3

Electrical characteristics

AVCC = DVCC = + 3.3 V, Single-ended input, AGND = DGND = 0 V, fSCLK = 16 MHz, fSAMPLE = 1 Msps,

CL = 25 pF, Ta = 25 °C, unless otherwise specified.

Table 6. Electrical characteristics

Symbol

Parameters

Test conditions

Min.

Typ.

Max

Unit

Static characteristics

Resolution with no missing

codes

12

Bits

INL

Integral non-linearity (end

point method)

-1.1

±0.4

1.1

LSB

DNL

Differential non-linearity

-0.8

±0.4

0.8

LSB

OE

Offset error

-2.3

0.8

2.3

LSB

OEM

Offset error match

0.8

FSE

Full scale error

-2.3

0.8

2.3

LSB

FSEM

Full scale error match

0.8

LSB

Dynamic characteristics

SINAD

Signal-to-noise plus

distortion ratio (0 to Fs/2)

FIN = 40.2 kHz, −0.02 dBFS

68.9

72

dB

SNR

Signal-to-noise ratio

71

73

dB

(0 to Fs/2)

THD

Total harmonic distortion

−80

-73

dB

SFDR

Spurious-free dynamic

range (0 to Fs/2)

74

dB

ENOB

Effective number of bits

11.1

11.7

Bits

ISO

Channel-to-channel isolation FIN = 20 kHz, −0.02 dBFS

84

dB

IM2

2nd order intermodulation

fa = 19.5 kHz, fb = 20.5 kHz

−90

dB

VINA = VINB = -6.02 dBFS

IM3

3dr order intermodulation

fa = 19.5 kHz, fb = 20.5 kHz

−90

dB

VINA = VINB = -6.02 dBFS

Analog input characteristics

IDCL

DC leakage current

-1

1

µA

CINA

Input capacitance

Track mode

45

pF

Hold mode

4.5

pF

Digital input characteristics

VIH

Input high voltage

2.1

V

VIL

Input low voltage

0.8

V

IIN

Digital input current

VIN = 0 V or DVCC

-1

1

µA

CIND

Digital input capacitance

4.5

pF

Digital output characteristics (output coding: straight (natural) binary)

VOH(1)

Output high voltage

Isource = 1 mA

2.8

V

ADC120

Electrical characteristics

DS12987 - Rev 1

page 5/15