ADS1220IPWR datasheet(5/71 Pages) TI1

tên linh kiện	ADS1220IPWR

Giải thích chi tiết về linh kiện	Low-Power, Low-Noise, 24-Bit, ADC for Small-Signal Sensors

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ADS1220

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SBAS501B – MAY 2013 – REVISED FEBRUARY 2015

6.3 Recommended Operating Conditions

over operating ambient temperature range (unless otherwise noted)

MIN

NOM

MAX

UNIT

POWER SUPPLY

AVDD to AVSS

2.3

5.5

V

Unipolar analog power supply

AVSS to DGND

–0.1

0

0.1

V

AVDD to DGND

2.3

2.5

2.75

V

Bipolar analog power supply

AVSS to DGND

–2.75

–2.5

–2.3

V

Digital power supply

DVDD to DGND

2.3

5.5

V

ANALOG INPUTS(1)

VIN

Differential input voltage

VIN = V(AINP) – V(AINN)

(2)

–Vref / Gain

Vref / Gain

V

PGA disabled, gain = 1 to 4

AVSS – 0.1

AVDD + 0.1

V

V(AINx)

Absolute input voltage

PGA enabled, gain = 1 to 128

See the Low-Noise PGA section

PGA disabled, gain = 1 to 4

AVSS – 0.1

AVDD + 0.1

V

VCM

Common-mode input voltage

PGA enabled, gain = 1 to 128

See the Low-Noise PGA section

VOLTAGE REFERENCE INPUTS(3)

Vref

Differential reference input voltage

Vref = V(REFPx) – V(REFNx)

0.75

2.5

AVDD

V

V(REFNx)

Absolute negative reference voltage

AVSS – 0.1

V(REFPx) – 0.75

V

V(REFPx)

Absolute positive reference voltage

V(REFNx) + 0.75

AVDD + 0.1

V

EXTERNAL CLOCK SOURCE

f(CLK)

External clock frequency

0.5

4.096

4.5

MHz

Duty cycle

40%

60%

DIGITAL INPUTS

Input voltage

DGND

DVDD

V

TEMPERATURE RANGE

TA

Operating ambient temperature

–40

125

°C

(1)

AINP and AINN denote the positive and negative inputs of the PGA. AINx denotes one of the four available analog inputs.

PGA disabled means the low-noise PGA is powered down and bypassed. Gains of 1, 2, and 4 are still possible in this case.

See the Bypassing the PGA section for more information.

(2)

Excluding the effects of offset and gain error.

Limited to ±[(AVDD – AVSS) – 0.4 V] / Gain, when the PGA is enabled.

(3)

REFPx and REFNx denote one of two available differential reference input pairs.

6.4 Thermal Information

ADS1220

THERMAL METRIC(1)

VQFN (RVA)

TSSOP (PW)

UNIT

16 PINS

RθJA

Junction-to-ambient thermal resistance

43.4

99.5

RθJC(top)

Junction-to-case (top) thermal resistance

47.3

35.2

RθJB

Junction-to-board thermal resistance

18.4

44.3

°C/W

ψJT

Junction-to-top characterization parameter

0.6

2.4

ψJB

Junction-to-board characterization parameter

18.4

43.8

RθJC(bot)

Junction-to-case (bottom) thermal resistance

2.0

n/a

(1)

For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

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