56F8335 datasheet(144/160 Pages) FREESCALE

144 / 160 page

56F8335 Technical Data, Rev. 1

144

Freescale Semiconductor

Preliminary

Conversion time

tADC

—6

—

tAIC cycles

Sample time

tADS

—1

—

tAIC cycles

Input capacitance

CADI

—5

—

Input injection current5, per pin

IADI

——

Input injection current, total

IADIT

——

VREFH current

IVREFH

—1.2

ADC A current

IADCA

—25

—

ADC B current

IADCB

—25

—

Quiescent current

IADCQ

—0

µA

Uncalibrated Gain Error (ideal = 1)

EGAIN

—

+/- .004

+/- .01

—

Uncalibrated Offset Voltage

VOFFSET

—

+/- 18

+/- 46

Calibrated Absolute Error6

AECAL

—See Figure 10-21

—

LSBs

Calibration Factor 17

CF1

—

-0.003141

—

Calibration Factor 27

CF2

—

-17.6

—

Crosstalk between channels

——

-60

—

Common Mode Voltage

Vcommon

—(VREFH - VREFLO) / 2

—

Signal-to-noise ratio

SNR

—

64.6

—

Signal-to-noise plus distortion ratio

SINAD

—

59.1

—

Total Harmonic Distortion

THD

—

60.6

—

Spurious Free Dynamic Range

SFDR

—

61.1

—

Effective Number Of Bits8

ENOB

—

9.6

—

Bits

1. INL measured from Vin = .1VREFH to Vin = .9VREFH

10% to 90% Input Signal Range

2. LSB = Least Significant Bit

3. ADC clock cycles

4. Assumes each voltage reference pin is bypassed with 0.1

µF ceramic capacitors to ground

5. The current that can be injected or sourced from an unselected ADC signal input without impacting the performance of

the ADC. This allows the ADC to operate in noisy industrial environments where inductive flyback is possible.

6. Absolute error includes the effects of both gain error and offset error.

7. Please see the 56F8300 Peripheral User’s Manual for additional information on ADC calibration.

8. ENOB = (SINAD - 1.76)/6.02

Table 10-23 ADC Parameters (Continued)

Characteristic

Symbol

Min

Typ

Max

Unit

56F8335 Datasheet(PDF) 144 Page - Freescale Semiconductor, Inc

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