3.0–3.6 V, TA = –40° to +85°C, CL ≤ 50pF, fOP = 80MHz

Characteristic

Symbol

Min

Typ

Max

Unit

ADC input voltages

VADCIN

For optimum ADC performance, keep the minimum VADCIN value > 25mV. Inputs less than 25mV may convert to a digital

output code of 0.

—

VREF

VREF must be equal to or less than VDDA and must be greater than 2.7V. For optimal ADC performance, set VREF to

VDDA-0.3V.

Resolution

RES

—

Bits

Integral Non-Linearity3

Measured in 10-90% range.

INL

—

+/- 2.5

+/- 4

LSB4

LSB = Least Significant Bit.

Differential Non-Linearity

DNL

—

+/- 0.9

+/- 1

LSB4

Monotonicity

GUARANTEED

ADC internal clock5

Guaranteed by characterization.

fADIC

0.5

—

MHz

Conversion range

RAD

VSSA

—VDDA

Conversion time

tADC

—6

—

tAIC cycles

tAIC = 1/fADIC

Sample time

tADS

—1

—

tAIC cycles

Input capacitance

CADI

—5

—

pF6

Gain Error (transfer gain)5

EGAIN

0.93

1.00

1.08

—

Total Harmonic Distortion5

THD

—

Offset Voltage5

VOFFSET

-90

-25

+10

Signal-to-Noise plus Distortion5

SINAD

—

Effective Number of Bits5

ENOB

—

bit

Spurious Free Dynamic Range5

SFDR

—

Bandwidth

—

100

—

KHz

ADC Quiescent Current (each dual ADC)

IADC

—50

—

VREF Quiescent Current (each dual ADC)

IVREF

—12

16.5

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