STA1085 datasheet(68/127 Pages) STMICROELECTRONICS

68 / 127 page

Electrical Characteristics

STA108x, STA109x

68/127

DS13319 Rev 2

4.9

ADC2: SAR ADC Electrical Characteristics

Table 31. ADC Conversion Characteristics

Symbol

Parameter

Conditions(1)

1. VDD = 3.3 V, TJ = –40 to +125 °C, unless otherwise specified and analog input voltage from VAGND to VAREF.

Min

Typ

Max

Unit

VREFE

SR External reference voltage(2)

2. VREFP <= VDDA + 25 mV.

-3.0

3.3

3.6

RREFE

S External reference input impedance



VREFI

V Internal reference voltage

1.95

2.0

2.05

tSTART

S Start-up time

From Enable to first

EOC

µs

fCK

ADC Clock frequency (depends on

system configuration)

-4

MHz

SR Sampling + conversion cycle

cycle

INL

P Integral non linearity

-2

LSB

DNL

P Differential non linearity(3)

3. No missing codes.

--1

LSB

OFS

P Offset error

-5

LSB

GNE

P Gain error

-2

LSB

TUE

P Total unadjusted error

Without current

injection

-6

LSB

IINJ

V Max positive/negative injection(4)

4. Maximum current injection without ADC performance degradation.

-–3

SNR

V Signal-to-noise ratio

THD

V Total harmonic distortion

SINAD

V Signal-to-noise and distortion

ENOB

V Effective number of bits

9.4

bits

ISAM

Average sampling current drawn from

input source

A/M

sps

Rinout

S Input impedance of each channel



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