AFS090 datasheet(138/334 Pages) MICROSEMI

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Device Architecture

2- 12 2

R e v isio n 2

Table 2-50 • ADC Characteristics in Direct Input Mode

Commercial Temperature Range Conditions, TJ = 85°C (unless noted otherwise),

Typical: VCC33A = 3.3 V, VCC = 1.5 V

Parameter

Description

Condition

Min.

Typ.

Max.

Units

Direct Input using Analog Pad AV, AC, AT

VINADC

Input Voltage (Direct Input)

Refer to Table 3-2 on

page 3-3

CINADC

Input Capacitance

Channel not selected

Channel selected but not

sampling

8pF

Channel selected and

sampling

ZINADC

Input Impedance

8-bit mode

10-bit mode

12-bit mode

Analog Reference Voltage VAREF

VAREF

Accuracy

TJ = 25°C

2.537

2.56

2.583

Temperature Drift of

Internal Reference

ppm / °C

External Reference

2.527

VCC33A + 0.05

ADC Accuracy (using external reference) 1,2

DC Accuracy

TUE

Total Unadjusted Error

8-bit mode

0.29

LSB

10-bit mode

0.72

LSB

12-bit mode

1.8

LSB

INL

Integral Non-Linearity

8-bit mode

0.20

0.25

LSB

10-bit mode

0.32

0.43

LSB

12-bit mode

1.71

1.80

LSB

DNL

Differential Non-Linearity

(no missing code)

8-bit mode

0.20

0.24

LSB

10-bit mode

0.60

0.65

LSB

12-bit mode

2.40

2.48

LSB

Offset Error

8-bit mode

0.01

0.17

LSB

10-bit mode

0.05

0.20

LSB

12-bit mode

0.20

0.40

LSB

Gain Error

8-bit mode

0.0004

0.003

LSB

10-bit mode

0.002

0.011

LSB

12-bit mode

0.007

0.044

LSB

Gain Error (with internal

reference)

All modes

% FSR

Notes:

1. Accuracy of the external reference is 2.56 V ± 4.6 mV.

2. Data is based on characterization.

3. The sample rate is time-shared among active analog inputs.

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