STA1295 datasheet(91/109 Pages) STMICROELECTRONICS

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DS12586 Rev 5

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STA1295, STA1275

Electrical characteristics

106

4.10

ADC2 and ADC3: SAR ADCs electrical characteristics

The SAR ADC is a successive approximation 10 bit Analog-to-Digital converter. Its

characteristics are reported in the table below.

Table 46. 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

Integral non linearity

—

-2

—

LSB

DNL

Differential non linearity(3)

3. No missing codes.

—-1

—

LSB

OFS

Offset error

—

-5

—

LSB

GNE

Gain error

—

-2

—

LSB

TUE

Total unadjusted error

Without current

injection

-6

—

LSB

IINJ

Max positive/negative injection(4)

4. Maximum current injection without ADC performance degradation.

—–3

—

SNR

Signal-to-noise ratio

—

THD

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

——

—

μA/M

sps

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