ADS1285 datasheet(7/67 Pages) TI

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6.5 Electrical Characteristics (continued)

minimum and maximum specifications over –40°C to +85°C; typical specifications are at 25°C; all specifications are at

AVDD1 = 5 V, AVDD2 = 2.5 V to 5 V, AVSS = 0 V, IOVDD = 1.8 V, VREFP = 4.096 V, VREFN = 0 V, VCM = 2.5 V, PGA gain = 1,

fCLK = 8.192 MHz (4.096 MHz low-power mode) and fDATA = 500 SPS (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

AC PERFORMANCE

en-MOD

Modulator voltage noise density VREF = 4.096 V

nV/√Hz

THD

Total harmonic distortion

High-power mode,

VREF = 2.5 V,

AVDD1 = 3.3 V,

AVSS = 0 V,

fIN = 31.25 Hz,

VIN = –0.5 dBFS

Buffer operation

–123

-114

PGA gain = 2

–119

PGA gain = 4

–125

-116

PGA gain = 8

–124

PGA gain = 16

–123

-116

PGA gain = 32 and 64

–125

Mid-power mode,

VREF = 2.5 V,

AVDD1 = 3.3 V,

AVSS = 0 V,

fIN = 31.25 Hz,

VIN = –0.5 dBFS

Buffer operation

–122

-113

PGA gain = 2

–120

PGA gain = 4

–125

-118

PGA gain = 8

–124

PGA gain = 16

–123

-115

PGA gain = 32 and 64

–125

Low-power mode,

VREF = 2.5 V,

AVDD1 = 3.3 V,

AVSS = 0 V,

fIN = 31.25 Hz,

VIN = –0.5 dBFS

Buffer operation

–124

-117

PGA gain = 2

–122

PGA gain = 4

–124

-116

PGA gain = 8

–125

PGA gain = 16

–123

-115

PGA gain = 32 and 64

–124

High-power mode,

VREF = 4.096 V,

AVDD1 = 5 V,

AVSS = 0 V,

fIN = 31.25 Hz,

VIN = –0.5 dBFS

Buffer operation

–119

-114

PGA gain = 1

–119

-111

PGA gain = 2

–125

PGA gain = 4

–122

-114

PGA gain = 8

–118

PGA gain = 16

–117

-111

PGA gain = 32 and 64

–125

Mid-power mode,

VREF = 4.096 V,

AVDD1 = 5 V,

AVSS = 0 V,

fIN = 31.25 Hz,

VIN = –0.5 dBFS

Buffer operation

–119

-112

PGA gain = 1

–119

-111

PGA gain = 2

–125

PGA gain = 4

–124

-115

PGA gain = 8

–119

PGA gain = 16

–117

-111

PGA gain = 32 and 64

–124

Low-power mode,

VREF = 4.096 V,

AVDD1 = 5 V,

AVSS = 0 V,

fIN = 31.25 Hz,

VIN = –0.5 dBFS

Buffer operation

–123

-117

PGA gain = 1

–121

-115

PGA gain = 2

–124

PGA gain = 4

–125

-115

PGA gain = 8

–122

PGA gain = 16

–121

-113

PGA gain = 32 and 64

–123

SFDR

Spurious-free dynamic range

fIN = 31.25 Hz, VIN = –0.5 dBFS

115

Crosstalk

fIN = 31.25 Hz, VIN = –0.5 dBFS

–140

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ADS1285

SBAS559A – MAY 2022 – REVISED DECEMBER 2022

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